Reconstruction of the Miocene western Amazonian aquatic system using molluscan isotopic signatures.

H.B. Vonhof, F.P Wesselingh, G.M. Ganssen

Research output: Contribution to JournalArticleAcademic

Abstract

Strontium isotopic ratios and Sr contents of molluscs from the Miocene Pebas Formation in Colombian Amazonia indicate that the bulk of the Pebas Formation was deposited in a freshwater environment, predominantly draining the Andes, with minor contribution from the shield regions. The molluscan oxygen and carbon isotopic composition does not provide a palaeosalinity proxy, but points to a lacustrine palaeoenvironment. The faunal character confirms such an interpretation. Sr isotopic ratios further suggest that a marine incursion that reached the area was composed of a mixture of shield-derived freshwater and seawater, with a maximum salinity of about 5 psu. Faunistic components of this incursion-level support a shield-seawater mixing. The incursion most likely reached western Amazonia from the north, probably along the western Guyana shield.
Original languageEnglish
Pages (from-to)85-93
JournalPalaeogeography, Palaeoclimatology, Palaeoecology
Volume141
DOIs
Publication statusPublished - 1998

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Amazonia
shield
seawater
Miocene
Guyana
strontium
isotopic ratio
molluscs
paleosalinity
salinity
oxygen
faunistics
freshwater environment
carbon
paleoenvironment
mollusc
isotopic composition

Cite this

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title = "Reconstruction of the Miocene western Amazonian aquatic system using molluscan isotopic signatures.",
abstract = "Strontium isotopic ratios and Sr contents of molluscs from the Miocene Pebas Formation in Colombian Amazonia indicate that the bulk of the Pebas Formation was deposited in a freshwater environment, predominantly draining the Andes, with minor contribution from the shield regions. The molluscan oxygen and carbon isotopic composition does not provide a palaeosalinity proxy, but points to a lacustrine palaeoenvironment. The faunal character confirms such an interpretation. Sr isotopic ratios further suggest that a marine incursion that reached the area was composed of a mixture of shield-derived freshwater and seawater, with a maximum salinity of about 5 psu. Faunistic components of this incursion-level support a shield-seawater mixing. The incursion most likely reached western Amazonia from the north, probably along the western Guyana shield.",
author = "H.B. Vonhof and F.P Wesselingh and G.M. Ganssen",
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Reconstruction of the Miocene western Amazonian aquatic system using molluscan isotopic signatures. / Vonhof, H.B.; Wesselingh, F.P; Ganssen, G.M.

In: Palaeogeography, Palaeoclimatology, Palaeoecology, Vol. 141, 1998, p. 85-93.

Research output: Contribution to JournalArticleAcademic

TY - JOUR

T1 - Reconstruction of the Miocene western Amazonian aquatic system using molluscan isotopic signatures.

AU - Vonhof, H.B.

AU - Wesselingh, F.P

AU - Ganssen, G.M.

PY - 1998

Y1 - 1998

N2 - Strontium isotopic ratios and Sr contents of molluscs from the Miocene Pebas Formation in Colombian Amazonia indicate that the bulk of the Pebas Formation was deposited in a freshwater environment, predominantly draining the Andes, with minor contribution from the shield regions. The molluscan oxygen and carbon isotopic composition does not provide a palaeosalinity proxy, but points to a lacustrine palaeoenvironment. The faunal character confirms such an interpretation. Sr isotopic ratios further suggest that a marine incursion that reached the area was composed of a mixture of shield-derived freshwater and seawater, with a maximum salinity of about 5 psu. Faunistic components of this incursion-level support a shield-seawater mixing. The incursion most likely reached western Amazonia from the north, probably along the western Guyana shield.

AB - Strontium isotopic ratios and Sr contents of molluscs from the Miocene Pebas Formation in Colombian Amazonia indicate that the bulk of the Pebas Formation was deposited in a freshwater environment, predominantly draining the Andes, with minor contribution from the shield regions. The molluscan oxygen and carbon isotopic composition does not provide a palaeosalinity proxy, but points to a lacustrine palaeoenvironment. The faunal character confirms such an interpretation. Sr isotopic ratios further suggest that a marine incursion that reached the area was composed of a mixture of shield-derived freshwater and seawater, with a maximum salinity of about 5 psu. Faunistic components of this incursion-level support a shield-seawater mixing. The incursion most likely reached western Amazonia from the north, probably along the western Guyana shield.

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DO - 10.1016/S0031-0182(98)00010-8

M3 - Article

VL - 141

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EP - 93

JO - Palaeogeography, Palaeoclimatology, Palaeoecology

JF - Palaeogeography, Palaeoclimatology, Palaeoecology

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