Re–Os dating of molybdenite and in-situ Pb isotopes of sulfides from the Lamo Zn–Cu deposit in the Dachang tin-polymetallic ore field,Guangxi,China

Hai Zhao•Wenchao Su•Peng Xie•Nengping Shen•Jiali Cai•Ming Luo•Jie Li•Zhian Bao

1 Introduction

The Dachang tin-polymetallic district,Guangxi,China,is one of the largest tin ore fields in the world and contains approximately 1.5 Mt Sn,6.8 Mt Zn,1.8 Mt Pb,1.4 Mt Sb,0.4 Mt Cu,and other metals(Huang et al.2012).Economic deposits in the district include the Lamo proximal skarn Zn–Cu deposit,the Tongkeng-Changpo and Gaofeng tinbase metal deposits,and the Huile and Dafulou black shale-hosted cassiterite-sulfide deposits.They occur as stratiforms,veins,and stockworks that are hosted in the Mid-Upper Devonian carbonate-rich sediments adjacent to the underlying Cretaceous Longxianggai granite.

In the past decades,there were a large number of studies on the geology,mineralogy,geochemistry,isotopes,chronology,and fluid inclusions for the Dachang ore district(Chen et al.1985,1993;Han and Hutchinson 1989a,b;Fu et al.1991,1993;Zhao et al.2002,2007;Pašava et al.2003;Cai et al.2004,2005,2006a,b;Fan et al.2004;Wang et al.2004,2015;Li et al.2008;Liang et al.2011a,b;Xu et al.2011),but the origin of the deposits remains controversial.Most studies concluded that all of depositsin the Dachang district were formed in a magmatic hydrothermal system related to the Longxianggai granite(Chen et al.1993;Fu et al.1991,1993;Cai et al.2005,2007;Liet al.2008),based on similar age ranges for mineralization(91–96 Ma)and for the granite(91–97 Ma)(Wang et al.2004,2015;Caiet al.2006a,b,2011a,b;Guo et al.2017).Others argued that some ores,especially the stratiform ores,were the results of submarine exhalations during the Devonian(Cai and Zhang 1983;Han and Hutchinson 1989a,b,1997;Jiang et al.1999;Zhao et al.2007).These debates may be attributed to the lack of convincing chronological data,especially the lack of direct dating on sulfides,as this data were determined by different isotopic dating methods.

Re–Osisotopesystem is widely used for direct dating of sulfides for the deposits because some sulfides contain detectable Re and Os concentrations.Many studies have shown that molybdenite(MoS2)is the most suitable sulfide for the direct dating of mineralization,owing to its high concentration of Re(up to hundreds or thousands of parts per million)but lack of common Os(Luck and Allegre 1982;Selby and Creaser 2001;Stein et al.2001).Recent mining reveals that molybdenite occurs locally in the skarns associated with Zn–Cu mineralization at the Lamo deposit in the Dachang ore field.This provides a good opportunity to directly date Zn–Cu mineralization.In this paper,we are the first to report a precise age for Zn–Cu mineralization in the Dachang district,using the molybdenite Re–Os dating method.Combined with in-situ Pb isotope of sulfides from the Lamo deposit and feldspars in the biotite granite and granitic porphyry dikes in the district,the sources of metals for the Lamo deposit are also discussed.

2 Geological setting

The Dachang tin-polymetallic ore field(Fig.1)is located in the central part of the Danchifold belt,at the intersection between the Jiangnan geoanticline and the Tiengui geosyncline(Cai et al.2007).Sedimentary rocks in this area consist of Devonian siltstone,black shale,lenticular and reef limestone,Carboniferous limestone and siltstone,and Permian sandstone.These rocks are exposed along the axis of the NW-trending Longxianggai anticline and are cut by the Longxiangai reverse fault on the west flank,where the Longxianggai granite intruded.A series of the NE-trending normal faults cut the anticline and the reverse fault.In addition,there is a small anticline that developed in the southwestern part of the district.The axis of the Dachang anticline is parallel to the main fold and is cut by the Dachang reverse fault,where the granite porphyry dikes intruded.

