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[1]胡能高,王锐,王晓霞,等.柴北缘塔塔楞环斑花岗岩的 矿物学特征及岩石学意义[J].地球科学与环境学报,2008,30(04):337-345.
 HU Neng-gao,WANG Rui,WANG Xiao-xia,et al.Mineralogical Characteristics and Petrological Significance of the Tataleng Rapakivi Granite in the Northern Margin of Qaidam Basin[J].Journal of Earth Sciences and Environment,2008,30(04):337-345.
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柴北缘塔塔楞环斑花岗岩的 矿物学特征及岩石学意义(PDF)
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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:
第30卷
期数:
2008年第04期
页码:
337-345
栏目:
基础地质与矿产地质
出版日期:
2008-12-20

文章信息/Info

Title:
Mineralogical Characteristics and Petrological Significance of the Tataleng Rapakivi Granite in the Northern Margin of Qaidam Basin
作者:
胡能高1王锐2王晓霞3孙延贵4林伟1申文环5
1.长安大学地球科学与资源学院,陕西西安710054;2.西北有色地质勘查局712总队,陕西咸阳712000; 3.中国地质调查局发展研究中心,北京100037;4.青海省地质调查院,青海西宁810012; 5.山东省化工地质勘察院,山东济南250013
Author(s):
HU Neng-gao1WANG Rui2WANG Xiao-xia3SUN Yan-gui4LIN Wei1SHEN Wen-huan5
1.School o f Earth Sciences and Resource, Changan University, Xian 710054, Shaanxi, China; 2.Northwest Mining and Geological Exploration Bureau for Non ferrous Metals, 712 Team, Xianyang 712000, Shaanxi, China; 3.Development and Research Center o f China Geologic Survey Bureau, Beijing 100073, China; 4.The Geologic Survey Department o f Qinghai Province, Xining 810012, Qinghai, China; 5.The Chemical Geological Survey Academy o f Shandong Province, Jinan 250013, Shandong, China)
关键词:
柴北缘构造带塔塔楞岩体环斑花岗岩A型花岗岩黑云母钾长石
Keywords:
northern margin of Qaidam basin Tataleng intrusions rapakivi granite A-type granite biotite K- feldspar
分类号:
P588.1
DOI:
-
文献标志码:
A
摘要:
通过对塔塔楞环斑花岗岩主要矿物结构及成分研究表明,岩体结晶经历了下列几个阶段:最早结晶的矿 物为斜长石、黑云母和石英,随后为钾长石球斑的主要结晶期,紧接着有球斑的环边生长和中粗粒基质形成,最 后结晶产物为分布在中粗粒基质间隙的细粒基质。黑云母都是富铁的,从早期到晚期富铁程度增加, w(TFeO)/w(TFeO+MgO)从0.80增加到0.96。钾长石广泛发育出溶钠长石条纹,推算出的球斑钾长石、中粗 粒基质和细粒基质钾长石的平均成分分别为Or69.61Ab29.59An0.80、Or71.50Ab27.94An0.56、Or72.63Ab26.47An0.90。球 斑内斜长石的An为25.98~29.41,中粗粒基质的An为23.85~27.48,而细粒中的An为11.94,主要矿物特征 与经典环斑花岗岩一致,而矿物成分的变异显示岩体形成过程中发生了有效的结晶分异。
Abstract:
Petrographic observations and analyses for dominant minerals indicate that the Tataleng rapakivi granite experienced several stages of crystallization. The earliest stage is the crystallization of plagioclase biotite and quartz. The second stage is the main crystallization stage of the rounded K-feldspar phenocrysts. At the third stage, the crystallization of medium-to coarse-grained matrix minerals is accompanied by the growth of zoned rim of rounded phenocryst. The fine-grained matrix minerals, which distributed in the interstices of the coarser matrix minerals, are the results of the last stage. Biotite at different stages are always rich in iron, and the w(TFeO)/ w(TFeO+ MgO)ratios increase from 0.80 to 0.96 from the earliest stage to the last stage. Exsolved albite lamellas widely distributed in K-feldspars, and the calculated average compositions for rounded phenocrysts, medium-to coarse-grained and fine-grained K-feldspars are Or69. 61Ab29. 59An0. 80, Or71. 50Ab27. 94An0. 56 and Or72. 63Ab26. 47An0. 90, respectively. The An values of plagioclase included in the rounded phenocrysts, medium- to coarse-grained matrix and fine-grained matrix are 25. 98 to 29. 41, 23. 85 to 27. 48 and 11. 94, respectively. The characteristics of dominant minerals are identical with classic rapakivi granite, while the variations in mineral compositions testified an efficient process of crystallization differentiation.

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相似文献/References:

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 U Neng-gao,SHEN Wen-huan,WANG Xiao-xia,et al.Petrography Feature of Yingfeng Rapakivi Granite Body in North Margin of Qaidam Basin[J].Journal of Earth Sciences and Environment,2006,28(04):1.

备注/Memo

备注/Memo:
收稿日期:2008-05-28
基金项目:国家自然科学基金项目(40372043)
作者简介:胡能高(1949-),男,浙江东阳人,教授,从事岩石学和地球化学教学与研究。E-mail:nenggaoh@chd.edu.cn
更新日期/Last Update: 2008-12-20