| 阿尔泰南缘中泥盆统北塔山组火山岩的矿物学研究 |
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| 引用本文： | 张贺,张招崇.阿尔泰南缘中泥盆统北塔山组火山岩的矿物学研究[J].矿物学报,2012,32(3):386-397. |
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| 作者姓名： | 张贺 张招崇 |
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| 作者单位： | 中国地质大学地质过程与矿产资源国家重点实验室,北京,100083 |
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| 基金项目： | 国家自然科学基金项目“阿尔泰山南缘泥盆纪苦橄岩及其对岛弧地幔源区的约束” |
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| 摘 要： | 阿尔泰山南缘中泥盆统北塔山组火山岩极为发育。本文对富辉橄玄岩和玄武岩中的单斜辉石和橄榄石斑晶进行了矿物化学分析,并结合矿物的地质温压计和岩浆结晶模拟,约束了两种岩石中矿物的形成过程,推测了原始岩浆的演化过程。提出富辉橄玄岩和玄武岩的原始岩浆属于拉斑玄武系列,富辉橄玄岩中的高压单斜辉石来源于深部（40～50 km）,其结晶早于橄榄石;玄武岩中单斜辉石大多属于岩浆房结晶产物（30～40km）,其结晶晚于橄榄石;两种岩石中橄榄石均属于岩浆房结晶产物（30～40 km）。
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| 关 键 词： | 阿尔泰 富辉橄玄岩 玄武岩 橄榄石 单斜辉石 矿物学 |
Mineralogical Studies on Volcanic Rocks of Middle Devonian Beitashan Formation,South Altay,China |
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| ZHANG He,ZHANG Zhao-chong.Mineralogical Studies on Volcanic Rocks of Middle Devonian Beitashan Formation,South Altay,China[J].Acta Mineralogica Sinica,2012,32(3):386-397. |
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| Authors: | ZHANG He ZHANG Zhao-chong |
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| Institution: | (State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences, Beijing 100083,China) |
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| Abstract: | Volcanic rocks are well developed in middle Devonian Beitashan Formation,South Altay,Xinjiang Province,China.In this study,we analyzed the chemical characteristics of clinopyroxene and olivine phenocrysts in ankaramites and basalts from Beitashan Formation.Based on mineral chemical analyses,combining with the geothermal data,geobarometry and simulation of magma crystallization,we inferred the evolution process of the primary magma.The primary magma of ankaramites and basalts belongs to tholeiite series.The high-pressure clinopyroxenes in ankaramites were from a deep level(40-50 km) and their crystallization happened before olivines.The low-pressure clinopyroxenes in basalts were from the magma chamber(30-40 km) and their crystallization happened after olivines.All olivines both in ankaramites and basalts were crystallized in the magma chamber(30-40 km). |
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| Keywords: | Altay ankaramites basalts olivine clinopyroxene mineralogy |
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