Preliminary paleomagnetic results from the Upper Carboniferous of Uliastai Block, Inner Mongolia, China

Details Preliminary paleomagnetic results from the Upper Carboniferous of Uliastai Block, Inner Mongolia, China Preliminary paleomagnetic results from the Upper Carboniferous of Uliastai Block, Inner Mongolia, China

Nov 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24.2833c&link_type=abstract

Geophysical Research Letters, Volume 24, Issue 22, p. 2833-2836

Mathematics

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Tectonophysics: Continental Tectonics-General, Information Related To Geographic Region: Asia, Information Related To Geologic Time: Paleozoic

Scientific paper

Paleomagnetic samples from five sites from the Upper Carboniferous Baoligemiao Formation of the Uliastai block (117°10'E, 45°30'N) preserve stable normal and reversed magnetizations, with mean D=138.3°, I=-47.8°, a95=9.7°, k=9.9. IRM acquisition and thermal demagnetization of IRM indicate that the magnetization in these pyroclastic sediments is predominantly carried by magnetic, however, higher coercivity minerals contribute to the remnant magnetization as well. The pole position (53.4°N, 14.8°E) derived from these results is near those of Sino-Korea and central Mongolia but significantly different from that of Siberia, suggesting that the Uliastai was not a Siberian-related fragment as traditionally proposed. Instead the block, along with the Mongolia and Sonid blocks, may have moved as a series of north-facing arc terranes (frontal and remnant arcs) of the Sino-Korean continent during the Late Paleozoic, possibly an ancient analogue of the Southeast Asian archipelago today.

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