【摘要】 以中国苏鲁石榴石橄榄岩和瑞士Arami石榴石橄榄岩的橄榄石中针状出溶体的研究为例,运用电子探针中的Map分析技术,很好地解决了图像与成分的对应性问题,使得测试结果真实、可信。为矿物出溶体的研究提供了新的思路。更多还原

【Abstract】 The mineral exsolution in olivine of garnet peridotite from the Sulu area, China and the Arami area, Switzerland, were studied by map analysis in eletronic probe microanalysis(EPMA). Because distinctive gray scale on EPMA diagram can reflect the difference of elemental contents in a mineral, it is probable to distinguish the exsolution from host mineral. The problem of the image in correspondence with their composition has been solved and the mineral exsolution phase can be recognized by map analysis. The result shows that the mineral exsolution in olivine from Sulu is Ti-bearing magnetite, and the mineral exsolution in olivine from in the Arami is ilmenite. The determination of mineral exsolutions in the olivines infers that these garnet peridotites are most likely derived from mantle transition zone of over 300 km deep.更多还原