Magnetic components contributing to the NRM of Middle Siwalik red beds |
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Authors: | Lisa Tauxe Dennis V Kent Neil D Opdyke |
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Institution: | 1. Department of Geological Sciences of Columbia University, Palisades, NY 10964 U.S.A.;2. Lamont-Doherty Geological Observatory, Palisades, NY 10964 U.S.A. |
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Abstract: | The components of the NRM in Middle Siwalik red beds are carried by two phases of hematite, a red pigment phase and a specular hematite phase. We present evidence in the form of a conglomerate test that the specularite phase carries a remanence acquired during or shortly after deposition. The red pigment, however, post-dates deposition, in many cases by at least one reversal boundary. This secondary component has a higher coercivity but a lower blocking temperature in these rocks and can therefore be selectively removed by thermal demagnetization to reveal a primary magnetization useful for magnetostratigraphic studies. |
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