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Microbial communities and their primary to early diagenetic mineral phases; the record from Neoproterozoic microbialites of Qarn Alam, Oman

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M. Mettraux
M. Mettraux
GEOSOLUTIONS TRD c/o Petrobras E&P-EXP/GEO, Av. Republica do Chile 330, Centro, RJ 20031-170, Brazil
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P. Homewood
P. Homewood
GEOSOLUTIONS TRD c/o Petrobras E&P-EXP/GEO, Av. Republica do Chile 330, Centro, RJ 20031-170, Brazil
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C. Dos Anjos
C. Dos Anjos
CENPES/PDGEO/IRPS, Petrobras, Av Horàcio de Macedo Cidade Universitaria, 950, Ilha do Fundão, RJ 21941-915, Brazil
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M. Erthal
M. Erthal
CENPES/PDGEO/IRPS, Petrobras, Av Horàcio de Macedo Cidade Universitaria, 950, Ilha do Fundão, RJ 21941-915, Brazil
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R. Lima
R. Lima
CENPES/PDGEO/IRPS, Petrobras, Av Horàcio de Macedo Cidade Universitaria, 950, Ilha do Fundão, RJ 21941-915, Brazil
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N. Matsuda
N. Matsuda
Petrobras E&P-EXP/GEO/ES, Av. Republica do Chile 330, Centro, RJ 20031-170, Brazil
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A. Souza
A. Souza
CENPES/PDGEO/IRPS, Petrobras, Av Horàcio de Macedo Cidade Universitaria, 950, Ilha do Fundão, RJ 21941-915, Brazil
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S. Al Balushi
S. Al Balushi
PDO, Mina Al Fahal, POBox 100, Muscat, Sultanate of Oman
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Published:
January 01, 2015

Abstract

The 10 m-scale shallowing-up Neoproterozoic carbonate cycles at Qarn Alam (Oman) provide a record of microbial textures and the communities responsible for them. This is documented for four major microbialite facies. Despite their age, these microbialites show extremely fine preservation of microbial fossils and mineral associations (primary calcite and dolomite with minor phosphate, glauconite, palygorskite, hematite and goethite) and they are the record of a suite of microbial communities, from pellicular biofilms (planar laminites) to mats and gels (crinkly laminites, and stromatolitic layered and massive thrombolites) and a more complex microbial community in bushy thrombolites possibly involving a sponge-like form. Mineralized extra-cellular polymeric substances (EPS) resembles that of modern microbial mats. The mineral associations, as well as cathodoluminescence attributes, indicate oxic to suboxic conditions during deposition and early diagenesis for planar laminites and crinkly laminites, but more evaporitic to saline conditions during development of thrombolites of the upper part of a cycle. Early cementation under variable redox conditions sealed the organomineralized phases.

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Geological Society, London, Special Publications

Microbial Carbonates in Space and Time: Implications for Global Exploration and Production

D. W. J. Bosence
D. W. J. Bosence
Royal Holloway, University of London, UK
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K. A. Gibbons
K. A. Gibbons
Nexen Petroleum UK Ltd, UK
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D. P. Le Heron
D. P. Le Heron
Royal Holloway, University of London, UK
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W. A. Morgan
W. A. Morgan
Morgan Geoscience Consulting, LLC, USA
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T. Pritchard
T. Pritchard
BG Group, UK
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B. A. Vining
B. A. Vining
Royal Holloway, University of London, UK
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Geological Society of London
Volume
418
ISBN electronic:
9781862397163
Publication date:
January 01, 2015

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