南岭地区几个与锡(钨)矿化有关的岩体的岩浆演化

Magmatic evolutions of several granite plutons related to Sn (W) mineralizations in the Nanling region, China.

南岭地区是中国重要的钨、锡成矿区,钨、锡矿化与该区燕山期侵位的花岗岩关系密切。在对南岭花岗岩的研究中发现,高的εNd、低的T2DM标志着有较多地幔物质的混入。在受地幔物质影响较大的杭州-诸广山-花山(HZH)带内出现较多的锡矿化;在地幔物质影响较小的地区锡矿化则相对较少。在总结前人关于南岭地区姑婆山、骑田岭、千里山和大吉山4个岩体的同位素、微量元素、稀土元素等资料的基础上,对4个岩体源岩中地幔物质的相对含量、岩浆演化过程、出溶流体的性质等进行了比较。结合4个岩体矿化类型的差异,认为地幔物质除可能为锡矿化的物质来源外,地幔物质混入量的差异还可能通过影响与矿化有关的花岗岩岩浆演化的过程而决定钨、锡矿化的差异。

The Nanling region is an important tungsten-tin metallogenic province in China, where tungsten and tin mineralizations have close relations with the Yanshanian granite in the region. In the study of the Nanling granite, the authors found that higher values of εND and lower values of T2DM indicate contamination with more mantle material. More tin mineralization occurs in Hangzhou- Zhuaguangshan-Huashan belt, where the granite contains more mantle contaminants; whereas tin mineralization is of infrequent occurrence where mantle contaminants are less. This paper summiarizes the isotope, trace element and REE data of the Guposhan, Qitianling, Qianlishan and Dajishan intrusions and, on that basis, compares the relative contents of mande contaminants, magmatic evolution and characteristics of the exsolution fluids in the source rocks of the four intrusions. According to this comparison, combined with the differences in mineralization types between the four intrusions, this paper concludes that the differences in amount of mantle contaminants can determine the differences of tungsten and tin mineralizations by influencing the granite magmatic evolution related to mineralization.