Mineralogical Studies of Carbonatites.

碳酸岩的矿物学研究。

基本信息

批准号：
63470044
负责人：
HORIUCHI Hiroyuki
金额：
$ 4.93万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1990
项目状态：
已结题

项目摘要

Studies on textures and chemical conpositions of constituent minerals of carbonatites and alkaline rocks were performed mainly using specimens obtained by the Monbusho International Scientific Research Program entitled "Studies on rare-earth and radioactive minerals of alkaline complexes in Brasil" (Head Investigator : Professor Masayasu TOKONAMI). Main subjects are the observations of following phenomena : (1) alteration of pyroxene into serpentine by a metamorphism at the contact of jacupirangite with carbonatite, (2) remarkable leaching phenomena of alkaline metal and alkaline-earth metal ions not only from carbonates but also from silicates, oxides, etc., (3) characteristic concentrations of rare-earth elements in such phosphate minerals as monazite, cheralith, etc., and concentrations into rhabdophane, crandallite, goyazite, etc. as a result of weathering.In this project, we also contributed to the development of a microarea X-ray diffraction technique. By applying this method, we can identify minerals up to the minimum of 5-10 mum crystalline phases without destroy of the specimen. Furthermore, it is possible to determine the crystallo-graphic orientation relationship among different crystalline phases which are observed in textures.Thus, this method will contribute to clarify various complicated mineralization processes such as solidification of carbonaceous magmas and its metamorphism with alkaline rocks, weathering processes, etc., by combined observations of an optical microscope, scanning electron microscope, etc..

主要使用Monbusho International International Scientific Research计划获得的标本进行的碳酸盐和碱性岩石组成矿物的质地和化学结合，题为“巴西碱性复合物的稀有矿物质和放射性矿物质的研究”（负责人：负责人：Masayasu tokonami教授）。主要受试者是以下现象的观察：（1）在jacupirangite与碳酸盐岩接触时通过变质的变质改变将辉石的变化变化，（2）碱金属和碱金属离子的显着浸出现象，不仅是从碳酸盐中的碳酸盐，而且还浓缩了氧化物，3），（3）特征（3）（3）（3）（3）（3）（3）（3）（3）（3）（3）（3）（3）（3）（3）（3）（3）（3）（3）（3）（3）（3）矿物质为单唑7，Cheralith等，并浓度为纹状体，脑力石，goyazite等。由于风化。在这个项目中，我们还为Microarea X射线衍射技术的发展做出了贡献。通过应用这种方法，我们可以将矿物识别为最少5-10个妈妈结晶相，而不会破坏样品。此外，可以确定不同晶体相之间观察到的晶体形状方向关系。因此，这种方法将有助于阐明各种复杂的矿化过程，例如固化碳质岩浆及其与碱性岩石的变质，通过碱性岩石，潮流的循环过程，通过循环范围的循环范围扫描，扫描的循环范围，以扫描的循环范围。