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Sedimentology and mineralogy of surface sediments from the Chilean continental margin

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.

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Cite this as

Lamy, Frank, Hebbeln, Dierk, Wefer, Gerold (1998). Dataset: Sedimentology and mineralogy of surface sediments from the Chilean continental margin. https://doi.org/10.1594/PANGAEA.711825

DOI retrieved: 1998

Additional Info

Field Value
Imported on November 30, 2024
Last update November 30, 2024
License CC-BY-3.0
Source https://doi.org/10.1594/PANGAEA.711825
Author Lamy, Frank
Given Name Frank
Family Name Lamy
More Authors
Hebbeln, Dierk
Wefer, Gerold
Source Creation 1998
Publication Year 1998
Resource Type application/zip - filename: Lamy_1998
Subject Areas
Name: Lithosphere

Related Identifiers
Title: Terrigenous sediment supply along the Chilean continental margin: modern regional patterns of texture and composition
Identifier: https://doi.org/10.1007/s005310050223
Type: DOI
Relation: IsSupplementTo
Year: 1998
Source: Geologische Rundschau
Authors: Lamy Frank , Hebbeln Dierk , Wefer Gerold .

Title: Spätquartäre Variationen des terrigenen Sedimenteintrags entlang des chilenischen Kontinentalhangs als Abbild von Klimavariabilität im Milankovic- und Sub-Milankovic-Zeitbereich
Identifier: urn:nbn:de:gbv:46-ep000102397
Type: DOI
Relation: References
Year: 1998
Source: Berichte aus dem Fachbereich Geowissenschaften der Universität Bremen
Authors: Lamy Frank .