Showing 241 - 260 results of 292 for search '"Paleoproterozoic"', query time: 0.20s Refine Results
  1. 241

    Linkages between the southern Patagonia Pre-Permian basements: new insights from detrital zircons U-Pb SHRIMP ages from the Cerro Negro District by C. PERMUY VIDAL, P. MOREIRA, D.M. GUIDO, C.M. FANNING

    Published 2014-06-01
    “…The minor oldest peaks yield Cambrian-Neoproterozoic; Mesoproterozoic and Paleoproterozoic-Archean ages, evidencing a common source from the interior of Gondwana. …”
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    Article
  2. 242

    Pre-Variscan granitoids with adakitic signature at west Getic basement of the South Carpathians (Romania): constraints on genesis and timing based on whole-rock and zircon geochemi... by Anca Dobrescu

    Published 2021-04-01
    “…The rich zircon inheritance reveals Neoproterozoic juvenile source and older crustal components represented by Neoarchean to Paleoproterozoic zircons. …”
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    Article
  3. 243

    Palaeoclimate change during Glacial Periods: Evidence from Sri Lanka by J. Katupotha

    Published 2013-04-01
    “…It is revealed thatGondwanaland emerged between the Huronian glaciation (2300-2100 Ma) in the Paleoproterozoic Eraand the Andean-Saharan glaciation (460-420 Ma) in the Early Paleozoic Era. …”
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  4. 244

    Alluvial Sedimentary Records in Indian Precambrian Basins: Implications Toward Unique Precambrian Sedimentary Environment? by Partha Pratim Chakraborty, Partha Pratim Chakraborty, Rahul Bailwal, Pritam P. Paul, Aditi Sharma

    Published 2022-07-01
    “…From the collation of data on alluvial deposits from a number of Indian Precambrian basins, augmented by new data from the Bayana basin, a Paleoproterozoic basin in the North Delhi fold belt, the present study attempts to document nuances and intricacies in Precambrian alluvial sedimentation motif that include facies architecture and paleohydrology. …”
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  5. 245

    GEOCHRONOLOGY OF THE CHADOBETS ALKALINE ULTRAMAFIC CARBONATITE COMPLEX (SIBERIAN CRATON): NEW U-Pb AND Ar-Ar DATA by I. R. Prokopyev, A. G. Doroshkevich, A. V. Malyutina, A. E. Starikova, A. V. Ponomarchuk, D. V. Semenova, S. A. Kovalev, I. A. Savinsky

    Published 2021-12-01
    “…The first two clusters correspond to the dates of activity of Paleoproterozoic granitoid magmatism and Paleozoic alkaline-mafic tectono-magmatic activity, widely occurred in the Siberian craton and its southern framing. …”
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  6. 246

    Rapid oxygenation of Earths atmosphere 2.33 billion years ago by Luo, Genming, Ono, Shuhei, Beukes, Nicolas J., Wang, David T., Xie, Shucheng, Summons, Roger E

    Published 2016
    “…Although “whiffs” of oxygen have been documented in the Archean atmosphere, substantial O2 did not accumulate irreversibly until the Early Paleoproterozoic, during what has been termed the Great Oxygenation Event (GOE). …”
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  7. 247
  8. 248

    Did Patagonia collide with Gondwana in the Late Paleozoic? Some insights from a multidisciplinary study of magmatic units of the North Patagonian Massif by A.E. RAPALINI, M.G. LÓPEZ DE LUCHI, C. MARTÍNEZ DOPICO, F.G. LINCE KLINGER, M.E. GIMÉNEZ, PATRICIA MARTÍNEZ

    Published 2011-01-01
    “…Crustal continuity between the North Patagonian Massif and the Pampia and Arequipa- Antofalla terranes is suggested by similar Late Paleoproterozoic crustal model ages, comparable detrital zircon ages in Early Paleozoic successions, the apparent continuity of an Early Ordovician continental magmatic arc and paleomagnetic data. …”
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    Article
  9. 249

