Sedimentology and mineralogy of surface sediments from the Chilean continental margin

DOI

The regional patterns of texture and composition of modern continental slope and pelagic sediments off Chile between 25°S and 43°S reflect the latitudinal segmentation of geological, morphological, and climatic features of the continental hinterland. Grain-size characteristics are controlled by the grain-size of source rocks, the weathering regime, and mode of sediment input (eolian off northern Chile vs fluvial further south). Bulk-mineral assemblages reveal a low grade of maturity. Regional variations are governed by the source-rock composition of the different geological terranes and the relative source-rock contribution of the Coastal Range and Andes, as controlled by the continental hydrology. The relative abundance of clay minerals is also predominantly influenced by the source-rock composition and partly by continental smectite neoformation. Latitudinal variations of illite crystallinities along the Chilean continental slope (and west of the Peru-Chile trench) clearly reflect modifications of the weathering regime which correspond to the strong climatic zonation of Chile.

Supplement to: Lamy, Frank; Hebbeln, Dierk; Wefer, Gerold (1998): Terrigenous sediment supply along the Chilean continental margin: modern regional patterns of texture and composition. Geologische Rundschau, 87(3), 477-494

Identifier
DOI https://doi.org/10.1594/PANGAEA.711825
Related Identifier IsSupplementTo https://doi.org/10.1007/s005310050223
Related Identifier References https://nbn-resolving.org/urn:nbn:de:gbv:46-ep000102397
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.711825
Provenance
Creator Lamy, Frank ORCID logo; Hebbeln, Dierk ORCID logo; Wefer, Gerold ORCID logo
Publisher PANGAEA
Publication Year 1998
Rights Creative Commons Attribution 3.0 Unported; https://creativecommons.org/licenses/by/3.0/
OpenAccess true
Representation
Resource Type Supplementary Publication Series of Datasets; Collection
Format application/zip
Size 3 datasets
Discipline Earth System Research
Spatial Coverage (-81.000W, -43.240S, -71.172E, -25.220N); South-East Pacific; Iquique-Ridge; off Chile
Temporal Coverage Begin 1994-03-11T00:00:00Z
Temporal Coverage End 1995-06-12T00:00:00Z