CN104677978B - Method for indicating ore-forming fluid contribution ratio of magma fluid and seawater in formation of vms (volatile media) type ore deposit - Google Patents
Method for indicating ore-forming fluid contribution ratio of magma fluid and seawater in formation of vms (volatile media) type ore deposit Download PDFInfo
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Abstract
The invention provides a method for indicating the ratio of ore-forming fluid contributions of magma fluid and seawater in the formation of a vms (v) type deposit, which comprises 1) measuring lithium isotopes in quartz, and obtaining an empirical formula of △ linear equation7LiQuartz‑fluid-8.9382 × (1000/T) +22.22, coefficient of linear correlation R2Calculating lithium isotope in the fluid inclusion water as 0.98; 3) measuring oxygen isotopes in the fluid inclusions; taking lithium isotope in the fluid inclusion as a vertical coordinate; the oxygen isotope in the fluid inclusion is the abscissa, CLithium rock slurry water/CLithium seawater: 0.05, 0.2, 0.5, 1.5, 5.0, 30.0 to obtain 6 fitting curves; 6) and calculating the contribution ratio of the ore-forming fluid in the formation of the vms-type deposit by the magma fluid and the seawater according to a formula.
Description
Technical field
The present invention relates to VMS types mineral deposit research field, further says, it is to be related to one kind to indicate that Magmatic Fluid and sea water exist
The method of BIFhosted gold deposit contribution proportion in vms type formation of ore deposits.
Background technology
For VMS types mineral deposit, most scholars think that BIFhosted gold deposit occurs the sea water of convection circulation from by magma heating
(Pisutha-Arnond and Ohmoto, 1983；Date et al., 1983；Green et al., 1983；David et
Al., 1995).However, close symbiosiss based on sulfide deposit and calc-alkali rock series (Urabe, 1987；Stanton,
1990；Hou et al., 2001), the high Salinity Characteristics of fluid inclusion (Lecuyer et al., 1999；Hou et al.,
2001), the fluid of metallic element-(Urabe, 1985), some scholars insist BIFhosted gold deposit from rock for molten slurry distribution experiment
Slurry degassing, Ore forming metals are from Magma Systems.In recent years, hydrogen-oxygen Carbon Isotopic Evidence (Jorge et al., 2006；
Beaudoin et al.2014) support magma addition is leading Hydrothermal System with sea water.Yang et al. (1996) leads to
Cross to melt inclusion component analyses in the amp- rhyolite of submarine hydrothermal activity area cellular English, it was demonstrated that magma degassing process is really
The hydrothermal solution containing metal can be excreted, but which occupies many vast scales in BIFhosted gold deposit, be produced in mineralizing process on earth much
Contribution, it is unclear.Hou Zengqian etc. (Hou et al., 2001；Hou Zengqian etc., 2003) systematic study Liao Xia villages mineral deposit fluid bag
Body and Oxygen Isotopic Study are wrapped up in, the presence for thinking to have magmatic water is also tended to.However, magmatic water is to submarine hydrothermal fluid Fluid Ore Forming system
System produces great contribution actuallyMagmatic water mixes the detailed process for developing into BIFhosted gold deposit with sea waterFluid-mixing pair
What control mineralizing process hasBeing still needs technical problem urgently to be resolved hurrily at present.
The content of the invention
To solve problem of the prior art, the invention provides a kind of indicate Magmatic Fluid and sea water in vms types mineral deposit shape
Into the method for middle BIFhosted gold deposit contribution proportion.Can indicate that Magmatic Fluid and sea water in vms type ore deposits by the method for the present invention
BIFhosted gold deposit contribution proportion in bed formation.For the research of vms type formation of ore deposits is of great importance.
It is an object of the invention to provide a kind of indicate the BIFhosted gold deposit contribution in vms type formation of ore deposits of Magmatic Fluid and sea water
The method of ratio.
