LATE CENOZOIC NORMAL FAULTING OF THE QUNGDO'GYANG GRABEN IN THE CENTRAL SEGMENT OF THE CONA-OIGA RIFT, SOUTHEASTERN TIBET

WU Zhong-hai; ZHANG Yong-shuang; HU Dao-gong; ZHAO Xi-tao; YE Pei-sheng

Volume 13 Issue 4

Dec. 2007

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WU Zhong-hai, ZHANG Yong-shuang, HU Dao-gong, et al., 2007. LATE CENOZOIC NORMAL FAULTING OF THE QUNGDO'GYANG GRABEN IN THE CENTRAL SEGMENT OF THE CONA-OIGA RIFT, SOUTHEASTERN TIBET. Journal of Geomechanics, 13 (4): 297-306.

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LATE CENOZOIC NORMAL FAULTING OF THE QUNGDO'GYANG GRABEN IN THE CENTRAL SEGMENT OF THE CONA-OIGA RIFT, SOUTHEASTERN TIBET

1.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
2.
Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China

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Received: 2007-04-15
Published: 2007-12-01

Abstract

Abstract

The Qungdo'gyang graben in Qusum County, Tibet, belongs to the central segment of the NNE-trending Cona-Oiga (or Cona-Sangri)rift zone, which is the only rift located at the easternmost end of the nearly N-S-trending Yadong-Gulu rift zone in southern Tibet.It is a Quaternary semi-graben downfaulted basin formed by extension of the upper crust occurring in the N108-115°E direction after the nearly E-W-trending thrust zone in the study area ceased its activity.The main boundary normal fault controlling the development of the late Quaternary basin is located at the western margin of the basin.It generally strikes NNE and dips E with a length of ～40 km.Displacement measurements and isotopic dating indicate that:this boundary normal fault began activity at ～5 Ma BP; the total cumulative vertical displacement ranged from 2.6 to 2.8 km; and the minimum long-term average throw rate was ～0.5 mm/a.The most rational estimate of the average throw rate since the last maximum glaciation (MIS2)of the fault is 1.2±0.6 mm/a.
- Tibet,
- Quaternary,
- Cona-Oiga rift,
- Qungdo'gyang graben,
- normal faulting

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References(26)

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