Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Environmental significance of kaolinite variability over the last centuries in crater lake sediments from Central Mexico
Abstract Environmental conditions have a notable impact on clay minerals, primarily because of the chemical reactions they undergo with their immediate environment. These reactions are more pronounced in hot and humid tropical regions, and therefore, the study of clays deposited at the bottom of lakes in tropical regions can yield valuable insight into past environmental conditions. Here we present multiproxy records, including physical (magnetic susceptibility, grey-scale level and grain size), mineralogical (X-ray diffraction, Simultaneous Thermal Analysis, Fourier-Transform Infrared Spectroscopy), and geochemical (elemental composition by XRF-core scanner, organic geochemistry by IRMS) data, from three 210Pb-dated sediment cores (spanning recent centuries < 1470 CE) retrieved from crater lakes Los Espinos, Tacámbaro and Teremendo in the Trans-Mexican Volcanic Belt (TMVB), central Mexico. The mineralogical results showed that disordered kaolinite, formed by hydrolysis and hydrothermal alteration, was the predominant mineral in the sediments of the three lakes. The abundance of kaolinite changed in line with organic carbon and organic matter-related elements (Br, S and Ni) and showed opposite trends with lithogenic elements (Ti, K, and Fe). The geochemical data further suggested that increases in kaolinite abundance are linked to the formation of organo-mineral aggregates related to periods of elevated lake productivity that in turn may reflect lake level changes in the closed basins. In Lake Tacámbaro, following the construction of a canal in the early 20th century and subsequent regulation of lake level, the relationship between organic material and kaolinite was no longer present.
Highlights Crater lakes of the Trans-Mexican Volcanic Belt (TMVB) are valuable archives of past environmental conditions in the tropics Small crater lakes in the TMVB respond sensitively to sediment supplies transported by runoff Kaolinite is the dominant clay mineral in the sedimentary records of the TMVB The abundance of kaolinite indirectly reflects variations in the lake levels under natural conditions
Environmental significance of kaolinite variability over the last centuries in crater lake sediments from Central Mexico
Abstract Environmental conditions have a notable impact on clay minerals, primarily because of the chemical reactions they undergo with their immediate environment. These reactions are more pronounced in hot and humid tropical regions, and therefore, the study of clays deposited at the bottom of lakes in tropical regions can yield valuable insight into past environmental conditions. Here we present multiproxy records, including physical (magnetic susceptibility, grey-scale level and grain size), mineralogical (X-ray diffraction, Simultaneous Thermal Analysis, Fourier-Transform Infrared Spectroscopy), and geochemical (elemental composition by XRF-core scanner, organic geochemistry by IRMS) data, from three 210Pb-dated sediment cores (spanning recent centuries < 1470 CE) retrieved from crater lakes Los Espinos, Tacámbaro and Teremendo in the Trans-Mexican Volcanic Belt (TMVB), central Mexico. The mineralogical results showed that disordered kaolinite, formed by hydrolysis and hydrothermal alteration, was the predominant mineral in the sediments of the three lakes. The abundance of kaolinite changed in line with organic carbon and organic matter-related elements (Br, S and Ni) and showed opposite trends with lithogenic elements (Ti, K, and Fe). The geochemical data further suggested that increases in kaolinite abundance are linked to the formation of organo-mineral aggregates related to periods of elevated lake productivity that in turn may reflect lake level changes in the closed basins. In Lake Tacámbaro, following the construction of a canal in the early 20th century and subsequent regulation of lake level, the relationship between organic material and kaolinite was no longer present.
Highlights Crater lakes of the Trans-Mexican Volcanic Belt (TMVB) are valuable archives of past environmental conditions in the tropics Small crater lakes in the TMVB respond sensitively to sediment supplies transported by runoff Kaolinite is the dominant clay mineral in the sedimentary records of the TMVB The abundance of kaolinite indirectly reflects variations in the lake levels under natural conditions
Environmental significance of kaolinite variability over the last centuries in crater lake sediments from Central Mexico
Fagel, Nathalie (Autor:in) / Israde-Alcántara, Isabel (Autor:in) / Safaierad, Reza (Autor:in) / Rantala, Marttiina (Autor:in) / Schmidt, Sabine (Autor:in) / Lepoint, Gilles (Autor:in) / Pellenard, Pierre (Autor:in) / Mattielli, Nadine (Autor:in) / Metcalfe, Sarah (Autor:in)
Applied Clay Science ; 247
06.11.2023
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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