    The Crustal Anisotropy of West Ordos Block and Its Geodynamic Implications by Jinyu Lv, Xuzhang Shen, Liuting Huang, Xiaohui He, He Huang, Wenjun Zheng, Dongli Zhang, Jian Zhang

    Published 2021-07-01
    “…The fast wave direction of crustal anisotropy in the north Ordos block is distinctly different from that in the south Ordos block, both well related to the major geological events, such as the Paleoproterozoic continent‐to‐continent collision between the Ordos Block and the Yinshan Block, the collision between the Western Block and Eastern Block of the North China Craton and the material migration from the Tibetan plateau in Cenozoic. …”
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  10. 250

    Combined Genomic and Imaging Techniques Show Intense Arsenic Enrichment Caused by Detoxification in a Microbial Mat of the Dead Sea Shore by C. Thomas, M. Filella, D. Ionescu, S. Sorieul, C. G. L. Pollier, A. M. Oehlert, P. Zahajská, N. Gedulter, A. Agnon, D. Ferreira Sanchez, D. Ariztegui

    Published 2024-03-01
    “…In this context, this example calls for caution in interpreting metal(loid) enrichment in organic matter‐rich layers and microbialites of Paleoproterozoic origin. Arsenic signatures in Precambrian organic matter and carbonate rocks may host biosignatures, including evidence for extracellular polymeric substances, As‐binding and detoxification processes, without supporting arsenotrophy. …”
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  11. 251

    Imaging the East European Craton margin in northern Poland using extended correlation processing of regional seismic reflection profiles by M. Mężyk, M. Malinowski, S. Mazur

    Published 2019-05-01
    “…Our new processing revealed reflectivity patterns, which we primarily associate with the Paleoproterozoic crust formed during the Svekofennian (Svekobaltic) orogeny, that are similar to those observed along the BABEL and FIRE profiles in the Baltic Sea and Finland, respectively. …”
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  12. 252

    FIELD TECTONOPHYSICS IN SOLUTIONS OF GEODYNAMIC EVOLUTION PROBLEMS OF THE UKRAINE TERRITORY by O. B. Gintov, A. V. Murovskaya, S. V. Mychak

    Published 2015-09-01
    “…Until the turn of 2.05–2.10 billion years, the region was subject to transtension and transpression, as the Western (gneiss-granulite) and Eastern (granite-greenstone) Archean microplates of USh moved to separate from each other in the Neo-Archean and then diverged and converged in the Paleoproterozoic (movements at a sharp angle). It is assumed that in the Archean the Western and Eastern microplates were separated by the oceanic or sub-oceanic lithosphere (Fig. 12, 13). …”
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  13. 253

    Using <sup>87</sup>Sr/<sup>86</sup>Sr LA-MC-ICP-MS Transects within Modern and Ancient Calcite Crystals to Determine Fluid Flow Events in Deep Granite Fractures by Henrik Drake, Ellen Kooijman, Melanie Kielman-Schmitt

    Published 2020-09-01
    “…Here, we apply high spatial resolution <sup>87</sup>Sr/<sup>86</sup>Sr spot analysis (80 µm) in transects through zoned calcite crystals in deep Paleoproterozoic granitoid fractures using laser ablation multi-collector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS) to trace discrete signs of paleofluid flow events. …”
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  14. 254

    A Contiguous Taltson‐Thelon Margin Revisited by J. A. Cutts, B. V. Dyck, M. G. Perrot, J. H. F. L. Davies, A. M. Osinchuk, D. Šilerová, R. A. Stern, M. Chiaradia, R. Canam

    Published 2024-07-01
    “…Samples collected to the north of the LRf are Neoarchean in age, have mantle‐like δ18O (4.7–5.8‰) and chondritic to juvenile εHf values (0–4.5), whereas those to the south are exclusively Paleoproterozoic in age and have more elevated δ18O (6.3–7‰) and much more evolved εHf values (−12 to −6); these results indicate that the LRf marks a crustal‐scale suture between the Slave craton and the Taltson magmatic zone. …”
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  15. 255

