Tips on the SW-Gondwana margin: Ordovician conodont-graptolite biostratigraphy of allochthonous blocks in the Rinconada mélange, Argentine Precordillera

ABSTRACT The Rinconada Formation is a mélange that crops out in the eastern margin of the Argentine Precordillera, an exotic terrane accreted to Gondwana in Ordovician times. Its gravity-driven deposits have been studied by means of conodont and graptolite biostratigraphy, and complemented with stra...

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Autores principales:	Voldman,Gustavo G., Alonso,Juan L., Fernández,Luis P., Ortega,Gladys, Albanesi,Guillermo L., Banchig,Aldo L., Cardó,Raúl
Lenguaje:	English
Publicado:	Servicio Nacional de Geología y Minería (SERNAGEOMIN) 2018
Materias:	Conodont Graptolite Biostratigraphy Rinconada Formation Mélange Argentine Precordillera Ordovician Silurian Lower Devonian
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062018000300399
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spelling	oai:scielo:S0718-710620180003003992018-11-05Tips on the SW-Gondwana margin: Ordovician conodont-graptolite biostratigraphy of allochthonous blocks in the Rinconada mélange, Argentine PrecordilleraVoldman,Gustavo G.Alonso,Juan L.Fernández,Luis P.Ortega,GladysAlbanesi,Guillermo L.Banchig,Aldo L.Cardó,Raúl Conodont Graptolite Biostratigraphy Rinconada Formation Mélange Argentine Precordillera Ordovician Silurian Lower Devonian ABSTRACT The Rinconada Formation is a mélange that crops out in the eastern margin of the Argentine Precordillera, an exotic terrane accreted to Gondwana in Ordovician times. Its gravity-driven deposits have been studied by means of conodont and graptolite biostratigraphy, and complemented with stratigraphic analyses. 46 rock samples (85 kg total weight) were obtained from blocks of limestones and of carbonate-cemented quartz-arenites, and from limestone clasts included in conglomerate blocks and debrites. 16 of these samples were productive after standard laboratory acid procedures, yielding 561 conodont elements. The specimens occur in variable number per sample and are frequently fragmented, but they reveal the occurrence of phantom stratigraphic units in the Darriwilian of the Precordillera. Lithological and fossil evidence from the Rinconada Formation provide new constraints on the biostratigraphy, palaebiogeography and tectonostratigraphic history of the southwestern margin of Gondwana during the Ordovician to Lower Devonian times.info:eu-repo/semantics/openAccessServicio Nacional de Geología y Minería (SERNAGEOMIN)Andean geology v.45 n.3 20182018-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062018000300399en10.5027/andgeov45n3-3095
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Conodont Graptolite Biostratigraphy Rinconada Formation Mélange Argentine Precordillera Ordovician Silurian Lower Devonian
spellingShingle	Conodont Graptolite Biostratigraphy Rinconada Formation Mélange Argentine Precordillera Ordovician Silurian Lower Devonian Voldman,Gustavo G. Alonso,Juan L. Fernández,Luis P. Ortega,Gladys Albanesi,Guillermo L. Banchig,Aldo L. Cardó,Raúl Tips on the SW-Gondwana margin: Ordovician conodont-graptolite biostratigraphy of allochthonous blocks in the Rinconada mélange, Argentine Precordillera
description	ABSTRACT The Rinconada Formation is a mélange that crops out in the eastern margin of the Argentine Precordillera, an exotic terrane accreted to Gondwana in Ordovician times. Its gravity-driven deposits have been studied by means of conodont and graptolite biostratigraphy, and complemented with stratigraphic analyses. 46 rock samples (85 kg total weight) were obtained from blocks of limestones and of carbonate-cemented quartz-arenites, and from limestone clasts included in conglomerate blocks and debrites. 16 of these samples were productive after standard laboratory acid procedures, yielding 561 conodont elements. The specimens occur in variable number per sample and are frequently fragmented, but they reveal the occurrence of phantom stratigraphic units in the Darriwilian of the Precordillera. Lithological and fossil evidence from the Rinconada Formation provide new constraints on the biostratigraphy, palaebiogeography and tectonostratigraphic history of the southwestern margin of Gondwana during the Ordovician to Lower Devonian times.
author	Voldman,Gustavo G. Alonso,Juan L. Fernández,Luis P. Ortega,Gladys Albanesi,Guillermo L. Banchig,Aldo L. Cardó,Raúl
author_facet	Voldman,Gustavo G. Alonso,Juan L. Fernández,Luis P. Ortega,Gladys Albanesi,Guillermo L. Banchig,Aldo L. Cardó,Raúl
author_sort	Voldman,Gustavo G.
title	Tips on the SW-Gondwana margin: Ordovician conodont-graptolite biostratigraphy of allochthonous blocks in the Rinconada mélange, Argentine Precordillera
title_short	Tips on the SW-Gondwana margin: Ordovician conodont-graptolite biostratigraphy of allochthonous blocks in the Rinconada mélange, Argentine Precordillera
title_full	Tips on the SW-Gondwana margin: Ordovician conodont-graptolite biostratigraphy of allochthonous blocks in the Rinconada mélange, Argentine Precordillera
title_fullStr	Tips on the SW-Gondwana margin: Ordovician conodont-graptolite biostratigraphy of allochthonous blocks in the Rinconada mélange, Argentine Precordillera
title_full_unstemmed	Tips on the SW-Gondwana margin: Ordovician conodont-graptolite biostratigraphy of allochthonous blocks in the Rinconada mélange, Argentine Precordillera
title_sort	tips on the sw-gondwana margin: ordovician conodont-graptolite biostratigraphy of allochthonous blocks in the rinconada mélange, argentine precordillera
publisher	Servicio Nacional de Geología y Minería (SERNAGEOMIN)
publishDate	2018
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062018000300399
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Tips on the SW-Gondwana margin: Ordovician conodont-graptolite biostratigraphy of allochthonous blocks in the Rinconada mélange, Argentine Precordillera

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