Title

Sedimentary Evidence of Early-Late Permian Mid-Latitude Continental Climate Variability, Southern Bogda Mountains, NW China

Abstract

A preliminary Early-Late Permian mid-latitude continental climatic record in NW China was interpreted mainly from sedimentary climate indicators and type and stacking pattern of depositional systems and cycles in a 1178-m fluvial-lacustrine section. Depositional systems analysis delineated five types of primary fluvial and lacustrine depositional cycles, which were grouped into three (high, intermediate, and low) orders. Semi-arid, subhumid, and humid climate types in terms of relative precipitation/evaporation ratio were interpreted and climate variability was identified at sub-cycle and high, intermediate, and low-order cycle scales. Early Kungurian climate fluctuated between subhumid to humid and middle-late Kungurian climate shifted gradually from subhumid/semi-arid to semi-arid. Roadian climate fluctuated widely from humid to semi-arid with strong precipitation seasonality at sub-cycle and high-order cycle scales. Wordian climate was dominantly humid with short subhumid intervals and ended with a peak semi-arid condition. Capitanian climate was mainly subhumid to humid, as the start of a long interval of dominantly humid, strongly wet-dry conditions into the Wuchiapingian time. The late Kungurian-Wordian semi-arid condition is incompatible with modern mid-latitude east-coast humid climate, suggesting different mechanisms operating in Pangea and Panthalassa. The highly variable Roadian-Wordian climate may have started terrestrial mass extinction that climaxed at the end of Permian.

Department(s)

Geosciences and Geological and Petroleum Engineering

Keywords and Phrases

China; Continental Climate; Early To Late Permian; Lacustrine; Climate Variation; Depositional Sequence; Fluvial Deposit; Lacustrine Environment; Midlatitude Environment; Paleoclimate; Permian; Semiarid Region; Stacking; Asia; Bogda Mountains; Eurasia; Far East; Xinjiang Uygur

Geographic Coverage

NW China

Time Period

Permian

International Standard Serial Number (ISSN)

310182

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2007 Elsevier, All rights reserved.

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