A5037527229- Paleontology and Stratigraphy of Fossils
- Geological formations and processes
- Geochemistry and Elemental Analysis
- Fish biology, ecology, and behavior
- Paleontology and Evolutionary Biology
- Geology and Paleoclimatology Research
- Geological and Geochemical Analysis
- Geochemistry and Geologic Mapping
- Geological and Geophysical Studies
- Evolution and Paleontology Studies
- Astro and Planetary Science
- Hydrocarbon exploration and reservoir analysis
- Calcium Carbonate Crystallization and Inhibition
Universidade Federal de Ouro Preto
2017-2024
Universidade de São Paulo
2015-2019
Universidade Federal do Pará
2012-2017
The Ediacaran fossil Corumbella is important because it hypothesized to be a scyphozoan cnidarian, and thus might one of the rare examples bona fide Neoproterozoic animals. Unfortunately, its mode life, style skeletonization, taxonomic affinity have been very controversial. Here, we use X-ray micro-CT, SEM, taphonomic analysis compare preservational modes Corumbella, in order better understand symmetry, construction, style, taxonomy this group. Results suggest that articulated disarticulated...
Soft-tissue preservation provides palaeobiological information that is otherwise lost during fossilization. In Brazil, the Early Cretaceous Santana Formation contains fish with integument, muscles, connective tissues, and eyes are still preserved. Our study revealed soft-tissues were pyritized or kerogenized in different microfacies, which yielded distinct fidelities. Indeed, new data provided first record of vertebrate muscles eyes. We propose taphonomic pathways controlled by sedimentation...
At the Ediacaran/Cambrian boundary, ecosystems witnessed an unparalleled biological innovation: appearance of shelled animals. Here, we report new paleoecological and paleobiological data on Cloudina, which was one most abundant animals at end Ediacaran. We close association Cloudina tubes with microbial mat textures as well organic-rich material, syndepositional calcite goethite cement between their flanges, thus reinforcing awareness metazoan/microorganism interactions The preservation in...
Abstract Vase-shaped microfossils (VSMs) occur in dolomitic extraclasts of indeterminate provenance within the basal diamictite Neoproterozoic Urucum Formation (Jacadigo Group) west-central Brazil, having an age constrained between 889±44 Ma (K-Ar; basement rocks) and 587±7 ( 40 Ar/ 39 Ar early metamorphic cryptomelane overlying manganese ore). Early isopachous carbonate cement entombed these VSMs, preserving rare direct evidence original wall composition that is carbonaceous (now...
Abstract Global Neoproterozoic glaciations are related to extreme environmental changes and the reprise of iron formation in rock record. However, lack narrow age constraints on Cryogenian successions bearing iron-formation deposits prevents correlation understanding these a global scale. Our new multiproxy data reveal long record for Jacadigo Group (Urucum District, Brazil) spanning Sturtian Marinoan ice ages. Deposition basal sequence Urucum Formation was influenced by continental...
Abstract Vase-shaped microfossils (VSMs) occur in dolostone clasts within conglomerates, breccias, and diamictites of the Neoproterozoic Urucum Formation, Jacadigo Group, southwest Brazil. Although their taphonomic history is distinct from those other VSM assemblages, morphometric comparison fossils with five others described previously North America Europe show that two species—the long-necked Limeta lageniformis Morais, Fairchild, Lahr Morais et al., 2017 funnel-necked Palaeoamphora...
Acritarchs, a polyphyletic group of acid-resistant organic-walled microfossils, dominate the eukaryotic microfossil record in Proterozoic (2500–541 Ma) yet exhibit significant reduction diversity and size at transition to Phanerozoic (541–520 Ma). Despite difficulty tracing phylogenetic relationships among acritarchs, changes their complexity through time have allowed use paleoecological biostratigraphic schemes. The Doushantuo-Pertatataka Ediacaran acritarch assemblage, for example, is...
Abstract Extensive phosphorite deposition is observed in the Neoproterozoic after a prolonged hiatus during most of Mesoproterozoic era. This event thought to represent an important record major palaeoenvironmental, palaeoceanographic and biotic changes that shaped ecosystems, suggesting close relationships between phosphogenesis preservation key Ediacaran biotas. However, high‐grade deposits are relatively uncommon, diminishing opportunity test current phosphate mineralization–deposition...
This study tests the presence of differential preservation in Devonian Malvinokaffric fauna from Chapada Group (Parana Basin, Brazil). Results EDXRF, EDS, Raman Spectroscopy, and petrographic analyses show shells that were originally calcite as hematite goethite fossils, while organisms with original calcium phosphate tend to be preserved inside phosphatic concretions. Both types are commonly associated pseudoframboids, sulfate minerals hematized fossils. From this evidence, a diagenetic...
Outcrop-based facies and stratigraphic studies in the region of Cáceres, State Mato Grosso, Brazil, subdivided Nobres Formation into: lower member, composed dolostone, intraclastic dolopackstones, sandy dolostones, stratiform stromatolites evaporitic molds, interpreted as tidal flat/sabkha deposits; upper constituted dolomitic sandstone, to domal wrinkled stromatolites, evaporite sandstones mudstones, mixed flat deposits. The stacking these deposits up 200 m thick is by meter-thick...
Outcrop-based facies and stratigraphic studies in the region of Cáceres, State Mato Grosso, Brazil, subdivided Nobres Formation into: lower member, composed dolostone, intraclastic dolopackstones, sandy dolostones, stratiform stromatolites evaporitic molds, interpreted as tidal flat/sabkha deposits; upper constituted dolomitic sandstone, to domal wrinkled stromatolites, evaporite sandstones mudstones, mixed flat deposits. The stacking these deposits up 200 m thick is by meter-thick...
A Formação Itaituba da Bacia do Amazonas é considerada o principal intervalo selante sistema petrolífero Barreirinha-Monte Alegre e grande parte dos dados microfaciológicos são oriundos de exposições na borda sul bacia. Entretanto, a identificação intervalos porosos desta unidade norte tem fomentado avaliações para desvendar como os processos diagenéticos influenciaram preservação poroso real papel no petrolífero. Nesse sentido, 80 seções delgadas confeccionadas partir amostras coletadas...
A aplicação de técnicas microfaciológicas em exposições carbonatos da Formação Itaituba (Grupo Tapajós), situados na borda norte Bacia do Amazonas, permitiu contribuir reconstituição paleogeográfica Pensilvaniano bacia, uma vez que as principais interpretações unidade são baseadas dados sul devido a facilidade logística acesso condições amazônicas. análise microfaciológica 80 seções delgadas sucessão carbonática aproximadamente 30 m individualização 10 microfácies...