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- W2022702422 abstract "• AMS used to solve the ambiguity on the tectonic or sedimentary origin of magnetic lineation . • Comparison of magnetic fabric with available tectonic and sedimentary data. • The magnetic lineation in the Shemshak Group sandstones is tectonically originated. • AMS is a valuable tool to study deformation processes in sedimentary rocks. The magnetic lineation observed in “undeformed” sedimentary units has been interpreted either as an indication of paleoflow direction, or as a result of tectonic overprint which progressively modifies the original sedimentary fabric related to compactional processes. Distinguishing between the two processes is not always easy. In fact, most studies of the Anistropy of Magnetic Susceptibility (AMS) of “undeformed” sequences have been carried out in fine-grained sediments from foredeep sequences, which are characterized by sedimentary flow directions which are almost parallel to the main deformation structures, like thrust faults and folds. In the Alborz Mts., the Upper Triassic–Lower Jurassic Shemshak Group was deposited in a foreland to molassic basin of the Eo-Cimmerian orogen and now outcrops in several folds which are oriented parallel to the curved chain. Paleoflow directions are generally oblique to the main tectonic structures , being directed SSW to SSE and showing negligible changes in their orientation along the Alborz Mountains. We have, therefore, the opportunity to distinguish between tectonic- or sedimentary-related origins of the magnetic lineation. The AMS results show that magnetic lineations of the Shemshak Group are oriented almost parallel to the main fold axes and thrust structures, which follow the Alborz Mts. curved trend, suggesting that magnetic lineation is of tectonic origin in fine to medium grained, mostly massive sandstones, and confirming that AMS is a valuable tool to study deformation processes in sedimentary rocks." @default.
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- W2022702422 date "2013-09-01" @default.
- W2022702422 modified "2023-09-26" @default.
- W2022702422 title "A tectonic origin of magnetic fabric in the Shemshak Group from Alborz Mts. (northern Iran)" @default.
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- W2022702422 doi "https://doi.org/10.1016/j.jseaes.2013.05.014" @default.
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