Hallazgo del primer seep fósil en la costa emergida de Chile central (33°56' S). Caracterización e implicancias

Ximena Contardo-Berríos, Emilio Mena-Hodges, Eduardo Quiroga

Resultado de la investigación: Article

1 Cita (Scopus)

Resumen

This study presents the main characteristics of the first fossil hydrocarbon seep documented on the emerged coast of Central Chile. The Navidad Paleoseep (NPS) is an outcrop of carbonate and fossil organisms preserved on the beach of the Navidad locality. The carbonate structure is oriented N45° W, perpendicular to the coastline and discordant with sub horizontal Miocene sequences found in the area. This type of authigenic carbonate accumulation, originates on the sea floor as the result of anaerobic oxidation of methane, generated by low temperature fluids released through seafloor fractures. The NPS consists mainly of calcium carbonate in the form of matrix and crystallized precipitate. Based on textural features, dominant facies of the outcrop were defined as mudstone and wackestone. The associated mineralogy consists of magnesian calcite, predominantly as micrite matrix, minor components of quartz, albite, amphibole, orthoclase, microcline and fragments of volcanic lithics are also identified. The NPS also contains a variety of fossils, such as bivalves, gastropods, tube worms, teredolites, microbialites and others. The occurrence of Lucinoma promaucana in the paleoseep, evidences a temporal and spatial correlation with the Navidad Formation i.e., would ranges from lower to middle Miocene. The δ13C values vary between -41.4‰ in the matrix and -29.5‰ PDB in bivalve shells, representing the typical negative δ13C values seen in hydrocarbon seeps.

Idioma originalSpanish
Páginas (desde-hasta)213-228
Número de páginas16
PublicaciónAndean Geology
Volumen44
N.º2
DOI
EstadoPublished - 2017

Huella dactilar

Carbonates
hydrocarbon seep
Coastal zones
Calcium Carbonate
fossil
Hydrocarbons
carbonate
matrix
bivalve
coast
outcrop
seafloor
Amphibole Asbestos
Miocene
orthoclase
micrite
Quartz
microcline
Mineralogy
Methane

ASJC Scopus subject areas

  • Geology
  • Geochemistry and Petrology
  • Stratigraphy
  • Palaeontology

Citar esto

Contardo-Berríos, Ximena ; Mena-Hodges, Emilio ; Quiroga, Eduardo. / Hallazgo del primer seep fósil en la costa emergida de Chile central (33°56' S). Caracterización e implicancias. En: Andean Geology. 2017 ; Vol. 44, N.º 2. pp. 213-228.
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abstract = "This study presents the main characteristics of the first fossil hydrocarbon seep documented on the emerged coast of Central Chile. The Navidad Paleoseep (NPS) is an outcrop of carbonate and fossil organisms preserved on the beach of the Navidad locality. The carbonate structure is oriented N45° W, perpendicular to the coastline and discordant with sub horizontal Miocene sequences found in the area. This type of authigenic carbonate accumulation, originates on the sea floor as the result of anaerobic oxidation of methane, generated by low temperature fluids released through seafloor fractures. The NPS consists mainly of calcium carbonate in the form of matrix and crystallized precipitate. Based on textural features, dominant facies of the outcrop were defined as mudstone and wackestone. The associated mineralogy consists of magnesian calcite, predominantly as micrite matrix, minor components of quartz, albite, amphibole, orthoclase, microcline and fragments of volcanic lithics are also identified. The NPS also contains a variety of fossils, such as bivalves, gastropods, tube worms, teredolites, microbialites and others. The occurrence of Lucinoma promaucana in the paleoseep, evidences a temporal and spatial correlation with the Navidad Formation i.e., would ranges from lower to middle Miocene. The δ13C values vary between -41.4‰ in the matrix and -29.5‰ PDB in bivalve shells, representing the typical negative δ13C values seen in hydrocarbon seeps.",
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Hallazgo del primer seep fósil en la costa emergida de Chile central (33°56' S). Caracterización e implicancias. / Contardo-Berríos, Ximena; Mena-Hodges, Emilio; Quiroga, Eduardo.

En: Andean Geology, Vol. 44, N.º 2, 2017, p. 213-228.

Resultado de la investigación: Article

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