科研之友
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摘要
Arc magmatism distinguishes itself from magmatism in other tectonic settings by the crucial role that water plays in its petrogenesis Water influences the geochemistry of the sub-arc mantle, by transferring fluid-soluble elements from the slab into the mantle Water probably also carries the oxidised signature from the slab into the mantle wedge The ubiquitous negative Ti-anomaly in arc magmas may reflect an increase of the compatibility of titanium in the solid residue during partial melting in water-bearing peridotite Finally, water also has a strong influence on the identity of minerals involved in crystal fractionation processes, and gives rise to the low-Fe (calc-alkaline) fractionation trend by lowering the temperature at which the silicates start crystallising, without influencing the crystallisation temperature of iron-oxides
- 出版日期2010-7
