Journal
SCIENCE CHINA-EARTH SCIENCES
Volume 53, Issue 8, Pages 1126-1133Publisher
SCIENCE PRESS
DOI: 10.1007/s11430-010-4006-z
Keywords
Qaidam Basin; Altyn Tagh Fault; Miocene; angular unconformity; strike slip movement
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Funding
- National Tenth Five Science and Technology Foundation [2004BA616A-04-01]
- Qinghai Oilfield Company, China National Petroleum Corporation Foundation [02-107401-7]
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An angular unconformity has been identified between the upper and the lower Youshashan Formation based on the study of the regional geology, drillhole, and geophysical data of the Altyn Tagh Mountain foreland, western Qaidam Basin. The distribution of the unconformity, the contacts between the upper and the lower Youshashan Formation, and its relation to the characteristics of the paleo-structure belts suggest a close relationship between the unconformities in the southern flank of the Altyn Tagh Mountain in the west of the Qaidam Basin and the activity of the Altyn Tagh Fault. It was the same time when the Atlyn Tagh Fault Zone was transformed from regional uplifting to rapid-strike-slipping movement during the Miocene, resulting in the cessation of the regional uplift and subsequent massive regional transgression during the deposition of the upper Youshashan Formation, which unconformably overlies (onlaps) the underlying strata of different ages.
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