Mostrando 2,021 - 2,040 Resultados de 2,293 Para Buscar '"volcán"', tiempo de consulta: 0.42s Limitar resultados
  1. 2021
    “…One group’s geochemical signature exhibits steep rare earth element (REE) patterns with negligible Eu anomalies, lower Yb, higher Sr, and negative Nb–Ta–Ti (NTT) anomalies, which indicate a volcanic-arc environment with a thickened crust in a convergent setting. …”
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  2. 2022
    “…It also has bearing upon designs for field portable (3)He/(4)He ratio detectors aimed at earthquake and volcanic eruption studies, and monitoring of nuclear sites.…”
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  3. 2023
    “…Contrary to the traditional view of the Late Ordovician extinctions, our study suggests a protracted crisis interval linked to intense volcanism during the middle Late Ordovician Katian Age. …”
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  4. 2024
    “…Magmas in volcanic arcs have geochemical and isotopic signatures that can be related to mantle metasomatism due to fluids and melts released by the down-going oceanic crust and overlying sediments, which modify the chemistry and mineralogy of the mantle wedge. …”
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  5. 2025
    “…The small upper Pleistocene diatreme of Polino (central Italy) is known in literature as one of the few monticellite alvikites (volcanic Ca-carbonatite) worldwide. This outcrop belongs to the Umbria-Latium Ultra-alkaline District (ULUD), an area characterized by scattered and small-volume strongly SiO(2)-undersaturated ultrabasic igneous rocks located in the axial sector of the Apennine Mts. in central Italy. …”
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  6. 2026
  7. 2027
    “…From our data synthesis and modeling, we suggest that observations of warming, declining δ(13)C and a relatively stable CCD can be broadly reproduced by mid‐Paleogene increases in volcanic CO(2) outgassing and weathering. However, remaining data‐model discrepancies hint at missing processes in our model, most likely involving the preservation and burial of organic carbon. …”
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  8. 2028
    “…The quadratic reduced seismic velocity and pressure were calculated to track the temporal variation of volcanic elastic radiation, and the lava fountain height was estimated by thermal camera image processing. …”
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  9. 2029
    “…We found non-native kelps, with a wide range of “hitchhiking” passenger organisms, on an Antarctic beach inside the flooded caldera of an active volcanic island. This is the first evidence of non-native species reaching the Antarctic continent alive on kelp rafts. …”
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  10. 2030
    “…Shallow hydrothermal vent environments are typically very warm and acidic due to the mixing of ambient seawater with volcanic gasses (> 92% CO(2)) released through the seafloor making them potential ‘natural laboratories’ to study long-term adaptations to extreme hypercapnic conditions. …”
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  11. 2031
    “…Appointing full-time disaster managers, developing a disaster information management system, massive information drive, organizing village-based volunteers, integrating disaster management into formal education, and mandatory trainings for officials, preparing for a possible major volcanic eruption and crafting a comprehensive plan against emerging emergencies like the COVID-19 pandemic may lead to a 360° preparedness.…”
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  12. 2032
    “…The models estimated that Salvia species occupy an area of 23,541 km(2) in the State, 72% in the Trans-Mexican Volcanic Belt and a second richest ecoregion is the Sierra Madre del Sur. …”
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  13. 2033
  14. 2034
    “…The mixing of acidic, metal-bearing hydrothermal plumes from volcanic ridge systems with more alkaline, organic-bearing plumes generated by serpentinization of ultramafic rocks brought together essential building blocks for life in solutions conducive to greenalite precipitation. …”
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  15. 2035
    “…The solid earth plays a major role in controlling Earth’s surface climate. Volcanic degassing of carbon dioxide (CO(2)) and silicate chemical weathering are known to regulate the evolution of climate on a geologic timescale (> 10(6) yr), but the relationship between the solid earth and the shorter (< 10(5) yr) fluctuations of Quaternary glacial–interglacial cycles is still under debate. …”
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  16. 2036
    “…Fluid release from subducting oceanic lithosphere is a key process for subduction zone geodynamics, from controlling arc volcanism to seismicity and tectonic exhumation. However, many fundamental details of fluid composition, flow pathways, and reactivity with slab‐forming rocks remain to be thoroughly understood. …”
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  17. 2037
    “…Volcanic CO(2) seeps are natural laboratories that can provide insights into the adaptation of species to ocean acidification. …”
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  18. 2038
    “…BACKGROUND: The volcano rabbit is the smallest lagomorph in Mexico, it is monotypic and endemic to the Trans-Mexican Volcanic Belt. It is classified as endangered by Mexican legislation and as critically endangered by the IUCN, in the Red List. …”
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  19. 2039
    “…The presence of the tuff and the barite layer in the Sansui V deposits indicates that the formation of the associated V deposits was closely related to either a volcanic or hydrothermal activity. Analysis of geochemistry and sedimentation suggests a hydrothermal source of the metals, where the mineralization of V is related to clay and organic matter. …”
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  20. 2040
    “…Volcanic ash-derived soils are characterized by low pH (pH ≤ 5.5) with increased concentrations of aluminum (Al(3+)) and manganese (Mn(2+)), which decreases plant growth, fruit quality, and yield. …”
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