Article
Paleontology
Kristal Rueda, Guillermo L. Albanesi
Summary: In this study, the diversity of Floian conodonts from the Precordillera and Cordillera Oriental regions in Argentina were compared. The results showed remarkable differences in species richness and diversity between the two regions, which may be attributed to the complex interaction of biological and physico-chemical factors.
MARINE MICROPALEONTOLOGY
(2023)
Article
Geography, Physical
Daniela S. Monti, Viviana A. Confalonieri, M. Franco Tortello
Summary: This study investigates the biogeographic histories of two cosmopolitan groups of Olenida, Hypermecaspididae and Parabolinella (Olenidae). Different biogeographical models were compared, and the results suggest that jump dispersal was an important speciation strategy for both groups. Vicariance was found to be unimportant. The dispersal patterns of Parabolinella were influenced by ocean currents, while those of Hypermecaspididae were not. Island hopping and creeping were the main dispersal mechanisms for both groups. The western margin of Gondwana played a significant role as a dispersal center during the Furongian and Early Ordovician.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2023)
Article
Paleontology
Guillermo L. Albanesi, C. Ruben Monaldi, Christopher R. Barnes, Fernando J. Zeballo, Gladys Ortega
Summary: This study analyzes a large collection of conodonts from the Santa Gertrudis Formation in NW Argentina. Due to the mostly endemic fauna of this unit and the lack of index species, complex taxonomic and biostratigraphic interpretations are required. New species apparatuses were determined using a different taxonomic approach. Although intercontinental correlation is limited, the overlapping ranges of recorded species suggest a middle Darriwilian age for the formation.
MARINE MICROPALEONTOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Fernando J. Lavie, Juan L. Benedetto
Summary: This article describes a Lower Tremadocian lingulate assemblage from the Guayoc Chico Group for the first time. The fauna includes poorly preserved obolids, the acrotretid Eurytreta harringtoni, and the siphonotretid Celdobolus skrikus sp. nov. The Tremadocian lingulate fauna from the Central Andean basin has the closest biogeographical similarity with the Bohemian and Avalonian assemblages. The dispersal trajectory is believed to be towards the poleward direction along the clastic platforms bordering the Amazonian and NW Africa cratons, possibly transported by the Antarctica Current.
BULLETIN OF GEOSCIENCES
(2023)
Article
Geosciences, Multidisciplinary
M. J. Mango, G. L. Albanesi
Summary: We studied the conodont fauna and biostratigraphy of the lower 3 m of the Gualcamayo Formation in Argentina. Through the identification of 828 conodonts, we reassigned the lower part of the formation to the Baltoniodus navis Zone. Our findings also revealed correlations with other regions such as China, Sweden, and North America.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2023)
Article
Geology
Fernando E. Lopez, Gladys Ortega, Guillermo L. Albanesi, Aldo L. Banchig
Summary: Upper Ordovician graptolites and conodonts from the Yerba Loca Formation in Argentina provide important regional and global correlations, particularly in poorly known deep marine environments. The fossils collected include late Sandbian Climacograptus bicornis Zone graptolites and Amorphognathus tvaerensis Zone conodonts. The presence of early Sandbian Nemagraptus gracilis Zone graptolites is also reported, expanding the understanding of this geological time period.
ESTONIAN JOURNAL OF EARTH SCIENCES
(2023)
Article
Geosciences, Multidisciplinary
J. Carlorosi, S. Heredia, G. Acenolaza
Summary: This study analyzed the conodont fauna of the Famatina System in NW Argentina, revealing a significant conodont association that supports a Dapingian age for the fossil-bearing strata. It also suggests a paleobiogeographic migration pattern between the Andean Basin, the Famatina System, and the Precordillera during the latest Early Ordovician and early Middle Ordovician.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2023)
Article
Paleontology
Fernando J. Lavie, Ana I. Mestre, Marcelo G. Carrera
Summary: New linguliform microbrachiopods from the Middle Ordovician were described and illustrated in this study, recovered from the uppermost beds of the San Juan Formation in Argentina. This low-diversity lingulate association displayed close similarities with coeval faunas in other regions.
JOURNAL OF PALEONTOLOGY
(2021)
Article
Paleontology
Josefina M. T. Carlorosi, Ana Mestre, Susana E. Heredia
Summary: A new genus of conodonts called Condorodus is identified in several Argentinian basins during the Ordovician period. Three species within this genus are recognized based on differences in P elements. The Eastern Cordillera is considered the place of origin of the Condorodus genus, which later dispersed through the western margin of Gondwana and reached the Precordillera.
