| 一种新的地质压力计——单斜辉石-石英-斜长石-钠钙质角闪石地质压力计 |
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| 引用本文： | 王朴,刘嵘,王国灿.一种新的地质压力计——单斜辉石-石英-斜长石-钠钙质角闪石地质压力计[J].地质科技情报,2007,26(1):28-32. |
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| 作者姓名： | 王朴 刘嵘 王国灿 |
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| 作者单位： | 1. 中国地质大学,研究生院,武汉,430074
2. 中国地质大学,地球科学学院,武汉,430074 |
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| 基金项目： | 中国地质大学(武汉)地质学理科基地专项基金 |
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| 摘 要： | 根据超高压岩石的退变质反应20Jd 3Di H2O=12Ab 2An Tar 3Na2O和18Jd 3Di 2Aeg H2O=12Ab 2An Fe-Tar 3Na2O,利用拟合的绿闪石和铁质绿闪石的热力学数据,在平衡热力学原理的基础上,建立了两个反应的压力计表达式:p=0.001 6(t 273)-0.028lnK 0.321K = (aPlNaAlSi3O8)12·(aPlCaAl2Si2O8)2·(aTarNa2CaMg3Al2Si6Al2O22](OH)2·(aSodNa2O)3/aNCpxNaAlSi2O6)20·(aCpxCaMgSi2O6)3·aWatH2O经中国安徽省潜山县双河和西阿尔卑斯高压超高压变质带的验证及与角闪石-斜长石温度计的对比,其计算结果基本合理,表明这一新的压力计具有较好的应用价值.
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| 关 键 词： | Cpx-Q-Pl-Tar压力计 硬玉石英岩 冠状体 结构拟合法 |
| 文章编号： | 1000-7849(2007)01-0028-05 |
| 修稿时间： | 2006-04-02 |
A New Geobarometer Established on Coexisting Clinopyroxene-Quartz-Plagioglase-Taramite Assemblage |
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| WANG Pu,LIU Rong,WANG Guo-can.A New Geobarometer Established on Coexisting Clinopyroxene-Quartz-Plagioglase-Taramite Assemblage[J].Geological Science and Technology Information,2007,26(1):28-32. |
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| Authors: | WANG Pu LIU Rong WANG Guo-can |
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| Institution: | 1. Graduate School ; 2. Faculty of Earth Sciences ,China University of Geosciences , Wuhan 430074, China |
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| Abstract: | A new geobarometer is established on the two reactions: 20Jd+3Di+H_(2)O=12Ab+2An+Tar+3Na_(2)O and 18Jd+3Di+2Aeg+H_(2)O=12Ab+2An+Fe-Tar+3Na_(2)O,which are designed from the corona developing in Jadeite-Quartzite.According to the method of structural estimation,the problem that a series of minerals do not have published experimental thermodynamic properties is solved.The geobarometric formulae for the mineralogic assemblage are presented as well.By comparing the ultrahigh pressure zones between Shuanghe in Qianshan and Western Alps using Am-Pl geothermometer and the present geobarometer,the new geobarometer is of potential application. |
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| Keywords: | Cpx-Q-PI-Tar geobarometer Jadeite-Quartzite corona structural estimation |
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