西藏同卡地区高压麻粒岩的发现、PT轨迹及其大地构造意义

收稿日期: 2010-03-01

修回日期: 2010-05-18

刊出日期: 2010-06-30

Discovery and P-T path of high-pressure granulite in Tongka area of Tibet and its tectonic significance

Received Date: 01 March 2010

Revised Date: 18 May 2010

Publish Date: 30 June 2010

摘要: 在班公湖-怒江缝合带的同卡地区发现了高压麻粒岩，它经历了至少两期变质作用，即高压麻粒岩相和退变质角闪岩相变质作用。峰期高压麻粒岩相矿物组合为：石榴石-单斜辉石-斜长石，退变质角闪岩相矿物组合：角闪石-斜长石。地质温压计的计算结果表明高压麻粒岩相的温压条件为600~750℃，11.0~13.0kb；退变质角闪岩相的温压条件为500~600℃，6.0kb左右，高压麻粒岩具有顺时针退变质的P-T轨迹特点。
- 同卡地区 /
- 班公湖-怒江结合缝合带 /
- 麻粒岩 /
- P-T轨迹
Abstract: The high-pressure granulite discovered in Tongka area of Bangong Co-Nujiang suture zone in Tibeten Plateau, went through at least two stage metamorphisms of high-pressure granulite phase and retrogressive-metamorphic amphibolite phase. Mineral assemblages of the high-pressure granulite phase in the peak stage were garnet-clinopyroxene-plagioclase while mineral assemblages of retrogressive-metamorphic amphibolite phase were amphibolite-plagioclase. Geological temperature-pressure indicator showed that the temperature-pressure conditions of high-pressure granulite phase were 600~750℃, 11.0~13.0kb, while that of retrogressive-metamorphic amphibolite phase were 500~600℃, 6.0kb and so the high-pressure granulite was of clockwise retrogersive-metamorphic P-T path characteristic.
- Tongka area /
- Bangong Co-Nujiang suture zone /
- granulite /
- P-T path

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