The Paleomagnetism and Rock Magnetism of Cave and Karst Deposits
Published:January 01, 1993
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Alf G. Latham, Derek C. Ford, 1993. "The Paleomagnetism and Rock Magnetism of Cave and Karst Deposits", Applications of Paleomagnetism to Sedimentary Geology, Djafar M. Aïssaoui, Donald F. McNeill, Neil F. Hurley
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Studies of the paleomagnetism and rock magnetism of speleothems have shown that their natural remanent magnetizations (NRMs) are either detrital remanent magnetizations (DRMs), chemical remanent magnetizations (CRMs), or a mixture of both. The DRM arises from magnetic particles deposited by cave floods, and the evidence is unequivocal. The CRM results from organic-chelated iron or bacteria, and the evidence is circumstantial. The frequent presence of organic materials in speleothems is easily demonstrated, and they may be soluble, insoluble, or both. Organics account for the color of many speleothems. Whether the remanence is DRM or CRM, the signal is contemporaneous with the precipitation of the host calcite matrix and is measurably free of depositional inclination error effects. It is suggested that the studies summarized here have relevance for the timing of remanence in diagenetic limestone calcite, faithfulness of this remanence in its alignment along the ambient magnetic field at the site, and to hydrocarbon-magnetite associations in carbonate rocks.
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Applications of Paleomagnetism to Sedimentary Geology
Applications of Paleomagnetism to Sedimentary Geology - Based on the 1991 SEPM Research Symposium, the results are directed towards bringing the disciplines of Paleomagnetism and sedimentary geology closer together. Advances in the field of sedimentary geology will likely result from continued development of new ideas, questioning of old dogma, and, most importantly, providing means for testing these new hypotheses. It is hoped that the union of these two disciplines will help address many fundamental geological questions, such as the perennial problems of precise age-dating, stratigraphic correlation and geometries, understanding the timing and nature of post-depositional diagenetic fabrics, and the intriguing relationship between hydrocarbons and magnetization. The reader will find an unusual diversity of research topics presented in this volume. This diversity serves as a testimony to the potential applications awaiting the sedimentary geologist willing to explore these new paleomagnetic tools.