Petrology, chemistry and diagenesis of calcite concretions in Silurian shales from central Sweden

Sadoon Morad; Melesse Eshete

doi:10.1016/0037-0738(90)90010-Q

Petrology, chemistry and diagenesis of calcite concretions in Silurian shales from central Sweden

Sadoon Morad, Melesse Eshete

Earth Science

Uppsala University

Research output: Contribution to journal › Article › peer-review

40 Scopus citations

Abstract

Calcite concretions in the lower Silurian Rastrites Shale from central Sweden were formed within 1 m depth of the seafloor. Micrite (1-4 μm) was formed initially but recrystallized into microspar (> 4-50 μm) and subsequently transformed into pseudospar (> 50-150 μm). Skeletal calcite in the concretions and in the host shale has been replaced by microspar which is chemically similar to that occurring in the concretion body. The δ¹³C_PDB values (mostly between -2‰ and 2‰) suggest that carbonates were mainly derived from seawater. Some of the carbon within calcite was derived from the oxidation of organic matter. Recrystallization has resulted in increasingly negative δ¹⁸ O_PDB values (-7‰ to -4.3‰) whereas the δ¹³C was not changed significantly.

Original language	British English
Pages (from-to)	113-134
Number of pages	22
Journal	Sedimentary Geology
Volume	66
Issue number	1-2
DOIs	https://doi.org/10.1016/0037-0738(90)90010-Q
State	Published - Feb 1990

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@article{3ce2b646ab9349229dcfe96099698646,

title = "Petrology, chemistry and diagenesis of calcite concretions in Silurian shales from central Sweden",

abstract = "Calcite concretions in the lower Silurian Rastrites Shale from central Sweden were formed within 1 m depth of the seafloor. Micrite (1-4 μm) was formed initially but recrystallized into microspar (> 4-50 μm) and subsequently transformed into pseudospar (> 50-150 μm). Skeletal calcite in the concretions and in the host shale has been replaced by microspar which is chemically similar to that occurring in the concretion body. The δ13CPDB values (mostly between -2‰ and 2‰) suggest that carbonates were mainly derived from seawater. Some of the carbon within calcite was derived from the oxidation of organic matter. Recrystallization has resulted in increasingly negative δ18 OPDB values (-7‰ to -4.3‰) whereas the δ13C was not changed significantly.",

author = "Sadoon Morad and Melesse Eshete",

note = "Funding Information: We are grateful to T. Alexandersson, S. Burley, C.D. Curtis, M. Lindstr/Sm, C.J. Talbot, B.W. Sellwood and two reviewers of Sedimentary Geology for the critical reading of the manuscript. K. Ramseyer kindly helped us with the CL work. S. Morad thanks the Swedish Natural Science Research Council (NFR) for financial support.",

year = "1990",

month = feb,

doi = "10.1016/0037-0738(90)90010-Q",

language = "British English",

volume = "66",

pages = "113--134",

journal = "Sedimentary Geology",

issn = "0037-0738",

publisher = "Elsevier B.V.",

number = "1-2",

}

TY - JOUR

T1 - Petrology, chemistry and diagenesis of calcite concretions in Silurian shales from central Sweden

AU - Morad, Sadoon

AU - Eshete, Melesse

N1 - Funding Information: We are grateful to T. Alexandersson, S. Burley, C.D. Curtis, M. Lindstr/Sm, C.J. Talbot, B.W. Sellwood and two reviewers of Sedimentary Geology for the critical reading of the manuscript. K. Ramseyer kindly helped us with the CL work. S. Morad thanks the Swedish Natural Science Research Council (NFR) for financial support.

PY - 1990/2

Y1 - 1990/2

N2 - Calcite concretions in the lower Silurian Rastrites Shale from central Sweden were formed within 1 m depth of the seafloor. Micrite (1-4 μm) was formed initially but recrystallized into microspar (> 4-50 μm) and subsequently transformed into pseudospar (> 50-150 μm). Skeletal calcite in the concretions and in the host shale has been replaced by microspar which is chemically similar to that occurring in the concretion body. The δ13CPDB values (mostly between -2‰ and 2‰) suggest that carbonates were mainly derived from seawater. Some of the carbon within calcite was derived from the oxidation of organic matter. Recrystallization has resulted in increasingly negative δ18 OPDB values (-7‰ to -4.3‰) whereas the δ13C was not changed significantly.

AB - Calcite concretions in the lower Silurian Rastrites Shale from central Sweden were formed within 1 m depth of the seafloor. Micrite (1-4 μm) was formed initially but recrystallized into microspar (> 4-50 μm) and subsequently transformed into pseudospar (> 50-150 μm). Skeletal calcite in the concretions and in the host shale has been replaced by microspar which is chemically similar to that occurring in the concretion body. The δ13CPDB values (mostly between -2‰ and 2‰) suggest that carbonates were mainly derived from seawater. Some of the carbon within calcite was derived from the oxidation of organic matter. Recrystallization has resulted in increasingly negative δ18 OPDB values (-7‰ to -4.3‰) whereas the δ13C was not changed significantly.

UR - http://www.scopus.com/inward/record.url?scp=0025224365&partnerID=8YFLogxK

U2 - 10.1016/0037-0738(90)90010-Q

DO - 10.1016/0037-0738(90)90010-Q

M3 - Article

AN - SCOPUS:0025224365

SN - 0037-0738

VL - 66

SP - 113

EP - 134

JO - Sedimentary Geology

JF - Sedimentary Geology

IS - 1-2

ER -

Petrology, chemistry and diagenesis of calcite concretions in Silurian shales from central Sweden

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