| 大陆俯冲带的深部流体及变质化学地球动力学
——以苏鲁超高压变质带为例 |
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| 关键词:continental subduction zone supercritical fluid Na/Ta fractionation metamorphic chemical geodynamics |
| 基金项目:科技部973项目(2003CB716501)、国家自然科学基金项目(40399142和40472036)和中国地质调查局项目 |
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| Fluids from the Deeply Continental Subduction Zone and the Metamorphic Chemical Geodynamics |
| By the studies of petrology, mineral chemistry, geochemistry and geochronology of the ultrahigh- pressure metamorphic rocks from the Sulu orogenic belt, some important achievements related to the metamorphic chemical geodynamics in the convergent plate boundary have been reached. They include that the fluids in the deeply subducted continental crust are the high oxygen fugacity and silicate-rich supercritical fluids, the supercritical fluids-minerals (rocks) interactions under the extreme ultrahigh-pressure metamorphic condition have resulted in the mobility of normally fluid-immobile elements, and the highly fractionation between Nb and Ta, and that the voluminous ultrahigh-pressure eclogites subducted into the deep mantle have higher Nb/Ta values than that of the chondrite and are the complementary suprachondritic reservoir capable of balancing the subchondritic depleted mantle and continental crust reservoirs. |
| ZHANG Ze-ming,SHEN Kun.2009.Fluids from the Deeply Continental Subduction Zone and the Metamorphic Chemical Geodynamics[J].Acta Geoscientica Sinica,30(1):5-20. |
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