Rock magnetism and paleomagnetism of Late Cretaceous sedimentary rocks in borehole CCSD-LK-I (Shandong province) and implications for the feasibility of core orientation recovery using natural remanent magnetization

doi:10.6038/cjg20171215

	Rock magnetism and paleomagnetism of Late Cretaceous sedimentary rocks in borehole CCSD-LK-I (Shandong province) and implications for the feasibility of core orientation recovery using natural remanent magnetization
	Han Fei 1,2; Qin Hua-Feng 1,3; Ji Qiang 4; Sun Jing-Peng 1,2; Deng Cheng-Long 1,2,3; Pan Yong-Xin 1,2
刊名	CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
	2017-12-01
卷号	60 期号:12 页码:4730-4740
关键词	Ccsd-lk-i Chrm Vrm Core Orientation Recovery
ISSN号	0001-5733
DOI	10.6038/cjg20171215
文献子类	Article
英文摘要	The paleomagnetic method has been commonly used to orient the un-oriented borehole core, but its feasibility and reliability remain unclear due to the complexity of remanence. This study investigated the feasibility of orientation of the Cretaceous Continent Scientific Drilling (CCSD) borehole LK-I in the Jiaolai Basin, Shandong Province, using the characteristic remanent magnetization (ChRM) and viscous remanent magnetization (VRM). In total 335 sedimentary rock samples from CCSD LK-I core (depth 768. 9 similar to 1112. 3 m) were measured, including stepwise thermal demagnetization of the natural remanent magnetization (NRM), anisotropy of magnetic susceptibility (AMS), progressive thermal demagnetization of three-component isothermal remanent magnetizations (IRM), hysteresis loops, backfield demagnetization curves and the first order reverse curves (FORCs). Results show that magnetite and hematite are the dominant magnetic minerals in the measured samples. The principal axes of AMS ellipsoid K-1 and K-2 are nearly parallel to the horizontal plane, while the K-3 axes are perpendicular to. the horizontal plane, which indicates the sedimentary rocks preserved primary fabrics. After being adjusted by the declination of ChRM (also considering local tectonic rotation), the mean direction of VRM is D-vRm = -1.3 degrees, I-vRm = 59.6 degrees by Fisher statistics, which is in accordance with the present local geomagnetic field (D = -6.7 degrees,I = 53.9 degrees). Using the same adjustment and statistic methods, the mean direction of K-1 is Dch-k1 = 349.2 degrees, Ich-k1 = 0.7 degrees. Collectively, this work suggested that the direction of ChRM can be used to recover the orientation the borehole core of CCSD-LK-I.
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000418626400015
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/82320]
专题	中国科学院地质与地球物理研究所
通讯作者	Pan Yong-Xin
作者单位	1.Chinese Acad Sci, Paleomagnetism & Geochronol Lab, Key Lab Earth & Planetary Phys, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Sch Earth Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 4.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China
推荐引用方式 GB/T 7714	Han Fei,Qin Hua-Feng,Ji Qiang,et al. Rock magnetism and paleomagnetism of Late Cretaceous sedimentary rocks in borehole CCSD-LK-I (Shandong province) and implications for the feasibility of core orientation recovery using natural remanent magnetization[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2017,60(12):4730-4740.
APA	Han Fei,Qin Hua-Feng,Ji Qiang,Sun Jing-Peng,Deng Cheng-Long,&Pan Yong-Xin.(2017).Rock magnetism and paleomagnetism of Late Cretaceous sedimentary rocks in borehole CCSD-LK-I (Shandong province) and implications for the feasibility of core orientation recovery using natural remanent magnetization.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,60(12),4730-4740.
MLA	Han Fei,et al."Rock magnetism and paleomagnetism of Late Cretaceous sedimentary rocks in borehole CCSD-LK-I (Shandong province) and implications for the feasibility of core orientation recovery using natural remanent magnetization".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 60.12(2017):4730-4740.