Seawater-derived rare earth element addition to abyssal peridotites during serpentinization
نویسندگان
چکیده
منابع مشابه
Quantifying trace element disequilibria in mantle xenoliths and abyssal peridotites
We apply a tool based on element distribution between orthopyroxene and clinopyroxene for quantifying rare earth element (REE) disequilibria in ultramafic rocks in the subsolidus state. We present case studies of the REE contents of mineral cores in mantle xenoliths and abyssal peridotites using in situ analytical tools. Even when only mineral cores are measured (to avoid enriched rims), equili...
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Serpentinized oceanic lithosphere may be an important source for boron and other fluid-mobile elements that are anomalously enriched in arc volcanic rocks. However, the integrated water/rock ratios associated with different styles of serpentinization may be variable. For example, large water/rock ratios are involved in the serpentinization of abyssal peridotites exhumed to the seafloor, whereas...
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Terrestrial oceanic and continental basalts are enriched by approximately þ0.1% in Fe/Fe ratio relative to primitive, undifferentiated meteorites (chondrites). The dFe values of terrestrial basalts are also distinct from those of basalts from Mars and asteroid Vesta, which have chondritic Fe isotopic compositions. The processes responsible for the isotopic enrichment of terrestrial basalts are ...
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The petrology and geochemistry of serpentinized harzburgites within the Feather River Ophiolite in northern California were investigated to constrain the origin of serpentinization. Trace-element systematics indicate that serpentinization was associated almost solely with relatively low temperature hydrothermal addition of seawater and not with the addition of metamorphic fluids associated with...
متن کاملEffect of the Addition of Rare Earth Element La on the Tribological Behaviour of AlSi5Cu1Mg Alloy
The effects of 0, 0.3, 0.6 and 0.9 wt % modifier La on the dry sliding wear behaviours of AlSi5Cu1Mg alloy were investigated under different friction conditions (normal loads, sliding velocities) by using pin-on-disc configuration. The microhardness of the alloys was tested, and it was found that the microhardness of the alloys was improved by the La addition. The AlSi5Cu1Mg + 0.6 wt % La alloy...
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ژورنال
عنوان ژورنال: Lithos
سال: 2016
ISSN: 0024-4937
DOI: 10.1016/j.lithos.2016.01.025