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    In:  Supplement to: Kinman, William S; Neal, Clive R; Davidson, Jon P; Font, Laura (2009): The dynamics of Kerguelen Plateau magma evolution: New insights from major element, trace element and Sr isotope microanalysis of plagioclase hosted in Elan Bank basalts. Chemical Geology, 264(1-4), 247-265, https://doi.org/10.1016/j.chemgeo.2009.03.010
    Publication Date: 2024-01-09
    Description: The Kerguelen Plateau and Broken Ridge in the southern Indian Ocean together represent one of the most voluminous large igneous provinces (LIPs) ever emplaced on Earth. A scientific objective of Ocean Drilling Program (ODP) Leg 183 was to constrain the post-melting magma evolution of Kerguelen Plateau magmas. In an effort to better understand this evolution, isotopic and trace element analysis of individual plagioclase crystals hosted within two Kerguelen Plateau basalts recovered from Elan Bank were undertaken. Previous whole-rock studies established that the two host basalts investigated in this study are samples of crustally contaminated (lower group) and relatively uncontaminated (upper group) basalt. Plagioclase phenocrysts from the uncontaminated basalt are dominantly normal zoned and exhibit a 87Sr/86SrI range of 0.704845-0.704985, which overlaps uncontaminated group whole-rock values previously reported. Plagioclase crystals from the contaminated basalt are dominantly reverse zoned and exhibit a 87Sr/86SrI range of 0.705510-0.705735, which all lie within contaminated group whole-rock values previously reported. There are no systematic within crystal core to rim variations in 87Sr/86SrI from either group, with the exception that contaminated group crystal rims have overall less radiogenic 87Sr/86SrI than other zones. These observations indicate that crustal assimilation occurred before the formation of Unit 10 plagioclase phenocrysts, which is supported by parent magma trace element abundance data inverted using carefully calculated partition coefficients. Trace element diffusion modeling indicates that the upper group basalt (Unit 4) experienced a more vigorous eruptive flux than the lower group basalt (Unit 10). We suggest that plagioclase phenocrysts in both the upper and lower group basalts originated from the shallowest section of what was likely a complex magma chamber system. We contend that the magmatic system contained regions of extensive plagioclase-dominated crystal mush. Crustal assimilation was not a significant ongoing process in this portion of the Elan Bank magmatic system. Both basalts exhibit compelling evidence for remobilization and partial resorption of crystalline debris (e.g., reverse zoned crystals, glomerocrysts). We suggest Unit 4 and 10 magmas ascended different sections of the Elan Bank magma system, where the Unit 10 magmas ascended a section of the magma system that penetrated a stranded fragment of continental crust.
    Keywords: 183-1137A; DRILL; Drilling/drill rig; Indian Ocean; Joides Resolution; Leg183; Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 5 datasets
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  • 3
    Publication Date: 2024-01-09
    Keywords: 183-1137A; Aluminium oxide; Anorthite; Barium; Calcium oxide; Cerium; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Electron microprobe (EMP); Elements, total; Europium; Indian Ocean; Iron oxide, FeO; Joides Resolution; LA-ICP-MS, Laser-ablation inductively coupled plasma mass spectrometer; Lanthanum; Lead; Leg183; Magnesium oxide; Neodymium; Ocean Drilling Program; ODP; Phosphorus pentoxide; Potassium oxide; Praseodymium; Rubidium; Samarium; Sample code/label; Sample code/label 2; Sample comment; Scandium; Silicon dioxide; Sodium oxide; Strontium; Titanium; Titanium dioxide; Vanadium; Yttrium
    Type: Dataset
    Format: text/tab-separated-values, 834 data points
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  • 4
    Publication Date: 2024-01-09
    Keywords: 183-1137A; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Indian Ocean; Joides Resolution; LA-ICP-MS, Laser-ablation inductively coupled plasma mass spectrometer; Leg183; Ocean Drilling Program; ODP; Rubidium/Strontium ratio; Sample code/label; Sample code/label 2; Sample comment; Strontium-87/Strontium-86 ratio; Strontium-87/Strontium-86 ratio, error
    Type: Dataset
    Format: text/tab-separated-values, 136 data points
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  • 5
    Publication Date: 2024-01-09
    Keywords: 183-1137A; Anorthite; Barium; Barium, partition coefficient; Cerium; Cerium, partition coefficient; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Indian Ocean; Joides Resolution; Lanthanum; Lanthanum, partition coefficient; Leg183; Neodymium; Neodymium, partition coefficient; Ocean Drilling Program; ODP; Praseodymium; Praseodymium, partition coefficient; Rubidium; Rubidium, partition coefficient; Samarium; Samarium, partition coefficient; Sample code/label; Sample code/label 2; Sample comment; Strontium; Strontium, partition coefficient; Yttrium; Yttrium, partition coefficient
