马来西亚沙巴州Chert-Spilite组砂岩碎屑锆石U-Pb年龄及其地质意义  

U-Pb dating of sandstone detrital zircons from Chert-Spilite Formation in Sabah,Malaysia and its geological significance

作　　者：田志文 唐华风[1] 赵志刚 唐武 何凯伦 朱晨曦 王璞珺[1] TIAN Zhi-wen;TANG Hua-feng;ZHAO Zhi-gang;TANG Wu;HE Kai-lun;ZHU Chen-xi;WANG Pu-jun(College of Earth Sciences,Jilin University,Changchun 130061,China;CNOOC Research Institute Co.Ltd.,Beijing 100028,China)

机构地区：[1]吉林大学地球科学学院,长春130061 [2]中海油研究总院有限责任公司,北京100028

出　　处：《世界地质》2021年第1期52-64,共13页World Geology

基　　金：“十三五”国家科技重大专项科研项目(2016ZX05026-004-001)。

摘　　要：马来西亚沙巴州出露大面积的蛇绿岩套,其中以KET蛇绿岩和Chert-Spilite (Cs)组硅质岩和碎屑岩为代表。笔者以沙巴州Cs组中的砂岩为研究对象,对碎屑锆石U-Pb年龄进行分析,其结果显示样品KDS-Cs-1碎屑锆石年龄具有190~68 Ma (22%)、279~213 Ma (18%)、627~315 Ma(22%)和2 788~976 Ma (37%)四个区段分布特征,主峰值分别为117 Ma、234 Ma、415 Ma和1877 Ma。样品BLR-Cs-1碎屑锆石年龄具有196~90 Ma (20%)、350~212 Ma (19%)、770~404Ma (12%)和3 423~873 Ma (48%)四个分区特征,主峰值分别为104 Ma、249 Ma、509 Ma和1848 Ma。Cs组砂岩碎屑锆石年龄图谱表明前寒武纪锆石居多,其中还发现了一颗古太古代(3 423Ma)的锆石。通过对比与分析沙巴周边块体构造演化、地质特征和碎屑锆石年龄图谱,推测沙巴Cs组砂岩物源区主要为华夏-南海北部陆块、南沙地块和印支地块。Many ophiolites are exposed in the Sabah,Malaysia,represented by the KET and Chert-Spilite(Cs)formations.This paper takes the sandstone of Cs Formation in Sabah as the research object and analyzes the U-Pb dating of detrital zircon.The age spectrum of zircons of KDS-Cs-1 can be divided into four groups:190~68 Ma(22%),279~213 Ma(18%),627~315 Ma(22%)and 2788~976 Ma(37%),with the age peaks at 117 Ma,234 Ma,415 Ma and 1877 Ma,respectively.The age spectrum of zircons of BLR-Cs-1 can be divided into four groups:196~90 Ma(20%),350~212 Ma(19%),770~404 Ma(12%)and 423~873 Ma(48%),with the age peaks at 104 Ma,249 Ma,509 Ma and 1848 Ma,respectively.The age map of detrital zircons from the Cs Formation shows that the zircons are mainly Precambrian zircons,including one Paleoarchean(3423 Ma)zircon.By comparing and analyzing the tectonic evolution,geological characteristics and age comparisons of detrital zircons around Sabah,it is inferred that the provenances of the Cs Formation sandstone are mainly the Cathaysia-Northern South China Sea Block,Nansha Block and Indochina Block.

关 键 词：马来西亚 沙巴 Chert-Spilite组 碎屑锆石 物源分析 

分 类 号：P597.3[天文地球—地球化学]