Magnetic intencity loss and core diagenesis in long-core samples from the East Cortez and the San Nicolas Basin(California Borderland)
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- Richter Carl
- Ocean Drilling Program, 1000 Discovery Drive, Texas A&M University, College Station
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- Hayashida Akira
- Science and Engineering Research Institute, Doshisha University
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- Guyodo Yohan
- Institut de Physique du Globe de Paris
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- Valet Jean-Pierre
- Institut de Physique du Globe de Paris
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- Verosub Kenneth L.
- Geology Department, University of California
書誌事項
- タイトル別名
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- Magnetic intensity loss and core diagenesis in long-core samples from the East Cortez Basin and the San Nicolas Basin (California Borderland)
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We performed high resolution magnetic measurements on about 180 m of continuous U-channel samples from Sites 1012 (East Cortez Basin) and 1013 (San Nicolas Basin) that were recovered during Ocean Drilling Program Leg 167 to the California Margin. Measurements were made at 1-2 cm intervals from near-complete composite stratigraphic sequences at both of the studied sites with the goal of obtaining high spatial resolution of sediment magnetic properties, including detailed characterization of variations in magnetic mineralogy, concentration, and grain size. The decay of a metastable magnetic mineral or the dissolution of fine-grained magnetite by organic matter reduction had strongly affected both cores, reducing the magnetic intensity to 7%-10% of the initial magnetization. Measurements were carried out ca. 4-6 months after the cores were drilled. Despite the reduced magnetic signal we were able to define a stable characteristic remanence for most of the core. Cyclic variations that were observed over short and long stratigraphic intervals are strongly driven at Earth orbital periodicities and have been used to obtain a detailed age model based on comparison with the insolation record.
収録刊行物
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- Earth, Planets and Space
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Earth, Planets and Space 51 (5), 329-336, 1999
地球電磁気・地球惑星圏学会 、公益社団法人 日本地震学会、特定非営利活動法人 日本火山学会、日本測地学会、日本惑星科学会
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詳細情報
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- CRID
- 1390001206510004096
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- NII論文ID
- 10002792245
- 130003955994
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- NII書誌ID
- AA11211921
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- ISSN
- 18805981
- 13438832
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- NDL書誌ID
- 4796093
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- CiNii Articles
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