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Cordilleran Section - 97th Annual Meeting, and Pacific Section, American Association of Petroleum Geologists (April 9-11, 2001)

Paper No. 0
Presentation Time: 10:50 AM

BASIN ANALYSIS OF LUANPING BASIN, HEBEI PROVINCE, NORTHEAST CHINA: EARLY CRETACEOUS TRANSTENSION IN THE YANSHAN AREA


COPE, Tim D.1, SHULTZ, Michael1, WEIHUA, Sun2, CHANGHOU, Zhang2 and GRAHAM, S. A.3, (1)Geological and Environmental Sciences, Stanford Univ, Stanford, CA 94305, (2)China Univ of Geosciences, Beijing 100083, China, (3)Department of Geological and Environmental Sciences, Stanford Univ, Stanford, CA 94305, tcope@pangea.stanford.edu

In order to document the existence of a family of Cretaceous extensional basins in northeast China, a study was conducted on one such basin using standard basin analysis field techniques. This basin, herein termed Luanping basin, is a NE-trending, elongate exposure of Lower Cretaceous strata located 130 km NE of Beijing which comprises up to 3 km of post-127 Ma lacustrine, fan delta, fluvial and volcanic strata.

Sediment dispersal patterns, facies trends, and the presence of basin bounding normal faults associated with thick, coarse grained alluvial fan and fan delta deposits favor a modified half graben model for Luanping basin. In this model, the northern and western margins of the basin are bounded by normal faults which were active during deposition and controlled sedimentation into the basin. The southeastern margin of the basin is a gently dipping ramp. Interfingering fan delta and profundal lacustrine deposits occupy the region nearest the juncture of these two faults, while predominantly fine grained shallow lacustrine, perilacustrine, and fluvial deposits dominate the ramp.

This structural configuration, odd for a simple rift basin, coupled with the presence of a number of NE-trending sinistral strike-slip faults in the area, may indicate a transtensional mode of origin for Luanping basin. Provenance of conglomerates adjacent to the northern basin-bounding fault support the existence of at least 10 km of left slip on this fault.

Session No. 2

T5. Tectonics of Eastern Asia with Emphasis on Northern China and Mongolia
Monday, 9 April 2001: 8:00 AM-11:30 AM
Geological Society of America Abstracts with Programs. Vol. 33, No. 3, March 2001, p.32
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