Unique conifer assemblage from Late Jurassic-Early Cretaceous deposits (NE Brazil) unveils the paleoclimate and paleobiogeography in the interior of equatorial Gondwana

Cretaceous Research, Journal Year: 2025, Volume and Issue: unknown, P. 106099 - 106099

Published: Feb. 1, 2025

Language: Английский

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Provenance evolution and drainage reorganization during tectonic inversion of a continental rift basin: Detrital zircon evidence from the Late Cretaceous Songliao Basin, NE China

Cretaceous Research, Journal Year: 2025, Volume and Issue: unknown, P. 106077 - 106077

Published: Jan. 1, 2025

Language: Английский

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Application of Ostracoda from the Lower Cretaceous Liupanshan Group at Pingliang (NW China) – Biostratigraphy and palaeoecology

Cretaceous Research, Journal Year: 2025, Volume and Issue: unknown, P. 106079 - 106079

Published: Jan. 1, 2025

Language: Английский

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A Model Framework for Scaling Pre‐Quaternary Cosmogenic Nuclide Production Rates

Geochemistry Geophysics Geosystems, Journal Year: 2025, Volume and Issue: 26(1)

Published: Jan. 1, 2025

Abstract Cosmogenic nuclide dating is an essential component of studying Earth surface processes, but it requires knowledge how production rates vary in time and space. Typically, are calibrated at sites with independently well‐constrained exposure histories then scaled to other interest using scaling frameworks that account for spatial temporal variations the secondary cosmic‐ray flux Earth's surface. To date, schemes terrestrial cosmogenic have been developed Quaternary, yet applications extend beyond Quaternary becoming more prevalent. For these deeper applications, rate calculations models optimized latest neglect longer term spatiotemporal geomagnetic field intensity, paleogeography, paleoatmospheric depth. We present a scheme past 70 million years, SPRITE (Scaling Production Rates In deep TimE). This framework extends existing into by (a) accounting site‐specific changes paleolatitude, (b) integrating intensity model rooted data from global paleomagnetic database, (c) incorporating climate‐driven, time‐varying atmospheric depths. evaluate efficacy our applying sets paleoexposure sites, apparent continuous million‐year histories. can be applied measurements stable nuclides research questions such as constraining hiatus durations between ancient lava flows calculating formation timescales landforms arid environments over millions years.

Language: Английский

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Campanian-Maastrichtian evolution of sedimentary systems during the final stages of an epeiric sea —La Luna Sea— in eastern Colombia: processes, spatio-temporal variability, and depositional controls

Marine and Petroleum Geology, Journal Year: 2025, Volume and Issue: unknown, P. 107385 - 107385

Published: March 1, 2025

Language: Английский

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The Coniacian sequence in the western Iberian Ranges (Spain): Stratigraphic architecture, systems tracts, biostratigraphy and high-frequency cyclicity

Cretaceous Research, Journal Year: 2025, Volume and Issue: unknown, P. 106121 - 106121

Published: March 1, 2025

Language: Английский

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Spatio-temporal distribution of global stromatolites through geological time identified by a large language model approach