Including:
1) quartz in lithium isotope measure；
Quartz specimen is dissolved Jing after surface cleaning, fluid inclusion extraction, supersound extraction, carries out the measure of lithium isotope；
In the present invention, in quartz, lithium isotope measuring method can adopt the measurement side of common lithium isotope in prior art
The surface cleaning of method, such as quartz specimen, the extraction of fluid inclusion water, dissolving method of quartz specimen etc. can adopt prior art
In conventional method, the present invention in, preferably carry out according to the following steps：
A. sample surfaces purification
Appropriate chloroazotic acid is added to be positioned over 120 DEG C in heating plate in Pure quartz sample of the purity of select more than 99%
Insulation 3 hours, inclines and residual acid clean with ultra-pure water, is washed till that cleaning mixture conductance is consistent with ultra-pure water conductance, and ultra-pure water soaks
Overnight.Incline soak, adds ultra-pure water, is cleaned by ultrasonic sample several minutes with ultrasonic cleaner, sucking filtration immediately, and with ultrapure
For several times, sample is placed in porcelain dish water washing, dries in 100 DEG C.
B. sample size
Volcanogenic massive sulfide deposit (VMS types mineral deposit) the quartz specimen requirement of Submarine Exhalative-formation of deposits is
3g, the lithium content in quartz can meet test needs.
C. polishing opens fluid inclusion
Load weighted sample is ground to more than 200 mesh, now it is considered that fluid inclusion is all grated.
D. extraction time
By above-mentioned ground sample ultra-pure water ultrasonic washing sucking filtration sample 5 times, more completely can carry
Take fluid inclusion liquid phase.Quartz specimen after extraction is placed in porcelain dish, is dried in 80 DEG C.
E. sample dissolving
The sample of above-mentioned drying is added into HNO3The molten sample of the first step is carried out with HF, about 1g samples add 0.5mL
HNO3+ 5mL HF, are initially charged HNO during molten sample3, HF is added afterwards.Remaining molten sample step it is consistent with universal method (Rudnick, 2004；
Tian et.al.2012)。
1. 1g samples add 0.5mL HNO3+ 5mL HF, are initially charged HNO during molten sample3, HF is added afterwards；2. bottle cap is tightened,
Shake 10 minutes in ultrasound wave, be placed in heater plate 24 hours (temperature is 120 DEG C)；3. solution is evaporated, is added a certain amount of
Dense HNO32-4 time, it is evaporated every time；4. dense HCl is added in the sample, is heated under the conditions of 120 DEG C, until solution is completely molten
Solution；5. sample is evaporated, 1.2mL4M HCl are added, it is standby.
F. purification
As the lithium content and Main elements content of fluid inclusions in quartz and quartz itself are all far smaller than several worlds
Standard sample, therefore, chemical purification method and universal method (Rudnick, 2004；Tian et.al.2012) it is consistent, you can with
Meet purification requirements, after purification sample carry out MC-ICP-MS test be obtained fluid inclusions in quartz and quartz in lithium it is same
The plain ratio in position.Universal method refers to the conventional method of prior art, as described below：
1. exchange column 1
Exchange column 1 is the polypropylene exchange column for being filled with 1.2mL cation exchange resiies (AG50W-X8).Leacheate is
2.8M HCl.1mL 4M HCl balance pillars are firstly added, (molten sample process final sample adds 1.2mL then to take 1mL samples
4M HCl, take 1mL after centrifugation) exchange column 1 is added, then 5mL leacheates are added one by one.Collect what is added above with Teflon beakers
1mL samples and 5mL leacheates.It is evaporated on electric hot plate (100～120 DEG C), adds 2mL 0.15M HCl standby.This exchange column
Rare earth element can be completely separated, while Main elements (being primarily referred to as Na, K, Ca, Fe, Mg) can be separated roughly.
2. exchange column 2
Exchange column 2 is the polypropylene exchange column for being filled with 1.5mL cation exchange resiies (AG50W-X8).Leacheate is
0.15M HCl.2mL is added into exchange column 2 through the working solution of previous step, 21mL leacheates is subsequently adding, is used
Teflon beakers are collected and (are noted：Sample solution is not collected, leacheate is only collected).The heating on electric hot plate is evaporated (100～120
DEG C), add 1mL 0.15M HCl standby.Li and Na is separated by this exchange column with other Main elements.
3. exchange column 3
Exchange column 3 is the quartzy exchange column for being filled with 1mL cation exchange resiies (AG50W-X8).Leacheate is 0.5M
HCl 30%C2H5OH.1mL is added into exchange column 3 through the working solution of previous step, 9mL leacheates are subsequently adding, and
It is collected with Teflon beakers, heats on electric hot plate and be evaporated (100～120 DEG C).For separating effect more preferably, exchange column 3
Typically wanted twice.This exchange column can separate Li and Na.
