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Abstract:
Tibetan Plateau, whose average elevation is more than 4500 m, is joined the basin or plain whose elevation is less than 2000 m through the steep slope relief of the edge of the Tibetan Plateau. When, how does the steep slope relief formed? Nine Apatite fission track ages and length of the steep slope relief from the main thrust fault hanging wall in the middle of the northern margin of west Kunlun Mountains are analyzed in this paper, showed that fission track ages from the steep slope relief area of elevation 3900~4635 m are ranging from 6.2±1.4 Ma ~0.9±0.3 Ma, fission track ages show as "up new under old" anti-order distribution. Thermal history modeling shows multi-stage uplifting and exhumation of ~5 Ma, ~3~2 Ma, ~2~1 Ma and since ~1 Ma. Combined with previous studies results and geological observations, think that steep slop relief what we now see in the northwestern margin of Tibetan Plateau is overstep propagation thrust results of west Kunlun thrust fault system since late Miocene, it experienced the multi-stage overstep propagation thrusting movement of ~8 Ma, ~5Ma, ~3~2 Ma, ~2~1 Ma and since~1 Ma. It provides an important chronology constraints for age and causes of the steep slope relief forming in the margin of the Tibetan Plateau and uplifting of age and type of Tibetan Plateau.
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Scientia Geologica Sinica
ISSN: 0563-5020
CN: 11-1937/P
Year: 2010
Issue: 4
Volume: 45
Page: 930-943
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SCOPUS Cited Count:
ESI Highly Cited Papers on the List: 0 Unfold All
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Chinese Cited Count:
30 Days PV: 2
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