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Geochemistry of meta-sedimentary rocks associated with the Neoarchean Dagushan BIF in the Anshan-Benxi area, North China Craton: Implications for their provenance and tectonic setting

文献类型：期刊论文

作者Tong, Xiaoxue1,2,3; Wang, Changle1,2,3; Peng, Zidong1,2,3; Huang, Hua4; Zhang, Lianchang1,2,3; Zhai, Mingguo1,2,3
刊名PRECAMBRIAN RESEARCH
出版日期2019-06-01
卷号325页码:172-191
关键词Geochemistry Dagushan BIF Meta-sedimentary cocks Provenance Tectonic setting North China Craton
ISSN号0301-9268
DOI10.1016/j.precamres.2019.02.022
英文摘要The Anshan-Benxi area is situated in the northeastern part of the North China Craton (NCC) and consists predominantly of Neoarchean supracrustal rocks and plutons with minor Eoarchean to Mesoarchean rocks. These supracrustal rocks were originally considered to be formed synchronously (similar to 2.5 Ga) at different localities on an active continental margin. Recently, more detailed petrographic, geochemical, and geochronological analyses showed that the supracrustal strata in the Benxi area (2.56-2.53 Ga) were slightly older than those in the Anshan area (2.53-2.51 Ga), which further indicates that they were formed during opening and closure of the back-arc basin, respectively. However, the Dagushan banded iron formation (BIF) and associated supracrustal rocks in the Anshan area were interpreted to be deposited in Mesoarchean (similar to 3.10 Ga), which constructs a clear contrast with other supracrustal rocks in the Anshan-Benxi area and renders previous tectonic models controversial. On the basis of detailed field investigations in the Dagushan area, we present in situ zircon U-Pb-Hf isotopic, whole-rock geochemical and Sm-Nd isotopic data of a suite of meta-sedimentary rocks (i.e., meta-arenites, meta shales, and high-Fe meta-shales), in order to provide constraints on their depositional age, provenance, and tectonic setting. The weighted mean U-Pb ages of the youngest group of detrital zircons for the meta-arenite in the Dagushan area, coupled with the maximum metamorphic age of similar to 2.51 Ga in the Anshan-Benxi area, suggest that the Dagushan BIF was deposited between 2.53 and 2.51 Ga. Geochemical features such as the Al2O3/TiO2 and Th/Zr values, and REE patterns suggest that the meta-arenites and meta-shales were mainly derived from felsic igneous sources, whereas the high-Fe meta-shales were predominantly sourced from mafic rocks. The U-Pb age spectrum diagram of detrital zircons within meta-arenites further indicates that the dominant source rocks may be the coeval volcanic rocks in the Benxi area. Our zircon Hf isotopes, coupled with other previously published zircon Hf isotopic data from Neoarchean supracrustal rocks in the Anshan-Benxi area, suggest that major juvenile crustal growth and reworking events occurred at 2.9-2.7 Ga and similar to 2.5 Ga, respectively. In all, the Dagushan meta-sedimentary rocks were probably deposited in a back-arc basin on the ancient continental margin.
WOS关键词ZIRCON U-PB ; BANDED IRON-FORMATIONS ; ARCHEAN CRUSTAL EVOLUTION ; HF ISOTOPIC COMPOSITIONS ; RARE-EARTH-ELEMENTS ; TRACE-ELEMENT ; LIAONING PROVINCE ; LU-HF ; METASEDIMENTARY ROCKS ; NEODYMIUM ISOTOPES
资助项目National Natural Science Foundation of China[41572076] ; National Natural Science Foundation of China[41872087] ; National Natural Science Foundation of China[41602085] ; National Natural Science Foundation of China[41602097]
WOS研究方向Geology
语种英语
WOS记录号WOS:000463463800010
出版者ELSEVIER SCIENCE BV
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/91283]  
专题地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者Wang, Changle; Zhang, Lianchang
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.China Met Geol Bur, Inst Mineral Resources Res, Beijing 101300, Peoples R China
推荐引用方式
GB/T 7714		 Tong, Xiaoxue,Wang, Changle,Peng, Zidong,et al. Geochemistry of meta-sedimentary rocks associated with the Neoarchean Dagushan BIF in the Anshan-Benxi area, North China Craton: Implications for their provenance and tectonic setting[J]. PRECAMBRIAN RESEARCH,2019,325:172-191.
APA Tong, Xiaoxue,Wang, Changle,Peng, Zidong,Huang, Hua,Zhang, Lianchang,&Zhai, Mingguo.(2019).Geochemistry of meta-sedimentary rocks associated with the Neoarchean Dagushan BIF in the Anshan-Benxi area, North China Craton: Implications for their provenance and tectonic setting.PRECAMBRIAN RESEARCH,325,172-191.
MLA Tong, Xiaoxue,et al."Geochemistry of meta-sedimentary rocks associated with the Neoarchean Dagushan BIF in the Anshan-Benxi area, North China Craton: Implications for their provenance and tectonic setting".PRECAMBRIAN RESEARCH 325(2019):172-191.

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来源：地质与地球物理研究所

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