Journal
CHINESE SCIENCE BULLETIN
Volume 59, Issue 22, Pages 2764-2775Publisher
SCIENCE PRESS
DOI: 10.1007/s11434-014-0166-0
Keywords
Rock magnetism; Greigite; Continental shelf environment; South Yellow Sea
Categories
Funding
- Project of State Oceanic Administration, China [908-01-BC15]
- National Natural Science Foundation of China [41374073, 41025013, 40821091]
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Magnetic minerals in sediments of the continental shelf are sensitive to environmental changes. Therefore, to determine the exact phases of magnetic minerals is the prerequisite to investigate the paleoenvironmental significances. In this study, a comprehensive rock magnetic investigation, coupled with mineralogical studies, was carried out on the long core NHH01 (with a length of 125.64 m) from the central continental shelf of the South Yellow Sea. Single-domain greigite was identified as the dominant magnetic carrier in sediments between 44.90 and 51.80 m, and terrigenous magnetite is the major magnetic phase in the adjacent layers. The existence of greigite unambiguously indicates an anoxic environment. We tentatively interpreted that such an environment could be formed by the fast sea level changes, long-existing of the cold eddies during warm stages, or in a lake which might be related to locally tectonic uplifting. Therefore, the occurrence of the thick-layer greigite could supply a new perspective to paleoenvironmental or even tectonic studies.
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