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漠河盆地二十二站组砂岩形成时代、物源分析及构造背景:来自砂岩地球化学及碎屑锆石U-Pb年代学的制约
投稿时间:2019-07-22  修订日期:2019-09-11  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2020013
摘要点击次数: 84
全文下载次数: 122
作者单位E-mail
王远超 中国地质科学院矿产资源研究所中国地质大学北京地球科学与资源学院
中国人民武装警察部队黄金第十二支队
 
wycv@foxmail.com 
赵元艺)* 中国地质科学院矿产资源研究所 yuanyizhao2@sina.com 
刘春花 中国地质科学院矿产资源研究所  
水新芳 中国地质科学院矿产资源研究所  
程贤达 中国地质大学北京地球科学与资源学院
中国地质调查局西安矿产资源调查中心 
 
巩鑫 中国地质大学北京地球科学与资源学院贵州省有色金属和核工业地质勘查局地质矿产勘查院  
刘璇 中国地质大学北京地球科学与资源学院  
谭伟 中国地质大学北京地球科学与资源学院  
洪骏男 黑龙江省齐齐哈尔地质勘查总院  
基金项目:国家重点研发计划项目
中文摘要:内容提要:漠河盆地位于蒙古-鄂霍茨克褶皱带中的额尔古纳微板块的北缘,地处西伯利亚板块与华北板块碰撞拼合部位。二十二站组是漠河盆地中生代沉积地层之一,前人对其形成时代和物源进行了探讨,但仍存在很大争议,本文在前人研究的基础上,通过碎屑锆石年代学和岩石地球化学再次厘定其形成时代,并对物源及源区大地构造背景进行探讨。碎屑锆石年代学研究表明,二十二站组碎屑锆石大部分为岩浆结晶锆石,少部分锆石颗粒为增生-混合型锆石,显示出经历了后期构造-热事件改造。此外,少部分锆石颗粒磨圆好,显示出其经历了多次搬运、沉积过程的特征,从而指示早先形成的古老沉积岩为二十二站组提供了物源。获得最年轻的锆石年龄为134±1Ma,结合前人区域地质调查报告中发现了J3-K1时期的古生物化石,将二十二站组的沉积下限限定为早白垩世早期,同时也说明了研究区存在早白垩世早期火成岩物源。主、微量元素构造环境判别及物源分析揭示二十二站组物源主要为活动大陆边缘及大陆岛弧环境的上地壳长英质、安山质源区,并混有下地壳深部物质(基性岩)。锆石LA-ICP-MS U-Pb定年结果表明,二十二站组碎屑锆石有随着时代变新锆石保存数量增多的趋势,其年龄分布整体上可被划分为四个时期:新太古代(2711±10Ma,N=1),说明额尔古纳地块存在新太古代的基底信息;中元古代-古元古代(2428-1238Ma,N=11),指示兴华渡口岩群为二十二站沉积物提供了部分物源;新元古代(921-561Ma,N=7),是晋宁期古亚洲洋向额尔古纳-兴安地块俯冲形成大陆岩浆弧(活动大陆边缘)构造事件在研究区的记录;中生代-晚古生代(540-134Ma,N=280),是蒙古-鄂霍茨克洋俯冲、闭合过程中形成的花岗质岩浆在研究区的物质记录,且显生宙花岗岩质岩浆为二十二站组提供了最为丰富的物源。
中文关键词:关键词:碎屑锆石U-Pb年代学  地球化学  砂岩  物源分析  二十二站组  漠河盆地  
 
Detrital zircon geochronology, geochemistry and geological significance of sandstone in the Ershi’erzhan Formation of the Ershi’yizhan mining area, Mohe Basin
Author NameAffiliationE-mail
WANG Yuanchao Insititute of Mineral Resources,Chinese Academy of Geological SciencesSchool of Earth Sciences and ResourcesChina University of GeosciencesBeijing12th Gold Team of Chinese People’s Armed Police wycv@foxmail.com 
ZHAO Yuanyi Insititute of Mineral Resources,Chinese Academy of Geological Sciences yuanyizhao2@sina.com 
LIU Chunhua Insititute of Mineral Resources,Chinese Academy of Geological Sciences  
SHUI Xinfang Insititute of Mineral Resources,Chinese Academy of Geological Sciences  
CHENG Xianda School of Earth Sciences and ResourcesChina University of GeosciencesBeijingXi’an Center of Mineral Resources SurveyCGS  
GONG Xin School of Earth Sciences and ResourcesChina University of GeosciencesBeijingGeological and Mineral Exploration Institute, Guizhou Bureau of Geological exporation for Non-ferrous Metals and Nuclear Industry  
LIU Xuan School of Earth Sciences and ResourcesChina University of GeosciencesBeijing  
TAN Wei School of Earth Sciences and ResourcesChina University of GeosciencesBeijing  
Hong Junnan Heilongjiang Qiqihar General Institute of Geological Exploration  
Abstract:Abstract:The Mohe Basin is located in the northern margin of the Erguna microplate in the Mongolia-Okhotsk fold belt. It is located in the collision zone between the Siberian plate and the North China plate. The Ershi’erzhan Group is one of the Mesozoic sedimentary strata in the Mohe Basin. The predecessors discussed its formation age and source, but there is still much controversy. Based on the previous studies, the zircon chronology of detrital zircons and rock geochemistry again determines the age of its formation, and explores the tectonic setting of the source and source areas in this paper. The chronological study of detrital zircons shows that most of the detrital zircons in Ershi’erzhan Group are magmatic zircons, and a small part of zircon particles are hyperplastic-mixed zircons, which shows that they have undergone post-structural-thermal event modification. In addition, a small portion of the zircon particles are rounded, indicating that they have undergone multiple handling and deposition processes,suggesting that the early formation of ancient sedimentary rocks provided a source for the Ershi’erzhan group. The youngest zircon age is 134±1Ma. In the previous regional geological survey report, the fossils of the paleontology in the J3-K1 period were found, and the sedimentary limit of Ershi’erzhan Group was limited to the early Cretaceous, and it also explained the area of the early Cretaceous igneous rocks existed in the study area. The tectonic environment discrimination of the main and trace elements and provenance analysis reveal that the source of Ershi’erzhan Group is mainly the felsic upper crust and the Andesitic source area of upper crust of the active continental margin and the continental island arc environment, and is mixed with the lower crust deep matter ( Basite rock). The zircon LA-ICP-MS U-Pb dating results show that the detrital zircon in Ershi’erzhan Group has a tendency to increase the amount of zircon preservation with the age, and its age distribution can be divided into four periods as a whole: Neoarchean (2711±10Ma), indicating the existence of the basement information of the Neoarchean in the Erguna massif; the Mesoproterozoic-Palaeozoic (1238-2428Ma), indicating that the Xinghuadukou rock group is the partial sediment source of Ershi’erzhan Group;Neoproterozoic (561-921Ma) is a record of the continental magmatic arc (active continental margin) tectonic events in the study area during the subduction of the ancient Asian ocean to the Erguna-Xing"an block of the Jiningian period; the Mesozoic - Late Paleozoic (134-540Ma), a material record of the granitic magma formed during the subduction and closure of the Mongolian-Okhotsk in the study area, and the Phanerozoic granitic magma provided the most rich source for the Ershi’erzhan Group.
keywords:detrital zircon U-Pb chronology  geochemistry  sandstone  provenance analysis  Ershi’erzhan Group  Mohe Basin  
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