Using geochemistry to establish the igneous provenances of the Neogene continental sedimentary rocks in the Central Depression and Altiplano, Central Andes

Luisa Pinto, Gérard Hérail, Bernard Moine, François Fontan, Reynaldo Charrier, Bernard Dupré

Resultado de la investigación: Article

20 Citas (Scopus)

Resumen

Geochemical and mineralogical data from ancient sedimentary strata can be reliable indicators of the provenance of sediments. The heavy mineral assemblages and the major and trace element contents of sedimentary rocks from the Neogene continental successions of the Central Depression in Chile and the Mauri and Corque Basins in the Altiplano of Bolivia reflect volcanic source rocks with different degrees of magmatic differentiation and alkalinity. These results indicate that the source rocks of the Central Depression were less differentiated (andesite to rhyodacite) than those of the Altiplano basins (rhyodacite to rhyolite). The low concentration (cations per formula unit) of total Al (<0.15 pfu) and [Ca+Na] (∼0.82 pfu) in the detrital clinopyroxenes and low [Nb/Y] ratio (<0.7) of whole-rock analyses of sandstones from the Central Depression indicate erosion of a calc-alkaline source rock. By contrast, the high concentration of total Al (>0.15 pfu) and [Ca+Na] (∼0.92 pfu), the variable Ti content (0.01-0.04 pfu) of the clinopyroxenes and the high [Nb/Y] (>0.7) in whole-rock analyses of sandstones from the Mauri Basin indicate erosion of alkaline rock sources. Locally, the low concentration of total Al (<0.15 pfu) in the detrital clinopyroxenes of sandstones from the Corque Basin indicates erosion of a subalkaline source rock. The chemical trends in the sandstones are similar to those in volcanic suites from the Western Cordillera and Eastern Cordillera of the Central Andes.

Idioma originalEnglish
Páginas (desde-hasta)157-183
Número de páginas27
PublicaciónSedimentary Geology
Volumen166
N.º1-2
DOI
EstadoPublished - 1 abr 2004

Huella dactilar

Neogene
provenance
sedimentary rock
geochemistry
source rock
sandstone
cordillera
basin
erosion
magmatic differentiation
alkaline rock
heavy mineral
rhyolite
andesite
alkalinity
volcanic rock
cation
trace element
rock
sediment

ASJC Scopus subject areas

  • Geology
  • Stratigraphy

Citar esto

Pinto, Luisa ; Hérail, Gérard ; Moine, Bernard ; Fontan, François ; Charrier, Reynaldo ; Dupré, Bernard. / Using geochemistry to establish the igneous provenances of the Neogene continental sedimentary rocks in the Central Depression and Altiplano, Central Andes. En: Sedimentary Geology. 2004 ; Vol. 166, N.º 1-2. pp. 157-183.
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abstract = "Geochemical and mineralogical data from ancient sedimentary strata can be reliable indicators of the provenance of sediments. The heavy mineral assemblages and the major and trace element contents of sedimentary rocks from the Neogene continental successions of the Central Depression in Chile and the Mauri and Corque Basins in the Altiplano of Bolivia reflect volcanic source rocks with different degrees of magmatic differentiation and alkalinity. These results indicate that the source rocks of the Central Depression were less differentiated (andesite to rhyodacite) than those of the Altiplano basins (rhyodacite to rhyolite). The low concentration (cations per formula unit) of total Al (<0.15 pfu) and [Ca+Na] (∼0.82 pfu) in the detrital clinopyroxenes and low [Nb/Y] ratio (<0.7) of whole-rock analyses of sandstones from the Central Depression indicate erosion of a calc-alkaline source rock. By contrast, the high concentration of total Al (>0.15 pfu) and [Ca+Na] (∼0.92 pfu), the variable Ti content (0.01-0.04 pfu) of the clinopyroxenes and the high [Nb/Y] (>0.7) in whole-rock analyses of sandstones from the Mauri Basin indicate erosion of alkaline rock sources. Locally, the low concentration of total Al (<0.15 pfu) in the detrital clinopyroxenes of sandstones from the Corque Basin indicates erosion of a subalkaline source rock. The chemical trends in the sandstones are similar to those in volcanic suites from the Western Cordillera and Eastern Cordillera of the Central Andes.",
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Using geochemistry to establish the igneous provenances of the Neogene continental sedimentary rocks in the Central Depression and Altiplano, Central Andes. / Pinto, Luisa; Hérail, Gérard; Moine, Bernard; Fontan, François; Charrier, Reynaldo; Dupré, Bernard.

