Ancient submarine-canyon system developed within fore-arc basin fill, Mio-Pliocene “Miyazaki facies,&rdquo: Miyazaki Group, western Japan

DOI Web Site Web Site 4 Citations 61 References
  • Takashimizu Yasuhiro
    Hydrogeology Section, Department of Environmental Geology, Geological Survey of Hokkaido Present address: Mathematical and Natural Sciences, Faculty of Education, Institute of Humanities, Social Sciences and Education, Niigata University

Bibliographic Information

Other Title
  • 前弧海盆に発達した化石海底谷システム：中新－鮮新統宮崎層群“宮崎相”の堆積学的解析
  • ゼン コカイボン ニ ハッタツ シタ カセキ カイテイコク システム チュウ シン センシントウ ミヤザキソウグン ミヤザキソウ ノ タイセキガクテキ カイセキ

Search this article

Description

The late Miocene to Pliocene “Miyazaki Facies&rdquo: (we use the term “Miyazaki Facies&rdquo: because it is established in the literature, although it represents the central part of the Miyazaki Group rather than a facies in the sedimentary sense) in the central part of the Miyazaki Group, consists of infill material within a fore-arc basin that morphologically consists of an active hinterland, narrow shelf, steep slope, and continuous gentle slope. The Kamurano Formation, which contains coarse-grained clastic sediments on the slope of the fan delta, is well preserved in the “Miyazaki Facies.&rdquo: Fifteen depositional facies are recognized in the “Miyazaki Facies&rdquo: and have been integrated into four facies associations according to the type and nature of flow energy: facies association CR consists of limestone, FL was transported and deposited by fluvial energy, WS by wave and storm energy, and GF by sediment gravity flow. Based on the results of sedimentologic and geologic analyses, a single submarine canyon system (Kamurano Submarine Canyon) was recognized on the continental slope.<br>During a relative rise in sea level, the fan delta was unable to prograde to the shelf edge, and the shelf was covered with fine sediment. During a relative fall in sea level, however, the narrow width of the shelf (about 2 km) meant that the fan delta was easily able to prograde to the shelf edge and thereby directly provide coarse-grained sediment to the submarine canyon.

Journal

Citations (4)*help

See more

References(61)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top