Knowledge Management System Of Guangzhou Institute of Geochemistry，CAS
Sun, Qianying1,2; Zhao, Taiping2 ; Zhou, Jingyan1; Wu, Zhuohao1; Zhou, Yanyan3
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| Petrogenesis of the ca. 2.32 Ga low-818O gabbroic diorites and granites in the Xiaoshan area, southern North China Craton: Implications for the early Paleoproterozoic tectonic evolution | |
| Source Publication | PRECAMBRIAN RESEARCH
 |
| ISSN | 0301-9268 |
| 2023 | |
| Volume | 384Pages:22 |
| DOI | 10.1016/j.precamres.2022.106924 |
| Language | 英语 |
| WOS Research Area | Geology |
| Abstract | The database of global zircon ages shows a marked age gap at 2.45-2.2 Ga, which was postulated associated with the global magmatic and plate tectonic "shutdown" or "slowdown". But in recent years, a great deal of - 2.3 Ga magmatism has been identified in the North China Craton (NCC). Nevertheless, tectonic evolutionary scenario of the NCC during early Paleoproterozoic is still in hot debate. This study focuses on the gabbroic diorites and biotite granites in the Xiaoshan area, southern margin of the NCC. They were emplaced at - 2.32 Ga. The gabbroic diorites have low SiO2, high Mg#, Cr, Ni values, and characterized by LREE-enriched, HREE-depleted trends, slightly positive Eu anomalies with pronounced negative Nb-Ta anomalies. Meanwhile, the samples have low-818O value of 2.05-5.35 %o, they show negative zircon epsilon Hf (t) (-5.8 to - 4.1) and whole-rock epsilon Nd (t) (-2.36 to - 1.77) values, with TDM1 ages of 2.81-2.88 Ga and 2.80-2.86 Ga respectively, and crustal assimilation was limited during magma ascent, indicating a lithospheric mantle (CLM) source, which has been refertilized by metasomatic processes. The biotite granites have low 10000 Ga/Al ratios, Zr, Zr + Nb + Ce + Y concentrations, and calculated zircon saturation temperature (697-776 degrees C), belonging to metaluminous I-type granite. Their highly fractionated REE patterns, high Sr/Y and La/Yb ratios, low Dy/Yb and Gd/Yb ratios indicating that they were derived from partial melting of a lower crust source with both garnet and amphibole in the residue. Besides, they have 818O values ranging from 2.41 %o to 5.11 %o, variable zircon epsilon Hf (t) (-1.1 to + 1.4) and whole-rock epsilon Nd (t) (-0.76 to + 0.29) values, implying they were formed mainly by reworking of the pre-existing ancient crust, which was probably triggered by underplated mantle-derived mafic magmas. In combination with previous studies on the great diversity 2.45-2.2 Ga mafic-felsic rock assemblages and their geochemical features, we prefer that the extensional tectonic regime, which can result in thermal anomaly to account for the lithospheric mantle and crustal melting, is reasonable in the early Paleoproterozoic Era, at least for the southern NCC. |
| Keyword | Gabbroic diorites Biotite granites Petrogenesis Early Paleoproterozoic tectonic regime North China Craton |
| WOS ID | WOS:000989753800001 |
| Indexed By | SCI |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.gig.ac.cn/handle/344008/74268 |
| Collection | 中国科学院矿物学与成矿学重点实验室 |
| Corresponding Author | Zhou, Yanyan |
| Affiliation | 1.Minist Ecol & Environm, South China Inst Environm Sci, 7 West St, Guangzhou 510655, Peoples R China 2.Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Mineral & Metallogeny, Guangzhou 510640, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China |
| Recommended Citation GB/T 7714 | Sun, Qianying,Zhao, Taiping,Zhou, Jingyan,et al. Petrogenesis of the ca. 2.32 Ga low-818O gabbroic diorites and granites in the Xiaoshan area, southern North China Craton: Implications for the early Paleoproterozoic tectonic evolution[J]. PRECAMBRIAN RESEARCH,2023,384:22. |
| APA | Sun, Qianying,Zhao, Taiping,Zhou, Jingyan,Wu, Zhuohao,&Zhou, Yanyan.(2023).Petrogenesis of the ca. 2.32 Ga low-818O gabbroic diorites and granites in the Xiaoshan area, southern North China Craton: Implications for the early Paleoproterozoic tectonic evolution.PRECAMBRIAN RESEARCH,384,22. |
| MLA | Sun, Qianying,et al."Petrogenesis of the ca. 2.32 Ga low-818O gabbroic diorites and granites in the Xiaoshan area, southern North China Craton: Implications for the early Paleoproterozoic tectonic evolution".PRECAMBRIAN RESEARCH 384(2023):22. |
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