气候变化领域集成服务门户(CCPortal): High-resolution paleomagnetic and sedimentological investigations on the Tibetan Plateau for the past 16 ka cal BPThe Tangra Yumco record

CCPortal

DOI	10.1002/2015GC006023
	High-resolution paleomagnetic and sedimentological investigations on the Tibetan Plateau for the past 16 ka cal BPThe Tangra Yumco record
	Henkel, Karoline; Haberzettl, Torsten; St-Onge, Guillaume; Wang, Junbo; Ahlborn, Marieke; Daut, Gerhard; Zhu, Liping; Maeusbacher, Roland
通讯作者	Henkel, K (通讯作者)
发表日期	2016
ISSN	1525-2027
起始页码	774
结束页码	790
卷号	17 期号:3
英文摘要	The spatial distribution of paleomagnetic secular variation (PSV) records on the Tibetan Plateau and adjacent areas covering the Holocene and Late Glacial is sparse. In order to reconstruct PSV in this area, a piston core covering the past 17.5 ka cal B.P. retrieved from Lake Tangra Yumco, southern-central Tibetan Plateau, was analyzed. In the laminated sediments, several event layers are intercalated. Those were identified by sedimentological analysis and excluded for age-depth modeling and interpretation. Paleomagnetic measurements on u-channels reveal two contrasting core sections. The lower section (dated to 17.5-15.9 ka cal B.P.) is very coarse grained (up to 220 mu m) and characterized by low intensities (0.8 mA m(-1)) and high maximum angular deviation values (mean 25 degrees), making it unsuitable for PSV reconstruction. In contrast, the upper unit (dated to <15.9 ka cal B.P.) yields ideal properties with a well-defined magnetization carried by low-coercivity minerals in the pseudo single domain state making those younger sediments a proper record for PSV studies. The robustness of the PSV reconstruction for the past 3000 years is highlighted by a comparable inclination and declination pattern of three short sediment cores (2 m) from Tangra Yumco. On a regional scale, the obtained inclination signal for the past 15.9 ka cal B.P. is in good agreement with the Lake Baikal record (3000 km to the North), PSV stack for East Asia, as well as with predictions of geomagnetic field models. This study is a step forward in constructing a PSV reference curve for central Asia.
关键词	POSTDEPOSITIONAL REMANENT MAGNETIZATION GEOMAGNETIC SECULAR VARIATION RELATIVE PALEOINTENSITY LACUSTRINE SEDIMENTS LAKE-SEDIMENTS SOUTHERN TIBET GRAIN-SIZE FIELD CHINA CO
英文关键词	paleomagnetic secular variations (PSV); magnetostratigraphy; Tibetan Plateau; lake sediments; Tangra Yumco; inclination
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000375144700007
来源期刊	GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
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/258767
推荐引用方式 GB/T 7714	Henkel, Karoline,Haberzettl, Torsten,St-Onge, Guillaume,et al. High-resolution paleomagnetic and sedimentological investigations on the Tibetan Plateau for the past 16 ka cal BPThe Tangra Yumco record[J]. 中国科学院青藏高原研究所,2016,17(3).
APA	Henkel, Karoline.,Haberzettl, Torsten.,St-Onge, Guillaume.,Wang, Junbo.,Ahlborn, Marieke.,...&Maeusbacher, Roland.(2016).High-resolution paleomagnetic and sedimentological investigations on the Tibetan Plateau for the past 16 ka cal BPThe Tangra Yumco record.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,17(3).
MLA	Henkel, Karoline,et al."High-resolution paleomagnetic and sedimentological investigations on the Tibetan Plateau for the past 16 ka cal BPThe Tangra Yumco record".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 17.3(2016).