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  • PANGAEA  (7)
  • Elsevier  (3)
  • Blackwell Science Ltd  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Hydrous partial melting within the lower oceanic crust (2005)
    Oxford, UK : Blackwell Science Ltd
    Terra nova 17 (2005), S. 0 
    Details
    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
    URL: http://dx.doi.org/10.1111/j.1365-3121.2005.00613.x
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    Paper (German National Licenses)
    Fulltext
  • 2
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    (Table 1) Chemical composition of gabbros from ODP Hole 176-735B (2004)
    PANGAEA
    Details
    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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    DATA PANGAEA
  • 3
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    (Table 1) Chemical composition of gabbros from ODP Hole 153-923A (2004)
    PANGAEA
    Details
    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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    DATA PANGAEA
  • 4
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    (Table 2) Partial melting experiments of gabbros from ODP Hole 176-735B (2004)
    PANGAEA
    Details
    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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  • 5
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    (Table 3) Composition of the experimental phases and of minerals of gabbros from ODP Hole 176-735B (2004)
    PANGAEA
    Details
    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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    DATA PANGAEA
  • 6
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    (Table 2) Partial melting experiments of gabbros from ODP Hole 153-923A (2004)
    PANGAEA
    Details
    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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  • 7
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    (Table 3) Composition of the experimental phases and of minerals of gabbros from ODP Hole 153-923A (2004)
    PANGAEA
    Details
    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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    DATA PANGAEA
  • 8
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    Partial melting experiments on oceanic cumulated gabbros (2004)
    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
    Details
    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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    DATA PANGAEA
  • 9
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    The Dovyren Intrusive Complex (Southern Siberia, Russia): Insights into dynamics of an open magma chamber with implications for parental magma origin, composition, and Cu-Ni-PGE fertility (2018)
    Elsevier
    Details
    Publication Date: 2018-03-01
    Print ISSN: 0024-4937
    Electronic ISSN: 1872-6143
    Topics: Geosciences
    Published by Elsevier
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  • 10
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    Subduction initiation terranes exposed at the front of a 2 Ma volcanically-active subduction zone (2019)
    Elsevier
    Details
    Publication Date: 2019-02-01
    Description: The development of ideas leading to a greater understanding of subduction initiation is limited by the scarcity of present-day examples. Furthermore, the few examples identified so far unfortunately provide few insights into the nature of magmatism at the inception of subduction. Here we report new observations from the Matthew and Hunter (M&H) subduction zone, a very young subduction zone located in the South-West Pacific. Tectonics of the area show it is younger than 2 Ma, making the M&H the youngest known volcanically-active subduction system and hence providing unique insights into the earliest stages of subduction initiation. Volcanism in this area comprises an exceptionally diverse range of contemporaneously erupting magma compositions which are spatially juxtaposed. Pb isotopic compositions and abundance of LILE and REE strongly suggest melting of upwelling asthenospheric mantle (Indian MORB) and subducted oceanic crust (Pacific MORB of the South Fiji Basin) and the mixing of these two components. Volcanism occurs much closer to the trench compared to volcanism in more mature subduction zones. We demonstrate that the M&H subduction zone is a modern example of an immature subduction system at the stage of pre-arc, near-trench magmatism. It is not yet building an arc but what we propose to call a Subduction Initiation Terrane (SITER). Today, the proto-forearc of the M&H subduction zone is a collage of these SITERs, coeval back-arc domains and remnants of pre-existing terranes including old Vitiaz Arc crust. The M&H area represents a modern analog of a Supra Subduction Zone setting where potentially a majority of ophiolites have formed their crustal and lithospheric components. Present-day magmatism in the M&H area therefore provides clues to understanding unforeseen distribution of contrasted magmatic rock types in fossil forearcs, whether they are at the front of mature subduction zones or in ophiolites.
    Print ISSN: 0012-821X
    Electronic ISSN: 1385-013X
    Topics: Geosciences , Physics
    Published by Elsevier
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