Frontiers in Earth Science, Journal Year: 2025, Volume and Issue: 13

Published: March 31, 2025

Introduction A substantial amount of data embedded within diverse literature makes it time-consuming to manually extract and compile extensive datasets. The use large language models has become essential for the efficient extraction analysis big data. This study utilizes ChatGPT-4 reconstruct a global database stromatolites, spanning from Precambrian present, enhance our understanding their spatial temporal dynamics throughout geological time. Methods process involved several steps: First, PDF documents containing stromatolite were gathered converted into text format. Second, was employed on occurrences, including locations, ages, strata, facies types each sentence in documents. Third, duplicates removed, organized three categories: 3,248 unique location-age pairs, 2,723 strata-age 1,723 strata-age-facies type combinations. Additionally, 2,565 paleogeographical locations stromatolite-bearing rocks reconstructed using modern latitude longitude coordinates corresponding Phanerozoic ages. Results newly obtained dataset reveals that occurrences peaked during Proterozoic, declined Early Phanerozoic, exhibited fluctuations Phanerozoic. Seven hotspots identified: United States, Australia, India, Canada, China, England, Russia. From Cambrian Jurassic, stromatolites predominantly distributed low middle latitudes, shifting higher latitudes Cretaceous Quaternary. proportion inland aquatic relative marine varied, ranging 10% 30% Mesoarchean Middle Mesoproterozoic, decreasing less than Late Mesoproterozoic Paleozoic, increasing 10%–30% Devonian remaining high (39%–53%) Discussion findings highlight variability shedding light evolution these microbial structures over distribution patterns suggest significant shifts environmental conditions provide valuable insights ecological dynamics. organize body demonstrates potential advancing research paleobiology geology.

Language: Английский

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Extreme impact of the Late Cretaceous–Paleocene tectonic events on the evolution of the southern Tethyan margin: a case study from Eastern Desert, Egypt

Journal of African Earth Sciences, Journal Year: 2025, Volume and Issue: unknown, P. 105663 - 105663

Published: April 1, 2025

Language: Английский

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Ecohydrology and paleoenvironment of the Cretaceous (Albian) Cloverly Formation: insights from multi-taxon oxygen isotope analysis of vertebrate phosphates

Frontiers in Earth Science, Journal Year: 2025, Volume and Issue: 13

Published: May 13, 2025

The Cloverly Formation of Montana and Wyoming preserves abundant nonmarine vertebrate fossils from the mid-Cretaceous, yet its paleoenvironment faunal niche structure remain poorly understood. We analyzed δ 18 Ο phosphate in over 100 fossil individuals multiple taxa collected a single microfossil bonebed Carbon County, Montana.To infer habitat preferences water-use strategies, we compared values within across taxa. reconstructed O surface_water semi-aquatic reptile using regressions calibrated with data modern environments extant Using multi-taxon framework, estimated warm-season water temperatures lepisosteid (gar) scales, then converted these to air climate transfer function. ranged 9.5‰ 23.2‰ (VSMOW) varied Aquatic groups exhibited lower than dinosaurian Our mean was −7.9‰ (95% CI: −10.1 5.5‰), yielding temperature 26°C an 24°C. Intertaxon differences reflect partitioning suggest primary isotopic signals are preserved. Unexpectedly high Bernissartiid-like neosuchian teeth may indicate greater ecohydrological diversity previously recognized. estimate aligns other Aptian-Albian proxies but exceeds model-based predictions, likely due outdated assumptions underlying model. MAWSAT falls upper range model-data assimilation outputs. These results provide new context for ecological fauna offer first quantitative Formation, helping define baseline conditions between Cold Snap Cretaceous Thermal Maximum.

Language: Английский

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Detection of Sedimentary Basins and Karstic Faults in the Yucatán Peninsula by Gravity Inversion and Euler Deconvolution

Earth, Journal Year: 2025, Volume and Issue: 6(2), P. 42 - 42

Published: May 16, 2025

The northern Yucatán Peninsula hosts a complex karstic environment shaped by carbonate platform development and the Chicxulub impact event, making subsurface characterization crucial for geological hydrogeological studies. This work aimed to resolve shallow crustal structure identify major tectonic features that influence karst processes groundwater dynamics. We applied rapid 3D gravity inversion method, linear back projection (LBP), Bouguer anomaly data, combined with Euler deconvolution map deep fault systems. produced high-resolution density model down 12.8 km depth, revealing key structures. Multilevel thresholding delineated significant low-density basins, notably crater, as well buried sedimentary basins. solutions identified networks coincide areas of intense karstification, particularly in eastern peninsula. Results highlight interplay between impact-related tectonics evolution, influencing flow paths recharge zones. study demonstrates effectiveness regional imaging platforms emphasizes need further local-scale surveys investigate coastal aquifer vulnerability saltwater intrusion processes.

Language: Английский

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