High-resolution analysis of early diagenetic effects on magnetic;minerals in post-middle-Holocene continental shelf sediments from the;Korea Strait

doi:10.1029/2003JB002813

CORC > 中国地质调查局 > 中国地质调查局 > 中国地质调查局青岛海洋地质研究所

	High-resolution analysis of early diagenetic effects on magnetic;minerals in post-middle-Holocene continental shelf sediments from the;Korea Strait
	Liu, J 5; Zhu, RX ; Roberts, AP ; Li, SQ ; Chang, JH
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
	2004
卷号	109 期号:B3;AR B03103 页码:-
关键词	magnetite diagenesis continental shelf sediments rock magnetism post-middle Holocene Korea Strait
ISSN号	0148-0227
DOI	10.1029/2003JB002813
英文摘要	Two studied sediment cores from the Korea Strait contain mud sequences ( 14 m and 32.62 m in thickness) that were deposited during the last 6,000 years. The sediments have uniform lithology and geochemical properties, however, marked down-core changes in magnetic properties suggest that diagenesis has significantly impacted the magnetic properties. An expanded view of early diagenetic reactions that affect magnetic mineral assemblages is evident in these rapidly deposited continental shelf sediments compared to deep-sea sediments. The studied sediments are divided into four descending intervals, based on magnetic property variations. Interval 1 is least affected by diagenesis and has the highest concentrations of detrital magnetite and hematite, and the lowest solid-phase sulfur contents. Interval 2 is characterized by the presence of paramagnetic pyrite and sharply decreasing magnetite and hematite concentrations, which suggest active reductive dissolution of detrital magnetic minerals. Interval 3 is marked by a progressive loss of hematite with depth, and coincides with the minimum magnetite concentration. Interval 4 has an increasing down-core enhancement of authigenic greigite, which apparently formed at depths of 3-30 m below the sediment-water interface due to arrested pyritization reactions. These results indicate delays of thousands of years for acquisition of magnetizations carried by greigite, which suggests that studies of geomagnetic field behavior from greigite-bearing continental shelf sediments should be conducted with care. Also, virtually complete destruction of detrital magnetic minerals at depth suggests that magnetic studies of rapidly deposited shelf sediments are unlikely to provide a meaningful signature associated with syndepositional environmental processes.
学科主题	第四纪地质
WOS关键词	ANOXIC MARINE-SEDIMENTS ; SEA-LEVEL CHANGES ; HEMIPELAGIC SEDIMENTS ; YELLOW SEA ; ENVIRONMENTAL MAGNETISM ; HYSTERESIS PROPERTIES ; SOUTHWESTERN ; TAIWAN ; BEARING SEDIMENTS ; ROCK MAGNETISM ; GREIGITE FE3S4
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000220433900003
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/37655]
专题	中国地质调查局青岛海洋地质研究所
作者单位	1.China Geol Survey, Qingdao Inst Marine Geol, Qingdao 266071, Peoples R China. 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China. 3.Univ Southampton, Southampton Oceanog Ctr, Sch Ocean & Earth Sci, Southampton SO14 3ZH, Hants, England. 4.Korean Inst Geol Min & Mat, Taejon 305350, South Korea. 5.中国地质调查局青岛海洋地质研究所
推荐引用方式 GB/T 7714	Liu, J,Zhu, RX,Roberts, AP,et al. High-resolution analysis of early diagenetic effects on magnetic;minerals in post-middle-Holocene continental shelf sediments from the;Korea Strait[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2004,109(B3;AR B03103):-.
APA	Liu, J,Zhu, RX,Roberts, AP,Li, SQ,&Chang, JH.(2004).High-resolution analysis of early diagenetic effects on magnetic;minerals in post-middle-Holocene continental shelf sediments from the;Korea Strait.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,109(B3;AR B03103),-.
MLA	Liu, J,et al."High-resolution analysis of early diagenetic effects on magnetic;minerals in post-middle-Holocene continental shelf sediments from the;Korea Strait".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 109.B3;AR B03103(2004):-.