Impactos en Mauritanianuevos datos mineralógicos, texturales y geoquímicos de las megabrechas de Richat y del cráter meteorítico de Aouelloul

  1. Jesús Martínez Frías 1
  2. Francisco García-Talavera Casañas 2
  3. Fernando Rull Pérez 3
  4. Fernando López-Vera 4
  5. Ramón Capote del Villar 5
  6. J. M. Navarro La Torre 2
  7. Lázaro Sánchez Pinto 2
  8. José López Rondón 2
  9. José Antonio Rodríguez Losada 6
  10. María Teresa Fernández Sampedro 1
  11. Maria Paz Martin-Redondo 1
  12. César Menor Salván 1
  1. 1 Centro de Astrobiología, CSIC/INTA, Instituto Nacional de Técnica Aeroespacial, Ctra., Torrejón de Ardoz, Madrid
  2. 2 Museo de Ciencias Naturales, Organismo Autónomo de Museos y Centros, Santa Cruz de Tenerife, Tenerife, Islas Canarias
  3. 3 Cristalografía y Mineralogía, Unidad Asociada CSIC-Universidad de Valladolid, Facultad de Ciencias
  4. 4 Departamento de Geología y Geoquímica, Facultad de Ciencias, C-VI, Universidad Autónoma de Madrid
  5. 5 Departamento de Geodinámica, Facultad de Ciencias Geológicas, Universidad Complutense de Madrid
  6. 6 Departamento de Edafología y Geología, Universidad de La Laguna
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Journal:
Geotemas (Madrid)

ISSN: 1576-5172

Year of publication: 2008

Issue Title: VII Congreso Geológico de España

Issue: 10

Pages: 1487-1490

Type: Article

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Abstract

This contribution presents first results from the research on meteorite impact craters and events in Mauritania. Megabreccias from the remarkable (and controversial) Richat structure and materials from the Aoulloul impact crater were studied by the combination of transmitted and reflected light microscopy, XRD, SEM-EDX, ICP-MS, FT-IR and Raman spectroscopy. Quartz, analcime, goethite, haematite, calcite, dolomite and sulphides (pyrite) were identified as main minerals of the megabreccias. Their textures comprise collomorphous layers and aggregates, cloudy textures, infillings of veins and cracks and quartz recrystallization, and heterometric quartz grains showing corroded gulfs. Some samples from Richat show mosaicism in quartz and amorphized carbon. In general, the megabreccias are geochemically heterogeneous, displaying significant variations in some elements (mainly Na, K, Ti, Cr, V, Co, Cu, Sr, Ba y Ni). Intensely deformed rocks (quartz mosaicism), and iron rich and glass fragments from the Aouelloul impact crater were also studied

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