Diego Guido - Academia.edu (original) (raw)

Papers by Diego Guido

Research paper thumbnail of Age and petrography and geochemistry features of subvolcanic outcrops from Cerro León Formation, east of the Deseado Massif, Santa Cruz

Revista de la …, 2004

RESUMEN. Se presentan nuevos afloramientos de cuerpos subvolcánicos correlacionables con la Forma... more RESUMEN. Se presentan nuevos afloramientos de cuerpos subvolcánicos correlacionables con la Formación Cerro León en el sector oriental del Macizo del Deseado. Esta unidad aflora en dos sectores, en el bajo Leonardo y en el afloramiento Bahía Laura del Complejo Río ...

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Research paper thumbnail of Detección de indio a partir de espectrometría Raman en esfaleritas del depósito epitermal polimetálico Pingüino, Macizo del Deseado, Patagonia

Revista de la Asociación Geológica Argentina, Jun 30, 2019

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Research paper thumbnail of Intrusive bodies associated with the polymetallic mineralization of the Cerro León deposit, area of Cerro Tranquilo anticline, Santa Cruz: Geophysical evidence

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Research paper thumbnail of A new middle-late Jurassic compression flora associated with the San Agustín hot-spring deposit, southern Patagonia, Argentina

ABSTRACT We describe a new Middle-Late Jurassic flora from the La Matilde Formation (Bahia Laura ... more ABSTRACT We describe a new Middle-Late Jurassic flora from the La Matilde Formation (Bahia Laura Group) associated with the San Agustín hot-spring deposit, western Deseado Massif, Southern Patagonia, Argentina. The 7 genera and 14 morphospecies, preserved as impressions, record a relatively diverse woodland plant community dominated by conifers and bennettitaleans growing adjacent to herbaceous lake margin communities.

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Research paper thumbnail of E Quisetum Thermale Sp. Nov. (Equisetales) from the Jurassic San Agust N Hot Spring Deposit, Patag

American Journal of Botany, 2011

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Research paper thumbnail of Filamentous cyanobacteria and associated microorganisms, structurally preserved in a Late Jurassic chert from Patagonia, Argentina

Journal of South American Earth Sciences, Apr 1, 2021

Abstract A new cyanobacterium, Patagonifilum jurassicum nov. gen. et sp., is structurally preserv... more Abstract A new cyanobacterium, Patagonifilum jurassicum nov. gen. et sp., is structurally preserved in Late Jurassic hydrothermally influenced siliceous chert from the Deseado Massif, Patagonia, Argentina. The cyanobacterium occurs in the form of loosely to densely spaced, heteropolar filaments (up to 4.5 μm wide) that form turf-like stands, or spherical to hemispherical colonies on different substrates, usually degraded plant stems. Filaments consist of barrel-shaped cells enveloped in a non-stratified sheath, and basal cells that are distinct. The fossil is similar to certain present-day members of the Oscillatoriales (e.g., Homoeothrix), Synechococcales (e.g., Tapinothrix), and Nostocales (e.g., Rivularia, Gloeotrichia). Associated with the cyanobacteria are spheroidal to ovoid vesicles, up to 45 μm in diameter, which occur singly or clustered, mostly near the base of the filaments. They resemble certain present-day zoosporic fungi, and algae, coccoid cyanobacteria, and possibly certain arthropod eggs; however, their systematic affinities remain unresolved. This discovery is nevertheless important because it suggests that the cyanobacterial overgrowths from the Patagonian Jurassic cherts were not monospecific, but rather comprised different organisms that perhaps even interacted with each other.

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Research paper thumbnail of Edad y rasgos petrográficos y geoquímicos de cuerpos subvolcánicos asignables a la Formación Cerro León, este del Macizo del Deseado, Santa Cruz

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Research paper thumbnail of Middle-Late Jurassic megaflora of Laguna Flecha Negra locality in Santa Cruz Province, Patagonia, and floristic assemblages of the Bahía Laura Complex

Journal of South American Earth Sciences, Jun 1, 2020

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Research paper thumbnail of Conifer Root Nodules Colonized by Arbuscular Mycorrhizal Fungi in Jurassic Geothermal Settings from Patagonia, Argentina

International Journal of Plant Sciences, Feb 1, 2020

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Research paper thumbnail of Multitrophic interactions in a geothermal setting: Arthropod borings, actinomycetes, fungi and fungal-like microorganisms in a decomposing conifer wood from the Jurassic of Patagonia

Palaeogeography, Palaeoclimatology, Palaeoecology, 2019

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Research paper thumbnail of La Marciana Jurassic sinter—implications for exploration for epithermal precious-metal deposits in Deseado Massif, southern Patagonia, Argentina

