滇西昌宁—孟连带内石炭纪—二叠纪鲕粒灰岩的古地理意义

doi:10.7605/gdlxb.1999.03.003

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Abstract

Although the radiolarian cherts of Devonian to Middle Triassic of deep water origin have been reported from the Changning Menglian belt (CMB) in west Yunnan Province, the tectono palaeogeographic nature of the CMB is still in controversy. The confirmation of the oolitic limestones of the Late Carboniferous to the Early Permian Age in the CMB of west Yunnan Province implied the carbonate succession was accumulated in a shallow and agitating environment, possibly as the carbonate caps of oceanic islands. The formation of the carbonate ooids also indicated the ambient water of warm nature under the semi arid palaeoclimatic background. The analysis of geological context showed that the carbonate succession was formed in the southern subtropical semi arid paleo climate zone, in contrast to the time equivalents to the both sides of the CMB. The Changning Menglian ocean thus was the main branch of the Palaeo Tethyan ocean separated the blocks of Gondwana affinities from those of Cathaysian affinities, and situated in the southern subtropical semi arid palaeoclimatic zone and spanned about 10° in palaeolatitude in the Late Carboniferous to the Early Permian Age.

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Published: 01 June 1999

About author: Yan Jiaxin was born in 1962, and graduated from the Department of Geology of Wuhan Geological College in 1983. Now he is an associate professor and engaged in sedimentology and palaeoclimatology at the Department of Earth Sciences in China University of Geosciences (Wuhan).

Cite this article:

. PALAEOGEOGRAPHIC IMPLICATIONS OF CARBONIFEROUS TO PERMIAN OOLITIC LIMESTONES IN THE
CHANGNING MENGLIAN BELT OF WEST YUNNAN[J]. JOURNAL OF PALAEOGEOGRAPHY, 1999, 1(3): 13-18.

. PALAEOGEOGRAPHIC IMPLICATIONS OF CARBONIFEROUS TO PERMIAN OOLITIC LIMESTONES IN THE
CHANGNING MENGLIAN BELT OF WEST YUNNAN[J]. JOPC, 1999, 1(3): 13-18.

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http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.1999.03.003 OR http://journal09.magtechjournal.com/gdlxb/EN/Y1999/V1/I3/13

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