Morfología de cristales de dolomita en dolocretas y depósitos lacustres del Cenozoico de las Cuencas de Madrid y de Almazán

  1. P. Huerta 1
  2. A.I. Casado 2
  3. M. A. Bustillo 3
  4. I. Armenteros 1
  5. A.M. Alonso-Zarza 2
  1. 1 Universidad de Salamanca
    info

    Universidad de Salamanca

    Salamanca, España

    ROR https://ror.org/02f40zc51

  2. 2 Universidad Complutense de Madrid
    info

    Universidad Complutense de Madrid

    Madrid, España

    ROR https://ror.org/02p0gd045

  3. 3 Museo Nacional de Ciencias Naturales, CSIC
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Journal:
Geotemas (Madrid)

ISSN: 1576-5172

Year of publication: 2016

Issue Title: IX CONGRESO GEOLÓGICO DE ESPAÑA

Issue: 16

Pages: 633-636

Type: Article

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Abstract

This paper describes the dolomite crystal morphologies, observed under petrographic microscope and SEM, from dolocretes and carbonate-evaporitic lacustrine deposits. Samples analysed come from the Paleogene of the Almazán basin and the Miocene of the Madrid basin. Six morphotypes have been identified: 1) Dolomite tubes; 2) Vacuolar dolomite cylinders; 3) Rhombohedral dolomite crystals; 4) Spheroidal dolomite crystals; 5) Cocoon-shaped dolomite crystals; and 6) Dolomite dumbbells. Dominant morphotypes in dolocretes are: rhomboids; spheroids, and dumbbells. In lacustrine deposits the variety is higher and includes tubes, vacuolar dolomite cylinders, spheroids and cocoon-shaped dolomite crystals. Dolomite crystal morphology can be indicative of biotic or abiotic processes in dolomite precipitation, but other evidences must be taken into account to understand the influence of the mentioned processes.

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