Discovery of～409 Ma Amphibolite in the Zhikong-Songduo Subduction Complex,Southern Tibet

• 作者: XIE Long ZHU Lidong YANG Wenguang WANG Gang LU Zhiyou MAI Yuanjun ZHONG Yao ZHANG Hongliang
• 来源期刊: 地质学报（英文版）
• 年，卷（期）: 2021,（2）
• 所属期刊栏目: RESEARCH ADVANCES
• 页码范围: 699-701
• 页数: 3页
• 语种: 英文

摘要

Objective Discovery of Songduo eclogites exposed in southern Tibet has attracted wide attention from geologists.The recently completed regional geological surveys show that a lithotectonic belt extends at least 100 km from Zhikong in the west to Songduo in the east and is mainly composed of oceanic fragments such as eclogites,blueschists,ophiolites and oceanic island assemblages,with their associated arc igneous and metasedimentary rocks.This is referred to hereafter as the Zhikong-Songduo(ZS)subduction complex.The complex is interpreted to have been produced during Permo-Triassic subduction of the Paleo-Tethys oceanic plate.Nevertheless,the detailed composition of the ZS subduction complex and the evolutionary history prior to its Permo-Triassic subduction-accretion still lack constraints.In this paper,we report the zircon U-Pb ages and Hf isotopes of the Gecaiyong amphibolite in the ZS subduction complex to determine the crystallization age and magmatic source characteristics of the protolith,thus providing a new perspective for understanding the tectonic history of the ZS Paleo-Tethys Ocean during the Late Paleozoic.