Low Temperature Illitization through Illite-Dioctahedral Vermiculite Mixed Layers in a Tropical Saline Lake Rich in Hydrothermal Fluids (Sochagota Lake, Colombia)
| Autor: | Juan Jiménez-Millán, Javier Cuadros, Gabriel Ricardo Cifuentes, Rosario Jiménez-Espinosa, Claudia Patricia Quevedo, Fernando Nieto |
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| Přispěvatelé: | Ministerio de Ciencia, Innovación y Universidades (España), Junta de Andalucía |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Geochemistry
020101 civil engineering 02 engineering and technology engineering.material Vermiculite 010502 geochemistry & geophysics 01 natural sciences Hydrothermal circulation Illite–dioctahedral vermiculite mixed layers 0201 civil engineering Illitization hydrothermal inputs Kaolinite illite–dioctahedral vermiculite mixed layers Organic matter Quartz 0105 earth and related environmental sciences chemistry.chemical_classification Chemistry Sochagota Lake Geology Geotechnical Engineering and Engineering Geology Mineralogy illitization Illite engineering Sedimentary rock Hydrothermal inputs Clay minerals QE351-399.2 |
| Zdroj: | Minerals, Vol 11, Iss 523, p 523 (2021) Minerals Volume 11 Issue 5 Digital.CSIC. Repositorio Institucional del CSIC instname |
| Popis: | In this investigation, we showed that high salinity promoted by hydrothermal inputs, reducing conditions of sediments with high content in organic matter, and the occurrence of an appropriate clay mineral precursor provide a suitable framework for low-temperature illitization processes. We studied the sedimentary illitization process that occurs in carbonaceous sediments from a lake with saline waters (Sochagota Lake, Colombia) located at a tropical latitude. Water isotopic composition suggests that high salinity was produced by hydrothermal contribution. Materials accumulated in the Sochagota Lake’s southern entrance are organic matter-poor sediments that contain detrital kaolinite and quartz. On the other hand, materials formed at the central segment and near the lake exit (north portion) are enriched in organic matter and characterized by the crystallization of Fe-sulfides. X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), high resolution transmission electron microscopy (HRTEM), and energy dispersive X-ray spectrometry (EDX) data allowed for the identification of illite and illite-dioctahedral vermiculite mixed layers (I-DV), which are absent in the southern sediments. High humidity and temperate climate caused the formation of small-sized metastable intermediates of I-DV particles by the weathering of the source rocks in the Sochagota Lake Basin. These particles were deposited in the low-energy lake environments (middle and north part). The interaction of these sediments enriched in organic matter with the saline waters of the lake enriched in hydrothermal K caused a reducing environment that favored Fe mobilization processes and its incorporation to I-DV mixed layers that acted as mineral precursor for fast low temperature illitization, revealing that in geothermal areas clays in lakes favor a hydrothermal K uptake. This work has been financed by the Spanish research project PGC2018-094573-B-I00 from the MCIU-AEI-FEDER. and research group RNM-325 of the Junta de Andalucía (Spain). Our gratitude is also extended to Asociación Universitaria Iberoamericana de Posgrado (AUIP) and the Universidad de Boyacá. Additional thanks to Colombian Research groups Gestión Ambiental COL0005468 and Gestión de Recursos Hídricos COL0005477. |
| Databáze: | OpenAIRE |
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