Evidence for an Early-Middle Miocene age of the Navidad Formation (central Chile): Paleontological, paleoclimatic and tectonic implications

The age of the Navidad Formation in central Chile has always been controversial, mainly due to the conflicting age ranges indicated by its macro- and microfossils. Macrofossils are generally interpreted as having been reworked from older, Early to Middle Miocene strata, whereas a Late Miocene-Plioce...

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Autores principales:	Gutiérrez,Néstor M, Hinojosa,Luis F, Le Roux,Jacobus P, Pedroza,Viviana
Lenguaje:	English
Publicado:	Servicio Nacional de Geología y Minería (SERNAGEOMIN) 2013
Materias:	Foraminifer index species Middle Miocene Climatic Optimum Andean tectonics Arid Diagonal
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062013000100003
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spelling	oai:scielo:S0718-710620130001000032014-09-08Evidence for an Early-Middle Miocene age of the Navidad Formation (central Chile): Paleontological, paleoclimatic and tectonic implicationsGutiérrez,Néstor MHinojosa,Luis FLe Roux,Jacobus PPedroza,Viviana Foraminifer index species Middle Miocene Climatic Optimum Andean tectonics Arid Diagonal The age of the Navidad Formation in central Chile has always been controversial, mainly due to the conflicting age ranges indicated by its macro- and microfossils. Macrofossils are generally interpreted as having been reworked from older, Early to Middle Miocene strata, whereas a Late Miocene-Pliocene age has been accepted on the basis of planktonic foraminifer index species. The results of this study, however, indicate that the macrofossils occur in situ, which necessitates a complete revision of the geochronological data. It is concluded that the evidence for an Early to Middle Miocene age is overwhelming, and that the planktonic foraminifer index species must have appeared in the SE Pacific earlier than elsewhere. These include Globoturborotalia apertura, Globorotalia puncticulata (Deshayes), Globorotalia spheriomizea (Walters), Neogloboquadrina pachyderma (Ehrenberg), and Neogloboquadrina acostaensis (Blow). An Early to Middle Miocene age for the Navidad Formation correlates well with a reinterpretation of its depo-sitional environment as a continental shelf instead of a deepwater continental slope, global and regional paleoclimatic events, and the tectonic development of the Andes Range.info:eu-repo/semantics/openAccessServicio Nacional de Geología y Minería (SERNAGEOMIN)Andean geology v.40 n.1 20132013-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062013000100003en10.5027/andgeoV40n1-a03
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Foraminifer index species Middle Miocene Climatic Optimum Andean tectonics Arid Diagonal
spellingShingle	Foraminifer index species Middle Miocene Climatic Optimum Andean tectonics Arid Diagonal Gutiérrez,Néstor M Hinojosa,Luis F Le Roux,Jacobus P Pedroza,Viviana Evidence for an Early-Middle Miocene age of the Navidad Formation (central Chile): Paleontological, paleoclimatic and tectonic implications
description	The age of the Navidad Formation in central Chile has always been controversial, mainly due to the conflicting age ranges indicated by its macro- and microfossils. Macrofossils are generally interpreted as having been reworked from older, Early to Middle Miocene strata, whereas a Late Miocene-Pliocene age has been accepted on the basis of planktonic foraminifer index species. The results of this study, however, indicate that the macrofossils occur in situ, which necessitates a complete revision of the geochronological data. It is concluded that the evidence for an Early to Middle Miocene age is overwhelming, and that the planktonic foraminifer index species must have appeared in the SE Pacific earlier than elsewhere. These include Globoturborotalia apertura, Globorotalia puncticulata (Deshayes), Globorotalia spheriomizea (Walters), Neogloboquadrina pachyderma (Ehrenberg), and Neogloboquadrina acostaensis (Blow). An Early to Middle Miocene age for the Navidad Formation correlates well with a reinterpretation of its depo-sitional environment as a continental shelf instead of a deepwater continental slope, global and regional paleoclimatic events, and the tectonic development of the Andes Range.
author	Gutiérrez,Néstor M Hinojosa,Luis F Le Roux,Jacobus P Pedroza,Viviana
author_facet	Gutiérrez,Néstor M Hinojosa,Luis F Le Roux,Jacobus P Pedroza,Viviana
author_sort	Gutiérrez,Néstor M
title	Evidence for an Early-Middle Miocene age of the Navidad Formation (central Chile): Paleontological, paleoclimatic and tectonic implications
title_short	Evidence for an Early-Middle Miocene age of the Navidad Formation (central Chile): Paleontological, paleoclimatic and tectonic implications
title_full	Evidence for an Early-Middle Miocene age of the Navidad Formation (central Chile): Paleontological, paleoclimatic and tectonic implications
title_fullStr	Evidence for an Early-Middle Miocene age of the Navidad Formation (central Chile): Paleontological, paleoclimatic and tectonic implications
title_full_unstemmed	Evidence for an Early-Middle Miocene age of the Navidad Formation (central Chile): Paleontological, paleoclimatic and tectonic implications
title_sort	evidence for an early-middle miocene age of the navidad formation (central chile): paleontological, paleoclimatic and tectonic implications
publisher	Servicio Nacional de Geología y Minería (SERNAGEOMIN)
publishDate	2013
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062013000100003
work_keys_str_mv	AT gutierreznestorm evidenceforanearlymiddlemioceneageofthenavidadformationcentralchilepaleontologicalpaleoclimaticandtectonicimplications AT hinojosaluisf evidenceforanearlymiddlemioceneageofthenavidadformationcentralchilepaleontologicalpaleoclimaticandtectonicimplications AT lerouxjacobusp evidenceforanearlymiddlemioceneageofthenavidadformationcentralchilepaleontologicalpaleoclimaticandtectonicimplications AT pedrozaviviana evidenceforanearlymiddlemioceneageofthenavidadformationcentralchilepaleontologicalpaleoclimaticandtectonicimplications
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Evidence for an Early-Middle Miocene age of the Navidad Formation (central Chile): Paleontological, paleoclimatic and tectonic implications

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