COMPTES RENDUS PALEVOL
(2022)
Article
Geosciences, Multidisciplinary
Mariano A. Larrovere, Cesar Casquet, R. Hernan Aciar, Edgardo G. Baldo, Pablo H. Alasino, Carlos W. Rapela
Summary: New SHRIMP U-Pb zircon and monazite ages from Sierra de Fiambal ' a in NW Argentina reveal coeval granitoid peraluminous magmatism and high-grade metamorphism around 525 Ma related to the Pampean orogeny. The region may have been thrusted westward during the Famatinian orogeny or rifted away from the main Pampean orogenic belt before being reworked by the latter, extending the Pampean orogen far westward of its recognized extent.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2021)
Article
Geosciences, Multidisciplinary
Clara Cisterna, Beatriz Coira, Uwe Altenberger, Susana Esteban, Antonio Gutierrez, Christina Guenter, Fernando Sardi
Summary: By analyzing the metamorphic sedimentary rocks from Sierra de Narv ' aez in the Famatinian Orogen, it is possible to evaluate the depositional environment, provenance, and tectonic setting. The metasandstone in Sierra de Narv ' aez, consisting of quartz, feldspar, and volcanic fragments, shows similarities to rocks influenced by a magmatic arc. The presence of volcanic components and deep-sea turbidite characteristics suggest a continental arc setting. These deposits mark the beginning of volcanic activity in the Famatina System (s.l.) under a tectonic regime of a continental island arc.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2023)
Article
Geosciences, Multidisciplinary
Nicolas A. Feltes, Fernanda Serra, Gladys Ortega, Guillermo L. Albanesi
GEOLOGICAL JOURNAL
(2019)
Article
Geosciences, Multidisciplinary
Matias J. Mango, Gladys Ortega, Guillermo L. Albanesi
GEOLOGICAL JOURNAL
(2019)
Article
Geography, Physical
Guillermo L. Albanesi, Christopher R. Barnes, Julie A. Trotter, Ian S. Williams, Stig M. Bergstrom
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2020)
Article
Geosciences, Multidisciplinary
Gabriela Torre, Guillermo L. Albanesi
GEOLOGICAL MAGAZINE
(2020)
Article
Geology
Fernanda Serra, Nicolas A. Feltes, Matias Mango, Miles A. Henderson, Guillermo L. Albanesi, Gladys Ortega
Article
Geology
Matias J. Mango, Guillermo L. Albanesi
Article
Paleontology
Guillermo L. Albanesi, E. Kristal Rueda, Gladys Ortega, Cesar R. Monaldi
Article
Geosciences, Multidisciplinary
M. J. Mango, G. G. Voldman, G. L. Albanesi
Summary: The study in the Ullum Volcanic Center of the Argentine Precordillera focuses on the biostratigraphy, geothermometry, and preservation of conodont elements recovered from the San Juan Formation. The biostratigraphic analysis confirms the deposits in the area correspond to the Floian Stage (Lower Ordovician), and reveals strong correlations with other regions such as Baltoscandia, Newfoundland, China, and the North America Midcontinent biostratigraphic schemes. The preservation of the conodont elements is related to the distance from volcanic rocks and the hydrothermal-metasomatic processes in the area.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2021)
Article
Geosciences, Multidisciplinary
M. J. Mango, G. L. Albanesi
Summary: This study uses first and last occurrences of conodont species and petrographic thin sections to identify systems tracts in the San Juan Formation, recognizing two transgressive systems tracts (TST) and two highstand systems tracts (HST). The analysis also includes the location of maximum flooding surfaces corresponding to each depositional sequence.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2021)
Article
Geosciences, Multidisciplinary
M. J. Mango, G. L. Albanesi
Summary: We studied the conodont fauna and biostratigraphy of the lower 3 m of the Gualcamayo Formation in Argentina. Through the identification of 828 conodonts, we reassigned the lower part of the formation to the Baltoniodus navis Zone. Our findings also revealed correlations with other regions such as China, Sweden, and North America.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2023)
Article
Paleontology
Guillermo L. Albanesi, C. Ruben Monaldi, Christopher R. Barnes, Fernando J. Zeballo, Gladys Ortega
Summary: This study analyzes a large collection of conodonts from the Santa Gertrudis Formation in NW Argentina. Due to the mostly endemic fauna of this unit and the lack of index species, complex taxonomic and biostratigraphic interpretations are required. New species apparatuses were determined using a different taxonomic approach. Although intercontinental correlation is limited, the overlapping ranges of recorded species suggest a middle Darriwilian age for the formation.
MARINE MICROPALEONTOLOGY
(2023)
Article
Paleontology
Kristal Rueda, Guillermo L. Albanesi
Summary: In this study, the diversity of Floian conodonts from the Precordillera and Cordillera Oriental regions in Argentina were compared. The results showed remarkable differences in species richness and diversity between the two regions, which may be attributed to the complex interaction of biological and physico-chemical factors.
MARINE MICROPALEONTOLOGY
(2023)
Article
Geology
Gisella M. Della Costa, Guillermo L. Albanesi
Summary: The study aims to evaluate the similarity in conodont species composition between different regions during the Early Ordovician Evae transgression. Cluster analysis indicates the presence of two moderately to poorly differentiated faunal groups, suggesting that certain paleogeographic barriers may have remained during the transgression. There seems to be a paleolatitudinal control over species distribution, with a higher number of species dwelling in mid-low latitudes than mid-latitudes. This suggests a potentially smaller magnitude or duration for the Evae transgression.
ESTONIAN JOURNAL OF EARTH SCIENCES
(2023)
Article
Geology
Fernando E. Lopez, Gladys Ortega, Guillermo L. Albanesi, Aldo L. Banchig
Summary: Upper Ordovician graptolites and conodonts from the Yerba Loca Formation in Argentina provide important regional and global correlations, particularly in poorly known deep marine environments. The fossils collected include late Sandbian Climacograptus bicornis Zone graptolites and Amorphognathus tvaerensis Zone conodonts. The presence of early Sandbian Nemagraptus gracilis Zone graptolites is also reported, expanding the understanding of this geological time period.
ESTONIAN JOURNAL OF EARTH SCIENCES
(2023)
Article
Paleontology
Matias J. Mango, Guillermo L. Albanesi
Summary: Conodonts from the upper La Silla and San Juan formations at the Cerro La Silla section were analyzed to identify faunal dynamics, biofacies, and sea-level changes. The study revealed seven distinct biofacies and two transgressive events in the San Juan Formation at the Cerro La Silla section.
COMPTES RENDUS PALEVOL
(2021)