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静岡大学地球科学研究報告 (1975-) >
1994 21 >

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タイトル: 紀伊半島東部, 海山地域の四万十帯上部白亜系
その他のタイトル: Upper Cretaceous strata in the Shimanto Belt of the Miyama area, eastern Kii Peninsula, Southwest Japan.
著者: 田邊, 裕高
狩野, 謙一
掲載誌名: 静岡大学地球科学研究報告
出版者: 静岡大学地球科学教室
巻: 21
開始ページ: 1
終了ページ: 10
出版日付: 1994-09
NDC: 455
抄録: The Geology of the Shimanto Belt has been examined in the Miyama area, north of Owase, eastern Kii Peninsula, Southwest Japan. The strata in this area can be divided lithologically into three thrust-bounded formations or tectonostratigraphic units : the Mizunomitoge, Ookogawa and Shimakatsuura Formations from north to south. The Mizunomitoge Formation consists mainly of melange rocks with block-in-matrix fabrics. The Ookogawa Formation is a unit of sandstone-dominated coherent beds, and the Shimakatsuura Formation is also a unit of coherent beds mainly composed of alternating beds of sandstone and mudstone. Radiolarian fossils from these formations indicate that they are of Upper Cretaceous age. The mudstones from these formations show nearly the same illite crystallinity value belonging to the level of diagenetic and lower anchimetamorphic zones. The diagenesis and metamorphism occurred probably by the rise of geothermal gradient in a short period during the Early and Middle Miocene. The thermal maturity also suggests that these strata were accreted in a shallower tectonic level of a convergent margin.
ISSN: 03886298 OPAC
NII論文ID: 110000413359 ciniia
NII書誌ID: AN00103190 OPAC ciniib
バージョン: publisher
出現コレクション:1994 21

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