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

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)281-295
Number of pages15
JournalSedimentary Geology
Volume67
Issue number3-4
DOIs
Publication statusPublished - May 1990
Externally publishedYes

ASJC Scopus subject areas

  • Geology
  • Stratigraphy

Fingerprint

Dive into the research topics of 'Diagenesis of carbonate cements in Permo-Triassic sandstones from the Iberian Range, Spain: evidence from chemical composition and stable isotopes'. Together they form a unique fingerprint.

Cite this