Geochemistry of late quaternary sediments from Tecocomulco lake, central Mexico: Implication to chemical weathering and provenance
Por:
Roy, PD, Caballero, M, Lozano, R, Smykatz-Klossd, W
Publicada:
1 ene 2008
Resumen:
This paper presents the first detailed multi-element geochemical data from the late Quaternary sediments of the Tecocomulco lake basin (central Mexico) and rocks exposed in the basin catchments to understand the extents of chemical weathering and provenance of the siliciclastic fractions. Ternary diagrams of A-CN-K, A-C-N and A-CNK-FM and elemental ratios suggest that most of the lacustrine sediments were derived from mafic volcanic deposits comprising the Chichicuatla and the Apan-Penon andesites and the Apan-Tezontepec basaltic-andesites. The felsic tephra layers have chemical compositions comparable to the Acoculco volcanic sequences. The calculated indices of chemical weathering such as chemical index of alteration (CIA), plagioclase index of alteration (PIA) and chemical index of weathering (CIW) indicate low to extreme chemical weathering for the lacustrine sediments and low chemical weathering for tephra layers. The varying degree or chemical weathering in lacustrine sediments i
Filiaciones:
Roy, PD:
Univ Nacl Autonoma Mexico, Dept Geomagnetismo & Explorac, Inst Geofis, Mexico City 04510, DF, Mexico
Caballero, M:
Univ Nacl Autonoma Mexico, Dept Geomagnetismo & Explorac, Inst Geofis, Mexico City 04510, DF, Mexico
Lozano, R:
Univ Nacl Autonoma Mexico, Inst Geol, Mexico City 04510, DF, Mexico
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