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Turbidite Deposits of the Songpan-Ganzi Complex, china

By
Amy L. Weislogel
Amy L. Weislogel
Department of Geological and Environmental Sciences, Stanford University, Stanford, California, USA
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Stephan A. Graham
Stephan A. Graham
Department of Geological and Environmental Sciences, Stanford University, Stanford, California, USA
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Published:
January 01, 2008

Abstract

The Triassic Songpan-Ganzi Complex (SGC) of central china is one of the world’s largest ancient turbidite systems, containing a thick succession of Anisian through Norian (∼240-210 Ma) turbidites. Geotectonically, the Songpan-Ganzi complex is situated at the juncture of several tectonic blocks: North china, Qiadam, South china, and North Tibet (i.e., Qiangtang; Figure 1). Songpan-Ganzi basin closure and inversion occurred during early Jurassic time and was later intruded and locally metamorphosed by Jurassic to Cretaceous plutons. Few studies document the nature of these turbidites due to the limited nature of outcrop exposures, steep topography, steep dip angles (70-90°) associated with isoclinal folds, and thick vegetation. A stratigraphic framework has recently been established for the Songpan-Ganzi terrane based on field mapping, lithology, and fossils. The fossils are sufficiently abundant to permit stage-level age assignments and correlation throughout much of the SGC basin (Figure 2). The succession of Middle to Upper Triassic turbidites within the Songpan-Ganzi complex is an estimated >10 km (>6 mi) thick, locally reaching a thickness of 15 km (9 mi), and cover a triangular area >200,000 km2 (77,000 mi2), an area about the size of the U.S. state of Colorado.

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Contents

AAPG Studies in Geology

Atlas of Deep-Water Outcrops

Tor H. Nilsen
Tor H. Nilsen
Desceased
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Roger D. Shew
Roger D. Shew
University of North Carolina
Wilmington, North Carolina
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Gary S. Steffens
Gary S. Steffens
Shell International E&P
Houston, Texas
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Joseph R. J. Studlick
Joseph R. J. Studlick
Maersk Oil America Inc.
Houston, Texas
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American Association of Petroleum Geologists
Volume
56
ISBN electronic:
9781629810331
Publication date:
January 01, 2008

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