地质学报（英文版）2007，Vol.81Issue(1)：81-89,9.
Single Zircon LA-ICP-MS U-Pb Dating of the Guandimiao and Wawutang Granitic Plutons in Hunan, South China and Its Petrogenetic Significance
Single Zircon LA-ICP-MS U-Pb Dating of the Guandimiao and Wawutang Granitic Plutons in Hunan, South China and Its Petrogenetic Significance
摘要
Abstract
The Guandimao and Wawutang plutons are located at the center of Hunan, South China.The former is mainly composed of biotite monzonitic granites/granodiorites and two-mica monzonitic granites, but the latter only consists of biotite monzonitic granites. The zircon ages of 203.0±1.6 Ma (biotite monzonitic granites) and 208.0±3.2 Ma (two-mica monzonitic granites) for the Guandimao pluton and 204±3 Ma for the Wawutang pluton obtained with the LA-ICP-MS U-Pb dating indicate that they were formed during the late Indosinian. In consideration of other geochronological data from Indosinlan rocks of South China and adjacent regions, it is inferred that the two plutons were derived from crustal materials by decompressional melting in a post-collisional tectonic setting during spontaneous thinning of the thickened curst. Moreover, the inherited zircon age of 1273±k57 Ma from the Wawutang pluton indicates that the source of the two plutons is related to the early Proterozoic crustal basement.关键词
zircon LA-ICP-MS U-Pb dating/granite/Indosinian movement/CL imagesKey words
zircon LA-ICP-MS U-Pb dating/granite/Indosinian movement/CL images分类
天文与地球科学引用本文复制引用
CHEN Weifeng,CHEN Peirong,ZHOU Xinmin,HUANG Hongye,DING Xing,SUN Tao..Single Zircon LA-ICP-MS U-Pb Dating of the Guandimiao and Wawutang Granitic Plutons in Hunan, South China and Its Petrogenetic Significance[J].地质学报（英文版）,2007,81(1):81-89,9.基金项目
This research was supported by the National Natural Science Foundation of China (No. 40372036) and the Key Project of the Ministry of Education, China (No. 306007).We are grateful to the anonymous reviewers, their constructive reviews helped to improve the manuscript. We deeply thank Wang Juncan from the No.230 Research Institute, CNNC, Changsha for his help. （No. 40372036）