Mass spectrometric measurement
1.2mL 2%HNO will be added through the sample being evaporated after purification3, it is ready for mass spectrometric measurement.
Tested using Thermo Finnigan Neptune types MC-ICP-MS,7Li and6Li is contrary using two
Faraday cup is measured simultaneously, and the former is located at high-quality Faraday cup (H4), and the latter is positioned at low quality Faraday cup (L4), and (marquis can
Army, 2007；2008；2010).Instrument working parameter：RF power 1200W, cool down gas about 15L/min, aid in gas about 0.6L/min,
Carrier gas about 1.15L/min, nebulizer type be Menhard nebulizers (50 μ L/min), analyzer vacuum 4 × 10-9～8 × 10- 9Pa (Hou Kejun, 2007；2008；2010).For accurate test, it is substantially stabilized that instrument needs preheating to can be only achieved for 1～2 hour.
When test starts, half vector quantization test is first carried out to Na/Li, if Na/Li>20 need to be crossed exchange column again to sample
3, further separate Na.For lithium isotope, by the mass fractionation of plasma source generation up to 25%, but the test stream of interior extrapolation method
Journey, which can be corrected (Millot, 2004；Hou Kejun, 2008), specially：Standard specimen → blank → sample → blank →
Standard specimen.Test result is expressed as：δ7Li=[(RSP/RST) -1] × 1,000 ‰, wherein RSPFor sample7Li/6The measure of Li ratios
Value, RSTIt is the twice standard specimen adjacent with sample7Li/6The meansigma methodss of Li ratio measurements.Isotopic standard material used is L-SVEC
Or IRMM-016.20 data of per group of collection during sample test, gather 2～4 groups of data altogether,7Li/6Li uncertainties of measurement≤
±0.2‰(2σ).Between testing twice, with 2% and 5% HNO3Replace purging system.
Obtain lithium isotope ratio in quartz.
2) empirically formula：Linear equation is △ δ7LiQuartz-fluid=-8.9382 × (1000/T)+22.22, linearly
Coefficient R2=0.98 calculates lithium isotope ratio in fluid inclusion water；
T be fluid inclusions homogenization temperature K, T=t+273.15K, 150 DEG C≤t≤340 DEG C, preferably 175 DEG C≤t≤340
℃。
3) measure of oxygen isotope；
Using BrF5Analysis method measures the oxygen isotope ratio in fluid inclusion；
Oxygen isotope analysis are completed in Isotope Geology key lab of Ministry of Land and Resources, using traditional BrF5Analysis
(Clayton et al., 1963), use BrF to method5Extraction mineral oxygen is reacted under vacuum and hot conditionss with oxidiferous mineral, and
With scorching hot resistance --- graphite rod burning conversion is into CO2Gas, analysis precision are ± 0.2 ‰, and relative standard is V-SMOW, are owned
Instrument is MAT-253EM type mass spectrographs.δ18OV-SMOW=[(18O/16O)sample/(18O/18O)V-SMOW-1]×1000；Quartz：
103lnαQuartz-water=3.34 × 106/T2- 3.31 (Matsuhisa et al., 1979), αQuartz-water=δ18OQuartz-δ18O fluid。
4) with lithium isotope ratio in fluid inclusion as vertical coordinate；In fluid inclusion, oxygen isotope ratio is horizontal seat
Mark, CLithium magmatic water/CLithium sea water：0.05th, 0.2,0.5,1.5,5.0,30.0 obtain 6 matched curve figures (shown in Fig. 1)；
CLithium sea water：The concentration of lithium in sea water；CLithium magmatic water：The concentration of lithium in magmatic water；
By oxygen isotope ratio in lithium isotope ratio, fluid inclusion in the fluid inclusion for measuring, obtain in figure
CLithium magmatic water/CLithium sea waterRatio；
5) X is calculated by formulaSea waterAnd XMagmatic water；
δ7Li=(δ7LiSea waterCLithium sea waterXSea water+δ7LiMagmatic waterCLithium magmatic waterXMagmatic water)/(CLithium sea waterXSea water+CLithium magmatic waterXMagmatic water)
δ18O=(δ18OSea waterCOxygen sea waterXSea water+δ18OMagmatic waterCOxygen magmatic waterXMagmatic water)/(COxygen sea waterXSea water+COxygen magmatic waterXMagmatic water)
δ7LiSea water：The lithium isotope ratio of sea water, 31.5 ‰；
δ7LiMagmatic water：The lithium isotope ratio of magmatic water；
CLithium sea water：The concentration of lithium, 0.18ppm in sea water；
CLithium magmatic water：The concentration of lithium in magmatic water；
XSea water：Participate in the percent shared by the sea water in Hydrothermal System；
XMagmatic water：Participate in the percent shared by the magmatic water in Hydrothermal System, XMagmatic water=1-XSea water；
δ18O：Oxygen isotope ratio in fluid inclusion；δ7Li：Lithium isotope ratio in fluid inclusion
δ18OSea water：The oxygen isotope ratio of sea water, 0 ‰；
δ18OMagmatic water：The oxygen isotope ratio of magmatic water, meansigma methodss 8.0 ‰ in magmatic water；
COxygen sea water：The concentration of extra large water oxygen, 88.9%；
COxygen magmatic water：The concentration of magma water oxygen.