The Longxianggai granite is the main intrusive body in the Dachang area.It crops out at the center part of the Dachang ore field,with an areaof 0.5 km2,near theaxisof the Longxianggai anticline(Fig.1).It contains quartz(36%),K-feldspar(38%),plagioclase(22%),muscovite(3%),and biotite(1%),with accessory ilmenite,zircon and monazite(Fu et al.1991).The granite and its porphyritic phase have been dated by the SHRIMPzircon U–Pb dating at 93±1 and 91±1 Ma,respectively(Cai et al.2006a).However,Liang et al.(2011a,b)reported slightly older ages for the granite,ranging from 94±1 to 97±3 Ma,and these ages were measured by the LA-MC-ICP-MS zircon U–Pb dating method.

Mineralization in the Dachang ore field exhibitsobvious metal zoning,both vertical and horizontal,around the Longxiangai granite pluton.The Lamo Zn–Cu skarn deposit occurs in the contact areas between the Upper Devonian limestone and the granite,whereas the cassiterite-sulfide ores are mainly distributed distal to the granite,such as the Changpo-Tongkeng and Gaofeng deposits in the western part,and the Dafulou,Huile and Kangma deposits in the eastern part.

3 Geology of deposit

The Lamo Zn–Cu deposit(Fig.2)is a typical skarn deposit in the Dachang ore field and has many characteristics of proximal calcic skarns(Kwak 1987).It contains approximately 0.6 Mt Zn with an average grade of 4%Zn,0.034 Mt Cu with an average grade of 0.6%Cu,and other metals(Ye and Pan 1994).The geology of the deposit was described in detail by Fu et al.(1991).

Sedimentary rocks in the Lamo district consist of marl and shale of the Middle Devonian Luofu Formation,siliceous rocks of the Upper Devonian Liujiang Formation,lenticular and banded limestone of the Upper Devonian Wuzhishan Formation,and marl,mudstoneand shaleof the Lower Carboniferous Luzhai Formation.Zn–Cu ores are hosted in the contact zone between the lenticular and banded limestone of the Upper Devonian Wuzhishan Formation and the granite.The limestone within 1–1.5 km of the granite contact had been metamorphosed to marble,hornfels,and metamorphic skarns(Fu et al.1991).

The orebodies at the Lamo occur as chimney,mantos,and pods(Fu et al.1991).Ore minerals mainly consist of sphalerite,arsenopyrite,pyrrhotite,galena,chalcopyrite,and minor molybdenite and scheelite.Based on field observation, crosscutting relations and mineral assemblages,four mineral stagesfor the Lamo deposit have been identified(Fig.3).

Fig.1 Geological map of the Dachang ore field(modified from Chen et al.1993)

Fig.2 Geological map(a)and cross-section map(b)of the Lamo Zn–Cu deposit(modified from Chen et al.1993)

Stage I and II are skarn assemblages,which occur only near the granite contact.Stage I is a dry skarn stage and consists of garnet,vesuvianite,and wollastonite,with minor diopside.The garnet is usually light brown in color(Fig.4a–e)and composed 60%to 70%grossular and 30%to 40%andradite(Fu et al.1991,1993).Vesuvianite is typically subhedral and intergrown with garnet and wollastonite.Fluid inclusion studies indicated that this stagehas high homogenization temperature from 582 to 645°C,with salinities of 7 wt%–9 wt%NaCl equiv(Fu et al.1993).

