The Amphibole in ultramafic rocks from southern Mariana trench inner slope: Implication for metasomatism in forearc setting

DONG Yan-hui; CHU Feng-you; ZHU Ji-hao; ZHANG Pin-pin

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DONG Yan-hui, CHU Feng-you, ZHU Ji-hao, ZHANG Pin-pin. The Amphibole in ultramafic rocks from southern Mariana trench inner slope: Implication for metasomatism in forearc setting[J]. Haiyang Xuebao, 2011, 33(5): 91-96.

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The Amphibole in ultramafic rocks from southern Mariana trench inner slope: Implication for metasomatism in forearc setting

Key Laboratory of Submarine Geosciences, State Oceanic Administrtion, Hangzhou 310012,China;The Second Institute of Oceanography, State Oceanic Administrtion, Hangzhou 310012,China

Received Date: 2009-12-30

Abstract

Abstract

The peridotites in landward-slope of Mariana trench regarded as the analogue of ophiolites, record the metasomatism between subducting slab fluid and subarc mantle wedge. Amphiboles is a product of the metasomatism. Our EPMA data suggest that the amphiboles in south Mariana trench inner-slope mainly tremolite and magnesiohornblende with little edenite.Magnesiohornblende have lower Mg^# and significantly high Na₂O and Al₂O₃ related to tremolite. The component of amphibole expectially magnesiohornblende suggests the matasomatic fluid contain high Si, Ca, Al, Na but extremely low Ti. The component difference between tremolite and magnesiohornblende might be attributed to fluid origin from difference depth. Fluid from relative shallow may be rich in Si and Ca but dilute Al and Na, and the fluid which formed magnesiohornblende may be origin from deeper slab which release more Al and Na.
- Mariana trench,
- Peridotite,
- Sub-arc mantle metasomatism,
- Amphibole,
- subduction factory

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References(21)

References

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