Plume Tectonics and Earth's greatest biocrisis

地幔柱构造和地球最大的生物危机

• 批准号: 12573011
• 负责人: ISOZAKI Yukio
• 金额: $ 9.98万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12573011/
• 关键词: mass extinction; P-T boundary; double-phased extinction; South China; volcanism; 生層序; 炭素同位体; 火山灰; G-L境界; プルーム; ボーリング; G-L境; 超大陸; PT境界; 超酸欠事件

Field research was conducted along well-exposed sections in South China (Sichuan, Shaanxi, Yunnan, Guanxi, Zihejian) for 6 times in 4 years, in order to clarify the cause of the Earth's greatest mass extinction across the Paleozoic-Mesozoic boundary. In addition to the leader of the project, a Chinese counterpart (Prof. Yao) and 5 graduate students from Japan and China participated.Intensely studied were the Chaotian and Emeishan sections in Sichuan plus the Wujiapin section in Shaanxi. Detailed description in the field and collection of rock samples were combined with drilling. Rock samples were processed in the laboratory for XRF, Mass spectrometer, Moessbauer spectroscopy etc. Additional field study and indoor analysis were done for the equivalent rocks in Kyushu and Honshu (Japan) for comparison. Analysis focused on the double-phased mass extinction, i.e., both across the G-L, boundary and P-T boundary, and the following results were obtained.1.Extensive development of acidic tuff beds across the G-L and P-T boundaries of double-phased mass extinction.2.Further extension of these tuff beds in mid-oceanic paleo-atoll limestone in Japan.3.Synchronicity between double-phased mass extinction and acidic volcanism in a global scale.Above results were partly summarized into 17 scientific articles and 5 books. Publication of the rest results is going on in a proper schedule.

4年内对华南地区（四川、陕西、云南、广西、资河尖）暴露良好的地段进行了6次野外考察，旨在阐明跨越古生代-中生代界线的地球最大规模物种灭绝的原因。除项目负责人外，还有一名中国同行（姚教授）以及来自日本和中国的 5 名研究生参加。重点研究的是四川朝天和峨眉山剖面以及陕西吴家坪剖面。现场详细描述和岩石样品采集与钻探相结合。岩石样品在实验室进行 XRF、质谱仪、穆斯堡尔光谱仪等处理。对九州和本州（日本）的等效岩石进行了额外的现场研究和室内分析以进行比较。重点对跨越G-L边界和P-T边界的双相大规模灭绝进行了分析，得到了以下结果：1.跨越双相大规模灭绝的G-L和P-T边界酸性凝灰岩层广泛发育。 2.日本大洋中部古环礁灰岩中这些凝灰岩层的进一步延伸。3.双相大规模灭绝与酸性灭绝之间的同步性上述结果部分总结为 17 篇科学文章和 5 本书。其余结果的公布正在按照适当的时间表进行。

项目成果

Matsuo, M., Kubo, K., Isozaki, Y.: "Mossbauer spectroscopic study on characterization of iron in the Permian to Triassic deep-sea chert from Japan"Hyperfine Interact (c). 5. 435-438 (2003)

Matsuo, M.、Kubo, K.、Isozaki, Y.：“日本二叠纪至三叠纪深海燧石中铁特征的穆斯堡尔光谱研究”Hyperfine Interact (c)。

Isozaki, Y., Ota, A.: "Middle/Upper Permian (Maokouan/Wuchiapingian) boundary in mid-oceanic paleo-atoll limestone in Kamura and Akasaka, Japan."Proc.Japan Acad.. 77B. 104-109 (2001)

Isozaki, Y., Ota, A.：“日本卡村和赤坂洋中古环礁石灰岩中/上二叠统（Maokouan/Wuchiapingian）边界。”Proc.Japan Acad.. 77B。

Maruyama, S., et al.: "History of the Earth and Life (Nakashima, S.eds.)"Univ.Acad.Press. 355 (2002)

Maruyama, S. 等人：“地球与生命的历史（Nakashima，S.eds.）”Univ.Acad.Press。

磯崎 行雄: "大量絶滅:史上最大の生物危機の謎を探る"生命の科学「遺伝」別冊. no 12. 163-173 (2000)

矶崎由纪夫：《大规模灭绝：探索历史上最大的生物危机之谜》《生命科学》《遗传学》特别版，第12期。163-173（2000年）。

磯崎行雄 他: "生命と地球の歴史,三愛新書No.166"三愛会,東京. (2000)

Yukio Isozaki 等：“生命与地球的历史，San-ai Shinsho No. 166” San-ai-kai，东京（2000 年）。