Oldest Basement(ca.462 Ma)in Indonesian Borneo and its Implication for Early Paleozoic Tectonic Evolution of SE Asia

作     者：ZHU Junbin LI Shan Sayed MURTADHA ZHU Junbin;LI Shan;Sayed MURTADHA

作者机构：Institute of GeologyChinese Academy of Geological SciencesBeijing 100037China College of Earth and Planetary SciencesUniversity of Chinese Academy of SciencesBeijing 100049China Department of GeologySyiah Kuala UniversityBanda Aceh 23111Indonesia 

出 版 物：《Acta Geologica Sinica(English Edition)》 (地质学报（英文版）)

年 卷 期：2022年第96卷第6期

页      面：2093-2104页

核心收录：

学科分类：070904[理学-构造地质学] 070903[理学-古生物学与地层学(含：古人类学)] 0709[理学-地质学] 07[理学] 

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.41802243,41772232 and 42161144007) the fund from the Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources(Grant No.J1901-27) the Outlay Research Fund of the Institute of Geology,Chinese Academy of Geological Sciences(Grant No.J2008) the China Geological Survey Program(Grant Nos.DD20190358,DD20221646 and DD20190001).This study is a contribution to International Geoscience Programme(IGCP)project 662“Orogenic architecture and crustal growth from accretion to collision.”We thank two anonymous reviewers for their helpful suggestions and constructive comments that helped us to improve this manuscript 

主　　题：basement N Gondwana Proto-Tethys Embuoi Complex early Paleozoic Borneo 

摘      要：The lack of preserved basement results in uncertain placements of many terranes in Southeast ***,we flag the first evidence of the oldest basement in Indonesian Borneo,which can help locate terranes in Borneo on the northern margin of Gondwana in the early Paleozoic and explain the regional tectonic setting of the *** schist samples from the Embuoi Complex in the Semitau Block,Northwest Kalimantan yielded zircon U-Pb dates of 453.3±1.9 Ma and 462.4±2.6 Ma,respectively,representing the formation time of the ***,internal structural and high Th/U ratios of zircons indicate that the protolith of schists is of magmatic *** zircons haveεHf(t)values of−4.1 to+1.1 and Hf model ages of 1.37–1.69 Ga,indicating they were derived from a mixed source of juvenile crust with old *** comparison of zircon age distribution,two-stage Hf model ages andεHf(t)variations of the early Paleozoic igneous rocks from Semitau with those of South China,Tengchong–Baoshan,and Indochina,the Semitau Block was most likely a part of or placed next to the Indochina Block of northern Gondwana during the early *** a similar tectono-magmatic pattern on northern Gondwana formed a prolonged early Paleozoic arc-related belt associated with subduction of the Proto-Tethyan Ocean.