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
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
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
Geochemistry & Geophysics
Kang Liu, Maosheng Jiang, Taiyu Huang, Liyu Zhang, Yuanzheng Wang, Daizhao Chen
Summary: This study presents multi-continental conodont apatite-based Sr-isotope datasets from three well-studied Ordovician carbonate successions in China, and finds a significant drop in marine Sr-87/Sr-86 ratios, which is almost synchronous with the Middle-Late Ordovician carbon isotope excursion. Numerical modeling suggests that this drop could have been caused by an increase in oceanic hydrothermal flux and/or a decrease in continental flux. The study indicates that enhanced oceanic hydrothermal activity associated with the opening of the Rheic and Paleo-Tethys oceans played a central role in this isotopic event.
Article
Paleontology
Yong Yi Zhen, Robert S. Nicoll, Leon S. Normore, Ian G. Percival, John R. Laurie, Louisa M. Dent
Summary: The conodont fauna of the carbonate-dominated Willara Formation in the Canning Basin of Western Australia includes 41 species, with a new species, Erraticodon neopatu Zhen n. sp. The Jumudontus gananda and Histiodella altifrons biozones are key for stratigraphic correlation. The formation primarily deposited in shallow nearshore settings with age-diagnostic species facilitating biostratigraphic analysis.
Article
Geosciences, Multidisciplinary
Tonn Paiste, Peep Mannik, Tonu Meidla
Summary: Conodonts are essential biostratigraphic tools used in the study of different Phanerozoic stages, and together with graptolites, they determine the boundaries of all the global Ordovician stages. A new conodont species, A. viirae sp. nov., has been identified in Estonian, Swedish, Polish, and US sections. The discovery of this new species, along with the absence of A. inaequalis (Rhodes), has led to the revision of the conodont zonation for the Sandbian Stage in the Atlantic Realm.
GEOLOGICAL MAGAZINE
(2023)
Article
Geology
A. P. Heward, R. A. Fortey, C. G. Miller, G. A. Booth
Summary: New trilobite material and the first graptolites from the Am5 member of the Amdeh Formation in Oman are described. The faunas are interpreted as distal-shelf deposits and are considered of late Darriwilian age. The trilobites and graptolites found in these deposits are of great paleobiogeographic interest, but the preservation prevents the establishment of new species.
PROCEEDINGS OF THE GEOLOGISTS ASSOCIATION
(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
Chemistry, Physical
Margarita Do Campo, Blanca Bauluz, Fernando Nieto
Summary: This study investigates the thermal post-depositional evolution of Ordovician slates and metavolcanic rocks in southern and northern Puna through X-ray diffraction and scanning electron microscopy. The results reveal that the rocks underwent prograde metamorphic evolution followed by hydrothermal alteration at different scales, confirming the widespread hydrothermal alteration in these areas.
APPLIED CLAY SCIENCE
(2022)
Article
Paleontology
Yong Yi Zhen, Heidi J. Allen, Sarah K. Martin
Summary: This study provides a systematic description of the conodonts from the Nambeet Formation in the Canning Basin, Western Australia. The discovery of a new species and several age-diagnostic taxa enables precise age constraints and correlation with other occurrences of the Samphire Marsh Member. The findings also suggest a significant thickness of the unit in the Barnicarndy 1 drillhole and correlation to other areas in the basin.
Article
Geosciences, Multidisciplinary
Wieslaw Trela, Ewa Krzeminska, Karol Jewula, Zbigniew Czupyt
Summary: This report presents oxygen isotopes from apatite of late Middle and Late Ordovician conodonts from the southern Holy Cross Mountains in Poland, providing new data on the O-18/O-16 budget in the Ordovician seawater and its relationship with climate changes.
Article
Paleontology
Fang-yi Gong, Rong-chang Wu, Yong-yi Zhen, Xiao-cong Luan, Ren-bin Zhan, Guan-zhou Yan
Summary: The study documents conodonts from the Darriwilian to early Katian in the typical Ordovician succession of the marginal Yangtze Platform in southern Anhui Province, East China. A total of 5228 conodont specimens, assigned to 20 genera and 29 species, were recovered from 56 carbonate samples, representing seven conodont biozones. The detailed conodont biostratigraphy reveals a hiatus between formations and increasing biodiversity trends within specific biozones.
Article
Geology
Yong Yi Zhen, Ian G. Percival
Summary: This paper reviews the newly revised biostratigraphy of Middle-Upper Ordovician marine shelf successions in central New South Wales, focusing on the Junee-Narromine Volcanic Belt. Seven conodont biozones were recognized in the Billabong Creek Formation, extending from the middle Darriwilian to the lower Katian. These findings provide crucial information for understanding the geological evolution of the region and correlating Ordovician rocks in the Macquarie Volcanic Province, which contains significant mineral deposits.