Fig.3 Paragenetic sequence of minerals for the Lamo Zn–Cu deposit

Stage II is a wet skarn stage and contains epidote,amphibole,fluorite,and quartz.These minerals commonly replaced the garnet,diopside,and vesuvianite of the Stage I.Sulfide mineralization began to develop in this stage and occur as stratiform(Fig.4d,e)or be disseminated in the skarns(Fig.4b).Sulfide minerals include sphalerite,arsenopyrite,pyrrhotite,minor molybdenite,bismuthinite and chalcopyrite,which fill or replace the garnet and diopside(Fig.4c,f).Fluid inclusion studies showed that this stage was formed at temperatures from 359 to 396°C,with salinities of 13 wt%–47 wt%NaCl equiv(Fu et al.1993).

Stages III and IV are considered the ore sulfide stages that occur as massive ores(Fig.4g)in the outermost zone adjacent to marble.Stage III contains various sulfides and hydroxyl-bearing silicates,including biotite,sericite,chlorite,sphalerite,arsenopyrite,galena,pyrite,pyrrhotite,and minor chalcopyrite(Fig.4h).Stage IV isdominated by quartz,carbonates,chlorite,sphalerite,galena,pyrite,minor chalcopyrite and bournonite.

4 Sampling and analytical methods

The ten samplesanalyzed in this study were collected from the Lamo deposit and the Dachang orefield.Seven samples werecollected from the underground tunnels(680 m level)at the Shamuchong part of the Lamo deposit(Fig.2).They occurred within the skarn zones closeto thegranite.Re–Os dating samples(LM-601,LM-603,LM-604,LM-605,LM-606,and LM-607)were collected from the same molybdenite veinlet(Fig.4a).They contain garnet,diopside,molybdenite,minor bismuthinite and scheelite(Fig.4b,c).One ore sample(LM613)selected for in-situ Pb isotopes analyses was from the same skarn zone that hosted the molybdenite veinlet at the Lamo deposit(Fig.2b).It is dominated by sphalerite,arsenopyrite,galena,pyrite,minor chalcopyrite and bournonite(Fig.4g,h).To compare with the Pb isotopes of sulfides,two granite samples(LM530 and LM590)were collected from the 530 m and 590 m level of tunnels at the Lamo deposit(Fig.2),respectively.One granite porphyry sample(GF407)was collected from the-200 m level of tunnelsat the Gaofeng deposit in the Dachang ore field.

Fig.4 Examplesof oresfrom the Lamo deposit and feldspars of the granite in the Dachang ore field.a Molybdenite occurs as veinlets in skarn.b A hand specimen showing disseminated molybdenite associated with garnet and epidote.c SEM back-scattered electron(BSE)image showing molybdenite intergrown with scheelite,bismuthinite,diopside and garnet.d,e Stratiform sulfide ore containing sphalerite and arsenopyrite occurred in the skarn.f Arsenopyrite and sphalerite fill or replaced garnet(BSE).g Massive sulfide ores in the Lamo deposit.h Pyrite,arsenopyrite,and sphaleritein themassiveoresreplaced by galenaand bournonite.i Graniteporphyry and its K-feldspar j from the Gaofeng tinpolymetallic ore deposit.k Biotite granite and its plagioclase l from the Longxianggai pluton.Kf K-feldspar;Pl plagioclase;Mo molybdenite;Grt garnet;Ep epidote;Di diopside;Py pyrite;Apy arsenopyrite;Sp sphalerite;Ccp chalcopyrite;Bis bismuthinite;Sh scheelite;Bnn bournonite;Gn galena

For Re–Osdating,molybdenite was separated by a steel needle and then handpicked under a binocular microscope.Re–Os isotope analyses were performed at the State Key Laboratory of Isotope Geochemistry,Guangzhou Institute Geochemistry,Chinese Academy of Sciences.The analytical procedure for the determination of Re concentrations and Os isotope ratios was described as follows:The185Re spike,natural Os standard solutions and molybdenite samples(0.025–0.1 g)were weighed and digested with the concentrated HNO3for 24 h at 240°C in sealed Carius tubes.Os distilled as OsO4from the supernatant was trapped using pure water and thus could be directly analyzed by ICP-MS.Re was determined by ICPM Safter separation and purification using anion exchange resin(AG1X8).Details of the analytical procedures are described in the references(Shirey and Walker 1995;Sun et al.2010;Li et al.2015).

