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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science Ltd
    Terra nova 17 (2005), S. 0 
    ISSN: 1365-3121
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: We studied more than 60 oceanic gabbros from the recent oceanic crust and from ophiolites (East Pacific Rise, Mid-Atlantic Ridge, Southwest Indian Ridge, Oman ophiolite) by scanning electron microscopy and found in nearly all samples microstructures suggesting that hydrous partial melting reactions proceeded. The characteristic paragenesis consists of orthopyroxene and pargasite rimming olivine and clinopyroxene primocrysts in intimate contact with neoblastic plagioclase strongly enriched in anorthite. This is in agreement with recent water-saturated melting experiments on a variety of natural gabbros between 900 and 1000 °C. The observed microtextures in the natural gabbros imply the propagation of water-rich fluids on grain boundaries in a ductile regime causing hydrous partial melting. Thus, this type of hydrothermal activity proceeds within the deep oceanic crust at very high temperatures (900–1000 °C) without a crack system, a prerequisite in current models for enabling hydrothermal circulation.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2024-01-09
    Keywords: 176-735B; Aluminium oxide; Aluminium oxide, standard deviation; Calcium oxide; Calcium oxide, standard deviation; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Electron microprobe (EMP); Indian Ocean; Iron oxide, FeO; Iron oxide, FeO, standard deviation; Joides Resolution; Leg176; Magnesium oxide; Magnesium oxide, standard deviation; Manganese oxide; Manganese oxide, standard deviation; Number of observations; Ocean Drilling Program; ODP; Potassium oxide; Potassium oxide, standard deviation; Sample code/label; Sample code/label 2; Silicon dioxide; Silicon dioxide, standard deviation; Sodium oxide; Sodium oxide, standard deviation; Titanium dioxide; Titanium dioxide, fractionated
    Type: Dataset
    Format: text/tab-separated-values, 46 data points
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  • 3
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    PANGAEA
    In:  Supplement to: Koepke, Jürgen; Feig, Sandrin T; Snow, Jonathan E; Freise, Marcus (2004): Petrogenesis of oceanic plagiogranites by partial melting of gabbros: an experimental study. Contributions in Mineralogy and Petrology, 146(4), 414-432, https://doi.org/10.1007/s00410-003-0511-9
    Publication Date: 2024-01-09
    Description: We performed hydrous partial melting experiments at shallow pressures (0.2 GPa) under slightly oxidizing conditions (NNO oxygen buffer) on oceanic cumulate gabbros drilled by ODP (Ocean Drilling Program) cruises to evaluate whether the partial melting of oceanic gabbro can generate SiO2-rich melts with compositions typical of oceanic plagiogranites. The experimental melts of the low-temperature runs broadly overlap those of natural plagiogranites. At 940 °C, the normalized SiO2 contents of the experimental melts of all systems range between 60 and 61 wt%, and at 900 °C between 63 and 68 wt%. These liquids are characterized by low TiO2 and FeOtot contents, similar to those of natural plagiogranites from the plutonic section of the oceanic crust, but in contrast to Fe and Ti-rich low-temperature experimental melts obtained in MORB systems at ~950 °C. The ~1,500-m-long drilled gabbroic section of ODP Hole 735B (Legs 118 and 176) at the Southwest Indian Ridge contains numerous small plagiogranitic veins often associated with zones which are characterized by high-temperature shearing. The compositions of the experimental melts obtained at low temperatures match those of the natural plagiogranitic veins, while the compositions of the crystals of low-temperature runs correspond to those of minerals from high-temperature microscopic veins occurring in the gabbroic section of the Hole 735B. This suggests that the observed plagiogranitic veins are products of a partial melting process triggered by a water-rich fluid phase. If the temperature estimations for hightemperature shear zones are correct (up to 1,000 °C), and a water-rich fluid phase is present, the formation of plagiogranites by partial melting of gabbros is probably a widespread phenomenon in the genesis of the ocean crust.
