| 广西拉么Zn—Cu矿床中夕卡岩的主要矿物特点与Ca—Fe—Si—C—O体系T—lgfO2图解 |
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| 引用本文： | 赵劲松.广西拉么Zn—Cu矿床中夕卡岩的主要矿物特点与Ca—Fe—Si—C—O体系T—lgfO2图解[J].矿物学报,1989,9(2):154-164. |
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| 作者姓名： | 赵劲松 |
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| 作者单位： | 中国科学院地球化学研究所 贵阳 |
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| 摘 要： | 用电子探针数据研究了该矿床中主要夕卡岩矿物特点及其变化规律。采用理想结晶溶液固溶体位置混合模式,计算了石榴子石和辉石矿物对中钙铁榴石和钙铁辉石的摩尔分数。在计算纯固相和流体相参加的反应抵达平衡时的边界方程中,加上理想结晶固溶体中端元组分摩尔分数的修正项后,我们便可以计算出有纯固相、流体相和理想结晶溶液固溶体参加反应的在给定T、P条件下的lgfo_2值。计算结果表明:无变度点4周围的Hed+And+Wol组合对本矿区具有重要的地质地球化学意义。
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| 关 键 词： | 锌 铜 金属矿 夕卡岩 矿物 |
CHARACTERISTICS OF MAIN SKARN MINERALS AND T-lgfo_2 PHASE DIAGRAM OF THE SYSTEM Ca-Fe-Si-C-O IN LAMO SKARN Zn-Cu DEPOSIT,GUANGXI,CHINA |
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| Zhao Jinsong.CHARACTERISTICS OF MAIN SKARN MINERALS AND T-lgfo_2 PHASE DIAGRAM OF THE SYSTEM Ca-Fe-Si-C-O IN LAMO SKARN Zn-Cu DEPOSIT,GUANGXI,CHINA[J].Acta Mineralogica Sinica,1989,9(2):154-164. |
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| Authors: | Zhao Jinsong |
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| Abstract: | The compositions of more than 24 garnets and pyroxenes from the Lamo skarn deposit have been studied by means of electron mlcroprobe. It is found that garnets and pyroxenes are highly variable in composition. The majority of garnets are andradite-grossular solid solutions containing less than 12 mol% spessartine+almandine+pyrope, while the majority of pyroxenes are hedenbergite-diopside solid solutions containing less than 12 mol% johannesenite.The varues of Gibb's free energy of formation for garnets and pyroxenes differing in composition at different temperatures have been also obtained through thermodynamic calculation. The mole fractions of andradite and hedenbergite for coexisting pyroxene and garnet pairs have been calculated using the model of ionic occupancy mixing of ideal crystalline solid solution. when the mole fraction of an end-member component in ideal crystalline solid solutions is substituted into the formula of reaction in which pure solid phase and fluid phase have reache dequilibrium, the lgfo_2 values for reactions in which an equilibrium has been established between pure phase fluid phase and solid solution can be calculated at different temperatures under constant pressure. |
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| Keywords: | garnet pyroxene mole fraction oxygen fugacity skarn deposit |
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