秦岭造山带泥盆纪的沉积体系与古地理格局演化

doi:10.7605/gdlxb.1999.01.003

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Abstract

During the Early Palaeozoic, the South Qinling belonged to the passive continental margin of the Yangtze Plate.It changed to ancient land due to vertical movement in the end of the Silurian. Because its southern margin located in the structure weak zone caused by mantle bugle for a long time , during the Devonian extension first began to form here and a restricted oceanic basin was formed gradually while South Qinling separated from the Yangtze Plate and changed into an independent plate.The environmental framework that faultsubsided basins alternated with blockfaulted uplifts was formed by extension. They are Ankang Uplift→XunyangZhenan Basin→Xiaomoling Uplift→Liuling Basin from south to north, respectively. These basins were generally filled with upward fining and deepening sedimentary sequence that comprises nonmarine to marine,shallow marine to deep marine depositional systems. At the same time,this plate still subducted beneath the North China Plate. The forearc deposition system at the southern margin of North Qinling indirectly recorded this evolution of subduction. The much different palaeogeographic framework from the Early Palaeozoic indicates that Qinling orogenic belt has entered a new evolutionary stage.

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Published: 01 February 1999

About author: Mei Zhichao,male, born in 1937, graduated from Northwest University in 1960. Now he is a professor of Northwest University, and engages in sedimentary geology.

Cite this article:

. DEVONIAN DEPOSITIONAL SYSTEM AND PALAEOGEOGRAPHIC EVOLUTION OF QINLING OROGENIC BELMei ZhichaoMeng QingrenCui ZhilinQu Hongjun[J]. JOURNAL OF PALAEOGEOGRAPHY, 1999, 1(1): 32-40.

. DEVONIAN DEPOSITIONAL SYSTEM AND PALAEOGEOGRAPHIC EVOLUTION OF QINLING OROGENIC BELMei ZhichaoMeng QingrenCui ZhilinQu Hongjun[J]. JOPC, 1999, 1(1): 32-40.

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http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.1999.01.003 OR http://journal09.magtechjournal.com/gdlxb/EN/Y1999/V1/I1/32

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