Papers by Cecilia Pavon Pivetta
Relaciones de texturas macroscópicas con el contenido de Au-Ag en sondajes del Proyecto Arroyo Verde, Macizo Nordpatagónico
Acta geológica lilloana, 2016
The Charrarruca Porphyry-Type Alteration Zone: New Evidence of Mineralizing Late Cretaceous-Eocene Magmatism in the Southern Central Andes of Argentina
Social Science Research Network, 2022
Petrogenetic insights on tephritic magmatism from Davis Bank (South Atlantic Ocean - Vitória-Trindade Ridge (VTR), Brazil): The role of a CO2-enriched mantle source
Journal of South American Earth Sciences, Feb 1, 2023
Early Jurassic tectonomagmatic stages in the western North Patagonian Region, Argentina: insights from the Comallo volcanic sedimentary complex
International Geology Review
The Charrarruca Porphyry-Type Alteration Zone: New Evidence of Mineralizing Late Cretaceous-Eocene Magmatism in the Southern Central Andes of Argentina
SSRN Electronic Journal
New insights into the Jurassic polyphase strain partition on the patagonian back-arc; constraints from structural analysis of ancient volcanic structures
Tectonophysics
Una nueva localidad con alteración de greisen fue hallada asociada a la min - eralización de wolf... more Una nueva localidad con alteración de greisen fue hallada asociada a la min - eralización de wolframio del granito San Martín de edad pérmica en el Macizo Nordpatagónico. El greisen está constituido por muscovita-cuarzo y cantidades menores de apatita, turmalina y escasos cristales de topacio y circón. Se manifiesta en forma penetrativa relacionada al granito y en las salbandas de venas de cuarzo. El análisis químico de una roca greisenizada muestra un aumento en el contenido de Si, P, Sn, Hf, Zr y tierras raras con respecto al de la roca granítica original. Los análisis químicos realizados sobre la mica del greisen permi - tieron clasificarla como una muscovita 2M1. Los estudios de inclusiones fluidas revelan que los fluidos formadores del greisen presentan temperaturas de entrampamiento de 460 º C y bajas salinidades (4% en peso equivalente a NaCl). Los valores isotópicos calculados de d 18 O entre 11 y 13 ‰ y de d D entre -32 y -34 ‰ sobre muscovita, sugieren que el greisen se fo...
PROYECTO MINERO ARROYO VERDE, DEPÓSITO EPITERMAL DE Ag-Au EN EL MACIZO NORDPATAGÓNICO
Manifestación de greisen relacionada a la mineralización de wolframio de la Mina San Martín, Río Negro
espanolUna nueva localidad con alteracion de greisen fue hallada asociada a la mineralizacion de ... more espanolUna nueva localidad con alteracion de greisen fue hallada asociada a la mineralizacion de wolframio del granito San Martin de edad permica en el Macizo Nordpatagonico. El greisen esta constituido por muscovita-cuarzo y cantidades menores de apatita, turmalina y escasos cristales de topacio y circon. Se manifiesta en forma penetrativa relacionada al granito y en las salbandas de venas de cuarzo. El analisis quimico de una roca greisenizada muestra un aumento en el contenido de Si, P, Sn, Hf, Zr y tierras raras con respecto al de la roca granitica original. Los analisis quimicos realizados sobre la mica del greisen permitieron clasificarla como una muscovita 2M1. Los estudios de inclusiones fluidas revelan que los fluidos formadores del greisen presentan temperaturas de entrampamiento de 460oC y bajas salinidades (4% en peso equivalente a NaCl). Los valores isotopicos calculados de d18O entre 11 y 13 ‰ y de d D entre -32 y -34 ‰ sobre muscovita, sugieren que el greisen se formo...
Stretching in continental back-arc basins: Insights from subsidence analysis of the Neuquén Basin, Argentina
Tectonophysics, 2021
Abstract In the present contribution, we apply forward modelling and subsidence analysis to deter... more Abstract In the present contribution, we apply forward modelling and subsidence analysis to determine the initial lithospheric structure and the Neuquen Basin central area's stretching factor. The forward models determined that the initial thickness of the crust and the lithosphere would have been around 30 km and 100 km, respectively. Airy and regional isostasy models were considered for the calculation of the tectonic subsidence in outcrops and the subsurface. In both cases, results are very similar due to an elastic thickness of ~3 km for the beginning of the basin, which allows considering the Airy isostasy model as the representative for the analyzed period in the study area. Regarding the stretching factor, the results suggest that the extension varies between 1 and 1.32 for the analyzed area. Although these values seem to be higher than the previous estimations for the Neuquen Basin, they are consistent with those mentioned in the literature for the back-arc basins around the world with similar lithosphere structure and tectonic subsidence values. Furthermore, it should be mentioned that similar tectonic subsidence values could be obtained for the same area considering a lower stretching factor and a westward lithospheric thickening associated with the Neopaleozoic orogeny.
