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Título:
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Diagenetic Origin of Bipyramidal Quartz and Hydrothermal Aragonites within the Upper Triassic Saline Succession of the Iberian Basin: Implications for Interpreting the Burial–Thermal Evolution of the Basin
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Autores:
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Herrero Fernández, María Josefa ;
Marfil, Rafaela ;
Escavy Fernández, José Ignacio ;
Al-Aasm, Ihsan ;
Scherer, Michael
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Tipo de documento:
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texto impreso
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Editorial:
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MDPI, 2020
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Dimensiones:
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application/pdf
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Nota general:
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cc_by
info:eu-repo/semantics/openAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Geología: Geoquímica
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Materia = Ciencias: Geología: Mineralogía
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Tipo = Artículo
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Resumen:
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Within the Upper Triassic successions in the Iberian Basin (Spain), the occurrence of both idiomorphic bipyramidal quartz crystals as well as pseudohexagonal aragonite crystals are related to mudstone and evaporite bearing sequences. Bipyramidal-euhedral quartz crystals occur commonly at widespread locations and similar idiomorphic crystals have been described in other formations and ages from Europe, America, Pakistan, and Africa. Similarly, pseudohexagonal aragonite crystals are located at three main sites in the Iberian Range and are common constituents of deposits of this age in France, Italy, and Morocco. This study presents a detailed description of the geochemical and mineralogical characteristics of the bipyramidal quartz crystals to decipher their time of formation in relation to the diagenetic evolution of the sedimentary succession in which they formed. Petrographic and scanning electron microscopy (SEM) analyses permit the separation of an inner part of quartz crystals with abundant anhydrite and organic-rich inclusions. This inner part resulted from near-surface recrystallization (silicification) of an anhydrite nodule, at temperatures that were
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En línea:
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https://eprints.ucm.es/59503/1/Diagenetic%20Origin%20of%20Bipyramidal%20Quartz%20and%20Hydrothermal%20Aragonites%20within%20the%20Upper%20Triassic.pdf
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