气候变化领域集成服务门户(CCPortal): Rock Magnetism of Late Cretaceous to Middle Eocene Strata in the Lesser Himalaya, Western Nepal: Inferences Regarding the Paleoenvironment

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DOI	10.3389/feart.2021.744063
	Rock Magnetism of Late Cretaceous to Middle Eocene Strata in the Lesser Himalaya, Western Nepal: Inferences Regarding the Paleoenvironment
	Khatri, Dhan Bahadur; Zhang, Weilin; Fang, Xiaomin; Meng, Qingquan; Zhang, Tao; Zhang, Dawen; Paudayal, Khum N.
通讯作者	Zhang, WL (通讯作者)
发表日期	2021
EISSN	2296-6463
卷号	9
英文摘要	The growth of the southern piedmont of the Himalayan boundary and its depositional setting has changed since uplift of the Himalaya due to continental Indian-Eurasian collision, which has resulted in variation in magnetic minerals in marine- and terrestrial-facies sediments. In this paper, we utilize rock magnetism data from the late Cretaceous to middle Eocene strata, including the Amile and Bhainskati formations from the Lesser Himalaya (western Nepal), to understand the mechanism controlling magnetic susceptibility (chi). The active tectonics strongly influenced saturation isothermal remanent magnetization (SIRM), HIRM, and hysteresis loops, forming both low-coercivity minerals in sediments with low chi from the terrestrial facies (zones I, IIIA, and V) and high-coercivity minerals in the sediments with high chi from the marine facies (zones II, IIIB and IV). Thermomagnetic kappa-T curves and frequency-dependent chi (chi fd%) values show that sediments with low chi and high chi carry magnetite with coarse non-superparamagnetic (SP) grains and hematite with SP grains, respectively. Comparing the chi data with the lithologic, sedimentary environments, geomorphic features, and sea level data, we propose that low chi values were mainly produced by an increase in terrigenous detrital influx during the regression period of the Tethys Sea, while high chi values formed in marine sediments, which prompted the appearance of ferromagnetic-antiferromagnetic and paramagnetic minerals during the transgression of the Tethys Sea.
关键词	SIWALIK GROUP SEDIMENTS SOUTH ASIAN MONSOON FORELAND BASIN REMANENT MAGNETIZATION POLARITY STRATIGRAPHY ENVIRONMENTAL MAGNETISM DETRITAL GEOCHRONOLOGY CENTRAL INDIA HISTORY AGE
英文关键词	rock magnetism; Cretaceous to Eocene strata; paleoenvironment; transgression and regression; Lesser Himalaya
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000708463800001
来源期刊	FRONTIERS IN EARTH SCIENCE
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/260424
推荐引用方式 GB/T 7714	Khatri, Dhan Bahadur,Zhang, Weilin,Fang, Xiaomin,et al. Rock Magnetism of Late Cretaceous to Middle Eocene Strata in the Lesser Himalaya, Western Nepal: Inferences Regarding the Paleoenvironment[J]. 中国科学院青藏高原研究所,2021,9.
APA	Khatri, Dhan Bahadur.,Zhang, Weilin.,Fang, Xiaomin.,Meng, Qingquan.,Zhang, Tao.,...&Paudayal, Khum N..(2021).Rock Magnetism of Late Cretaceous to Middle Eocene Strata in the Lesser Himalaya, Western Nepal: Inferences Regarding the Paleoenvironment.FRONTIERS IN EARTH SCIENCE,9.
MLA	Khatri, Dhan Bahadur,et al."Rock Magnetism of Late Cretaceous to Middle Eocene Strata in the Lesser Himalaya, Western Nepal: Inferences Regarding the Paleoenvironment".FRONTIERS IN EARTH SCIENCE 9(2021).