Elucidation of the origin of microbial mat-related structures formed on siliciclastic rocks

• Project/Area Number: 16K13891
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Geology
• Research Institution: Hiroshima University
• Principal Investigator: Shiraishi Fumito 広島大学, 理学研究科, 助教 (30626908)
• Research Collaborator: CHAKRABORTY PARTHA P. デリー大学, 地質学科, 教授 ; BANERJEE SANTANAU インド工科大学, ボンベイ校地球科学部, 教授 ; PRITAM PAUL インド工科大学, ボンベイ校地球科学部, ポストドクトラルフェロー ; MORIKAWA ASAYO 広島大学, 大学院理学研究科, 大学院生 ; TANIGAWA YUSUKE 広島大学, 大学院理学研究科, 大学院生 ; KAWAGUCHI MINAMI 広島大学, 大学院理学研究科, 学部生
• Project Period (FY): 2016-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000); Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2016: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
• Keywords: 微生物マット構造 / 地質学

Outline of Final Research Achievements

Modern and ancient samples of microbial mat-related structures were investigated in India for understanding the origin of these structures. For modern samples, it has been revealed that the structures affiliated to microbial mat-related structures by previous studies were the products of evaporitic halite cementation. For ancient samples, sandstone did not provide useful information for understanding their origin, although they were considered to be prospective. On the other hand, we have newly recognized microbial mat-related structures from banded iron formation. These structures were formed by growing the siliceous nodules inside the deposits. This finding implied the similar origin of microbial mat-related structures found in the siliciclastics.

Research Products

• [Int'l Joint Research] デリー大学/インド工科大学(インド)