Transactions, Aug 1, 2002

Abstract A well-preserved Jurassic siliceous sinter has been identified at La Marciana farm in so... more Abstract A well-preserved Jurassic siliceous sinter has been identified at La Marciana farm in southern Patagonia, Argentina. Fossil sinters are a rare occurrence and this example bridges the gap between Devonian/Carboniferous examples and more abundant Tertiary sinters. Its presence is significant in the context of exploration for epithermal precious-metal deposits in the Deseado Massif geological province of southern Patagonia. Field and textural characteristics of the La Marciana siliceous deposit provide unequivocal evidence of its origin. It is located in an appropriate volcanic and epithermal environment and it displays a strongly developed non-planar depositional lamination, elongate cavities parallel to this lamination, small-scale stromatolitic columnar structures, moulds of stems and roots of plants and desiccation cracks. Geochemical and oxygen isotope studies provide additional information compatible with a sinter origin. The content of precious-metal elements—apart from in anomalous hydrothermal breccia—is low, and the average Au, Ag, As and Sb concentrations are similar to those of most known fossil sinters. The 18O SMOW values obtained on La Marciana sinter range from 7.3 to 16‰ and could indicate a lower temperature of formation when compared with quartz-vein isotope data from the Cerro Vanguardia area—the best-known example of an epithermal precious-metal deposit in the Deseado Massif. Hydrothermal alteration of the volcanic rocks and the presence of quartz veinlets and hydrothermal breccias with Au and Ag anomalies in the La Marciana area are indicative of gold- and silver-rich hydrothermal activity. Taken in conjunction with the presence of the La Marciana sinter, which is further evidence of Jurassic hot-spring deposits in the western border of the Deseado Massif, this suggests that exploration in the area should focus on locating epithermal quartz vein systems that may be preserved at depth.

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Research paper thumbnail of Geomolecules in the Late Jurassic Claudia paleo-geothermal field: evidence of a complex geological and biological environment

Goldschmidt2022 abstracts, 2022

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Research paper thumbnail of Modelado Geológico y Geoquímico Tridimensional De La Veta Marta Norte, Depósito Pingüino, Macizo Del Deseado

Revista de la Asociación Geológica Argentina, Jul 25, 2020

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Research paper thumbnail of Tracing Hot-Spring Facies and thier Geothermally Silicified Microbial Textures into the Geologic Record: Relevance for Mars Biosignature Recognition

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Research paper thumbnail of Linkages between the southern Patagonia Pre-Permian basements: new insights from detrital zircons U

Geologica Acta, 2014

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Research paper thumbnail of A new metallogenical association (Sn-Cd-In-Zn-Ag-Au) in the Deseado auroargentiferous province, Deseado Massif, Patagonia, Argentina

Springer eBooks, 2005

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Research paper thumbnail of Exceptional molecular preservation in the Late Jurassic Claudia palaeo-geothermal field (Deseado Massif, Patagonia, Argentina)

Organic Geochemistry

Gas chromatography-mass spectrometry was applied to samples collected from an exceptionally well-... more Gas chromatography-mass spectrometry was applied to samples collected from an exceptionally well-preserved Late Jurassic (~150 Ma) sinter complex of the Claudia palaeo-geothermal field, Deseado Massif geological province, Argentinean Patagonia, which, despite its age, has never been deeply buried. Results indicate that the distal sinter apron has a much higher preservation potential for indigenous organic matter (OM) than the more proximal (vent area) facies of this palaeo-geothermal field. Specifically, homohopane ratios show that the OM of the proximal apron is of mixed thermal maturities and is in low abundance. In contrast, the OM extracted from the distal apron contains highly abundant, thermally immature biomarkers, the presence of which are consistent with the lower original fluid temperatures of the distal spring facies. Moreover, despite indications of the presence of some thermally mature aromatic compounds, hopane and sterane ratios confirm that the distal apron samples are extremely thermally immature and thereby constitute an area of exceptional molecular preservation. From an astrobiological viewpoint, these results suggest that silica sinter can preserve abundant organics over millions of years in palaeoenvironmentally conducive settings, and that sample-site selection within a hot spring facies-model framework may be critical in the successful search for ancient extra-terrestrial life.

