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Phase equilibria and thermodynamic properties of lower crustal and uppre mantle minerals.

下地壳和上地幔矿物的相平衡和热力学性质。

基本信息

批准号：
09640571
负责人：
KAWASAKI Toshisuke
金额：
$ 1.92万
依托单位：
Ehime University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

项目摘要

My research results are summarized as follows :1. Thermodynamic Properties of Olivine arid Clinopyroxene in the System CaO-FeO-MgO-SiO_2(a) Olivine behaves as the disordered two-site solution from the theoretical study on the thermodynamic properties of Ca-Fe-Mg divines (Mineral. 1., 20, 135-149, 1998).(b) Experiments on the Ca-Fe-Mg partitioning between olivine and chnopyroxene make it clear that the Fe-Mg distribution coefficient is highly dependent on CaO contents of olivine, and increases with increasing in Ca^<2+> and Fe/(Fe+Mg) in the system (Rev. High Pressure Sci. Tecnol., 7, 95-97, 1998).(c) Mixing propeties of clinopyroxene are approximated as time multi-site regular solution cooperating intracrystalline exchange equilibria (Geochem. J., 33, 33-58, 1999).(d) Experimental study on the solvus of Ca-Fe-Mg olivine shows that the ohivine is the two-site regular solution in which the Fe^<2+> and Mg^<2+> are radomly mixing although Ca^<2+> are strictly lucallized in M2 site of olivi … More ne (submitted to Am. Mineral.).2. Experimental Study of Phase Equilibria in the system FeO - MgO - A1_20_<>3 - SiO_2 from the Lower Crust to the Upper Mantle pressures.(a) Time Fe-Mg partitioning between orthopyroxene and cordierite shows that this reaction is sensitive for the variation of temnprature, and this would be a good geothermometer (Proc. NIPR Symp., Antarct. Geosci., 10, 150-159 1997).(b) The mineral assemblage of orthopyroxene+cordierite+spinel is unstable and changes into the olivine+cordierite+spinel at a certain temperature between 10000C and 102500 at 1 atm in the Mg_3Al_2Si_3O_<12> system (J.Japan. Assoc. Pet. Min. Econ. Geol., 93, 18-26, 1998).(c) high pressure experiments on the AI_2o_3 solubility in orthopyroxene in equi1ibium with in assemblages of spinel+quartz and sapphirine+quartz in time Mg_3AI_2Si_3O_<12> (pyrope composition) system shows the phase boundary of the univariant reaction : 2MgAI_20_4 (SpI) + Si0_2 (Qtz) = Mg_2Al_4Si0_<10> (Spr), locates within a certain pressure between 1.5 and 1.75 GPa at 1300ﾟC (prepareing to Contrib. Mineral. Petrol.). Less

我的研究成果总结如下：1。CaO-FeO-MgO-SiO_2体系中橄榄石和斜辉石的热力学性质(a)从Ca-Fe-Mg矿物热力学性质的理论研究来看，橄榄石表现为无序二元溶液。， 20, 135-149, 1998)。(b)橄榄石与辉石之间Ca-Fe-Mg分配实验表明，Fe-Mg分配系数高度依赖于橄榄石中CaO含量，并随着体系中Ca^<2+>和Fe/(Fe+Mg)的增加而增大（《高压科学》，Rev. High Pressure Sci.）。Tecnol。， 7, 95-97, 1998)。(c)斜辉石的混合性质近似为时间多点规则溶液配合晶内交换平衡（地球化学）。J., 33, 33-58, 1999)。(d)对Ca-Fe-Mg橄榄石溶液的实验研究表明，橄榄石是Fe^<2+>和Mg^<2+>随机混合的二元规则溶液，而Ca^<2+>在橄榄石的M2位点上严格限定。矿产)。2。FeO - MgO - A1_20_< bbb_3 - SiO_2体系下地壳到上地幔压力相平衡的实验研究(a)正辉石和堇青石之间的时间Fe-Mg分配表明该反应对温度变化敏感，这将是一个很好的地温计（Proc. NIPR Symp.）。, Antarct。Geosci。， 10, 150-159 1997年)。(b)在Mg_3Al_2Si_3O_<12>体系中，正辉石+堇青石+尖晶石的矿物组合不稳定，在10000C ~ 102500℃、1atm的一定温度下转变为橄榄石+堇青石+尖晶石。Assoc。宠物。分钟。经济学。青烟。， 93, 18-26, 1998)。(c)对尖晶石+石英和蓝宝石+石英在Mg_3AI_2Si_3O_<12> (pyrope composition)体系中AI_2o_3在正晶石中的溶解度进行了高压实验，结果表明，该反应的相界为：2MgAI_20_4 (SpI) + Si0_2 (Qtz) = Mg_2Al_4Si0_<10> (Spr)，在1300 c（准备投料）的压力范围为1.5 ~ 1.75 GPa。矿物。汽油)。少