气候变化领域集成服务门户(CCPortal): Preliminary paleomagnetic results of the Early-Middle Silurian rocks from North Qiangtang Terrane, and its tectonic implications

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DOI	10.6038/cjg2022P0065
	Preliminary paleomagnetic results of the Early-Middle Silurian rocks from North Qiangtang Terrane, and its tectonic implications
	Jiang Nan; Wu HanNing; Li YuYu; Wei BiTian; Zhou YaNan; Zhang WeiJie; Gao Yang; Yu Liang; Wu JiaKun; Huo FeiFei; Liu YuChun; Wang BaoFeng; Cheng Xin
通讯作者	Cheng, X (通讯作者)
发表日期	2022
ISSN	0001-5733
起始页码	1057
结束页码	1070
卷号	65 期号:3
英文摘要	In order to reconstruct the Early-Middle Silurian paleogeographic position of the North Qiangtang Terrane (NQT) and to further discuss its origin, we present preliminary paleomagnetic data (10 sites, 125 samples) from the Early-Middle Silurian Longmu Co Formation sedimentary rocks at the Longmu Co area (34. 4 degrees N, 80. 3 degrees E) of the NQT. Petrography and rock magnetism reveals that magnetite is the dominant magnetic carrier in limestone samples from the Longmu Co Formation. Systematic thermal and alternating field demagnetization curves show a feature of single or two components, while the direction of the single component is consistent with that of the high-temperate/field component that decays toward the origin stably. This stable characteristic remanent magnetization (ChRM) passes the C-class reversal test at the sample level. The tilt-corrected mean direction for the Early-Middle Silurian rocks from the NQT is D-s = 321. 8 degrees, I-s = 41. 7 degrees, k(s)= 31. 1, alpha(95) = 10. 1 degrees, N= 8, which yields a corresponding paleomagnetic pole at -55. 3 degrees N, 163. 3 degrees E (dp/dm=7. 6 degrees/12. 4 degrees). This paleopole does not resemble to younger paleopoles from the NQT, indicating that the ChRM is very likely to be the primary remanence. Our results, together with the evidence of geology, imply that the NQT was located in the low latitudes of the Southern Hemisphere (24. 0 degrees S) during the Early-Middle Silurian times, in which, the NQT may be closely related to the South China Block and located in the paleo-ocean on the northern side of the India Plate of Gondwana.
关键词	DETRITAL ZIRCONS YANGTZE BLOCK SOUTH CHINA RED-BEDS TIBET CONSTRAINTS EVOLUTION DISCOVERY GEOGRAPHY GONDWANA
英文关键词	North Qiangtang Terrane; Early-Middle Silurian; Paleomagnetism; Reversal test; Paleomagnetic pole
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000769779800020
来源期刊	CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260728
推荐引用方式 GB/T 7714	Jiang Nan,Wu HanNing,Li YuYu,et al. Preliminary paleomagnetic results of the Early-Middle Silurian rocks from North Qiangtang Terrane, and its tectonic implications[J]. 中国科学院青藏高原研究所,2022,65(3).
APA	Jiang Nan.,Wu HanNing.,Li YuYu.,Wei BiTian.,Zhou YaNan.,...&Cheng Xin.(2022).Preliminary paleomagnetic results of the Early-Middle Silurian rocks from North Qiangtang Terrane, and its tectonic implications.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,65(3).
MLA	Jiang Nan,et al."Preliminary paleomagnetic results of the Early-Middle Silurian rocks from North Qiangtang Terrane, and its tectonic implications".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 65.3(2022).