The correction of Re isotopic ratios in the sample-spike mixtures was based on the factors calculated from the average ratios on the bracketed standards relative to the International Union of Pure and Applied Chemistry(IUPAC)ratios(Rosman and Taylor 1998).Mass bias correction for Os was ascertained on-linein each operational procedure.Themass biasfactor for192Os/187Oswasobtained by normalization to192Os/188Os=3.08271.A range of 2%for the correction factors has been observed based on the results from the initial to final standard runs.Model ages were calculated using t=[ln(1+187Os/187Re)]/λ,where λ (187Re)=1.666 ×10-11a-1(Smoliar et al.1996).Re–Os isochron age was calculated using ISOPLOT 3.0(Ludwig 2003).Absolute uncertainties are given at 2σlevel(standard deviation).The molybdenite reference material of GBW04436 was repeatedly measured along with the samples.The Re–Osage of this reference material was 140.4±2.3 Ma(2 s,n=4).The result is consistent with certified values and the values previously reported by Du et al.(2004)and Liet al.(2010).

For in-situ Pb isotopes analyses,the samples were polished into thin sections and their surfaces were cleaned with ethanol,high-purity water and 2%HNO3prior to analysis.In-situ Pb isotopes micro analyses of sulfides and feldspars were measured at the State Key Laboratory of Continental Dynamics,Northwest University,China.The analytical method has been previously described in detail by Chen et al.(2014),Yuan et al.(2015),and Bao et al.(2017).

It used LA-MC-ICP-MS,where the LA system was the 193 nm RESOLution M-50(ASI,Australia),the MC-ICPMSwas the Nu Plasma IIMC-ICP-MSby Nu Instruments(Nu Ins,UK),and the membrane desolvator system was Aridus II Desolvation Nebulizer System(Aridus II,Cetac,USA).Analytical signals could be deducted through the Time Resolved Analysis(TRA)mode.The integration time was approximately 0.2 s,the energy density was 6 J/cm2,and the time of signal acquisition was 50 s.The laser frequency for galena was 3 Hz,with 13μm of spot size,for feldspar,molybdenite and pyrite was 6 Hz,with 100μm of spot size,respectively.Tl standard solution(NIST SRM 997)was introduced by membrane desolvator(50–100 μl/min,PFA trace nebulizer)to calibrate Pb isotopes with the fractionation factor calculated from203Tl/205Tl ratio(2.38890;Thirlwall 2002).Pb standard solution(NIST SRM 981)was used to monitor the accuracy and precision of instrumental analysis through desolvator.NIST SRM 610 reference glass was measured once for every five spots to be served as the external standard and quality control sample to monitor the reliability of Pb isotopic compositions.The results(isotope ratios)of NIST SRM 610 analysis were as follows:208Pb/204Pb=36.968±0.007,207Pb/204Pb=15.512±0.003,206Pb/204Pb=17.051±0.003.The external accuracy of measurement of both206,207,208Pb/204Pb and207,208Pb/206Pb ratios was expected to be better than±0.05%(Chen et al.2014).Considering this analytical method is not applicable for those minerals containing low Pb concentrations(＜10 ppm),in this study,feldspars and sulfides(e.g.,molybdenite,pyrite and galena)with high Pb contents were selected for in-situ Pb isotopes microanalyses.

5 Results and discussions

5.1 Re–Os age of molybdenite

The Re–Os isotope data and model ages for six molybdenite samples from the Lamo Zn–Cu deposit are listed in Table 1.Re–Os isochron age is shown in Fig.5.

