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Sedimentary evidence of Early–Late Permian mid-latitude continental climate variability, southern Bogda Mountains, NW China
- Source :
-
Palaeogeography, Palaeoclimatology, Palaeoecology . Aug2007, Vol. 252 Issue 1/2, p239-258. 20p. - Publication Year :
- 2007
-
Abstract
- 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. [Copyright &y& Elsevier]
- Subjects :
- *SEDIMENTS
*SURFACE chemistry
*EVAPORATION (Meteorology)
Subjects
Details
- Language :
- English
- ISSN :
- 00310182
- Volume :
- 252
- Issue :
- 1/2
- Database :
- Academic Search Index
- Journal :
- Palaeogeography, Palaeoclimatology, Palaeoecology
- Publication Type :
- Academic Journal
- Accession number :
- 26039492
- Full Text :
- https://doi.org/10.1016/j.palaeo.2006.11.045