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Growth line analysis of diagenetically altered scleractinians is only possible if carbonate diagenesis has followed the pathway of aragonite leaching and coeval formation of low magnesium calcite. All other possibilities of aragonite transformation into calcite exclude the preservation of this growth line banding. Examples of these diagenetic patterns are found in the Pleistocene of Barbados. 相似文献
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Prof. Dr. Wolf-Christian Dullo Dr. Marcos Gektidis Prof. Dr. Stjepko Golubic Dr. Georg A. Heiss Dipl. Biol. Heike Kampmann Dr. William Kiene Dipl. Ökol. Dieter K. Kroll Dipl. Biol. Martin L. Kuhrau Dr. Gudrun Radtke Dr. John G. Reijmer Dr. Götz B. Reinicke Prof. Dr. Dietrich Schlichter Prof. Dr. Helmut Schuhmacher Klaus Vogel 《Facies》1995,32(1):145-188
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Jens Zinke John J. G. Reijmer Marco Taviani Wolf-Christian Dullo Bernard Thomassin 《Facies》2005,50(3-4):391-408
This paper documents the facies change in response to the Holocene transgression within five sediment cores taken in the lagoon of Mayotte, which contain a Type-1 depositional sequence (lowstand, transgressive and highstand deposits underlain by an erosive sequence boundary). Quantitative compositional analysis and visual examination of the bioclasts were used to document the facies changes. The distribution of the skeletal and non-skeletal grains in the lagoon of Mayotte is clearly controlled by (1) the rate and amplitude of the Holocene sea-level rise, (2) the pre-Holocene basement topography and (3) the growth-potential of the barrier reef during sea-level rise, and the changes in bathymetry and continuity during this period. The sequence boundary consists of the glacial karst surface. The change-over from the glacial lowstand is marked by the occurrence of mangrove deposits. Terrigenous and/or mixed terrigenous-carbonate muds to sandy muds with a mollusc or mollusc-ostracod assemblage dominate the transgressive deposits. Mixed carbonate-siliciclastic or carbonate sand to gravel with a mollusc-foraminifer or mollusc-coral-foraminifer assemblage characterize the early highstand deposits on the inner lagoonal plains. The early highstand deposits in the outer lagoonal plains consist of carbonate muds with a mollusc-foraminifer assemblage. Late highstand deposits consist of terrigenous muds in the nearshore bays, mixed terrigenous-carbonate sandy muds to sands with a mollusc-foraminifer assemblage on the inner lagoonal plains and mixed muds with a mollusc-foraminifer assemblage on the outer deep lagoonal plains. The present development stage of the individual lagoons comprises semi-enclosed to open lagoons with fair or good water exchange with the open ocean. 相似文献
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Facies and environment of the Leckkogel beds (Carnian;Alps) 总被引:1,自引:1,他引:0
The Carnian Leckkogel beds represent a carbonate sequence, which was deposited in front of an actively spreading carbonate platform. The typical Leckkogel beds are characterized by highly diverse sponge buildups. Sphinctozoan sponges predominate together with rare bryozoans and hydrozoans as well as red algae and thin crusts of cyanophyceans. Foraminifera are very rare and dasycladaceans are missing altogether. Oncoidal limestones containing predominantly inozoans are coeval with the Leckkogel beds. They represent a short-lived colonization of the sea-floor within a basinal environment. In addition to this autochthonous development, allochthonous intercalations of debris-flow sediments occur. The basinal facies consists of shales and argillaceous schists. Towards the edge of the platform the Leckkogel beds interfinger laterally with the Tisovec limestone, which exhibits two main facies types, a reef facies and a lagoonal facies. 相似文献
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Shahrudin Rohani Bikila Dullo Wilmer Woudwijk Pieter de Hoop Annemieke Kooijman Albert Pieter Grootjans 《Plant and Soil》2014,380(1-2):181-191