Deciphering dimensions of the Miocene Large-scale Submarine fans in Shikoku Basin

2015 Fiscal Year Final Research Report

• Project/Area Number: 26610161
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Geology
• Research Institution: Kyoto University
• Principal Investigator: Naruse Hajime 京都大学, 理学(系)研究科(研究院), 准教授 (40362438)
• Co-Investigator(Kenkyū-buntansha): Park Jin-Oh 東京大学, 大気海洋研究所, 准教授 (70359199)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Keywords: 地質学 / 地震波探査 / 海底扇状地 / 南海トラフ / 中新世

Outline of Final Research Achievements

This study revealed dimensions of the Miocene Large-scale Submarine fans in Shikoku Basin, which develops from 15 to 11 Ma and extend 800 km offshore, and are more than 300 m in thickness. This is one of the largest dimensions of submarine fans in active margins. In addition, this study produced a theoretical model of submarine fans, and estimated that the submarine fans in the Miocene Shikoku Basin were formed by turbidity currents that is composed mainly of muddy sediments (>90 %). This implies that the chemical weathering and denudation are remarkably active in the provenance of the submarine fans.

Free Research Field

堆積学