气候变化领域集成服务门户(CCPortal): Magnetostratigraphy of the middle-upper Jurassic sedimentary sequences at Yanshiping, Qiangtang Basin, China

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DOI	10.1093/gji/ggw199
	Magnetostratigraphy of the middle-upper Jurassic sedimentary sequences at Yanshiping, Qiangtang Basin, China
	Song, Chunhui; Zeng, Yongyao; Yan, Maodu; Wu, Song; Fang, Xiaomin; Bao, Jing; Zan, Jinbo; Liu, Xifang
通讯作者	Song, CH (通讯作者)
发表日期	2016
ISSN	0956-540X
EISSN	1365-246X
起始页码	1847
结束页码	1863
卷号	206 期号:3
英文摘要	A series of important geological events occurred in the Tibetan Plateau area during the Jurassic, such as the collision of the Lhasa and Qiangtang Terranes, the closure of the Meso-Tethyan Ocean, the opening of the Neo-Tethyan Ocean and the cessation of the mega-monsoon. The similar to 3000 m thick Jurassic sedimentary sequence in the Qiangtang Basin on the central Tibetan Plateau, which is called the Yanshiping (YSP) Group, recorded these geological events. However, the chronology of the sequence is surprisingly poorly constrained. Here, we perform a detailed palaeomagnetic analysis on the similar to 1060 m thick middle and upper portions of the YSP Group (the Xiali and Suowa Formations) in the YSP section of the eastern Qiangtang Basin. Three bivalve zones at stratigraphic intervals of similar to 40-140, 640-800 and 940-1040 m are identified, which yield a Bathonian-Callovian age for the Lower Xiali Fm., a Callovian-Oxfordian age for the Lower Suowa Fm. and an Oxfordian-Kimmeridgian age for the Upper Suowa Fm. A total of 544 oriented palaeomagnetic samples were collected from the section. By combining thermal and alternating field demagnetizations, clear characteristic remanent magnetization (ChRM) directions are isolated for most of the samples. The robust ChRM directions pass fold and reversals tests, which support the primary nature of the ChRMs and yield a palaeopole at 76.8A degrees N/297.2A degrees E (dp = 2.2A degrees, dm = 3.7A degrees). A total of 27 normal and 26 reversed polarity zones were successfully recorded in the section. Combined with fossil age constraints, results suggest that the section is plausibly composed of a Callovian-Early Kimmeridgian age sedimentary sequence.
关键词	RESOLUTION MAGNETO STRATIGRAPHY NE TIBETAN PLATEAU TECTONIC EVOLUTION DINOFLAGELLATE CYSTS QINGHAI PROVINCE NORTHERN TIBET AREA GROWTH BIOSTRATIGRAPHY DEFORMATION
英文关键词	Magnetostratigraphy; Palaeomagnetism applied to tectonics; Rock and mineral magnetism; Asia
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000384650400028
来源期刊	GEOPHYSICAL JOURNAL INTERNATIONAL
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/258743
推荐引用方式 GB/T 7714	Song, Chunhui,Zeng, Yongyao,Yan, Maodu,et al. Magnetostratigraphy of the middle-upper Jurassic sedimentary sequences at Yanshiping, Qiangtang Basin, China[J]. 中国科学院青藏高原研究所,2016,206(3).
APA	Song, Chunhui.,Zeng, Yongyao.,Yan, Maodu.,Wu, Song.,Fang, Xiaomin.,...&Liu, Xifang.(2016).Magnetostratigraphy of the middle-upper Jurassic sedimentary sequences at Yanshiping, Qiangtang Basin, China.GEOPHYSICAL JOURNAL INTERNATIONAL,206(3).
MLA	Song, Chunhui,et al."Magnetostratigraphy of the middle-upper Jurassic sedimentary sequences at Yanshiping, Qiangtang Basin, China".GEOPHYSICAL JOURNAL INTERNATIONAL 206.3(2016).