オマーン山脈西縁部の地質巡検記録
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概要
- 論文の詳細を見る
In 1999 and 2000,the writer had the luck to experience four geological field trips in the western rim of the Oman Range, both U.A.E. and Omani sides, which is known as a product of "obduction" movements of Cretaceous-Neogene age. In this area, the "ophiolite" mass (Semail Ophiolite ; allochthonous rocks) is covered by Cretaceous autochthonous sediments of Qahlah Formation (basal conglomerate) and Simsima Formation (carbonate rocks). Smaller blocks of alternated older sedimentary rocks called Sumeini Group (carbonate rocks and cherts) and Hawasina Complex (cherts and shales) observed in the vicinities of ophiolite outcrops are considered to be parts of the allochthonous rock mass. Paleogene carbonate rocks are beautifully exposed at an isolated hill called Jabel Hafit, extending North to South along the anticlinal axis and associated faults, located just south of the city of Al Ain ; Nummulites, Rudists and other kinds of fossils are rich in those rocks. Strongly deformed features within them, such as steep bending, open folding, turning over of strata, elongated N-S reverse faults and a number of smaller E-W normal faults, indicate that they were placed in different stress fields in recent age. The writer expresses his gratitude to Professor Dr. Abdulrahman Alsharhan, Dean of the Faculty of Science, Professor Dr. Mohamed Abu-Zeid, Chief of Geology Department and the teaching staff of the United Arab Emirates University in Al Ain for their providing him those opportunities of field trips and Mr. Ken'ichi Kawaguchi of Japan Oil Development Company - Abu Dhabi Branch for his coordination and assistance.
- 城西大学の論文
- 2000-12-30