    Type: Dataset
    Format: text/tab-separated-values, 660 data points
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  • 6
    Publication Date: 2024-01-09
    Keywords: 183-1137A; Aluminium oxide; Anorthite; Barium; Calcium oxide; Cerium; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Electron microprobe (EMP); Elements, total; Europium; Indian Ocean; Iron oxide, FeO; Joides Resolution; LA-ICP-MS, Laser-ablation inductively coupled plasma mass spectrometer; Lanthanum; Lead; Leg183; Magnesium oxide; Neodymium; Ocean Drilling Program; ODP; Phosphorus pentoxide; Potassium oxide; Praseodymium; Rubidium; Samarium; Sample code/label; Sample code/label 2; Sample comment; Scandium; Silicon dioxide; Sodium oxide; Strontium; Titanium; Titanium dioxide; Vanadium; Yttrium
    Type: Dataset
    Format: text/tab-separated-values, 756 data points
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  • 7
    Publication Date: 2024-01-09
    Keywords: 183-1137A; Anorthite; Barium; Barium, partition coefficient; Cerium; Cerium, partition coefficient; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Indian Ocean; Joides Resolution; Lanthanum; Lanthanum, partition coefficient; Leg183; Neodymium; Neodymium, partition coefficient; Ocean Drilling Program; ODP; Praseodymium; Praseodymium, partition coefficient; Rubidium; Rubidium, partition coefficient; Samarium; Samarium, partition coefficient; Sample code/label; Sample code/label 2; Sample comment; Strontium; Strontium, partition coefficient; Yttrium; Yttrium, partition coefficient
    Type: Dataset
    Format: text/tab-separated-values, 594 data points
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Contributions to mineralogy and petrology 119 (1995), S. 387-408 
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Small basalt to dacite volcanic centers are distributed sparsely over the Bolivian Altiplano, behind the Andean volcanic front. Most are Pliocene to Recent in age, and are characterized by textural and mineralogical disequilibrium with abundant xenoliths and xenocrysts. True phenocrysts are rare in the more mafic samples. Compared with Recent volcanic rocks from Andean stratovolcanoes, the Bolivian centers overlap in major element trends. Incompatible element contents tend to be higher, particularly in the eastern Altiplano. The ranges of isotopic compositions reflect ubiquitous crustal contamination. Pb isotope compositions are dominated by Pb from isotopically heterogeneous basement, resulting in a wide scatter of data lying between inferred crustal compositions and showing little overlap with possible mantle sources in the region. Rocks sampled from the Bolivian Altiplano were probably derived from asthenospheric mantle and subjected to extensive open system differentiation during ascent through the 70 km thick crust of the region. Major element trends are largely controlled by the fractionating phase assemblage (olivine, clinopyroxene and amphibole). Trace element and isotope systematics, however, defy realistic attempts at modeling due to the geographic scatter of samples, the uniformity of compositions at a given center, and the heterogeneity of the contaminant. Nevertheless, there are first order systematic trace element variations that appear to relate to the geometry of the subduction zone. In particular, LIFE/HFSE (exemplified by Ba/Nb), and Zr/Nb ratios decrease from the arc front eastward into the Altiplano. These variations are not easily reconciled with control by crustal contamination alone. A model is proposed in which the asthenospheric source is fluxed by high Ba/Nb slab-derived fluid to induce melting. Beneath the arc, high fluid flux increases the Ba/Nb ratio of the asthenosphre and leads to high degrees of partial melting (high Zr/Nb). To the east, lower or no fluid flux leads to low Ba/Nb and low degrees of partial melting (low Zr/Nb). Melting in the back arc region of the Altiplano may be facilitated by lithospheric delamination that leads to decompression melting of counter-flowing asthenosphere. There is no unequivocal evidence that requires a significant role for the lithospheric mantle.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 306 (1983), S. 253-256 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The geology of the Lesser Antilles volcanic arc, and tectonics of the Caribbean region are well documented5-8. The island of Martinique consists of several separate volcanic centres varying in age from 0 to 25 Myr (ref. 9). Following an extensive geochemical survey of the arc, Brown et al.10 ...
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  • 10
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The lavas of the Cameroon line display a lead isotope anomaly at the continent/ocean boundary which can be attributed to a fossil mantle plume, the diminishing lateral effects of which can be recognized as far as 400km to either side. The high 206Pb/204Pb ...
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