J4 ›› 2011, Vol. 41 ›› Issue (5): 1466-1475.

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Tectonic-Thermo Events of Northern Tibetan Plateau: Evidence from Detrital Apatite Fission Track Data in Western Qaidam Basin

GAO Jun-ping1,2,FANG Xiao-min3,SONG Chun-hui1,2,LI Sheng-xi2,XUE Jian-ping2   

  1. 1.College of Resources and Environment| Lanzhou University| Lanzhou730000| China；
    2.Key Laboratory of Western China’s Environmental Systems|Ministry of Education| Lanzhou University| Lanzhou730000|China；
    3.Institute of Tibetan Plateau Research| Chinese Academy of Sciences|Beijing100085| China
  • Received:2010-12-12 Online:2011-09-26 Published:2011-09-26

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Abstract:

Much thick Cenozoic were deposited in the western Qaidam basin(WQB)，in which not only Qinghai oil field located, but the sediments that close to Altyn Tagh fault and northern marginal fault of Kunlunshan also preserves many information of basin-orogen coupling. The study of detrital apatite fission-track (AFT) data suggests that studying area has experienced an early (32-3 Ma or 4 Ma) of the compress-depressive and late (<3 Ma or 4 Ma) rapid compress-uplift of two periods. Farther analysis showed that these periods can be divided into poly-stages of tectonic-thermal processes in WQB and its around mountains since Late Cretaceous，in which Late Mesozoic (116-68 Ma)，Mesozoic-Cenozoic (ca 68-62 Ma)，Early-Middle Eocene (50-44 Ma)，Late Eocene(ca 36 Ma)，Early Oligocene (ca 30 Ma)，Miocene (ca 22，16，12 Ma) and PlioceneQuaternary (3 Ma or 4 Ma，1 Ma) stages. The AFT data reveals studying area rapid uplift only at 28.4 Ma，19.52 Ma，14.21 Ma and 8.76 Ma，but compression，tilting-uplift-denudation at margin of the basin in about 30 Ma，21.8 Ma，16.38 Ma and 7.38 Ma，corresponds to multiple thrusting of thrusts in WQB.

Key words: Qaidam basin, apatite, fission track, Cenozoic, tectonic-thermal event

CLC Number: 

  • P588.244
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