马里亚纳南部弧内坡橄榄岩的岩石学及地球化学特征: 对弧前地幔流体交代作用的指示*

doi:10.11978/j.issn.1009-5470.2012.03.016

Abstract

Abstract: The peridotites beneath arc outcrop at the inner slop of the Mariana Trench because of subduction erosion, which provides us a window to see the geological process in mantle wedge. In this paper, mineral composition, major elements, and trace element data of the peridotites dragged from southern Mariana Trench inner slope are reported to discuss petrogeness and fluid/rock interaction. High Mg of olivine, extremely low Al2O3 of orthopyroxene, and high Cr of spinel indicate the peridotites are refractory. Hydrous minerals in the peridotites such as Talc, amphibole (mainly tremolite with a little magnesiohornblende and edenite) and serpentine indicate fluid that might be rich in SiO2, Na2O and Al2O3 interacting with the refractory peridotites in mantle wedge. Whole rocks contain low concentration of CaO and Al2O3 and high MgO (~43% calculate to anhydrous system) coincidence with refractory nature revealed by mineral composition. The relative enrichment of U and Sr might reflect the chemical characteristics of the fluid released from the subducting slab at shallow depth.

Key words: Mariana, peridotite, subduction zone, forearc mantle metasomatism

CLC Number:

P736.32

DONG Yan-hui, CHU Feng-you, ZHU Ji-hao, YU Xing. Petrology and geochemistry of peridotite dredged from inner slope of Southern Mariana Trench: implication for mantle fluid metasomatism in the forearc setting[J].Journal of Tropical Oceanography, 2012, 31(3): 120-127.

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Petrology and geochemistry of peridotite dredged from inner slope of Southern Mariana Trench: implication for mantle fluid metasomatism in the forearc setting

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