The results show that Re and187Os contents of the analyzed molybdenite samples varied from 1199.7 to 3005.0 and 1.1315 to 2.8226 ppb,respectively.Calculated Re–Os model ages of six samples were consistent,ranging from 89.64±0.74 to 90.54±1.33 Ma(Table 1).These samples yield a good Re–Os isochron age of 90.0±1.1 Ma with a MSWD of 0.72(Fig.5a),which is consistent with a weighted average model age of 90.06±0.45 Ma(Fig.5b).This age is much younger than the reported garnet Sm–Nd isochron age of 95± 11 Ma(Liang et al.2011b)and quartz fluid inclusions Rb–Sr isochron age of 99±6 Ma(Li et al.2008)for the Lamo deposit.Although there isno evidence that the molybdenite coexisted with the Zn–Cu sulfides at the Lamo deposit,they are hosted in the same skarn zones(Fig.2b).Therefore,it is reasonable to infer that our molybdenite Re–Os age(90.0±1.1 Ma)may be representative of the timing of Zn–Cu mineralization for the Lamo deposit.

Previous studies have reported the ages of several adjacent cassiterite-sulfide deposits in the Dachang ore field,using various isotope dating methods.Wang et al.(2004)obtained40Ar-39Ar plateau ages of 94.5±0.3 Ma for quartz and 91.4±2.9 Ma for sanidine from the No.91 orebody in the Changpo-Tongkeng deposit,and of 94.6±0.5 Ma for quartz from the No.100 orebody in the Gaofeng deposit.Cai et al.(2005,2006b)reported the Rb–Sr isochron ages of 93.4±7.9 and 94.1±2.7 Ma for fluid inclusions of quartz from the No.92 orebody of the Changpo-Tongkeng deposit and cassiterite-sulfide-quartz veins of the Kangma deposit,respectively.Recently,cassiterites from several cassiterite-sulfide deposits in the Dachang ore field have been dated using the LA-ICP-MS U–Pb method.Wang et al.(2015)and Guo et al.(2017)reported the cassiterite U–Pb ages of 95.8± 2.6 and 91 to 93 Ma for the No.92 orebody of the Changpo-Tongkeng deposit and the No.100 orebody in the Gaofeng deposit,respectively.These ages,together with our molybdentite Re–Os age,overlap the ages of the granite and its porphyritic phase(91–97 Ma)in the Dachang ore field,suggesting that all of depositsin the Dachang were formed in a magmatic hydrothermal system related to the Longxianggai granite(Fu et al.1991,1993;Chen et al.1993;Cai et al.2005,2007;Li et al.2008).

Table 1 Re and Os isotope data of molybdenite from the Lamo Zn–Cu deposit in the Dachang ore field

Fig.5 Re–Os isochron diagram(a)and weighted mean age diagram(b)of molybdenite from the Lamo Zn–Cu deposit

5.2 In-situ Pb isotopes and source of metals

LA-MC-ICP-MS in situ Pb isotopic compositions of sulfides from the Lamo Zn–Cu deposit are listed in Table 2.Sulfide minerals analyzed include molybdenite,galena,and pyrite,whereas sphalerite and arsenopyrite cannot be measured becausethey havevery low concentrations of Pb,which is the limit of the LA-MC-ICP-MS analysis.

A total of 19 spots for sulfides have been measured by LA-MC-ICP-MS.Seven spotson molybdenitehavearange of206Pb/204Pb ratios from 18.532 to 18.565,207Pb/204Pb from 15.715 to 15.746,and208Pb/204Pb from 38.947 to 39.033(Table 2;Fig.6a,b).One spot on molybdenite(LM602-MO-4)has relatively lower Pb isotopic compositions (206Pb/204Pb=18.475,207Pb/204Pb=15.661,208Pb/204Pb=38.818).This difference may be attributed to its lower concentration of Pb that is close to the limit of LA-MC-ICP-MS analysis.Model ages of molybdenite(216–234 Ma)areincompatible(too old)ascompared with their Re–Os age of 90 Ma obtained from thisstudy.Galena has a narrow range of206Pb/204Pb ratios from 18.515 to 18.517,207Pb/204Pb from 15.701 to 15.705,and208Pb/204Pb from 38.945 to 38.993.The206Pb/204Pb ratios of pyrite vary from 18.489 to 18.523,207Pb/204Pb from 15.693 to 15.711,and208Pb/204Pb from 38.917 to 38.991.All of Pb isotope data plot along a steep slope that lies mostly above the average crustal Pb model curve of Zartman and Deo(1981)(Fig.6a)and overlapstherange of previoussulfides and sulfosalts conventionally determined by bulk analyses(Fig.6c,d).

