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

我的研究结果总结如下：1。橄榄石干旱斜叶二烯在系统中的热力学特性在Cao-mgo-sio_2（a）的橄榄石表现为无序的两个站点溶液，从理论研究Ca-fe-mg神的热力学特性（矿物质的热力学特性）（矿物质。1。，20，135-149，195-149，1998）。 Fe-MG分布系数高度取决于橄榄石的CAO含量，并且随着系统中的Ca^<2+>和Fe/（Fe/（Fe+mg）的增加而增加）（Rev.高压Sci。Tecnol。，7，95-97，1998）。（C）（C）将Clinopoxene的临时分组近似于临时的comportimections y近期的均等范围。 J.，33，33-58，1999）。（d）关于CA-FE-MG橄榄石溶液溶液的实验研究表明，OHIVINE是fe^<2+>>和mg^<2+>的两个定期解决方案，尽管Ca^<2+>是ca^<2+>毫无疑问，尽管Ca^<2+>尽管在M2的M2 of Olivi of Olivi中严格易于兑现。系统FEO -MGO -A1_20 _ <> 3 -SIO_2从下层壳到上地幔上层压力的实验研究。（a）时间Fe -mg在正pypyroxene和Cordierite之间进行FE -MG分区表明，该反应对温度的变化是敏感的，这是一个良好的地理位置（nipct）。（b）150-159）。在等效11ibium中的AI_2O_3溶解度上的压力实验，并在时间MG_3AI_2SI_3O_3O_3O_3O_3O_ <12>（pyrope组成）的时间内与Spinel+Quartz和Sapphirine+Quartz组合进行压力实验（Pyrope组成） MG_2AL_4SI0_ <10>（SPR），在1300 c（准备贡献的准备工作）之间定位在1.5至1.75 GPa之间。矿物。汽油。）。较少的