Wherein, preferably：
Pure quartz sample of the quartz specimen for purity more than 98%, granularity 60-80 mesh.
In step (1), fluid inclusion is extracted using polishing.
In step (1), the number of times of supersound extraction is more than or equal to 5 times.
In step (1), quartz specimen is initially charged HNO3, HF dissolvings are added afterwards.Dissolving 1g quartz HF consumption more than etc.
In 5ml.Add HNO3Can be adjusted according to practical situation with the amount of HF, be advisable with abundant dissolving.In the present invention, can be excellent
Choosing：1g quartz specimen needs 0.5mL HNO3And 5mLHF.
The BIFhosted gold deposit contribution in vms type formation of ore deposits of Magmatic Fluid and sea water can indicate that by the method for the present invention
Ratio.For the research of vms type formation of ore deposits is of great importance.
Description of the drawings
Fig. 1 is with lithium isotope ratio in fluid inclusion as vertical coordinate；In fluid inclusion, oxygen isotope ratio is horizontal seat
Mark, CLithium magmatic water/CLithium sea water：0.05th, 0.2,0.5,1.5,5.0,30.0 obtain 6 matched curve figures.
The matched curve figure of Fig. 2 embodiments 1～6.
Specific embodiment
With reference to embodiment, the present invention is further illustrated.
Instrument
Lithium isotope constitutes test analysis and receives the Neptune types of Isotope Geology key lab of Ministry of Land and Resources more
Complete on plasma mass spectrograph (MC-ICP-MS).9 Faraday cups of the instrument configuration and 5 ion counters.8 farads
The glass is configured in centerpiece both sides, and being driven with motor carries out accurate position adjustments；One electron multiplier is housed after centerpiece,
Minimum quality number glass outside is equipped with 4 ion counters.MC-ICP-MS is double focusing (Voice segment and quality are focused on) type mass spectrum
Mass dispersion, using dynamic zoom (ZOOM) patented technology, can be extended to 17% by instrument.Produce into the said firm after sample atomization
Stable sampling system (stable introduction system, SIS), this stable sampling system is cyclone and Si Kete
The combination of nebulizer, can provide more stable signal and shorten scavenging period[46]。
Labware and main agents
The pre-treatment of sample is operated in the Superclean Lab of isotope key lab of Ministry of Land and Resources and completes, indoor clean
It is hundred grades in thousand grades, superclean bench that cleanliness is.
In experiment flow, vessel used are polypropylene or polytetrafluoroethylmaterial material, using strict cleaning process, to drop
The background of low vessel：It is first to wash --- top pure grade HNO3(7mol/L) soak --- ultra-pure water cleaning, immersion --- top pure grade
Dry for standby that HCl (6mol/L) soaks --- ultra-pure water cleaning, immersion ---.
Ultra-pure water used by experiment is obtained by Millipure purification, and resistivity is 18.2M Ω cm.Main chemical reagent
There are HCl, HNO3, HF and dehydrated alcohol, wherein HCl, HNO3, HF it is sub- through Savillex DST-1000 by the pure acid of MOS levels
Obtained by boiling Distallation systm second distillation；Ethanol is MOS level pure reagents, and concentration is 99.9%.
Laboratory sample
In the experiment that sample size size is affected on lithium isotope measured value, from international conventional lithium standard substance IRMM-
016 is purchased from US Geological Survey.
