BIOSEDIMENTOLOGY OF QUATERNARY STROMATOLITES IN INTERTROPICAL AFRICA

被引：10

作者：

CASANOVA, J

机构：

[1] Centre de Recherche en Géochimie et en Géochronologie, UQAM, Montreal, Que. H3C 3P8

来源：

JOURNAL OF AFRICAN EARTH SCIENCES | 1991年 / 12卷 / 1-2期

关键词：

D O I：

10.1016/0899-5362(91)90090-L

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Mineralizations of microbial origin constitute a non-negligeable part of Quaternary limestones in intertropical Africa. Stromatolites have colonized a wide range of environments corresponding to different hydroclimatic situations: travertines in fluviatile environments, oncolites in flood plains, encrustations in sebkha areas and shorelines of deep, fresh water lakes. The developed morphologies represent a complete catalogue of the microbial carbonated mineralizations: oncolites, chemneys, pool-rim dams, bioherms, planar or cylindrical encrustations. The building organisms may be either pure bacterial colonies (hydrothermal and lacustrine environments), cyanophyte associations (fluviatile and lacustrine environments) or complex microbial biocoenoses. Stromatolites have recorded the hydrologic, climatic and sedimentologic evolution of the continental environment in intertropical Africa for the past 240 000 years.

引用

页码：409 / 415

页数：7

共 29 条

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[2]

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[3]

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