    Mapping the Structure and Metasomatic Enrichment of the Lithospheric Mantle Beneath the Kimberley Craton, Western Australia by Z. J. Sudholz, A. L. Jaques, G. M. Yaxley, W. R. Taylor, K. Czarnota, M. W. Haynes, L. Frewer, R. R. Ramsay, P. J. Downes, S. A. Cooper

    Published 2023-09-01
    “…The peridotite components are inferred to have formed as residues of polybaric partial mantle melting in the Archean, whereas eclogite likely represents former oceanic crust accreted during Paleoproterozoic subduction. This deep CLM was metasomatized by H2O‐rich melts derived from subducted sediments and high‐temperature FeO‐TiO2 melts from the asthenosphere.…”
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  16. 256

    Petrogenesis, geodynamic setting, age of Rhyacian igneous rocks, from Nampala gold deposit: Implications for the crustal growth of the Birimian terrain in southern Mali by Sory I.M. Konate, Mamadou L. Bouare, Anthony T. Bolarinwa, Daniel Kwayisi, Raymond Webrah Kazapoe, Elhadji Mory Traore, N.’Tcha Daniel Kouagou N’Dah

    Published 2025-12-01
    “…These signatures suggest a hybrid origin involving juvenile mantle melts and recycled Paleoproterozoic crust during an accretionary orogen. The Mg# and SiO2 contents of the granitoids' along with REE patterns and Ba, Sr, and Eu anomalies, imply melting of the delaminated lower crust. …”
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    Article
  17. 257

    Uranium Redox and Deposition Transitions Embedded in Deep‐Time Geochemical Models and Mineral Chemistry Networks by E. K. Moore, J. Li, A. Zhang, J. Hao, S. M. Morrison, D. R. Hummer, N. Yee

    Published 2024-02-01
    “…The number of U6+ mineral localities surpasses the number of U4+ mineral localities in the Paleoproterozoic. Moreover, the number of sedimentary U6+ mineral localities increases earlier in the Phanerozoic than the number of U4+ sedimentary mineral localities, likely due to the necessity of sufficient sedimentary organic matter to reduce U6+–U4+. …”
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  18. 258

    Wildfires and Monsoons: Cryptic Drivers for Highly Variable Provenance Signals within a Carboniferous Fluvial System by Bébhinn Anders, Shane Tyrrell, David Chew, Gary O’Sullivan, Chris Mark, John Graham, Eszter Badenszki, John Murray

    Published 2022-01-01
    “…Older and more distal sources, such as the Nagssugtoqidian Belt of East Greenland, become more prominent in stratigraphically younger channel sandstones suggesting catchment expansion. Paleoproterozoic to Mesoproterozoic sources are most dominant, yet the detrital grain cargo varies in each channel sandstone. …”
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  19. 259

    Reexamination of the crustal boundary context of Mesoproterozoic granites in southern Nevada using U-Pb zircon chronology and Nd and Pb isotopic compositions by Almeida, Rafael V., Cai, Yue, Hemming, Sidney R., Christie-Blick, Nicholas, Neiswanger, Lila S.

    Published 2019
    “…The modified isotopic province boundaries are now more consistent with each other than in earlier interpretations, a result that reinforces the view that these boundaries reflect fundamental tectonic features related to Paleoproterozoic crustal accretion. Our data imply that the spatial distribution of the classic anorogenic granite suite in North America is more restricted than previously thought. …”
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    Journal Article
  20. 260

    Geochemistry of basalts in unravelling the mantle processes and crustal evolution: Insights from the greenstone belts of western Dharwar Craton by C. Manikyamba, Arijit Pahari, M. Santosh, K.S.V. Subramanyam, G. Harshitha Reddy

    Published 2022-11-01
    “…The U-Pb zircon age of the Holenarsipur basalts indicate 3235 ± 54 Ma with multiple thermal overprints after their deposition due to Paleoproterozoic to Mesozoic dyke emplacement. The Holenarsipur and Chitradurga basalts show partial melting trend whereas the Shimoga basalts follow fractional crystallization trajectory. …”
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