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Research paper thumbnail of Detection and Preservation of Biosignatures in Mars Analogs Hot Spring Deposits from the Taupo Volcanic Zone, New Zealand

EPSC-DPS Joint Meeting 2019, Sep 1, 2019

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Research paper thumbnail of The Cerro Negro epithermal district, northwestern Deseado Massif (Patagonia, Argentina): New insights from telescoped volcanic-hydrothermal systems

Journal of South American Earth Sciences, 2021

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Research paper thumbnail of Intrusive hyaloclastite and peperitic breccias associated to sill and cryptodome emplacement on an Early Paleocene polymagmatic compound cone-dome volcanic complex from El Guanaco mine, Northern Chile

Journal of Volcanology and Geothermal Research, 2018

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Research paper thumbnail of Age and petrography and geochemistry features of subvolcanic outcrops from Cerro León Formation, east of the Deseado Massif, Santa Cruz

Revista de la …, 2004

RESUMEN. Se presentan nuevos afloramientos de cuerpos subvolcánicos correlacionables con la Forma... more RESUMEN. Se presentan nuevos afloramientos de cuerpos subvolcánicos correlacionables con la Formación Cerro León en el sector oriental del Macizo del Deseado. Esta unidad aflora en dos sectores, en el bajo Leonardo y en el afloramiento Bahía Laura del Complejo Río ...

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Research paper thumbnail of Detección de indio a partir de espectrometría Raman en esfaleritas del depósito epitermal polimetálico Pingüino, Macizo del Deseado, Patagonia

Revista de la Asociación Geológica Argentina, Jun 30, 2019

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Intrusive bodies associated with the polymetallic mineralization of the Cerro León deposit, area of Cerro Tranquilo anticline, Santa Cruz: Geophysical evidence

Bookmarks Related papers MentionsView impact

Research paper thumbnail of A new middle-late Jurassic compression flora associated with the San Agustín hot-spring deposit, southern Patagonia, Argentina

ABSTRACT We describe a new Middle-Late Jurassic flora from the La Matilde Formation (Bahia Laura ... more ABSTRACT We describe a new Middle-Late Jurassic flora from the La Matilde Formation (Bahia Laura Group) associated with the San Agustín hot-spring deposit, western Deseado Massif, Southern Patagonia, Argentina. The 7 genera and 14 morphospecies, preserved as impressions, record a relatively diverse woodland plant community dominated by conifers and bennettitaleans growing adjacent to herbaceous lake margin communities.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of E Quisetum Thermale Sp. Nov. (Equisetales) from the Jurassic San Agust N Hot Spring Deposit, Patag

American Journal of Botany, 2011

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Filamentous cyanobacteria and associated microorganisms, structurally preserved in a Late Jurassic chert from Patagonia, Argentina

Journal of South American Earth Sciences, Apr 1, 2021

Abstract A new cyanobacterium, Patagonifilum jurassicum nov. gen. et sp., is structurally preserv... more Abstract A new cyanobacterium, Patagonifilum jurassicum nov. gen. et sp., is structurally preserved in Late Jurassic hydrothermally influenced siliceous chert from the Deseado Massif, Patagonia, Argentina. The cyanobacterium occurs in the form of loosely to densely spaced, heteropolar filaments (up to 4.5 μm wide) that form turf-like stands, or spherical to hemispherical colonies on different substrates, usually degraded plant stems. Filaments consist of barrel-shaped cells enveloped in a non-stratified sheath, and basal cells that are distinct. The fossil is similar to certain present-day members of the Oscillatoriales (e.g., Homoeothrix), Synechococcales (e.g., Tapinothrix), and Nostocales (e.g., Rivularia, Gloeotrichia). Associated with the cyanobacteria are spheroidal to ovoid vesicles, up to 45 μm in diameter, which occur singly or clustered, mostly near the base of the filaments. They resemble certain present-day zoosporic fungi, and algae, coccoid cyanobacteria, and possibly certain arthropod eggs; however, their systematic affinities remain unresolved. This discovery is nevertheless important because it suggests that the cyanobacterial overgrowths from the Patagonian Jurassic cherts were not monospecific, but rather comprised different organisms that perhaps even interacted with each other.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Edad y rasgos petrográficos y geoquímicos de cuerpos subvolcánicos asignables a la Formación Cerro León, este del Macizo del Deseado, Santa Cruz

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Middle-Late Jurassic megaflora of Laguna Flecha Negra locality in Santa Cruz Province, Patagonia, and floristic assemblages of the Bahía Laura Complex

Journal of South American Earth Sciences, Jun 1, 2020

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Conifer Root Nodules Colonized by Arbuscular Mycorrhizal Fungi in Jurassic Geothermal Settings from Patagonia, Argentina

International Journal of Plant Sciences, Feb 1, 2020

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Multitrophic interactions in a geothermal setting: Arthropod borings, actinomycetes, fungi and fungal-like microorganisms in a decomposing conifer wood from the Jurassic of Patagonia

Palaeogeography, Palaeoclimatology, Palaeoecology, 2019

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Research paper thumbnail of La Marciana Jurassic sinter—implications for exploration for epithermal precious-metal deposits in Deseado Massif, southern Patagonia, Argentina