To compare the Pb isotopic compositions for sulfides,less altered feldspars in the granite and its porphyritic phase(Fig.4i–l)from the Dachang ore field are measured by LA-MC-ICP-MS,which are listed in Table 2.Eleven spots on different feldspar grains in the granite have a larger range of206Pb/204Pb ratios from 18.417 to 18.594,207Pb/204Pb from 15.641 to 15.728,and208Pb/204Pb from 38.791 to 39.073(Table 2).The206Pb/204Pb ratios of feldspars in the granite porphyry dikes vary from 18.467 to 18.546,207Pb/204Pb from 15.672 to 15.743,and208Pb/204Pb from 38.895 to 39.065.These data also plot along a steepslope that lies mostly above the average crustal Pb model curve(Fig.6c,d),which are similar to the in-situ Pb isotopes of sulfides.However,the in-situ Pb isotopes of feldspars are much different than those of the reported whole-rock granites that were conventionally determined by bulk analyses(Fig.6c,d).The reasons are unknown,possibly U loss caused by weathering and hydrothermal alteration of granites(Tosdal et al.1999).The overlapping of in-situ Pb isotopic compositions between sulfides and feldspars from the Dachang ore field suggests that the metals were mainly sourced from Cretaceous granitic magma.

Table 2 In-situ Pb isotope data of sulfides from the Lamo Zn–Cu deposit and feldspars in the granites from the Dachang ore field

Fig.6 In-situ Pb isotope compositions of sulfides from the Lamo Zn–Cu deposit and feldspars in the granite and granitic porphyry dike from the Dachang ore field.a 207Pb/204Pb versus 206Pb/204Pb;b 208Pb/204Pb versus 206Pb/204Pb.c,d Comparison of in-situ and bulk Pb isotopes data from the Dachang ore field.The bulk Pb isotopesdata are from Ding et al.(1988),Chen et al.(1993),Han et al.(1997),Gao(1999),Qin et al.(2002),Zhao et al.(2007),Liang et al.(2008),and Cheng and Peng(2014).Lead evolution curves are from Zartman and Doe(1981)

6 Conclusions

This study presents a new molybdenite Re–Os age and insitu Pb isotopes of sulfides from the Lamo Zn–Cu deposit in the Dachang ore field.Molybdenite Re–Os dating yields a reliable and accurate isochron age of 90.0±1.1 Ma.Thisnew age is close to the ages of cassiterite(91–96 Ma)and the granite and its porphyritic phase(91–97 Ma)in the Dachang ore field,suggesting that all of deposits in the Dachang were formed in the Cretaceous granite-related magmatic hydrothermal system.

In-situ Pb isotopes of sulfides from the Lamo deposit have similar ranges of Pb isotopic compositions of the feldspars in the biotite granite and granitic porphyry dikes in the district,suggesting that the metals were mainly sourced from a granitic magma that was derived from melting of the upper crust.

AcknowledgementsWe gratefully acknowledge the Mining Company of Jilang Indium Industry for access to samples.This work is supported by the National Science Foundation of China(Grants Nos.41672080,41772079,41272113)and Outstanding Talent Foundation of the Institute of Geochemistry,Chinese Academy of Sciences.

Compliance with ethical standards

Conflict of interestThere is no conflict of interest.

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