Compositional characterization of the Upper Cretaceous sandstones in the Sierras Marginales y Exteriores (south-Pyrenean basin): Heavy-mineral and sandstone petrography analysis

David Gómez-Gras, Raül Collado, Xavier Coll, Marta Roigé

Research output: Contribution to journalArticleResearchpeer-review

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Abstract

Copyright© 2017 Sociedad Geológica de España Heavy-mineral analysis allows constraining provenance of detrital materials as well as their diagenetic history and the energetic characteristics of depositional environment. This technique, coupled with sandstone petrography, is applied for the first time to the Upper Cretaceous materials of the south-central Pyrenean basin, in the Sierras Marginales and Sierras Exteriores. The present paper determines the heavy-mineral suites and the petrography of the Santonian and Maastrichtian materials during a key moment of the south-central Pyrenean basin evolution, in which the inversion of the previous extensional basins occurs together with the earliest record of the detrital sedimentation of the foreland basin. The impoverished heavy-mineral assemblages, together with the high compositional maturity displayed by the Upper Cretaceous sandstones of the south-central Pyrenean basin (quartzarenites and K-feldspar arkoses), suggest that these sediments where affected by an intense dissolution which have strongly modified their original signal. Such composition was modified due to weathering processes that occurred at the source area,to mechanical breakdown during transport and to diagenesis during burial accompanied by acid-water circulation.
Original languageEnglish
Pages (from-to)163-166
JournalGeogaceta
Volume61
Publication statusPublished - 1 Jan 2017

Keywords

  • Heavy-minerals
  • Petrography
  • Raman spectroscopy
  • South-Pyrenean basin
  • Upper Cretaceous

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