Transactions, Aug 1, 2002

Abstract A well-preserved Jurassic siliceous sinter has been identified at La Marciana farm in so... more Abstract A well-preserved Jurassic siliceous sinter has been identified at La Marciana farm in southern Patagonia, Argentina. Fossil sinters are a rare occurrence and this example bridges the gap between Devonian/Carboniferous examples and more abundant Tertiary sinters. Its presence is significant in the context of exploration for epithermal precious-metal deposits in the Deseado Massif geological province of southern Patagonia. Field and textural characteristics of the La Marciana siliceous deposit provide unequivocal evidence of its origin. It is located in an appropriate volcanic and epithermal environment and it displays a strongly developed non-planar depositional lamination, elongate cavities parallel to this lamination, small-scale stromatolitic columnar structures, moulds of stems and roots of plants and desiccation cracks. Geochemical and oxygen isotope studies provide additional information compatible with a sinter origin. The content of precious-metal elements—apart from in anomalous hydrothermal breccia—is low, and the average Au, Ag, As and Sb concentrations are similar to those of most known fossil sinters. The 18O SMOW values obtained on La Marciana sinter range from 7.3 to 16‰ and could indicate a lower temperature of formation when compared with quartz-vein isotope data from the Cerro Vanguardia area—the best-known example of an epithermal precious-metal deposit in the Deseado Massif. Hydrothermal alteration of the volcanic rocks and the presence of quartz veinlets and hydrothermal breccias with Au and Ag anomalies in the La Marciana area are indicative of gold- and silver-rich hydrothermal activity. Taken in conjunction with the presence of the La Marciana sinter, which is further evidence of Jurassic hot-spring deposits in the western border of the Deseado Massif, this suggests that exploration in the area should focus on locating epithermal quartz vein systems that may be preserved at depth.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Geomolecules in the Late Jurassic Claudia paleo-geothermal field: evidence of a complex geological and biological environment

Goldschmidt2022 abstracts, 2022

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Modelado Geológico y Geoquímico Tridimensional De La Veta Marta Norte, Depósito Pingüino, Macizo Del Deseado

Revista de la Asociación Geológica Argentina, Jul 25, 2020

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Tracing Hot-Spring Facies and thier Geothermally Silicified Microbial Textures into the Geologic Record: Relevance for Mars Biosignature Recognition

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Linkages between the southern Patagonia Pre-Permian basements: new insights from detrital zircons U

Geologica Acta, 2014

Bookmarks Related papers MentionsView impact

Research paper thumbnail of A new metallogenical association (Sn-Cd-In-Zn-Ag-Au) in the Deseado auroargentiferous province, Deseado Massif, Patagonia, Argentina

Springer eBooks, 2005

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Exceptional molecular preservation in the Late Jurassic Claudia palaeo-geothermal field (Deseado Massif, Patagonia, Argentina)

Organic Geochemistry

Gas chromatography-mass spectrometry was applied to samples collected from an exceptionally well-... more Gas chromatography-mass spectrometry was applied to samples collected from an exceptionally well-preserved Late Jurassic (~150 Ma) sinter complex of the Claudia palaeo-geothermal field, Deseado Massif geological province, Argentinean Patagonia, which, despite its age, has never been deeply buried. Results indicate that the distal sinter apron has a much higher preservation potential for indigenous organic matter (OM) than the more proximal (vent area) facies of this palaeo-geothermal field. Specifically, homohopane ratios show that the OM of the proximal apron is of mixed thermal maturities and is in low abundance. In contrast, the OM extracted from the distal apron contains highly abundant, thermally immature biomarkers, the presence of which are consistent with the lower original fluid temperatures of the distal spring facies. Moreover, despite indications of the presence of some thermally mature aromatic compounds, hopane and sterane ratios confirm that the distal apron samples are extremely thermally immature and thereby constitute an area of exceptional molecular preservation. From an astrobiological viewpoint, these results suggest that silica sinter can preserve abundant organics over millions of years in palaeoenvironmentally conducive settings, and that sample-site selection within a hot spring facies-model framework may be critical in the successful search for ancient extra-terrestrial life.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Detection and Preservation of Biosignatures in Mars Analogs Hot Spring Deposits from the Taupo Volcanic Zone, New Zealand

EPSC-DPS Joint Meeting 2019, Sep 1, 2019

Bookmarks Related papers MentionsView impact

Research paper thumbnail of The Cerro Negro epithermal district, northwestern Deseado Massif (Patagonia, Argentina): New insights from telescoped volcanic-hydrothermal systems

Journal of South American Earth Sciences, 2021

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Intrusive hyaloclastite and peperitic breccias associated to sill and cryptodome emplacement on an Early Paleocene polymagmatic compound cone-dome volcanic complex from El Guanaco mine, Northern Chile

Journal of Volcanology and Geothermal Research, 2018

Bookmarks Related papers MentionsView impact