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The AAPG/Datapages Combined Publications Database

Dallas Geological Society

Abstract


Devonian of the World: Proceedings of the 2nd International Symposium on the Devonian System — Memoir 14, Volume II: Sedimentation, 1988
Pages 667-671
Carbonates, Reefs and Evaporites

Discussion on the Genesis and Sedimentary Environment of the Late Devonian “Lenticular Limestone” in Guangxi, China

Daonian Fang

Abstract

A variety of carbonate and mixed carbonate-shale facies have been recognized in the Wuzhishan Formation (Famennian) of Guangxi, China. These facies include: (1) massive micritic limestone, (2) interbedded micritic limestone (1-15 cm beds) and shale (0.2-1.5 cm beds), (3) lenticular micritic limestone in a shale matrix, (4) nodular micritic limestone in a shale matrix, (5) limestone breccia with an argillaceous matrix, (6) styolitic micritic limestone. The massive micritic limestone facies represents a marine platform deposit with the three micritic limestone-shale facies representing deeper water deposits of outer platform origin. The lenticular and nodular fabrics are likely the products of compaction effects on interbedded limestone and shale. The limestone breccias were formed by dissolution collapse and by slope failure in outer platform and marine slope environments.

The lithologies are often arranged in shallowing upward cycles a few metres thick. In the north, where water depths were shallowest, massive micritic limestones dominate the cycles with lenticular limestones occurring in the basal portion of the cycles. Southward a variety of limestone shale facies occur in the lower portions of the cycles. In the most southerly localities limestone breccias are also present within the cycles.


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