The titanian esseneitic diopside in Al-skarn from Myojin and Mutsuki islands in Seto Inland Sea, Japan

DOI Web Site 3 Citations 36 References
  • NISHIO Daisuke
    Institute of Biology and Earth Science, Petrology and Economic Geology, Graduate school of Science-And-Engineering, Ehime University
  • MINAKAWA Tetsuo
    Department of Earth Sciences, Faculty of Science, Ehime University

Bibliographic Information

Other Title
  • 明神島および睦月島に見られるＡｌ質スカルンに産するｔｉｔａｎｉａｎ　ｅｓｓｅｎｅｉｔｉｃ　ｄｉｏｐｓｉｄｅ
  • ミョウジンジマ オヨビ ムツキジマ ニ ミラレル Alシツ スカルン ニ サンスル titanian esseneitic diopside

Search this article

Abstract

The reinvestigation of so-called titanian fassaite from Myojin island, Seto Inland Sea of Japan, has revealed that the minerals are titanian-esseneitic-diopside by chemistry. The diopsides with similar chemical compositions were found in Mutsuki island.<br>These diopsides occur as dark crystalline aggregates of nodule in saccharodial limestone. The dark fragments in this area are recrystallized skarns, which underwent Al-Ti-Fe concentration composed of titanian esseneitic diopside, potassic-magnesiosadanagaite, hercynite, ilmenite, and aluminian titanite, as accessory phlogopite, apatite, and perovskite. These minerals almost all are rich in Ca-Al-Ti-Fe.<br> The electron microprobe analysis shows that the diopsides in this area have high Al2O3, TiO2 and Fe2O3 contents. Al ≥0.894, Ti ≥0.183, and Fe3+≥0.276 on the basis of O=6 and total cations=4. The diopsides have high molecule contents of esseneite, Ti-Tschermaks, and Ca-Tschermaks diopsides.<br> It is suggested that occurrence of the titanian esseneitic diopsides rock from Myojin and Mutsuki islands are from the sediment such as laterite or terra rossa, which is rich in the Al, Ti, and Fe, through the metamorphism with high temperature which is 600°C or more.

Journal

Citations (3)*help

See more

References(36)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top