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GEOCHEMISTRY AND TECTONIC SETTING OF OPHIOLITES IN WEST OF NAMCO LAKE, TIBET

Yang Xin-de

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Abstract

Ophiolites in west of the Namco Lake in Tibet are mainly composed of metamorphic peridotites, gabbro-diabases and basalts. From the analysis of major and trace elements of ophiolite in west of Namco, the characteristics of the metamorphic peridotite are high content in Mg, and low content in Ti and ∑REE. The diabases and basalts are the transitional IAB / MORB - type basalt, which have the characteristic of depletion in high field elements (Nb, Ta, Zr, Hf) and comparable enrichment in large ion lithosperic elements (Rb, Sr, Ba), and on the other hand, the REE/chondrite pattern displays a flat-model with LREE depletion and without Eu anomaly. It is concluded that the geotectonic setting of ophiolite in Namco is formed in back arc basin by the comparison with the ophiolite of typical areas and discrimination diagrams of the tectonic setting.

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What this paper is about

Ophiolites in west of the Namco Lake in Tibet are mainly composed of metamorphic peridotites, gabbro-diabases and basalts. From the analysis of major and trace elements of ophiolite in west of Namco, the characteristics of the metamorphic peridotite are high content in Mg, and low content in Ti and ∑REE. The diabases and basalts are the transitional IAB / MORB - type basalt, which have the characteristic of depletion in high field elements (Nb, Ta, Zr, Hf) and comparable enrichment in large ion lithosperic elements (Rb, Sr, Ba), and on the other hand, the REE/chondrite pattern displays a flat-model with LREE depletion and without Eu anomaly. It is concluded that the geotectonic setting of ophiolite in Namco is formed in back arc basin by the comparison with the ophiolite of typical areas and discrimination diagrams of the tectonic setting.

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Available abstract

Ophiolites in west of the Namco Lake in Tibet are mainly composed of metamorphic peridotites, gabbro-diabases and basalts. From the analysis of major and trace elements of ophiolite in west of Namco, the characteristics of the metamorphic peridotite are high content in Mg, and low content in Ti and ∑REE. The diabases and basalts are the transitional IAB / MORB - type basalt, which have the characteristic of depletion in high field elements (Nb, Ta, Zr, Hf) and comparable enrichment in large ion lithosperic elements (Rb, Sr, Ba), and on the other hand, the REE/chondrite pattern displays a flat-model with LREE depletion and without Eu anomaly. It is concluded that the geotectonic setting of ophiolite in Namco is formed in back arc basin by the comparison with the ophiolite of typical areas and discrimination diagrams of the tectonic setting.

Key concepts: Ophiolite, Geochemistry, Geology, Peridotite, Basalt, Gabbro, Metamorphic rock, Partial melting

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