Sandstone pseudomorphs of aragonite fossils in an Ordovician vadose zone
作者:
NILS‐MARTIN HANKEN,
期刊:
Sedimentology
(WILEY Available online 1979)
卷期:
Volume 26,
issue 1
页码: 135-142
ISSN:0037-0746
年代: 1979
DOI:10.1111/j.1365-3091.1979.tb00343.x
出版商: Blackwell Publishing Ltd
数据来源: WILEY
摘要:
ABSTRACTMoulds after aragonite fossils from two Upper Ordovician limestones in the Oslo Region are filled with well sorted clastic fine sand. The fossil moulds are thought to have been formed by selective dissolution of aragonite shell material by fresh water in the vadose zone. Internal sedimentation post‐dates precipitation of a thin veneer of iron poor drusy calcite cement, but predates precipitation of ferroan blocky calcite cement. These age relationships and the texture of the fine sand suggests sedimentation in semiconsolidated sediment in the vadose zone of an island during early emergenc
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