华南地质与矿产Issue(1)：11-25,15.DOI:10.3969/j.issn.1007-3701.2015.01.002
湖南锡田复式花岗岩体岩石学、岩石地球化学特征--兼对岩石成因类型、岩体侵位机制的探讨
Petrological and geochemical characteristics of Xitian pluton in Hunan province
摘要
Abstract
A NE-trending Sn-W bearing A-type granite belt which is composed of Huashan, Guposhan, Jiuyis-han, Qitianling granite batholiths are located in the western-middle part of Nanling Range. The Xitian granite in the north part of this belt is intruded in Late Triassic to Jurassic, with geochemical characteristics of high-K, mild alkaline and peraluminous, higher concentration of SiO2 and (K2O+Na2O), which is also rich in Y and poor in Ba, Sr and characterized by lower (87Sr/86Sr)i, higherε Nd(t) (>-8), lower tDM model age etc. The geo-chemical discriminative chart shows that Xitian grantie is A-type granite, considering to be part of Sn-W bear-ing A-type granite belt in southern Hunan-northern Guangxi region, the formation tectonic setting is that Late Triassic granite invaded after major collision in indisinian movement which was formed in the extend tectonic regime after collision;while Late Jurassic granite is post-orogenic granite, formed probably related to exten-tional environment,which caused by the subduction of the paleo Pacific plate. By means of collecting geology outside data, together with the explanation of contact relationship, contact region characteristic, distribution pattern of rocks, and planar flow structure, xenoliths, peripheral sink developed in the rocks, also combined by the image characteristic in arial photos, suggesting that Xitian granite are intruded in the manner of ballon ex-pand, while partly terminal intrusion probably is controlled by fracture.关键词
岩石学/岩石地球化学/岩石成因/岩体侵位机制,锡田岩体Key words
Xitian granite/A-type granite/diapir intrusion/Indosinian-Yanshanian movement/Hunan Province分类
地质学引用本文复制引用
陈迪,邵拥军,刘伟,马爱军,刘耀荣..湖南锡田复式花岗岩体岩石学、岩石地球化学特征--兼对岩石成因类型、岩体侵位机制的探讨[J].华南地质与矿产,2015,(1):11-25,15.基金项目
中国地质调查“湖南1:5万腰陂、高陇、茶陵县、宁冈县幅区域地质调查（编码1212011120796）”项目资助 （）
