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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
AAPG Bulletin, V.
1Manuscript received September 29, 1995; revised manuscript
received December 16, 1996; final acceptance July 23, 1997.
2Department of Earth Sciences, The Oil-Gas Research Centre,
Nanjing University, Nanjing, 210093, Peoples Republic of China.
This study is a part of a research project on the Tarim basin supported
by the State Scientific Committee of China. We especially thank the Tarim
Petroleum Exploration & Development Bureau of the CNPC for generously
providing some of the background information, and Chengzao Jia for his
valuable suggestions. We also thank Edmund Z. Chang and Mian Liu for critically
reviewing the manuscript.
ABSTRACT
The rhombus-shaped Tarim basin in northwestern China is controlled
mainly by two left-lateral strike-slip systems: the northeast-trending
Altun fault
zone along its southeastern side and the northeast- trending
Aheqi
fault
zone along its northwestern side. In this paper, we discuss
the northern Tarim basins structural features, which include three main
tectonic units: the Kalpin uplift, the Kuqa depression, and the North Tarim
uplift along the northern margin of the Tarim basin. Structural mapping
in the Kalpin uplift shows that a series of imbricated thrust sheets have
been overprinted by strike-slip faulting. The amount of strike-slip displacement
is estimated to be 148 km by restoration of strike-slip structures in the
uplift. The Kuqa depression is a Mesozoic- Cenozoic foredeep depression
with well-developed flat-ramp structures and
fault
-related folds. The Baicheng
basin, a Quaternary pull-apart basin, developed at the center of the Kuqa
depression. Subsurface structures in the North Tarim uplift can be divided
into the Mesozoic-Cenozoic and the Paleozoic lithotectonic sequences in
seismic profiles. The Paleozoic litho-tectonic sequence exhibits the interference
of earlier left-lateral and later right-lateral strike-slip structures.
Many normal faults in the Mesozoic-Cenozoic litho-tectonic sequence form
the negative flower structures in the North Tarim uplift; these structures
commonly directly overlie the positive flower structures in the Paleozoic
litho-tectonic sequence. The interference regions of the northwest-trending
and northeast-trending folds in the Paleozoic tectonic sequence have been
identified to have the best
trap
structures. Our structural analysis indicates
that the Tarim basin is a transpressional foreland basin rejuvenated during
the Cenozoic.
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