Testing procedure：
1) quartz in lithium isotope measure
A sample surfaces are purified
Appropriate chloroazotic acid is added to be positioned over 120 DEG C in heating plate in Pure quartz sample of the purity of select more than 99%
Insulation 3 hours, inclines and residual acid clean with ultra-pure water, is washed till that cleaning mixture conductance is consistent with ultra-pure water conductance, and ultra-pure water soaks
Overnight.Incline soak, adds ultra-pure water, is cleaned by ultrasonic sample several minutes with ultrasonic cleaner, sucking filtration immediately, and with ultrapure
For several times, sample is placed in porcelain dish water washing, dries in 100 DEG C.
B sample sizes
Volcanogenic massive sulfide deposit (VMS types mineral deposit) the quartz specimen requirement of Submarine Exhalative-formation of deposits is
3g, the lithium content in quartz can meet test needs.
C. polishing opens fluid inclusion
Load weighted sample is ground to more than 200 mesh, now it is considered that fluid inclusion is all grated.
D. extraction time
By above-mentioned ground sample ultra-pure water ultrasonic washing sucking filtration sample 5 times, more completely can carry
Take fluid inclusion liquid phase.Quartz specimen after extraction is placed in porcelain dish, is dried in 80 DEG C.
E. sample dissolving
The sample of above-mentioned drying is added into HNO3The molten sample of the first step is carried out with HF, about 1g samples add 0.5mL
HNO3+ 5mL HF, are initially charged HNO during molten sample3, HF is added afterwards.Remaining molten sample step and universal method (Rudnick, 2004；Tian
Et.al.2012 it is) consistent.
F. purification
1. exchange column 1
Exchange column 1 is the polypropylene exchange column for being filled with 1.2mL cation exchange resiies (AG50W-X8).Leacheate is
2.8M HCl.1mL 4M HCl balance pillars are firstly added, (molten sample process final sample adds 1.2mL then to take 1mL samples
4M HCl, take 1mL after centrifugation) exchange column 1 is added, then 5mL leacheates are added one by one.Collect what is added above with Teflon beakers
1mL samples and 5mL leacheates.It is evaporated on electric hot plate (100～120 DEG C), adds 2mL 0.15M HCl standby.This exchange column
Rare earth element can be completely separated, while Main elements (being primarily referred to as Na, K, Ca, Fe, Mg) can be separated roughly.
2. exchange column 2
Exchange column 2 is the polypropylene exchange column for being filled with 1.5mL cation exchange resiies (AG50W-X8).Leacheate is
0.15M HCl.2mL is added into exchange column 2 through the working solution of previous step, 21mL leacheates is subsequently adding, is used
Teflon beakers are collected and (are noted：Sample solution is not collected, leacheate is only collected).The heating on electric hot plate is evaporated (100～120
DEG C), add 1mL 0.15M HCl standby.Li and Na is separated by this exchange column with other Main elements.
3. exchange column 3
Exchange column 3 is the quartzy exchange column for being filled with 1mL cation exchange resiies (AG50W-X8).Leacheate is 0.5M
HCl 30%C2H5OH.1mL is added into exchange column 3 through the working solution of previous step, 9mL leacheates are subsequently adding, and
It is collected with Teflon beakers, heats on electric hot plate and be evaporated (100～120 DEG C).For separating effect more preferably, exchange column 3
Typically wanted twice.This exchange column can separate Li and Na.
Mass spectrometric measurement
1.2mL 2%HNO will be added through the sample being evaporated after purification3, it is ready for mass spectrometric measurement.
Tested using Thermo Finnigan Neptune types MC-ICP-MS,7Li and6Li is contrary using two
Faraday cup is measured simultaneously, and the former is located at high-quality Faraday cup (H4), and the latter is positioned at low quality Faraday cup (L4), and (marquis can
Army, 2007；2008；2010).Instrument working parameter：RF power 1200W, cool down gas about 15L/min, aid in gas about 0.6L/min,
Carrier gas about 1.15L/min, nebulizer type be Menhard nebulizers (50 μ L/min), analyzer vacuum 4 × 10-9～8 × 10- 9Pa (Hou Kejun, 2007；2008；2010).For accurate test, it is substantially stabilized that instrument needs preheating to can be only achieved for 1～2 hour.
