New Discovery of～1866 Ma High-temperature Mylonite in the Helanshan Complex:Marking a Late-stage Ductile Shearing in the Khondalite Belt,North China Craton

• 作者: QIAO Hengzhong YIN Changqing ZHANG Jian QIAN Jiahui WU Shangjing
• 来源期刊: 地质学报（英文版）
• 年，卷（期）: 2021,（4）
• 所属期刊栏目: RESEARCH ADVANCES
• 页码范围: 1418-1419
• 页数: 2页
• 语种: 英文

摘要

Objective The Khondalite Belt is a nearly E-W-trending Paleoproterozoic Himalayan-type orogen in the Western Block of the North China Craton.It is regarded as a result of the collision between the northern Yinshan Block and the southern Ordos Block at～1.95 Ga,which led to the formation of the united basement of the Western Block(e.g.,Zhao et al.,2005;Yin et al.,2011).The Khondalite Belt has undergone long-term continent-continent collisional orogenic processes,and a remarkable series of late-stage orogen-parallel ductile shear zones developed(e.g.,Huang et al.,2013;Gong et al.,2014).However,the timing of these ductile shear deformations was poorly constrained because of the lack of geochronological data.This inevitably hampers a comprehensive understanding of the deformation history of the Khondalite Belt.Therefore,we carried out zircon U-Pb dating of a high-temperature mylonite from the Paleoproterozoic ductile shear zones in the Helanshan Complex,the westernmost part of the Khondalite Belt.These data will shed new light on the Paleoproterozoic tectonic evolution of the Khondalite Belt.