河北华尖金矿稳定同位素特征及其地质意义  

Characteristics and Geological Significance of Stable Isotopes in the Huajian Gold Deposit,Hebei Province

作　　者：石成龙[1] 宋扬[2] 胡建中[1] 赵博[1] 王涛[1] 廖煜钟 

机构地区：[1]中国地质大学(北京)地球科学与资源学院,北京100083 [2]中国地质科学院矿产资源研究所,北京100037

出　　处：《矿物岩石地球化学通报》2015年第2期362-368,共7页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：中央级公益性科研院所基本科研业务专项(K1306);全国危机矿山接替资源找矿专项(200899363)

摘　　要：华尖金矿位于冀东大型金矿带内,赋存于太古宙变质岩及中生代岩浆岩中。在详细分析华尖金矿床地质特征的基础上,研究了石英脉的氢、氧同位素和黄铁矿的硫、铅同位素组成特征。研究发现,本区载金黄铁矿δ34S值变化范围变化于1.5‰~5.8‰,具有壳源岩浆岩特征,载金黄铁矿铅同位素206Pb/204Pb值变化为16.02~16.25,207Pb/204Pb为15.161~15.213,208Pb/204Pb为35.953~36.12,均有下地壳铅源的特征。含金石英脉的δ18O水在0.49‰~5.45‰,δ18OV-SMOW为10.3‰~14.2‰,δD为-72.1‰^-63.1‰,具有岩浆热液石英的特征,部分样品偏离火成石英的区域,可能是成矿热液混有大气降水的结果。综合研究表明,该矿床成矿物质主要来源于燕山期的牛心山花岗岩体,其次为遵化群变质岩围岩。The Huajian gold district is located in the large gold ore belt of northern Hebei, north margin of the north China Craton. The ore deposit is hosted in metamorphosed rocks and magma rocks, and faults are the main structural pattern in this area. Based on the geologic feature, we investigated isotope compositions of sulfur and lead in the paragenous pyrite, as well as the oxygen isotope composition of the paragenous quartz in fluid inclusions.We found that the δ^34S value of pyrite in the main orebody ranges from 1.5‰ to 5.8‰, having characteristics of the crustal source magmatic rock. ^206Pb/^204Pb values range from 16.02 to 16.25, ^207Pb/^204Pb values range from 15. 161 to 15. 213, and ^208Pb/^204Pb values range from 35. 953 to 36. 12, all of these are consistent with the typical lead isotope characteristics of the lower crust. δ^18OH2O values of fluid inclusions within the paragenous quartz range from 0.49‰ to 5.45‰, δ^81SOV-SMOW values range from 10.3‰ to 14.2‰, δD values range from -72. 1‰ to -63. 1‰, suggesting that ore fluids mainly came from magmatic hydrothermal fluids with participation of small amounts of atmospheric water. Our research indicated that the ore-forming materials mainly derived from Mesozic magmatic hydrothermal activities-the Niuxinshan Intrusive complex, and secondly derived from the metamorphosed Neoarchean （Zunhua Group） rocks-the surrounding rocks.

关 键 词：石英脉金矿 稳定同位素 成矿流体和物质来源 华尖金矿 华北克拉通北缘 

分 类 号：P618.51[天文地球—矿床学]