Carbon and oxygen stable isotope record of upper Kimmeridgian shallow-marine ramp carbonates (Iberian Basin, NE Spain): the imprint of different burial and tectonic histories
نویسندگان
چکیده
Bulk carbon and oxygen stable isotopes of ancient shallow-marine carbonates can record the effects multiple palaeoenvironmental factors, but also imprint several post-depositional processes, which may alter original marine isotopic composition. In this study, isotope analyses were performed on bulk carbonate, bivalve calcitic-shell (Trichites) calcite vein samples from two stratigraphic sections (Tosos Fuendetodos, present-day distance 15km), representing proximal inner- distal mid-ramp environments, respectively, uppermost Kimmeridgian ramp facies deposited in northern Iberian Basin (NE Spain). These successions underwent different diagenetic pathways that altered primary composition each section ways. Different burial histories, tectonic uplift a variable exposure to meteoric diagenesis end Cenozoic (following Alpine uplift) are reflected alteration patterns signatures. A significant deviation lower values both δ13O δ18O is recorded those mostly exposed (distal Fuendetodos section), because (telogenesis). On other hand, deposits mainly affected by (proximal inner-ramp Tosos section) only low with respect expected for pristine carbonates. The histories these sector, due their evolution part basin, resulted degree resetting. However, spite resetting reported signatures section, show similar cement types termsof fabrics cathodoluminescence properties. prevents use records addressing interpretations, instead highlights useful features regarding overprint studied carbonate concerning specific history.
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ژورنال
عنوان ژورنال: Geologica Acta
سال: 2021
ISSN: ['1695-6133', '1696-5728']
DOI: https://doi.org/10.1344/geologicaacta2021.19.14