| 宁镇中段岩浆带杂岩体的斜长石矿物学研究 |
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| 引用本文： | 张术根,徐莺,余旭辉. 宁镇中段岩浆带杂岩体的斜长石矿物学研究[J]. 矿物岩石, 2010, 30(3) |
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| 作者姓名： | 张术根 徐莺 余旭辉 |
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| 作者单位： | 中南大学地学与环境工程学院,湖南,长沙,410083 |
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| 基金项目： | 江苏省财政补助地勘项目 |
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| 摘 要： | 运用光学显微镜、X射线衍射分析、扫描电镜微区能谱分析等手段,宁镇中段岩浆岩带安基山、伏牛山、西银坑、洪水宕、铜山、下蜀等杂岩体的斜长石斑晶的某些成因矿物学特点及其与岩浆演化分异特征的关系进行研究。结果表明:研究区中酸性岩体的斜长石主要为更-拉长石,韵律环带发育,形成经历了5个形成阶段,具有两种类型:一是核心为基性斜长石的正-反环带交互生长的斜长石;二是核心为中性斜长石的反-正环带交互发育的斜长石。研究还表明,斜长石各形成经历阶段、特别是晚期环境变化越和缓,岩浆分异程度越高。与其他各岩体相比较,西银坑、铜山岩体斜长石牌号明显偏高,反环带最发育,反映其岩浆同化混染更显著,而西银坑岩体岩浆结晶全程温度、K,Na,Ca组分相对活度波动频率更高,幅度更大。结合各岩体全岩及斜长石斑晶的成矿元素含量分析(Cu,Pb,Zn),认为岩浆结晶晚期分异充分,温度和K,Na,Ca组分相对活度波动和缓的铜山、安基山、伏牛山岩体是区内Cu多金属找矿的主要目标岩体。
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| 关 键 词： | 宁镇中段岩浆带 杂岩体 斜长石 结晶分异 韵律环带 |
RESEARCH ON THE MINERALOGY OF PLAGIOCLASE FROM THE MAGMATIC COMPLEX IN THE MIDDLE SEGMENT OF NANJING-ZHENJIANG MESOZOIC MAGMATIC BELT |
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| ZHANG Shu-gen,XU Ying,YU Xu-hui. RESEARCH ON THE MINERALOGY OF PLAGIOCLASE FROM THE MAGMATIC COMPLEX IN THE MIDDLE SEGMENT OF NANJING-ZHENJIANG MESOZOIC MAGMATIC BELT[J]. Journal of Mineralogy and Petrology, 2010, 30(3) |
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| Authors: | ZHANG Shu-gen XU Ying YU Xu-hui |
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| Affiliation: | ZHANG Shu-gen,XU Ying,YU Xu-hui(School of Geosciences and Environmental Engineering,Central South University,Changsha 410083,China) |
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| Abstract: | The metallogenic intensity and scale of skarn-type copper deposit in the middle segment of Nanjing-Zhenjiang is influenced by Yanshanian intermediate-acidic instrusive differentiation evolution.As the growth of plagioclase is conducted during the whole crystallization process of magma,the differentiation evolution characteristics of magmatic process can be revealed by study on the genetic mineralogical properties of plagioclase.Based on comprehensive research on geology,geophysics,geochemistry and remote se... |
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| Keywords: | middle segment of Nanjing-Zhenjiang Mesozoic magmatic belt complex intrusive plagioclase crystallization differentiation oscillatory zoning |
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