Transformation of S-Bearing Minerals in Organic Matter-Rich Sediments from a Saline Lake with Hydrothermal Inputs

Autor:	Claudia Patricia Quevedo, Juan Jiménez-Millán, Rosario Jiménez-Espinosa, Gabriel Ricardo Cifuentes
Rok vydání:	2020
Předmět:	lcsh:QE351-399.2 chemistry.chemical_element mackinawite 010501 environmental sciences engineering.material 010502 geochemistry & geophysics 01 natural sciences sedimentary sulfur uptake Hydrothermal circulation Mackinawite Kaolinite Organic matter 0105 earth and related environmental sciences chemistry.chemical_classification lcsh:Mineralogy Sochagota Lake hydrothermal sulfur Geology Geotechnical Engineering and Engineering Geology Sulfur pyrite elemental sulfur chemistry Environmental chemistry Illite engineering Pyrite Clay minerals
Zdroj:	Minerals, Vol 10, Iss 525, p 525 (2020) Minerals Volume 10 Issue 6
ISSN:	2075-163X
DOI:	10.3390/min10060525
Popis:	Geothermal systems can provide significant amounts of hydrothermal sulfur to surface waters, increasing salinity and avoiding some of the common anthropic uses. The objective of this study was to investigate the sedimentary neoformation of S-bearing phases in organic matter-rich sediments from a saline lake with hydrothermal inputs (Sochagota Lake, Colombia). Detrital kaolinite and quartz are the main minerals of the materials deposited in the Sochagota Lake. Neoformed clay minerals (illite and illite-dioctahedral vermiculite mixed layers) are concentrated in the central and northern part of the lake in sediments with high organic matter content. The most organic matter-rich materials are characterized by S-bearing minerals: mackinawite, pyrite, and elemental sulfur (S° ). FESEM, high-resolution transmission electron microscopy (HRTEM), EDS, and Raman microspectrometry have revealed the presence of cell-shape aggregates of mackinawite nanoparticles filling the inner part of plant fragments, indicating that microorganisms were involved in the hydrothermal sulfur uptake. The alteration of mackinawite in free sulfide excess environment produced the formation of framboidal pyrite. The evolution to conditions with the presence of oxygen favored the formation of complex S° morphologies.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8ede5195acf3f488963e007f2f59c587 https://doi.org/10.3390/min10060525 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
Nepřihlášeným uživatelům se plný text nezobrazuje	K zobrazení výsledku je třeba se přihlásit.