文献类型：期刊文献

英文题名：Zircon U-Pb ages and Hf-O isotopes of Xiaomasa Miocene granite in the Ximeng area, western Yunnan, southwest China: Constraints on petrogenesis and tectonic setting

作者：Chen, Xiaocui Li, Peng Mao, Kainan Yang, Wei Yang, Wu Yan, Jun

第一作者：陈晓翠

通信作者：Chen, XC[1];Li, P[2]|[144407dd10cbfbc5998c2]陈晓翠;[14440bebcb7e5f9c421f9]陈晓翠;

机构：[1]Guizhou Inst Technol, Sch Resources & Environm Engn, Guiyang, Peoples R China;[2]Guizhou Inst Technol, Sch Resource & Environm Engn, 1 Caiguan Rd, Guiyang 550003, Peoples R China;[3]Guizhou Inst Technol, Guiyang, Peoples R China

第一机构：贵州理工学院资源与环境工程学院

通信机构：corresponding author), Guizhou Inst Technol, Sch Resource & Environm Engn, 1 Caiguan Rd, Guiyang 550003, Peoples R China;corresponding author), Guizhou Inst Technol, Guiyang, Peoples R China.|贵州理工学院;

年份：2023

外文期刊名：GEOLOGICAL JOURNAL

收录：;Scopus(收录号：2-s2.0-85160837314);WOS:【SCI-EXPANDED(收录号:WOS:000996079400001)】；

基金：the Major Research Plan of National Natural Science Foundation of China, Grant/Award Number: 92062106; the National Natural Science Foundation of China, Grant/Award Number: 4160020815; the Science and Technology Support Plan of Guizhou Province, Grant/Award Number: Qian (2017)1078

语种：英文

摘要：Characteristic granites of the East Tethyan Tectonic Domain (ETTD) are primarily exposed along the Himalayan orogenic belt and Gangdese batholith in the north, extend from western Yunnan in the centre, and through the Burma batholith to Peninsular Malaysia in the south. Western Yunnan is an important part of the ETTD magmatic arc, featuring characteristic granites that mainly developed between the Jurassic and Paleogene. Nonetheless, compared to other regions of the ETTD, Miocene magmatism has been poorly documented in western Yunnan. The Xiaomasa granite occurs in the Ximeng area of western Yunnan. In this study, we present U-Pb ages, and Hf-O isotope data for zircon crystals from the Xiaomasa granite pluton. Laser Ablation-Multicollector-Inductively Coupled Plasma-Mass Spectrometry (LA-MC-ICP-MS) zircon U-Pb dating yields precise emplacement ages of 15.8-16.1 Ma for the Xiaomasa granite, indicating that Miocene granitic magmatism occurred in western Yunnan. Zircons from the Xiaomasa granite have negative e(Hf)(t) values ranging from -6.6 to -11.6, relatively high delta O-18 values (6.8%-10.2 parts per thousand), and two-stage Hf isotopic model ages (1.51-1.83 Ga). Zircon Hf-O isotopic characteristics indicate that the Xiaomasa granite was mainly derived from partial melting of ancient continental crust. The Ximeng Precambrian metamorphic basement is a probable material source for the granite. The Xiaomasa granite was probably produced by partial melting of the thickened Ximeng ancient metamorphic basement under a reduced pressure environment, reflecting a cumulative effect of the escape of Sundaland caused by the dynamics of the continuous India-Asia collision.