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  • 1
    Electronic Resource
    Electronic Resource
    Prolonged KREEP magmatism on the Moon indicated by the youngest dated lunar igneous rock (2004)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 432 (2004), S. 209-211 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Primordial solidification of the Moon (or its uppermost layer) resulted in the formation of a variety of rock types that subsequently melted and mixed to produce the compositional diversity observed in the lunar sample suite. The initial rocks to crystallize from this Moon-wide molten layer ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature03070
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Melting of the Earth's lithospheric mantle inferred from protactinium– thorium–uranium isotopic data (2000)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 406 (2000), S. 293-296 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The processes responsible for the generation of partial melt in the Earth's lithospheric mantle and the movement of this melt to the Earth's surface remain enigmatic, owing to the perceived difficulties in generating large-degree partial melts at depth and in transporting small-degree ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35018550
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Crust-mantle interaction in continental arcs: inferences from the Mesozoic arc in the southwestern United States (1991)
    Springer
    Contributions to mineralogy and petrology 107 (1991), S. 124-134 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Arc magmas ranging in composition from basaltic andesites to rhyolites and intrusive equivalents were emplaced into the western margin of the North American craton starting in Late Triassic time giving way to rift0related sedimentation in the Late Jurassic. The region of this study cuts across Proterozoic basements of contrasting Nd model ages, 1.7–1.8 Ga (average ɛNd∼−11) in eastern Arizona and 2.0 to 2.3 GA (average ɛNd∼−18) in western Arizona and eastern California (Bennett and DePaolo 1987). The Mesozoic rocks have initial ɛNd of -3.4 to-6.4 in the eastern part of the study area and -7.1 to -9.2 in the western part. All of the rocks have elevated 87Sr/87Sr initial ratios (〉0.706). Trends in initial ɛNd values of Mesozoic arc rocks are directly correlated with the Nd model ages of the basement through which they passed. Simple two-component mixing calculations indicate that recycled continental crust in the arc magmas represents on average about 65%. A minimum of 35% mantle input into continental arc magmas, as recent as the Mesozoic, represents a significant contribution to the growth of the continental crust, in the absence of a return flow of continental material into the mantle of similar magnitude. In a detailed study in the Santa Rita Mountains. Arizona, there is a pattern of increase of ɛNd with time: early basaltic andesites have more negative ɛNd than later felsic rocks. A correlated pattern of depletion with time is also observed with trace element and major element data. We attribute this either to progressive hybridization of the lower crust by repeated injection of mantle magmas, or the progressive thinning of the continental crust during prolonged arc magmatism. The present data do not allow distinction between the two models. Progressive decrease in crustal contribution to arc magmas with time may be an important feature of continental arc evolution. Hybridization of the lower crust due to repeated injection of mantle melts during arc magmatism may help contribute to small-scale heterogeneities in lower crust inferred from seismic and xenolith data. Similarly, whether there is a well defined MOHO or sharp crust-mantle boundary in any given segment of the continental crust may in part depend on the extent of crust modification as a result of continental arc magmatism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00311190
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    Paper (German National Licenses)
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  • 4
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    Constraints on global mean sea level during Pliocene warmth (2019)
    PANGAEA
    In:  Supplement to: Dumitru, Oana-Alexandra; Austermann, Jacqueline; Polyak, Victor J; Fornós, Joan J; Asmerom, Yemane; Ginés, Joaquín; Ginés, Angel; Onac, Bogdan P (2019): Constraints on global mean sea level during Pliocene warmth. Nature, https://doi.org/10.1038/s41586-019-1543-2
    Details
    Publication Date: 2023-01-30
    Description: Reconstructing the evolution of sea level during past warmer epochs such as the Pliocene provides insight into the response of sea level and ice sheets to prolonged warming. Although estimates of global mean sea level (GMSL) during this time do exist, they vary by several tens of metres, hindering the assessment of past and future ice-sheet stability. Here we show that during the mid-Piacenzian Warm Period, which was on average 2-3 degrees Celsius warmer than the pre-industrial period, the GMSL (sea-level equivalent changes in global ice volume) was about 16.2 metres higher than today. During the even warmer Pliocene Climatic Optimum (about 4 degrees Celsius warmer than pre-industrial), our results show that GMSL was 23.5 metres above the present level (m.a.p.s.l.). We present six GMSL data points, ranging from 4.39 to 3.27 million years ago, that are based on overgrowths on phreatic (from water-filled caves) speleothems from the western Mediterranean Sea, near Mallorca, Spain. This record is unique owing to its clear relationship to sea level, its reliable U-Pb ages and its long timespan, which allows us to quantify uncertainties on potential uplift. Our data indicate that ice sheets are very sensitive to warming and provide important calibration targets for future ice-sheet models.
