New geophysical evidences of the presence of a buried caldera in Laguna Pozuelos, Northern Puna

In the southern border of Laguna de Pozuelos Basin, the Pan de Azúcar volcanic complex crops out. It consists of several dacitic volcanic dome centers of ~ 12 Ma. Previous interpretation of seismic lines and a detailed ground magnetic survey indicated the presence of buried intrusive bodies. The det...

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Autor principal:	Prezzi, Claudia Beatriz
Publicado:	2010
Materias:	Caldera system Gravity and magnetic anomalies Middle Miocene Northern Puna Bouguer anomaly caldera dacite dome gravity anomaly magnetic anomaly magnetic survey Miocene Argentina Jujuy Pozuelos Lake Puna
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v66_n1-2_p282_Prezzi http://hdl.handle.net/20.500.12110/paper_00044822_v66_n1-2_p282_Prezzi
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00044822_v66_n1-2_p282_Prezzi
record_format	dspace
spelling	paper:paper_00044822_v66_n1-2_p282_Prezzi2023-06-08T14:26:23Z New geophysical evidences of the presence of a buried caldera in Laguna Pozuelos, Northern Puna Prezzi, Claudia Beatriz Caldera system Gravity and magnetic anomalies Middle Miocene Northern Puna Bouguer anomaly caldera dacite dome gravity anomaly magnetic anomaly magnetic survey Miocene Argentina Jujuy Pozuelos Lake Puna In the southern border of Laguna de Pozuelos Basin, the Pan de Azúcar volcanic complex crops out. It consists of several dacitic volcanic dome centers of ~ 12 Ma. Previous interpretation of seismic lines and a detailed ground magnetic survey indicated the presence of buried intrusive bodies. The determination of the existence of buried bodies has two major implications: 1) these volcanic complexes are closely associated with ore deposits (as part of the Bolivian tin ore polymetallic belt); and 2) the existence of a large ancient caldera (~12 Ma) beneath the central and southern part of the Laguna de Pozuelos Basin, covered by the infilling sediments was previously suggested. The volcanic complexes would represent the final stages of such a calderic magmatic system. In order to confirm the existence of other buried intrusives and/or a buried caldera system, detailed ground magnetic and gravity surveys were carried out. The magnetic map is dominated by positive and negative anomalies in the southern sector of the basin, associated with the dacitic domes. The residual Bouguer anomaly presents a semicircular pattern, having only positive values. We applied the curvature technique to analyse the magnetic and gravity signals and used Euler deconvolution to estimate the depth to the sources. Our results would support the hypothesis of a large caldera buried beneath the Laguna de Pozuelos Basin. The identification of such a large Middle Miocene caldera would bring new insight into the magmatic evolution of the northern Puna. Fil:Prezzi, C.B. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2010 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v66_n1-2_p282_Prezzi http://hdl.handle.net/20.500.12110/paper_00044822_v66_n1-2_p282_Prezzi
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Caldera system Gravity and magnetic anomalies Middle Miocene Northern Puna Bouguer anomaly caldera dacite dome gravity anomaly magnetic anomaly magnetic survey Miocene Argentina Jujuy Pozuelos Lake Puna
spellingShingle	Caldera system Gravity and magnetic anomalies Middle Miocene Northern Puna Bouguer anomaly caldera dacite dome gravity anomaly magnetic anomaly magnetic survey Miocene Argentina Jujuy Pozuelos Lake Puna Prezzi, Claudia Beatriz New geophysical evidences of the presence of a buried caldera in Laguna Pozuelos, Northern Puna
topic_facet	Caldera system Gravity and magnetic anomalies Middle Miocene Northern Puna Bouguer anomaly caldera dacite dome gravity anomaly magnetic anomaly magnetic survey Miocene Argentina Jujuy Pozuelos Lake Puna
description	In the southern border of Laguna de Pozuelos Basin, the Pan de Azúcar volcanic complex crops out. It consists of several dacitic volcanic dome centers of ~ 12 Ma. Previous interpretation of seismic lines and a detailed ground magnetic survey indicated the presence of buried intrusive bodies. The determination of the existence of buried bodies has two major implications: 1) these volcanic complexes are closely associated with ore deposits (as part of the Bolivian tin ore polymetallic belt); and 2) the existence of a large ancient caldera (~12 Ma) beneath the central and southern part of the Laguna de Pozuelos Basin, covered by the infilling sediments was previously suggested. The volcanic complexes would represent the final stages of such a calderic magmatic system. In order to confirm the existence of other buried intrusives and/or a buried caldera system, detailed ground magnetic and gravity surveys were carried out. The magnetic map is dominated by positive and negative anomalies in the southern sector of the basin, associated with the dacitic domes. The residual Bouguer anomaly presents a semicircular pattern, having only positive values. We applied the curvature technique to analyse the magnetic and gravity signals and used Euler deconvolution to estimate the depth to the sources. Our results would support the hypothesis of a large caldera buried beneath the Laguna de Pozuelos Basin. The identification of such a large Middle Miocene caldera would bring new insight into the magmatic evolution of the northern Puna.
author	Prezzi, Claudia Beatriz
author_facet	Prezzi, Claudia Beatriz
author_sort	Prezzi, Claudia Beatriz
title	New geophysical evidences of the presence of a buried caldera in Laguna Pozuelos, Northern Puna
title_short	New geophysical evidences of the presence of a buried caldera in Laguna Pozuelos, Northern Puna
title_full	New geophysical evidences of the presence of a buried caldera in Laguna Pozuelos, Northern Puna
title_fullStr	New geophysical evidences of the presence of a buried caldera in Laguna Pozuelos, Northern Puna
title_full_unstemmed	New geophysical evidences of the presence of a buried caldera in Laguna Pozuelos, Northern Puna
title_sort	new geophysical evidences of the presence of a buried caldera in laguna pozuelos, northern puna
publishDate	2010
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v66_n1-2_p282_Prezzi http://hdl.handle.net/20.500.12110/paper_00044822_v66_n1-2_p282_Prezzi
work_keys_str_mv	AT prezziclaudiabeatriz newgeophysicalevidencesofthepresenceofaburiedcalderainlagunapozuelosnorthernpuna
_version_	1768544389864357888

New geophysical evidences of the presence of a buried caldera in Laguna Pozuelos, Northern Puna

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