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Petrogenesis of songshugou dunite body in the Qin{1.ng orogenic belt, Central{2.: Constraints from geochemistry and melt inclusions

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Science china Earth Sciences 2005年第8期48卷 1146-1157页

作者： su li1,2. song shuguang3.& zhou dingwu1 1. key laboratory of continental dynamics of the ministry of education, {2. of Geology, northwestern university, xi’an 710069, china 2. The Geological Lab Center, china university of Geosciences (Beijing), Beijing 100083, china 3. key laboratory of Orogenic Belts of the ministry of {12., {2. of Geology, Peking university, Beijing 100871, china key {1. of {2. dynamics of the ministry of education Department of Geology Northwestern University Xi’an China The Geological Lab Center China University of Geosciences (Beijing)Beijing China key {1. of Orogenic Belts of the {2. of education Department of Geology Peking University Beijing China

The songshugou dunite body, which occupies an area of about {1. km{1. is the largest ultramafic massif in the eastern Qinling orogenic belt, Central{{1.. The major compo-nent of this body is dunitic rocks including my... 详细信息

The songshugou dunite body, which occupies an area of about 2. km2. is the largest ultramafic massif in the eastern Qinling orogenic belt, Central{2.. The major compo-nent of this body is dunitic rocks including mylonitic dunite and coarse-grained dunite; they oc-cupy about 95 vol% of the total body. Petrography, mineral composition, major and trace ele-ments and primitive melt inclusions have been investigated in this paper; all revealed that this dunite body is the product of melt-rock interaction by porous percolation flow. In comparison with dunite sills or veins in harzburgite from the basal part of Oman ophiolite, this dunite body is characterized by lower contents of Al2.3, CaO and HREE but higher content of highly incom-patible elements and Zr and Hf. The LREE enriched patterns and primitive mantle normalized spidergrams of trace elements are also different from the Oman dunite. Combining with melt in-clusions observed in olivines, we conclude that this dunite body is the product of large- scale porous percolation flow of high-MgO melts within depleted mantle peridotites. The high-MgO magma, in essence, was most probably produced at the hot head of an upwelling mantle plume. The occurrence of the songshugou dunite body is closely associated with the activity of mantle super-plume in Neo-Proterozoic era in the Yangtze Craton.

关键词： songshugou dunite body, geochemistry, melt inclusion, mantle plume, Qinling orogenic belt.

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