四川省石棉县大水沟碲矿床成矿物质来源的一些证据

该矿床是一个新矿床类型,成矿作用分为磁黄铁矿-黄铁矿、辉碲铋矿和黄铁矿-黄铜矿三个阶段。矿化围岩为三叠纪镁铁质火山岩。在矿脉周围广泛发育有以黑云母、白云母、石英和斜长石为代表的蚀变及分带,磁黄铁矿和辉碲铋矿的硫同位素值δ³⁴S=-1.7‰-2.8‰,白云石和方解石的δ¹³C_PDB=-5.3‰——7.42‰,δ¹⁸O_SMOW=10.9‰-13.1‰。根据以硅质、碱质和富挥发组分为特征的围岩蚀变和S、O、C同位素信息,表明大水沟碲矿床的成矿物质来源与岩浆有关。

SOME EVIDENCES OF THE SOURCE OF SUBSTANCE IN THE DASHUIGOU TELLURIUM DEPOSIT OF SHIMIAN COUNTY, SICHUAN PROVINCE

The Dashuigou tellurium deposit of Shmian county，Sichuan province is a new type de-posit．The tellurium（gold）in the deposit can be devided into pyrite-pyrrotite stage, te-tradymite stage，and chalcopyrite-pyrite stage. Although volcanic mafic rock is the countryrock for the mineralizations，the alterations and their zonings around the ore veins are charac-terized by extensive developments of biotite， muscovite，quartz，and feldspar，Measurementof pyrrotite in pyritepyrrotite stage and tetradymite of tetradymite stage show thatδ~(34)S＝－1．7‰－2．8‰。Measurement of dolomite and calcite show thatyδ~(13)C_(PDB)＝－5．3‰－－7．42‰。andδ~(18)O_(SMOW)＝10．9‰－13．1‰，The alterations characterized by enrichments in silicon，alk-li,and volatile components in accordance with the data of S．O. C isotopes accordantly provethat the hydrothermal solution associated with the Dashuigou tellurium deposit is derivedfrom the depth and probably related to the emplacement of the sarnait stock which is located12 km north to the Dashuigou deposit.