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首页> 外文期刊>Earth, planets and space: EPS >Magnetic minerals and magnetic properties of the Siwalik Group sediments of the Karnali river section in Nepal
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Magnetic minerals and magnetic properties of the Siwalik Group sediments of the Karnali river section in Nepal

机译：尼泊尔卡纳利河段Siwalik群沉积物的磁性矿物和磁性

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摘要

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 the NRM and 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.
机译：研究了从卡纳利河段的Siwalik糖蜜序列（〜16至5 Ma）中收集的砂岩和粉砂岩的磁性。样品在退磁（NRM和IRM）过程中的行为以及磁化率与温度的关系数据表明，针铁矿，磁赤铁矿/磁铁矿和赤铁矿是该断面的主要磁性矿物。针铁矿具有较新的成分，是下部细粒岩性中的主要磁性矿物。磁赤铁矿和磁铁矿也具有次生剩磁，从上部出现在砂岩中。在整个序列中都存在赤铁矿，主要是碎屑来源的。磁性织物主要由扁圆形的AMS椭圆形和低各向异性（P'<1.20）定义。磁线（倾斜度：75°-130°或245°-310°;峰方向：290°/ 2.8°）与折叠轴/层理走向/冲断锋（WNW-ESE）近乎平行。最初的沉积-压实构造已被次生构造织物套印，这可能是由于在压缩构造环境中活跃的轻微变形所致。

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