Geochronology and geochemistry of the Paleoproterozoic Fangniushan supracrustal strata in the Xiaoshan area, southern North China Craton: Implications for tectonic evolution

被引:3
|
作者
Sun, Qianying [1 ,2 ]
Zhou, Yanyan [3 ]
Zhao, Taiping [1 ]
Pang, Lanyin [1 ,4 ]
Qiu, Yifan [1 ,4 ]
机构
[1] Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Mineral & Metallogeny, Guangzhou 510640, Peoples R China
[2] Guangdong Acad Sci, Natl Reg Joint Engn Res Ctr Soil Pollut Control &, Guangdong Inst Ecoenvironm Sci & Technol, Guangdong Key Lab Integrated Agroenvironm Pollut, Guangzhou 510650, Peoples R China
[3] Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
[4] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
基金
中国国家自然科学基金;
关键词
North China craton; Fangniushan metasedimentary rocks; Detrital zircon; Geochemistry; Tectonic evolution; ZIRCON U-PB; HF ISOTOPIC COMPOSITIONS; LIAO-JI BELT; TAIHUA COMPLEX; CRUSTAL EVOLUTION; SEDIMENTARY-ROCKS; LU-HF; SUSHUI COMPLEX; TTG GNEISSES; ZHONGTIAO MOUNTAINS;
D O I
10.1016/j.precamres.2020.105789
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
The Fangniushan supracrustal strata located in Xiaoshan area is one of the best-preserved Paleoproterozoic lowgrade metasedimentary units exposed in the southern North China Craton, which is mainly composed of quartzite and feldspar quartzite with minor pebbly quartzite and conglomerates. It unconformably contacts with the underlying Taihua Complex and the overlying Paleoproterozoic Xiong'er Group. Ages of the youngest detrital zircons from the quartzites combined with the formation age of the overlying Xiong'er Group bracket the depositional time of the Fangniushan supracrustal strata at ca. 1.87-1.80 Ga. Low CIA ( < 70), ICV (0.48-1.46) values and high SiO2/Al2O3 (4.1-75.1) ratios for the Fangniushan metasedimentary rocks are suggestive of chemically mature source that experienced weak to moderate chemical weathering in their source areas, which is also supported by the A-CN-K signatures. Detrital zircon U-Pb ages of the Fangniushan metasedimentary rocks yield three populations of similar to 2.00 to 2.24 Ga, similar to 2.25 to 2.40 Ga and similar to 2.50 to 2.88 Ga. REE patterns combined with trace elements characteristics involving La, Th, Zr, Hf, Co and Sc reveal that the Fangniushan metasedimentary rocks dominantly received detritus from felsic sources in the Xiaoshan and adjacent Xiaoqinling, Xiong'ershan and Zhongtiaoshan areas. Taking all these geochronological and geochemical signatures into account, the Fangniushan supracrustal strata was most likely deposited in a retro-arc foreland setting. In combination with previous studies on other Paleoproterozoic metavolcanic-sedimentary sequences, we prefer that the southern NCC might have experienced tectonic regime change from rift to subduction during Paleoproterozoic.
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页数:22
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