--> ABSTRACT: Structural and Paleogeographic Elements of the Nanpanjiang Basin, Guizhou, Guangxi, and Yunnan Provinces, South China. A Compilation from Satellite Images, Regional Geologic Maps and Ground Observations, by Jon Koenig, Pete Dillett, Daniel Lehrmann, and Paul Enos; #90906(2001)
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Previous HitJonTop Koenig1, Pete Dillett2, Daniel Lehrmann1, Paul Enos3

(1) University of Wisconsin Oshkosh, Oshkosh, WI
(2) University of Wisconsin Oshkosh, Oshkosh
(3) University of Kansas, Lawrence, KS

ABSTRACT: Structural and Paleogeographic Elements of the Nanpanjiang Basin, Guizhou, Guangxi, and Yunnan Provinces, South China. A Compilation from Satellite Images, Regional Geologic Maps and Ground Observations

The Nanpanjiang basin was an embayment in the southern margin of the Yangtze microcontinent. Marine sedimentation continued from the Early Paleozoic to the Late Triassic when synorogenic turbidites filled the basin. Triassic platforms include a great diversity of architectures and evolutionary histories that reflect differences in tectonics, subsidence, carbonate production, and siliciclastic influx. The contrast between the high-relief karst terrain and stream-eroded siliciclastics strikingly delineates platforms in satellite images. The Yangtze platform (YP) margin that rims the basin extends 530 km in a sigmoid from Guizhou to Yunnan. Five isolated platforms (IP), up to 150 km across occur in southern Guizhou and Guangxi. The YP and IP evolved from ramps with oolite margins in the Early Triassic to Tubiphytes reef margins in the Middle Triassic. The western YP and the northernmost IP developed high-relief erosional escarpments following the reefs. The western YP was drowned and buried by turbidites in the Late Triassic whereas shallow-water sedimentation continued until burial by siliciclastics in the north. The IP show a pattern of northward increasing longevity prior to burial by siliciclastics. Narrow faulted N-S and NE-SW trending synclines separated by broad anticlines stretch across the northern YP. The western YP contains a series of N-S, NW-SE and NE-SW trending folds that form complex triangular fold domains. This folding occurred between the Late Jurassic and Late Cretaceous. A spectacular, northward convex, fold and fault belt formed during the Late Tertiary and extends across the southern part of the basin.

AAPG Search and Discovery Article #90906©2001 AAPG Annual Convention, Denver, Colorado