Imperial College London
Alternate

Dr Craig Smalley

Faculty of Engineering, Department of Earth Science & Engineering

Visiting Professor
 
 
 
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Contact

 

c.smalley

 
 
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Location

 

Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Fouke:1996:10.1144/GSL.SP.1996.104.01.17,
author = {Fouke, BW and Everts, AJW and Zwart, EW and Schlager, W and Smalley, PC and Weissert, H},
doi = {10.1144/GSL.SP.1996.104.01.17},
journal = {Geological Society Special Publication},
pages = {295--320},
title = {Subaerial exposure unconformities on the Vercors carbonate platform (SE France) and their sequence stratigraphic significance},
url = {http://dx.doi.org/10.1144/GSL.SP.1996.104.01.17},
volume = {104},
year = {1996}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The integration of data on diagenesis and stratal geometry at the margin of the Vercors carbonate platform (SE France) shows that the most prominent break in depositional style does not coincide with the platform-top horizon exhibiting the most extensive meteoric alteration. This observation again illustrates the ambiguity of geometrical criteria to define sequence boundaries related to subaerial exposure. Outcrops at the margin of the Cretaceous Vercors platform expose prograding to aggrading tongues of platform grainstones. Growth and lateral progradation of these platform tongues was frequently interrupted, as evidenced by the deposition of wedges of fine-gmtaed deeper water sediments that encroached the clinoform slopes. Petrographic and geochemical analyses have been carried out at strategic bedding surfaces in order to evaluate the extent to which these breaks relate to sea-level falls and subaerial exposure. The analyses reveal evidence for minor meteoric alteration at all four of the bedding surfaces on the platform top that were studied. However, the Surface 3 bedding plane is unique in that it shows the overprinting of several events of meteoric diagenesis. Petrographic and geochemical analyses suggest that the rudist floatstones at this particular surface were diagenetically overprinted at least three times by meteoric groundwaters that dissolved skeletal grains and precipitated bladed and blocky calcite cements that exhibit bladed to blocky morphologies, low Mg, Mn and Fe abundances, depleted δ18O and δ13C signatures, and freshwater fluid inclusions. Hardground borings then cross-cut the meteoric calcite cements and biomolds, indicating that the subaerial exposure and meteoric overprinting took place prior to deposition of the overlying marine grainstones. This ensuing period of marine inundation was also accompanied by the deposition of red argillaceous internal sediments and dolomitization. The marine grainstones overlying Surface 3 contain
AU  - Fouke,BW
AU  - Everts,AJW
AU  - Zwart,EW
AU  - Schlager,W
AU  - Smalley,PC
AU  - Weissert,H
DO  - 10.1144/GSL.SP.1996.104.01.17
EP  - 320
PY  - 1996///
SN  - 0305-8719
SP  - 295
TI  - Subaerial exposure unconformities on the Vercors carbonate platform (SE France) and their sequence stratigraphic significance
T2  - Geological Society Special Publication
UR  - http://dx.doi.org/10.1144/GSL.SP.1996.104.01.17
VL  - 104
ER  -
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