    Keywords: Mallorca; paleo sea-level; phreatic overgrowth on speleothems; Pliocene; uranium-lead dating
    Type: Dataset
    Format: application/zip, 4 datasets
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    DATA PANGAEA
  • 5
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    Radiogenic isotopic record of Pliocene Speleothems from Coves d'Artá, Mallorca (2019)
    PANGAEA
    Details
    Publication Date: 2023-01-30
    Keywords: Coves_dArta_AR02; Coves_dArta_AR03; Coves_dArta_AR05; Coves_dArta_AR09; Coves_dArta_AR11; Coves_dArta_AR15; Coves d'Arta, Mallorca, Spain; Event label; Lead; Lead, error, relative; Lead-206/Lead-204 ratio; Lead-206/Lead-204 ratio, error, relative; Lead-206/Lead-208, error, relative; Lead-206/Lead-208 ratio; Lead-207/Lead-204 ratio; Lead-207/Lead-204 ratio, error; Lead-207/Lead-206, error, relative; Lead-207/Lead-206 ratio; Mallorca; paleo sea-level; phreatic overgrowth on speleothems; Pliocene; Sample code/label; Speleothem sample; SPS; Thorium; Thorium, error; Thorium-230/Uranium-238, error, relative; Thorium-230/Uranium-238 ratio; Uranium; Uranium, error; Uranium-235/Lead-204, error, relative; Uranium-235/Lead-204 ratio; Uranium-238/Lead-204, error, relative; Uranium-238/Lead-204 ratio; Uranium-238/Lead-206, error, relative; Uranium-238/Lead-206 ratio; uranium-lead dating; δ234 Uranium; δ234 Uranium, standard error
    Type: Dataset
    Format: text/tab-separated-values, 1890 data points
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    DATA PANGAEA
  • 6
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    Percentiles of global mean sea level during Pliocene warmth (2019)
    PANGAEA
    Details
    Publication Date: 2023-01-30
    Keywords: AGE; Age, standard deviation; Coves_dArta_AR02; Coves_dArta_AR03; Coves_dArta_AR05; Coves_dArta_AR09; Coves_dArta_AR11; Coves_dArta_AR15; Coves d'Arta, Mallorca, Spain; Event label; Global mean sea level; Mallorca; paleo sea-level; phreatic overgrowth on speleothems; Pliocene; Speleothem sample; SPS; uranium-lead dating
    Type: Dataset
    Format: text/tab-separated-values, 600 data points
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    DATA PANGAEA
  • 7
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    Global mean sea level during Pliocene warmth based on speleothem U-Pb dating (2019)
    PANGAEA
    Details
    Publication Date: 2023-04-15
    Keywords: AGE; Global mean sea level; Global mean sea level, uncertainty; Mallorca; paleo sea-level; phreatic overgrowth on speleothems; Pliocene; uranium-lead dating
    Type: Dataset
    Format: text/tab-separated-values, 8135 data points
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    DATA PANGAEA
  • 8
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    Global CO2 reconstruction (2019)
    PANGAEA
    Details
    Publication Date: 2023-04-15
    Keywords: AGE; Carbon dioxide; Gas chromatography; Mallorca; paleo sea-level; phreatic overgrowth on speleothems; Pliocene; uranium-lead dating
    Type: Dataset
    Format: text/tab-separated-values, 2001 data points
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    DATA PANGAEA
  • 9
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    A 2400 yr Mesoamerican rainfall reconstruction links climate and cultural change (2012)
    Geological Society of America (GSA)
    Details
    Publication Date: 2012-03-01
    Description: Droughts are a recurring feature of Mexican climate, but few high-resolution data are available to test for climate-change forcing of Mesoamerican civilizations. We present a quantitative 2400 yr rainfall reconstruction for the Basin of Mexico, from a precisely dated and highly resolved speleothem, that documents highly variable rainfall over the past 2400 yr. Dry conditions peaked during a 150-yr-long late Classic (ca. 600–900 CE) (Common Era) megadrought that culminated at 770 CE which followed centuries of climatic drying that spanned the fall of the city of Teotihuacán ca. 550 CE. The wettest conditions in the 1450s CE were associated with flooding in the Basin of Mexico. Our data suggest that rainfall variability was likely forced by the El Niño–Southern Oscillation, and impacts on spring-fed irrigation agriculture may have been a stressor on Mesoamerican civilizations.
    Print ISSN: 0091-7613
    Electronic ISSN: 1943-2682
    Topics: Geosciences
    Published by Geological Society of America (GSA)
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    PAPER CURRENT
  • 10
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    Shrinking of the Colorado Plateau via lithospheric mantle erosion: Evidence from Nd and Sr isotopes and geochronology of Neogene basalts (2011)
    Geological Society of America (GSA)
    Details
    Publication Date: 2011-01-01
    Description: Geochronologic data from the southern margins of the Colorado Plateau (western United States) show an inboard radial migration of Neogene basaltic magmatism. Nd and Sr isotopic data show that as basaltic volcanism migrates inboard it also becomes increasingly more asthenospheric. Strongly asthenospheric alkali basalt ({varepsilon}Nd 〉 4) appeared on the western plateau margin ca. 5 Ma, on the southeastern margin at 7 Ma, and is lacking from the plateau's other margins. Tomographic data suggest that low-velocity mantle underlies almost all recent (younger than 1 Ma) basaltic volcanism in a ring around much of the Colorado Plateau at a depth of 80 km. The combined isotopic and tomographic data indicate that the low-velocity mantle is asthenosphere along the western and southeastern margins of the plateau, but modified lithosphere around the remaining margins. Temporal and spatial patterns suggest a process by which upwelling asthenosphere is progressively infiltrating and replacing lithospheric mantle, especially where Proterozoic boundaries exist. This model explains (1) the dramatic velocity contrast seen well inboard of the physiographic edge of the plateau, (2) the inboard sweep of Neogene magmatism, and (3) isotopic evidence that much (but not all) of the low-velocity mantle is asthenospheric. These data support models that ongoing uplift of the edges of the Colorado Plateau is driven by mantle processes.
    Print ISSN: 0091-7613
    Electronic ISSN: 1943-2682
    Topics: Geosciences
    Published by Geological Society of America (GSA)
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    PAPER CURRENT
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