    Keywords: 153-923A; 176-735B; DRILL; Drilling/drill rig; Indian Ocean; Joides Resolution; Leg153; Leg176; Ocean Drilling Program; ODP; South Atlantic Ocean
    Type: Dataset
    Format: application/zip, 6 datasets
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  • 4
    Publication Date: 2024-01-09
    Keywords: 153-923A; Aluminium oxide; Aluminium oxide, standard deviation; Calcium oxide; Calcium oxide, standard deviation; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Electron microprobe (EMP); Iron oxide, FeO; Iron oxide, FeO, standard deviation; Joides Resolution; Leg153; Magnesium oxide; Magnesium oxide, standard deviation; Manganese oxide; Manganese oxide, standard deviation; Number of observations; Ocean Drilling Program; ODP; Potassium oxide; Potassium oxide, standard deviation; Sample code/label; Sample code/label 2; Silicon dioxide; Silicon dioxide, standard deviation; Sodium oxide; Sodium oxide, standard deviation; South Atlantic Ocean; Titanium dioxide; Titanium dioxide, fractionated
    Type: Dataset
    Format: text/tab-separated-values, 23 data points
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  • 5
    Publication Date: 2024-01-09
    Keywords: 176-735B; Atterberg settling tubes; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Fugacity of hydrogen gas; Indian Ocean; Internally heated pressure vessel (IHPV); Joides Resolution; Leg176; Melt fraction; Minerals; Ocean Drilling Program; ODP; Sample code/label; Sample code/label 2; Sample comment; Temperature, technical; Time in hours; xH2O fluid phase
    Type: Dataset
    Format: text/tab-separated-values, 141 data points
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  • 6
    Publication Date: 2024-01-09
    Keywords: 176-735B; Aluminium oxide; Aluminium oxide, standard deviation; Anorthite; Calcium oxide; Calcium oxide, standard deviation; Comment; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Electron microprobe (EMP); Energy dispersive X-ray analysis, EDAX; Forsterite; Indian Ocean; Iron oxide, FeO; Iron oxide, FeO, standard deviation; Joides Resolution; Leg176; Magnesium number; Magnesium oxide; Magnesium oxide, standard deviation; Manganese oxide; Manganese oxide, standard deviation; Minerals; Number of observations; Ocean Drilling Program; ODP; Phosphorus pentoxide; Phosphorus pentoxide, standard deviation; Potassium oxide; Potassium oxide, standard deviation; Sample code/label; Sample code/label 2; Sample comment; Silicon dioxide; Silicon dioxide, standard deviation; Sodium oxide; Sodium oxide, standard deviation; Temperature, technical; Titanium dioxide; Titanium dioxide, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 1321 data points
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  • 7
    Publication Date: 2024-01-09
    Keywords: 153-923A; Atterberg settling tubes; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Fugacity of hydrogen gas; Internally heated pressure vessel (IHPV); Joides Resolution; Leg153; Melt fraction; Minerals; Ocean Drilling Program; ODP; Sample code/label; Sample code/label 2; Sample comment; South Atlantic Ocean; Temperature, technical; Time in hours; xH2O fluid phase
    Type: Dataset
    Format: text/tab-separated-values, 73 data points
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  • 8
    Publication Date: 2024-01-09
    Keywords: 153-923A; Aluminium oxide; Aluminium oxide, standard deviation; Anorthite; Calcium oxide; Calcium oxide, standard deviation; Comment; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Electron microprobe (EMP); Energy dispersive X-ray analysis, EDAX; Forsterite; Iron oxide, FeO; Iron oxide, FeO, standard deviation; Joides Resolution; Leg153; Magnesium number; Magnesium oxide; Magnesium oxide, standard deviation; Manganese oxide; Manganese oxide, standard deviation; Minerals; Number of observations; Ocean Drilling Program; ODP; Phosphorus pentoxide; Phosphorus pentoxide, standard deviation; Potassium oxide; Potassium oxide, standard deviation; Sample code/label; Sample code/label 2; Silicon dioxide; Silicon dioxide, standard deviation; Sodium oxide; Sodium oxide, standard deviation; South Atlantic Ocean; Temperature, technical; Titanium dioxide; Titanium dioxide, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 516 data points
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  • 9
    Publication Date: 2005-06-01
    Print ISSN: 0954-4879
    Electronic ISSN: 1365-3121
    Topics: Geosciences
    Published by Wiley
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  • 10
    Publication Date: 2019-03-13
    Electronic ISSN: 2045-2322
    Topics: Natural Sciences in General
    Published by Springer Nature
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