ESTONIAN JOURNAL OF EARTH SCIENCES
(2023)
Article
Paleontology
Guillermo Acenolaza, Susana Heredia, Josefina Carlorosi
COMPTES RENDUS PALEVOL
(2015)
Article
Geosciences, Multidisciplinary
Susana Heredia, Ana Mestre, Tatiana Soria, Cintia Kaufmann
GEOLOGICAL MAGAZINE
(2017)
Article
Geosciences, Multidisciplinary
Josefina Carlorosi, Graciela Sarmiento, Susana Heredia
GEOLOGICAL MAGAZINE
(2018)
Article
Geosciences, Multidisciplinary
Estefania Asurmendi, Maria Lidia Sanchez, Susana Heredia
GEOLOGICAL JOURNAL
(2020)
Article
Geography, Physical
Ana Mestre, Susana Heredia
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2020)
Article
Geology
Susana Heredia, Ana Mestre
Article
Biodiversity Conservation
Ana Mestre, Susana Heredia
PALAEOBIODIVERSITY AND PALAEOENVIRONMENTS
(2020)
Article
Geosciences, Multidisciplinary
Ana Mestre, Susana Heredia, Florencia Moreno, Leandro Benegas, Andres Morfil, Tatiana Soria
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2020)
Article
Geosciences, Multidisciplinary
Maria Jose Gomez, Ana Mestre, Carlo Corradini, Susana Heredia
Summary: The study on Silurian-Devonian conodonts from the Precordillera region of South America has made significant progress in the last 5 years. A new species of the genus Ozarkodina, named Ozarkodina huenickeni sp. nov., has been proposed based on new conodont collections, showing three different morpho-types possibly belonging to the bohemica lineage and representing a South American endemic taxon.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(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
Geology
Susana Heredia, Ana Mestre, Cintia Kaufmann, Tatiana Soria
Article
Geology
Josefina Carlorosi, Susana B. Esteban, M. Franco Tortello
Article
Geology
Tatiana Soria, Matilde Beresi, Ana Mestre, Susana Heredia, Maria Cecilia Rodriguez
BOLETIN GEOLOGICO Y MINERO
(2017)
Article
Geology
M. S. Beresi, O. L. Bordonaro, S. E. Heredia, A. Mestre, B. A. Toro
BOLETIN GEOLOGICO Y MINERO
(2017)
Article
Geosciences, Multidisciplinary
David Dominguez-Santos, Daniel Valderrama, Ahmet Utku Yazgan
Summary: This document presents a study comparing the spectra of large-magnitude seismic records in Chile between 2012 and 2022 with the design spectra of NCh433 and D. S 61. The aim is to determine if Chile's seismic-resistant regulations are updated to the existing reality and propose new design spectra that better represent the seismic activity in Chile during the last decade.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Prabhu Palanisamy, Vivek Sivakumar, Priya Velusamy, Logesh Natarajan
Summary: Shoreline changes in the southern coast of Rio de Janeiro, Brazil, were analyzed from 1986 to 2018. The study found that both natural and human factors significantly impact shoreline changes. The findings provided important insights into predicting future shoreline positions and identifying vulnerable regions. Additionally, human activities were found to influence shoreline change models, emphasizing the need for effective management strategies to protect ecosystems and communities.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Irina Salgado Bernal, Periyasamy Sivalingam, Armando Martinez Sardina, Michel Manduca Artiles, Maria E. Carballo Valdes, John Pote
Summary: This study investigated the presence of 15 toxic metals in surface sediment in a tropical river ecosystem in Cuba. The results showed that the sediments had higher concentrations of four metals compared to Cuban norms. Various contamination indices were calculated, and correlations analysis revealed the main sources of contamination. The study provides important information for the management of the river and emphasizes the need for metal pollution control and monitoring.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Camila Morgan, Eduardo Morgado, Miguel-Angel Parada, Raimundo Brahm, Francisca Mallea-Lillo
Summary: Lanin volcano is a composite volcano in the Andes, which has erupted lava flows with different compositions. The volcano's magma reservoir contains a crystal mush, and the pre-eruptive conditions include temperature, pressure, and oxygen fugacity. Fractional crystallisation has led to the evolution of the magma with different compositions.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Benjamin Idini, Sergio Ruiz, Jean-Paul Ampuero, Felipe Leyton, Efrain Rivera
Summary: This study investigates the role of wedge integrity on the frequency content of strong ground motion produced by subduction earthquakes in Northern Chile. The results show that the frequency characteristics of seismic waves vary with hypocentral distance, indicating lateral variations in anelastic attenuation due to the heterogeneous tectonic structure.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2024)
