Session Details
T12[Topic] Latest Studies in Sedimentary Geology
Mon. Sep 14, 2026 3:00 PM - 5:45 PM JST
Mon. Sep 14, 2026 6:00 AM - 8:45 AM UTC
Mon. Sep 14, 2026 6:00 AM - 8:45 AM UTC
oral room 3(Lecture room A)
Chiar:Fumito SHIRAISHI, Natsuko ADACHI(Osaka Metropolitan University)
[T12-O-1]Factors controlling canal-type tufa formation: A comparative analysis of three tufa types
*Fumito SHIRAISHI1, Andreas Reimer2, Helge Mißbach-Karmrodt2, Patrick Brockmann2, Gernot Arp2 (1. Hiroshima University, 2. University of Göttingen)
[T12-O-2]Carbonate precipitates in a sea cave on Kuroshima Island, Wakayama Prefecture
*Akihiro Kano1, Kenji Kashiwagi2, Shota Kotake3 (1. Tokyo University of Marine Science and Technology, 2. Toyama University, 3. Pioneer Caving Club)
[T12-O-3](Invited) A new approach to the dolomite problem through inorganic synthesis experiments using amorphous carbonate precursors
*Aki SAKUMA1, Taiga OKUMURA2, Hiroyuki KAGI1, Kokoro SHIBUYA1, Takaaki ITAI1, Koki FURUSHO1 (1. The University of Tokyo, 2. Waseda University)
【ハイライト講演】ドロマイトは地質時代の炭酸塩岩に普通に含まれている一方で，現世環境では過飽和であってもほとんど形成されず，また実験室で合成することすら困難である．これは「ドロマイト問題」と呼ばれており，研究者を長年悩ませてきた．本講演では，この問題に関する最近の研究動向が紹介され，また粘土鉱物を介した非晶質相形成が問題解決の鍵になる可能性が示される． ※ハイライト講演とは．．．
[T12-O-4]Key points to note regarding early carbonate diagenesis
*Hiroki MATSUDA1 (1. Fukada Geological Institute)
[T12-O-5]Cryptic microbialite development inside a Middle Holocene coralgal reef, Okinawa Jima, the Ryukyu Islands
*Kazuhiko Fujita1,2, Sho Koyano2, Masaaki Chinen3, Fumito Shiraishi4, Chuki Hongo5, Marc Humblet6, Ryuji Asami7, Yasufumi Iryu7, Yosuke Miyairi8, Yusuke Yokoyama8, Hironobu Kan9 (1. Fukui Prefectural University, 2. University of the Ryukyus, 3. MicroRange, 4. Hiroshima University, 5. Nanki Kumano Geopark Center, 6. Nagoya University, 7. Tohoku University, 8. The University of Tokyo, 9. Kyushu University)
[T12-O-6]Discovery and reef-palaeoecological significance of Moscovian stromatoporoids in the Akiyoshi Limestone, Southwest Japan
*Yuma SHIBASAKI1, Yoichi EZAKI1, Koichi NAGAI2, Natsuko ADACHI1, Tetsuo SUGIYAMA3 (1. Osaka Metropolitan University, 2. University of the Ryukyus, 3. Fukuoka University)
[T12-O-7]Features of microbial reefs and marine environments unique to the Furongian Chaomidian Formation, Shandong Province, North China
*Natsuko ADACHI1, Miku SHIMATANI1, Yoichi Ezaki1, Jianbo LIU2, Zhen YAN3 (1. Osaka Metoropolitan University, 2. Peking University, 3. Chinese Academy of Geological Sciences)
[T12-O-8]Mode of stromatolite formation in the Cambrian Zhangxia Formation, Jinan, Shandong Province, China: comparison with associated thrombolite
*Yoichi EZAKI1, Mona Asai1, Natsuko Adachi1, Zhen Yan2, Jianbo Liu3 (1. Osaka Metropolitan University, 2. Chinese Academy of Geological Sciences, 3. Peking University)
[T12-O-9]Characteristics, habitats, and ages of early eukaryotes from the Mesoproterozoic carbonate succession of India
*Abhishek Kumar Pandey1, Partha Pratim Chakraborty2, Ryoichi Nakada3, Naotaka Tomioka3, Kazumasa Aoki4, Kaushik Das1, Fumito Shiraishi1 (1. Hiroshima University, 2. University of Delhi, 3. JAMSTEC, 4. Okayama University of Science)
【ハイライト講演】真核生物は約21億年前に出現し，約18～8億年前に多様化した．しかしながら，その時期の酸素濃度は，真核生物の生息に必要な量を大きく下回っていたと考えられており，矛盾が生じていた．本講演では，初期の真核生物化石を産するインドの炭酸塩岩が約16億年前のものであり，その当時，シアノバクテリアが放出した酸素を利用して真核生物が生き延びていたことなどが示される．※ハイライト講演とは．．．
[T12-O-10]Formation factors and ages of phosphate stromatolites in the Paleoproterozoic Jhamarkotra Formation, India
*Kuon SATO1, Abhishek Kumar PANDEY1, Partha Pratim CHAKRABORTY2, Akihiro KANO3, Ryoichi NAKADA4, Kazumasa AOKI5, Fumito SHIRAISHI1 (1. Earth and Planetary System Science Program Graduate School of Advanced Science and Engineering, Hiroshima University, 2. Delhi University, 3. Tokyo University of Marine Science and Technology, 4. JAMSTEC, 5. Okayama University of Science)