Diagenesis of carbonate cements in Permo-Triassic sandstones from the Iberian Range, Spain: evidence from chemical composition and stable isotopes

S. Morad; I. S. Al-Aasm; K. Ramseyer; R. Marfil; A. A. Aldahan

doi:10.1016/0037-0738(90)90039-V

Diagenesis of carbonate cements in Permo-Triassic sandstones from the Iberian Range, Spain: evidence from chemical composition and stable isotopes

S. Morad, I. S. Al-Aasm, K. Ramseyer, R. Marfil, A. A. Aldahan

Earth Science

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Abstract

Petrographic, chemical and stable isotope investigations have been made on calcite, dolomite, and Fe-dolomite/ankerite from Permian-Triassic clastic sequences from the Iberian Range (Spain). Calcite and dolomite cements have precipitated before the Fe-dolomite/ankerite. Calcite, however, has also formed by calcitization of dolomite due to uplift. The negative δ¹³C_PDB values (-9.51 to -2.13%) in these carbonates suggest derivation of carbon from oxidation of organic matter in the early carbonates and from decarboxylation of organic matter in the late Fe-dolomite/ankerite. Early diagenetic dolomitic cements have heavier δ¹³C(> -3.54%), higher Mn/(Mn + Fe) and Mn/(Mn + Mg) and lower Fe/(Fe + Mg) ratios than later diagenetic dolomitic cements. The latters are also characterized by lighter δ¹⁸O_PDB (> -10.64%) than the early cements due to increase in temperature and to pore water-mineral reactions.

Original language	British English
Pages (from-to)	281-295
Number of pages	15
Journal	Sedimentary Geology
Volume	67
Issue number	3-4
DOIs	https://doi.org/10.1016/0037-0738(90)90039-V
State	Published - May 1990

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@article{5993f20a861b4ed1aa9411980b08cf03,

title = "Diagenesis of carbonate cements in Permo-Triassic sandstones from the Iberian Range, Spain: evidence from chemical composition and stable isotopes",

abstract = "Petrographic, chemical and stable isotope investigations have been made on calcite, dolomite, and Fe-dolomite/ankerite from Permian-Triassic clastic sequences from the Iberian Range (Spain). Calcite and dolomite cements have precipitated before the Fe-dolomite/ankerite. Calcite, however, has also formed by calcitization of dolomite due to uplift. The negative δ13CPDB values (-9.51 to -2.13%) in these carbonates suggest derivation of carbon from oxidation of organic matter in the early carbonates and from decarboxylation of organic matter in the late Fe-dolomite/ankerite. Early diagenetic dolomitic cements have heavier δ13C(> -3.54%), higher Mn/(Mn + Fe) and Mn/(Mn + Mg) and lower Fe/(Fe + Mg) ratios than later diagenetic dolomitic cements. The latters are also characterized by lighter δ18OPDB (> -10.64%) than the early cements due to increase in temperature and to pore water-mineral reactions.",

author = "S. Morad and Al-Aasm, {I. S.} and K. Ramseyer and R. Marfil and Aldahan, {A. A.}",

note = "Funding Information: This researcwh asf undedb y the SwedishN atural Science Researchc ouncil, NFR (to S.M.), NSERC (to I.S.A), and Spanish{"} Ayudaale In-vestigacion{"}o f Univercidad Complutensed e Madrid (to R.M.). The manuscripht as benefited greatlyf rom the commentosf F. Longstaffea, nd thej ournal'sr efereeCs .D. Curtis, B.W. Sellwood, and E. Usdowski.",

year = "1990",

month = may,

doi = "10.1016/0037-0738(90)90039-V",

language = "British English",

volume = "67",

pages = "281--295",

journal = "Sedimentary Geology",

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TY - JOUR

T1 - Diagenesis of carbonate cements in Permo-Triassic sandstones from the Iberian Range, Spain

T2 - evidence from chemical composition and stable isotopes

AU - Morad, S.

AU - Al-Aasm, I. S.

AU - Ramseyer, K.

AU - Marfil, R.

AU - Aldahan, A. A.

N1 - Funding Information: This researcwh asf undedb y the SwedishN atural Science Researchc ouncil, NFR (to S.M.), NSERC (to I.S.A), and Spanish" Ayudaale In-vestigacion"o f Univercidad Complutensed e Madrid (to R.M.). The manuscripht as benefited greatlyf rom the commentosf F. Longstaffea, nd thej ournal'sr efereeCs .D. Curtis, B.W. Sellwood, and E. Usdowski.

PY - 1990/5

Y1 - 1990/5

N2 - Petrographic, chemical and stable isotope investigations have been made on calcite, dolomite, and Fe-dolomite/ankerite from Permian-Triassic clastic sequences from the Iberian Range (Spain). Calcite and dolomite cements have precipitated before the Fe-dolomite/ankerite. Calcite, however, has also formed by calcitization of dolomite due to uplift. The negative δ13CPDB values (-9.51 to -2.13%) in these carbonates suggest derivation of carbon from oxidation of organic matter in the early carbonates and from decarboxylation of organic matter in the late Fe-dolomite/ankerite. Early diagenetic dolomitic cements have heavier δ13C(> -3.54%), higher Mn/(Mn + Fe) and Mn/(Mn + Mg) and lower Fe/(Fe + Mg) ratios than later diagenetic dolomitic cements. The latters are also characterized by lighter δ18OPDB (> -10.64%) than the early cements due to increase in temperature and to pore water-mineral reactions.

AB - Petrographic, chemical and stable isotope investigations have been made on calcite, dolomite, and Fe-dolomite/ankerite from Permian-Triassic clastic sequences from the Iberian Range (Spain). Calcite and dolomite cements have precipitated before the Fe-dolomite/ankerite. Calcite, however, has also formed by calcitization of dolomite due to uplift. The negative δ13CPDB values (-9.51 to -2.13%) in these carbonates suggest derivation of carbon from oxidation of organic matter in the early carbonates and from decarboxylation of organic matter in the late Fe-dolomite/ankerite. Early diagenetic dolomitic cements have heavier δ13C(> -3.54%), higher Mn/(Mn + Fe) and Mn/(Mn + Mg) and lower Fe/(Fe + Mg) ratios than later diagenetic dolomitic cements. The latters are also characterized by lighter δ18OPDB (> -10.64%) than the early cements due to increase in temperature and to pore water-mineral reactions.

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ER -

Diagenesis of carbonate cements in Permo-Triassic sandstones from the Iberian Range, Spain: evidence from chemical composition and stable isotopes

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