NDLI: Magnetic records of Core MD77-181 in the Bay of Bengal and their paleoenvironmental implications

Content Provider	Springer Nature Link
Author	Li, Haiyan Zhang, Shihong Fang, Nianqiao Wang, Hongqiang
Copyright Year	2006
Abstract	High-resolution environmental magnetic measurements were carried out on Core MD77-181 in the Bay of Bengal, including magnetic susceptibility, anhysteretic remanent magnetization, isothermal remanent magnetization of all samples, and temperature-dependence of magnetic susceptibilities and magnetic hysteresis parameters of representative samples. The results suggest that (1) the magnetic mineral assemblage of the upper 9.82 m sediments (corresponding to the last 160 ka) is dominated by pseudo-single domain magnetite, with more abundant coarse grains in glacial periods than in interglacial periods; (2) the uppermost 6.50 m of sediments (corresponding to the last 70 ka) shows significant temporal variations in grain sizes of magnetic minerals, possibly reflecting the teleconnection between variations of the Indian summer monsoon and rapid cold events of the North Atlantic (Heinrich events); (3) the sediments below 9.82 m are dominated by paramagnetic minerals (probably including pyrites), suggesting reductive diagenesis. The magnetic records of Core MD77-181 are comparable to those of Core MD77-180 in the Bay of Bengal, and ODP Hole 722B in the Arabian Sea. This study suggests that the paleoceanographic event at ∼160 ka significantly changed the redox state of the northern Indian Ocean, from a reductive environment before the event to an oxic or suboxic environment after the event.
Starting Page	1884
Ending Page	1893
Page Count	10
File Format	PDF
ISSN	10016538
Journal	Chinese Science Bulletin
Volume Number	51
Issue Number	15
e-ISSN	18619541
Language	English
Publisher	Science in China Press
Publisher Date	2006-01-01
Publisher Place	Beijing
Access Restriction	Subscribed
Subject Keyword	environmental magnetism reductive diagenesis northern Indian Ocean ∼160 ka Science Chemistry/Food Science Geosciences Life Sciences Physics Engineering
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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