The Marifil Volcanic Complex at Sierra de Pailemán: implications for the Early Jurassic magmatic evolution of the Eastern North Patagonian Region
International Geology Review, 2021
ABSTRACT The Sinemurian Marifil Volcanic Complex at Sierra de Pailemán, located in the east part ... more ABSTRACT The Sinemurian Marifil Volcanic Complex at Sierra de Pailemán, located in the east part of the North Patagonian Region, Argentina, includes five lithofacies and three volcanic events. The volcanic activity begins with subaerial pyroclastic-fall deposits, massive lapilli tuffs with eutaxitic textures, and subaerial silicic domes’ emplacement. The upper part of the sequence is formed by pyroclastic fall deposits that pass to massive lapilli tuffs and rhyolitic lava flows. These lithofacies indicate the collapse of explosive eruption columns, coeval with small silicic domes’ emplacement, and lava-flows’ eruption. The volcanic episode at Sierra de Pailemán was generated during continuous magmatic activity because no erosional or unconformity surfaces were recognized. The Marifil Volcanic Complex’s age at Sierra de Pailemán is 191.2 ± 1.3 Ma (Sinemurian) and belongs to the V0 phase of volcanism. These rocks are high-K rhyolites, possibly produced by partial melting of the lower crust, promoted by fluids derived from a subducted plate in back-arc settings that change to an intraplate setting. The Lu-Hf isotopes suggest the possibility of magma mixing in the source and recycling or re-melting of a more evolved crust related to subduction zones. The Lower Jurassic magmatic activity in the western North Patagonian Region and the Patagonian Cordillera of Argentina and Chile correspond to continental arcs. Graphical abstract
Lithos, 2020
This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
International Geology Review, 2019
The northern zone of the Chon Aike Igneous Province, located in the North Patagonian Massif, exhi... more The northern zone of the Chon Aike Igneous Province, located in the North Patagonian Massif, exhibits extensive outcrops of Jurassic volcanic rocks of the Marifil Formation. In the Arroyo Verde area, the initial volcanic stage of the Marifil Formation, that we denominate V0 (192.6 ± 2.5 Ma), includes coulées, megabreccias and lapilli tuffs assigned to plinian-type volcanism. This magmatism was generated by cold-wet-oxidized magmas that resemble those produced in active continental margins and volcanic arcs. The second stage, located unconformably over the first, includes welded lava-like ignimbrites, massive lapilli tuff and rhyolitic lava flow that resemble the Snake River-type volcanism. The magma that produces this volcanic stage exhibit the characteristics of hot-dry-reduced magmas emplaced in intraplate continental environments associated with continental rifting. This stage coincides with the V1 volcanic episode early recorded in the Marifil Formation.
Geoscience Frontiers, 2017
The metasedimentary sequence of the Cushamen Formation in the western North Patagonian Massif is ... more The metasedimentary sequence of the Cushamen Formation in the western North Patagonian Massif is 540 m thick and comprises six sedimentary lithofacies associations related to a glacimarine environment. Four of these lithofacies represent distal glacimarine environments, whereas another one was deposited in proximal glacimarine environments, and the last includes subglacial environments. The organization and configuration of these lithofacies associations represent the advance and retreat of the glacier masses. The maximum glacial advance is correlatable with the G2 glacial interval of the Pennsylvanian Pampa de Tepuel, Las Salinas and Valley Chico, formations of the Extraandean Chubut, and the southern part of Neuquén Cordillera. Contemporaneously, in southern Chile there are marine and glacimarine sediments. The chronostratigraphic relationships between the Silurian to Permian units allow five paleogeographic stages to be distinguished. The middle Silurianelate Devonian igneous rocks represent the first magmatic stage. The second stage, which is transitional to the first, is represented by a marine basin that includes the late Devonianeearly Carboniferous Esquel and Río Pescado formations and the Llanquihue Complex. The third stage (earlyelate Carboniferous) includes granitoids of the second magmatic event that partially overlapped the first magmatic igneous belt. The fourth stage belongs to the late Carboniferous sedimentation of the Cushamen and equivalent formations. The extended early Permian magmatism was the last Paleozoic event in the studied area.
Geomorphological and anthropic impacts over land surface displacements: application of DInSAR technique to the case of Bahía Blanca city, Argentina
Geocarto International, 2021
Journal of South American Earth Sciences, 2020
This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
Relaciones de texturas macroscópicas con el contenido de Au-Ag en sondajes del Proyecto Arroyo Verde, Macizo Nordpatagónico
Geoscience Frontiers
The metasedimentary sequence of the Cushamen Formation in the western North Patagonian Massif is ... more The metasedimentary sequence of the Cushamen Formation in the western North Patagonian Massif is 540 m thick and comprises six sedimentary lithofacies associations related to a glacimarine environment. Four of these lithofacies represent distal glacimarine environments, whereas another one was deposited in proximal glacimarine environments, and the last includes subglacial environments. The organization and configuration of these lithofacies associations represent the advance and retreat of the glacier masses. The maximum glacial advance is correlatable with the G2 glacial interval of the Pennsylvanian Pampa de Tepuel, Las Salinas and Valley Chico, formations of the Extraandean Chubut, and the southern part of Neuquén Cordillera. Contemporaneously, in southern Chile there are marine and glacimarine sediments. The chronostratigraphic relationships between the Silurian to Permian units allow five paleogeographic stages to be distinguished. The middle Silurianelate Devonian igneous rocks represent the first magmatic stage. The second stage, which is transitional to the first, is represented by a marine basin that includes the late Devonianeearly Carboniferous Esquel and Río Pescado formations and the Llanquihue Complex. The third stage (earlyelate Carboniferous) includes granitoids of the second magmatic event that partially overlapped the first magmatic igneous belt. The fourth stage belongs to the late Carboniferous sedimentation of the Cushamen and equivalent formations. The extended early Permian magmatism was the last Paleozoic event in the studied area.
Evolution of the Jurassic Comallo volcanic sedimentary complex in the western North Patagonian Massif, Rio Negro province, Argentina
International Geology Review
The Puesto Piris Formation: Evidence of basin-development in the North Patagonian Massif during crustal extension associated with Gondwana breakup
Geoscience Frontiers
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Papers by Cecilia Pavon Pivetta