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Magnetic minerals and magnetic properties of the Siwalik Group sediments of the Karnali river section in Nepal

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Title: Magnetic minerals and magnetic properties of the Siwalik Group sediments of the Karnali river section in Nepal
Authors: Gautam, Pitambar Browse this author →KAKEN DB
Hosoi, Azumi Browse this author
Regmi, Kamal Raj Browse this author
Khadka, Dharma Raj Browse this author
Fujiwara, Yoshiki Browse this author
Issue Date: 1-May-2000
Publisher: Terra Scientific Publishing Company
Journal Title: Earth, Planets and Space
Volume: 52
Issue: 5
Start Page: 337
End Page: 345
Abstract: Sandstones and siltstones collected from the Siwalik molasse sequence (~16 to 5 Ma) of the Karnali river section have been studied for their magnetic properties. Behavior of the specimens during demagnetization (of theNRMand IRM) and magnetic susceptibility vs. temperature data suggest that goethite, maghemite/magnetite, and hematite are the main magnetic minerals in the section. Goethite, carrying a recent component, is the dominant magnetic mineral in the fine-grained lithologies from the lower part. Maghemite and magnetite, which also carry a secondary remanence, occur in the sandstones from the upper part. Hematite, mainly of detrital origin, is present in the whole sequence. The magnetic fabric is defined by mainly oblate AMS ellipsoids and a low degree of anisotropy (P' < 1.20). The magnetic lineations (declinations: 75°-130° or 245°-310°; peak orientation: 290°/2.8°) are subparallel to the fold axes/bedding strikes/thrust fronts (WNW-ESE). The initial sedimentary-compactional fabric has been overprinted by a secondary tectonic fabric, which was probably induced by mild deformation active in the compressive tectonic setting.
Type: article
Appears in Collections:創成研究機構 (Creative Research Institution) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: Gautam Pitambar

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