Origin of low δ18O, pre-compactional ferroan carbonates in the marine Stø Formation (Middle Jurassic), offshore NW Norway

S. Morad; Luiz F. De Ros; I. S. Al-Aasm

doi:10.1016/0264-8172(95)00059-3

Origin of low δ¹⁸O, pre-compactional ferroan carbonates in the marine Stø Formation (Middle Jurassic), offshore NW Norway

S. Morad
, Luiz F. De Ros
, I. S. Al-Aasm

Earth Science

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

30 Scopus citations

Abstract

Siderite (δ¹⁸O_PDB = -9.3 to -5.7‰) and Fe-dolomite/ankerite (δ¹⁸O_PDB = -13.7 to -7.7‰) occur as texturally early diagenetic, pre-compactional cements in sandstones and mudstones of the nearshore to inner shelf Stø Formation (Middle Jurassic), Troms I area, Barents Sea. However, these carbonates have anomalously low δ¹⁸O, probably due to alteration of volcaniclastic materials to clay matrix, as well as to clay ooids and peloids through the interaction with marine porewaters. The lowermost δ¹⁸O values could, however, be related to replacement during deep burial and/or to upwelling of hot fluids related to the Jurassic rifting in the Hammerfest Basin. The alteration of volcaniclastic materials also has most likely been an important source of Fe and Mg for the formation of the carbonates.

Original language	British English
Pages (from-to)	263-276
Number of pages	14
Journal	Marine and Petroleum Geology
Volume	13
Issue number	2
DOIs	https://doi.org/10.1016/0264-8172(95)00059-3
State	Published - Mar 1996

Keywords

Ankerite
Sandstone diagenesis
Siderite

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@article{8258d1887d594c4ca216692578bae190,

title = "Origin of low δ18O, pre-compactional ferroan carbonates in the marine St{\o} Formation (Middle Jurassic), offshore NW Norway",

abstract = "Siderite (δ18OPDB = -9.3 to -5.7‰) and Fe-dolomite/ankerite (δ18OPDB = -13.7 to -7.7‰) occur as texturally early diagenetic, pre-compactional cements in sandstones and mudstones of the nearshore to inner shelf St{\o} Formation (Middle Jurassic), Troms I area, Barents Sea. However, these carbonates have anomalously low δ18O, probably due to alteration of volcaniclastic materials to clay matrix, as well as to clay ooids and peloids through the interaction with marine porewaters. The lowermost δ18O values could, however, be related to replacement during deep burial and/or to upwelling of hot fluids related to the Jurassic rifting in the Hammerfest Basin. The alteration of volcaniclastic materials also has most likely been an important source of Fe and Mg for the formation of the carbonates.",

keywords = "Ankerite, Sandstone diagenesis, Siderite",

author = "S. Morad and \{De Ros\}, \{Luiz F.\} and Al-Aasm, \{I. S.\}",

note = "Funding Information: Financial support for this study was provided by the Swedish Natural Science Research Council (NFGR, to SM) and the National Science and Engineering Research Council of Canada (to ISA). L. F. De Ros acknowledges financial support from the National Council of Research of Brazil (CNPq; Grant 200465/ 92.2-GL). We thank P. K. Egeberg (Agder College, Norway) for access to unpublished equations and calculations of the influence of alteration of volcanic sediments on shifts of pore-water 5180. Thanks are also due to Statoil for providing samples and thin sections, and for the licence to publish this work. We thank H. Harryson for help with EMP analyses, C. B\textasciitilde{}ick and B. Gi6s for photographic work, and C. Wernstr6m for drafting the figures.",

year = "1996",

month = mar,

doi = "10.1016/0264-8172(95)00059-3",

language = "British English",

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journal = "Marine and Petroleum Geology",

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T1 - Origin of low δ18O, pre-compactional ferroan carbonates in the marine Stø Formation (Middle Jurassic), offshore NW Norway

AU - Morad, S.

AU - De Ros, Luiz F.

AU - Al-Aasm, I. S.

N1 - Funding Information: Financial support for this study was provided by the Swedish Natural Science Research Council (NFGR, to SM) and the National Science and Engineering Research Council of Canada (to ISA). L. F. De Ros acknowledges financial support from the National Council of Research of Brazil (CNPq; Grant 200465/ 92.2-GL). We thank P. K. Egeberg (Agder College, Norway) for access to unpublished equations and calculations of the influence of alteration of volcanic sediments on shifts of pore-water 5180. Thanks are also due to Statoil for providing samples and thin sections, and for the licence to publish this work. We thank H. Harryson for help with EMP analyses, C. B~ick and B. Gi6s for photographic work, and C. Wernstr6m for drafting the figures.

PY - 1996/3

Y1 - 1996/3

N2 - Siderite (δ18OPDB = -9.3 to -5.7‰) and Fe-dolomite/ankerite (δ18OPDB = -13.7 to -7.7‰) occur as texturally early diagenetic, pre-compactional cements in sandstones and mudstones of the nearshore to inner shelf Stø Formation (Middle Jurassic), Troms I area, Barents Sea. However, these carbonates have anomalously low δ18O, probably due to alteration of volcaniclastic materials to clay matrix, as well as to clay ooids and peloids through the interaction with marine porewaters. The lowermost δ18O values could, however, be related to replacement during deep burial and/or to upwelling of hot fluids related to the Jurassic rifting in the Hammerfest Basin. The alteration of volcaniclastic materials also has most likely been an important source of Fe and Mg for the formation of the carbonates.

AB - Siderite (δ18OPDB = -9.3 to -5.7‰) and Fe-dolomite/ankerite (δ18OPDB = -13.7 to -7.7‰) occur as texturally early diagenetic, pre-compactional cements in sandstones and mudstones of the nearshore to inner shelf Stø Formation (Middle Jurassic), Troms I area, Barents Sea. However, these carbonates have anomalously low δ18O, probably due to alteration of volcaniclastic materials to clay matrix, as well as to clay ooids and peloids through the interaction with marine porewaters. The lowermost δ18O values could, however, be related to replacement during deep burial and/or to upwelling of hot fluids related to the Jurassic rifting in the Hammerfest Basin. The alteration of volcaniclastic materials also has most likely been an important source of Fe and Mg for the formation of the carbonates.

KW - Ankerite

KW - Sandstone diagenesis

KW - Siderite

UR - https://www.scopus.com/pages/publications/0029750386

U2 - 10.1016/0264-8172(95)00059-3

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M3 - Article

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