| Institute of Geomechanics, Chinese Academy of Geological Sciences | Host |
| Citation: |
WU Zhong-hai, ZHANG Yong-shuang, HU Dao-gong, ZHAO Xi-tao, YE Pei-sheng. LATE CENOZOIC NORMAL FAULTING OF THE QUNGDO'GYANG GRABEN IN THE CENTRAL SEGMENT OF THE CONA-OIGA RIFT, SOUTHEASTERN TIBET[J]. Journal of Geomechanics, 2007, 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
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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.
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Keywords:
- Tibet /
- Quaternary /
- Cona-Oiga rift /
- Qungdo'gyang graben /
- normal faulting
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References
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WU Zhong-hai, ZHANG Yong-shuang, HU Dao-gong, ZHAO Xi-tao, YE Pei-sheng. LATE CENOZOIC NORMAL FAULTING OF THE QUNGDO'GYANG GRABEN IN THE CENTRAL SEGMENT OF THE CONA-OIGA RIFT, SOUTHEASTERN TIBET[J]. Journal of Geomechanics, 2007, 13(4): 297-306.
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Figure 1.
ETM remote sensing image interpretation of the Qungdo'gyang graben and its adjacent areas, location of the study area and extensional orientation of the graben
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Figure 2.
Geological-topographical cross-section of the Qingduojiang graben
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Figure 3.
Fault triangle facets along the front of a mountain NW of maintenance station 20 in the Qungdo'gyang graben (looking toward SW)
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Figure 4.
Friction surface of a piedmont normal fault and striations on it (looking toward W; localityⅠ in Fig. 1)
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Figure 5.
Vertical offset of the glacial lateral moraine ridge fo rmed in the last maximum glaciation by the piedmont normal fault (looking toward SW; locality Ⅲ in Fig. 1)
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Figure 6.
Topographic sections of Holocene fault scarps offset along the western side of the Qungdo'gyang graben
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Figure 7.
Topographic section of late Pleistocene fault scarps offset along the western side of the Qungdo'gyang graben
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Figure 8.
Distribution of late Quaternary throw rates of the main boundary fault in the Qungdo'gyang-Oiga basin