En: Sedimentary Geology, Vol. 166, N.º 1-2, 01.04.2004, p. 157-183.

Resultado de la investigación: Article

TY - JOUR

T1 - Using geochemistry to establish the igneous provenances of the Neogene continental sedimentary rocks in the Central Depression and Altiplano, Central Andes

AU - Pinto, Luisa

AU - Hérail, Gérard

AU - Moine, Bernard

AU - Fontan, François

AU - Charrier, Reynaldo

AU - Dupré, Bernard

PY - 2004/4/1

Y1 - 2004/4/1

N2 - Geochemical and mineralogical data from ancient sedimentary strata can be reliable indicators of the provenance of sediments. The heavy mineral assemblages and the major and trace element contents of sedimentary rocks from the Neogene continental successions of the Central Depression in Chile and the Mauri and Corque Basins in the Altiplano of Bolivia reflect volcanic source rocks with different degrees of magmatic differentiation and alkalinity. These results indicate that the source rocks of the Central Depression were less differentiated (andesite to rhyodacite) than those of the Altiplano basins (rhyodacite to rhyolite). The low concentration (cations per formula unit) of total Al (<0.15 pfu) and [Ca+Na] (∼0.82 pfu) in the detrital clinopyroxenes and low [Nb/Y] ratio (<0.7) of whole-rock analyses of sandstones from the Central Depression indicate erosion of a calc-alkaline source rock. By contrast, the high concentration of total Al (>0.15 pfu) and [Ca+Na] (∼0.92 pfu), the variable Ti content (0.01-0.04 pfu) of the clinopyroxenes and the high [Nb/Y] (>0.7) in whole-rock analyses of sandstones from the Mauri Basin indicate erosion of alkaline rock sources. Locally, the low concentration of total Al (<0.15 pfu) in the detrital clinopyroxenes of sandstones from the Corque Basin indicates erosion of a subalkaline source rock. The chemical trends in the sandstones are similar to those in volcanic suites from the Western Cordillera and Eastern Cordillera of the Central Andes.

AB - Geochemical and mineralogical data from ancient sedimentary strata can be reliable indicators of the provenance of sediments. The heavy mineral assemblages and the major and trace element contents of sedimentary rocks from the Neogene continental successions of the Central Depression in Chile and the Mauri and Corque Basins in the Altiplano of Bolivia reflect volcanic source rocks with different degrees of magmatic differentiation and alkalinity. These results indicate that the source rocks of the Central Depression were less differentiated (andesite to rhyodacite) than those of the Altiplano basins (rhyodacite to rhyolite). The low concentration (cations per formula unit) of total Al (<0.15 pfu) and [Ca+Na] (∼0.82 pfu) in the detrital clinopyroxenes and low [Nb/Y] ratio (<0.7) of whole-rock analyses of sandstones from the Central Depression indicate erosion of a calc-alkaline source rock. By contrast, the high concentration of total Al (>0.15 pfu) and [Ca+Na] (∼0.92 pfu), the variable Ti content (0.01-0.04 pfu) of the clinopyroxenes and the high [Nb/Y] (>0.7) in whole-rock analyses of sandstones from the Mauri Basin indicate erosion of alkaline rock sources. Locally, the low concentration of total Al (<0.15 pfu) in the detrital clinopyroxenes of sandstones from the Corque Basin indicates erosion of a subalkaline source rock. The chemical trends in the sandstones are similar to those in volcanic suites from the Western Cordillera and Eastern Cordillera of the Central Andes.

KW - Altiplano

KW - Central Depression

KW - Clinopyroxene

KW - Geochemistry

KW - Neogene

KW - Source rock

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