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Section at Daping reveals Sino-Baltoscandian parallelism of facies in the Ordovician

1991; Taylor & Francis; Volume: 113; Issue: 2-3 Linguagem: Inglês

10.1080/11035899109453855

0016-786X

Maurits Lindström, Junyuan Chen, Junming Zhang,

Geological and Geophysical Studies

Abstract Abstract A bed-by-bed record of a 92m thick section through the Arenig to lower Ashgill at Daping near Yichang, Yangtze Platform, is the first Ordovician section from China to be presented internationally in this detail. The predominant facies is identical to what is known in northern Europe as Orthoceratite limestone. Among features shared between the Chinese and Baltoscandian carbonate facies are frequently occurring, bored and/or burrowed, mineralized discontinuity surfaces, buckled beds, perched cephalopod conchs, thin seams of small ferrugineous stromatoids, and biocalcarenitic components dominated by arthropods and echinoderms. The Chinese as well as the Baltoscandian sections show evidence of a major regression about the transition from the Arenigian to the Llanvirnian. Contrasting with Baltoscandian sections, the Daping section begins with tropical to subtropical carbonate platform facies. Key Words: OrdovicianChinaBaltoscandiaOrthoceratite limestonecarbonatestratigraphybiofacies