When test starts, half vector quantization test is first carried out to Na/Li, if Na/Li>20 need to be crossed exchange column again to sample
3, further separate Na.For lithium isotope, by the mass fractionation of plasma source generation up to 25%, but the test stream of interior extrapolation method
Journey, which can be corrected (Millot, 2004；Hou Kejun, 2008), specially：Standard specimen → blank → sample → blank →
Standard specimen.Test result is expressed as：δ7Li=[(RSP/RST) -1] × 1,000 ‰, wherein RSPFor sample7Li/6The measure of Li ratios
Value, RSTIt is the twice standard specimen adjacent with sample7Li/6The meansigma methodss of Li ratio measurements.Isotopic standard material used is L-SVEC
Or IRMM-016.20 data of per group of collection during sample test, gather 2～4 groups of data altogether,7Li/6Li uncertainties of measurement≤
±0.2‰(2σ).Between testing twice, with 2% and 5% HNO3Replace purging system.
Obtain lithium isotope ratio in quartz.
2) measurement result according to lithium isotope in quartz, according to the empirical equation of the present invention, you can calculate fluid bag
Wrap up in lithium isotope ratio in body；
3) measure of oxygen isotope；
Using BrF5Analysis method measures the oxygen isotope ratio in fluid inclusion；
Use BrF5With oxidiferous mineral react under vacuum and hot conditionss extraction mineral oxygen, and with scorching hot resistance --- graphite
Rod burning conversion is into CO2Gas, analysis precision are ± 0.2 ‰, and relative standard is V-SMOW, and all appts are MAT-253EM types
Mass spectrograph.δ18OV-SMOW=[(18O/16O)sample/(18O/18O)V-SMOW-1]×1000；Quartz：103lnαQuartz-water=3.34 ×
106/T2- 3.31 (Matsuhisa et al., 1979), αQuartz-water=δ18OQuartz-δ18O fluid。
4) with lithium isotope ratio in fluid inclusion as vertical coordinate；In fluid inclusion, oxygen isotope ratio is horizontal seat
Mark, CLithium magmatic water/CLithium sea water：0.05th, 0.2,0.5,1.5,5.0,30.0 obtain 6 matched curve figures；
5) X is calculated by formulaSea waterAnd XMagmatic water；
δ7Li=(δ7LiSea waterCLithium sea waterXSea water+δ7LiMagmatic waterCLithium magmatic waterXMagmatic water)/(CLithium sea waterXSea water+CLithium magmatic waterXMagmatic water)
δ18O=(δ18OSea waterCOxygen sea waterXSea water+δ18OMagmatic waterCOxygen magmatic waterXMagmatic water)/(COxygen sea waterXSea water+COxygen magmatic waterXMagmatic water)
Embodiment 1～6
Data are shown in Table 1. Fig. 2.
In Fig. 2, embodiment 1：Square；Embodiment 2：It is circular；Embodiment 3：Triangle；
Embodiment 4：Star；Embodiment 5：Pentagon.
Table 1
The several data obtained by said method reflect the participation amount of sea water when they form, such as embodiment well
1 is located at mineral deposit bottommost XSea water=0.6%, almost no sea water participate in being formed, it is magmatic water which forms fluid almost all.It is real
Apply example 2 and embodiment 3 is located at LSO, XSea waterFor 3.2% and 0%, sea water participates in little.Embodiment 4 and embodiment 5 are located in ore body
The lateral location of the MSO in portion, XSea waterFor 34.2% and 46.6%, in BIFhosted gold deposit, sea water contribute to nearly half.Illustrate in Cheng Kuang
Early stage seabed hypomagma water is BIFhosted gold deposit main source, forms two side position of ore body sea when ore deposit mid-term net vein orebody is formed
Water participation increases, intimate half contribution.
