| 青藏高原北缘火山岩中辉石岩包体研究 |
| 修订日期：2000-11-20 点此下载全文 |
| 引用本文：吴才来,杨经绥,李海兵,史仁灯,孟繁聪.2001.青藏高原北缘火山岩中辉石岩包体研究[J].地球学报,22(1):61-66. |
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| 基金项目:国家重点基础研究发展规划项目(G199804800)，国家自然科学基金(49732070) |
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| 中文摘要:青藏高原北缘可可西里鲸鱼湖、雄鹰台、双泉子火山岩中含有辉石岩包体 ,其主要矿物组成为单斜辉石和斜方辉石。辉石的化学成分与国内外幔源包体 -橄榄岩和辉石岩中的类似 ,与麻粒岩中的明显不同 ;辉石温压计计算结果表明 ,辉石形成的温度为 110 1～ 140 0℃ ,压力为 30× 10 8～ 6 0× 10 8Pa,结合岩浆动力学计算结果 ,推测岩浆的来源深度大于 15 0km ,这与地球物理研究得出本区地下深处存在低速层的结果相吻合。 |
| 中文关键词:辉石岩包体 矿物化学 可可西里 |
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| Pyroxenite Xenolith in the Volcanic Rocks from North Tibet |
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| Abstract:The pyroxenite xenolith in the volcanic rocks from Hohxil, north Tibet, consists of clinopyroxenes and othopyroxenes. Mineral chemically these pyroxenes are similar to mantle enclaves including peridotite and pyroxenite from China and abroad, and different from ones of granulites. The temperatures and pressures of forming pyroxenes are in ranges of 1 101～1 400 ℃(averaged 1 250 ℃) and 30×108～60×108Pa(averaged 46×108Pa)based on the thermobarometer of Mercier(1980), respectively. Combined with magma dynamics we deduced that magma was derived from the mantle with the depth of more than 150 km, which is fit in with geophysical conclusion that showed the low-velocity zone existed in the mantle under 150 km. |
| keywords:pyroxenite enclaves mineral chemistry Hohxil |
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