MESOZOIC-CENOZOIC TECTONIC MAGMATIC PORTFOLIO ANALYSIS IN CUOQIN AREA OF THE MIDDLE GANGDISE

JIANG Yuan-sheng; XU Tian-de; ZHAO You-nian

Volume 15 Issue 4

Dec. 2009

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JIANG Yuan-sheng, XU Tian-de, ZHAO You-nian, 2009. MESOZOIC-CENOZOIC TECTONIC MAGMATIC PORTFOLIO ANALYSIS IN CUOQIN AREA OF THE MIDDLE GANGDISE. Journal of Geomechanics, 15 (4): 336-348.

Citation:

JIANG Yuan-sheng, XU Tian-de, ZHAO You-nian, 2009. MESOZOIC-CENOZOIC TECTONIC MAGMATIC PORTFOLIO ANALYSIS IN CUOQIN AREA OF THE MIDDLE GANGDISE. Journal of Geomechanics, 15 (4): 336-348.

Citation:

JIANG Yuan-sheng, XU Tian-de, ZHAO You-nian, 2009. MESOZOIC-CENOZOIC TECTONIC MAGMATIC PORTFOLIO ANALYSIS IN CUOQIN AREA OF THE MIDDLE GANGDISE. Journal of Geomechanics, 15 (4): 336-348.

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MESOZOIC-CENOZOIC TECTONIC MAGMATIC PORTFOLIO ANALYSIS IN CUOQIN AREA OF THE MIDDLE GANGDISE

Regional Geological Surveying Team, SGEEMRSP, Chengdu 610213, China

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Received: 2009-06-19
Published: 2009-12-01

Abstract

Abstract

On the basis of 1:250000 regional geological mapping in the blank areas of the Qinghai-Tibet Plateau, the magmatic rocks in Cuoqin area are divided into six kinds of petrotectonic assemblage through their time-spatial distribution, occurrence, petrology, geochemistry and tectonic settings as follows: (1) the combination of inter-arc dilated, (2) the Oceanic-island ophiolite portfolio, (3) the portfolio of island and margin arcs, (4) the combination of collision-type, (5) the inland subduction and collision-type combination, and (6) the intracontinental extensional type combination. Then, the geodynamic mechanism of tectono-magmatic portfolios, especially the mid-Himalayan magmatism, is discussed. It is proposed that the Gangdise tectono-magmatic belt is comprised by the subduction-, collision- and uplift-type magmatic rocks clearly zoned in space and evolution from base to acidic in time.
- petrotectonic assemblage,
- Gangdise tectono-magmatic belt,
- Mesozoic and Cenozoic,
- Cuoqin,
- Tibet

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References(20)

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