Claims (6)
1. a kind of method for indicating the Magmatic Fluid and sea water BIFhosted gold deposit contribution proportion in vms type formation of ore deposits, its feature exists
Include in methods described:
1) quartz in lithium isotope measure；
Quartz specimen Jing surface cleaning, fluid inclusion opening, supersound extraction, quartz powder dissolving, Sample Purification on Single carry out quartz
The measure of lithium isotope；
2) empirically formula：Linear equation is △ δ7LiQuartz-fluid=-8.9382 × (1000/T)+22.22, linear correlation
Coefficients R2=0.98 calculates lithium isotope ratio in fluid inclusion water；
T is fluid inclusions homogenization temperature K, T=t+273.15K, 150 DEG C≤t≤340 DEG C；
3) measure of oxygen isotope；
Using BrF5Analysis method measures the oxygen isotope ratio in quartz, and passes through 103lnαQuartz-water=3.34 × 106/T2-
3.31；αQuartz-water=δ18OMineral-δ18OFluid, it is calculated fluid inclusion water oxygen isotopic ratio；
4) with lithium isotope ratio in fluid inclusion as vertical coordinate；In fluid inclusion, oxygen isotope ratio is abscissa,
CLithium magmatic water/CLithium sea water：0.05th, 0.2,0.5,1.5,5.0,30.0 obtain 6 matched curve figures；
CLithium sea water：The concentration of lithium in sea water；CLithium magmatic water：The concentration of lithium in magmatic water；
By oxygen isotope ratio in lithium isotope ratio, fluid inclusion in the fluid inclusion for measuring, calculate and obtain
CLithium magmatic water/CLithium sea waterRatio；
5) X is calculated by formulaSea waterAnd XMagmatic water；
δ7Li=(δ7LiSea waterCLithium sea waterXSea water+δ7LiMagmatic waterCLithium magmatic waterXMagmatic water)/(CLithium sea waterXSea water+CLithium magmatic waterXMagmatic water)
δ18O=(δ18OSea waterCOxygen sea waterXSea water+δ18OMagmatic waterCOxygen magmatic waterXMagmatic water)/(COxygen sea waterXSea water+COxygen magmatic waterXMagmatic water)
δ7LiSea water：The lithium isotope ratio of sea water, 31.5 ‰；
δ7LiMagmatic water：The lithium isotope ratio of magmatic water；
CLithium sea water：The concentration of lithium, 0.18ppm in sea water；
CLithium magmatic water：The concentration of lithium in magmatic water；
XSea water：Participate in the percent shared by the sea water in Hydrothermal System；
XMagmatic water：Participate in the percent shared by the magmatic water in Hydrothermal System, XMagmatic water=1-XSea water；
δ18O：Oxygen isotope ratio in fluid inclusion；δ7Li：Lithium isotope ratio in fluid inclusion；
δ18OSea water：The oxygen isotope ratio of sea water, 0 ‰；
δ18OMagmatic water：The oxygen isotope ratio of magmatic water, meansigma methodss 8.0 ‰ in magmatic water；
COxygen sea water：The concentration of extra large water oxygen, 88.9%；
COxygen magmatic water：The concentration of magma water oxygen.
2. it is as claimed in claim 1 to indicate the Magmatic Fluid and sea water BIFhosted gold deposit contribution proportion in vms type formation of ore deposits
Method, it is characterised in that：
Pure quartz sample of the quartz specimen for purity more than 98%, granularity 60-80 mesh.
3. it is as claimed in claim 1 to indicate the Magmatic Fluid and sea water BIFhosted gold deposit contribution proportion in vms type formation of ore deposits
Method, it is characterised in that：
In step (1), fluid inclusion is opened using polishing.
4. it is as claimed in claim 1 to indicate the Magmatic Fluid and sea water BIFhosted gold deposit contribution proportion in vms type formation of ore deposits
Method, it is characterised in that：
In step (1), the number of times of supersound extraction is more than or equal to 5 times.
5. it is as claimed in claim 1 to indicate the Magmatic Fluid and sea water BIFhosted gold deposit contribution proportion in vms type formation of ore deposits
Method, it is characterised in that：
In step (1), quartz specimen is initially charged HNO3, HF dissolvings are added afterwards.
6. it is as claimed in claim 5 to indicate the Magmatic Fluid and sea water BIFhosted gold deposit contribution proportion in vms type formation of ore deposits
Method, it is characterised in that：
The consumption of the HF of dissolving 1g quartz is more than or equal to 5ml.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510093317.9A CN104677978B (en) | 2015-03-02 | 2015-03-02 | Method for indicating ore-forming fluid contribution ratio of magma fluid and seawater in formation of vms (volatile media) type ore deposit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510093317.9A CN104677978B (en) | 2015-03-02 | 2015-03-02 | Method for indicating ore-forming fluid contribution ratio of magma fluid and seawater in formation of vms (volatile media) type ore deposit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104677978A CN104677978A (en) | 2015-06-03 |
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