Sr and O isotopic characteristics of porphyries in the Qinling molybdenum deposit belt and their implication to genetic mechanism and type

被引：67

作者：

陈衍景

李超

张静

李震

王海华

机构：

[1] Guiyang Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China

[2] State Key Laboratory of Endogenetic Deposit, Nanjing University, Nanjing 210093, China Correspondence should be addressed to Chen Yanjing ,Department of Geology, Peking University, Beijing 100871, China

[3] ,Department of Geology, Peking University, Beijing 100871, China

[4] State Key Laboratory of Endogenetic Deposit, Nanjing University, Nanjing 210093, China Correspondence should be addressed to Chen Yanjing ,Department of Geology, Peking University, Beijing 100871, China

[5] Department of Geology, Peking University, Beijing 100871, China

来源：

Science China Earth Sciences | 2000年 / S1期

关键词：

Qinling Mountains; Mesozoic; granitoid; Sr and O isotopes; porphyry molybdenum deposit; collision orogen;

D O I：

暂无

中图分类号：

P618.65 [钼];

学科分类号：

0709 ; 081803 ;

摘要：

A great deal of Mesozoic hypobatholithic granites and hypabyssal porphyries develop in the Qinling Mountains. The former has long been regarded as transformation type (or S-type), and the latter associated with Mo-mineralization regarded as syntexis type (or l-type) granitoids. Statistics show that Sr, andδ18O of hypabyssal porphyries respectively range from 0.705 to 0.714, and from 7.2‰ to 12.1‰, agreeing with those of hypobatholithes (Sr1=0.705-0.710, δ18O = 6.1‰-10.4‰), which indicates that they share similar material sources and petrogenic mechanism. Based on analysis of lithological, mineralogical and geochemical characteristics of these granitoids and on study of their petrogenic tectonic background and regional geophysical data, we argue that both the shallow-seated porphyries and deep-seated batholithes were the products of Mesozoic collision between South China and North China paleocontinents. Subsequently, all these granti-toids should be attributed to collision type.

引用

页码：82 / 94

页数：13

共 15 条

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