Biostratigraphy of conodonts and foraminifers across the boundary between permian and Triassic Systems in calcareous facies.

钙质相中二叠纪和三叠纪系统边界上的牙形刺和有孔虫的生物地层学。

• 批准号: 06454001
• 负责人: ADACHI Shuko
• 金额: $ 3.52万
• 依托单位: University of Tsukuba
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06454001/
• 关键词: Conodonts; Smaller Foraminifer; Permian; P; T boundary; Triassic

Recent study of the boundary problem of the Permian and Triassic-Systems in Japan has been initiated in strata which were deposited in the off-shore pelagic to semipelagic environments. The study in calcareous facies, however, was remained the result of investigations until 1960's and insufficient compared with the research in foreign countries. The present study was planed and conducted to obtain more advanced knowledge concerning the boundary problems between permian and Triassic Systems.We tried to establish the complete sections in calcareous facies including the P/T boundary in the following areas such as Kamura, Takachiho of Miyazaki Prefecture ; Taho Limestone, Shikoku ; Akasaka Limestone, Ogaki of Gifu Prefecture ; Gozen-yama Limestone, Okutama of Tokyo ; Kuzu Limestone, Aso county of Tochigi Prefecture ; Kamiiso Limestone, Hakodate of Hamatonbetsu of Hokkaido ; and Menashidomari near Hokkaido. In these sections, we establish hiostratigraphy of microfossils (mainly smaller foraminifers, fusulinacean foraminifers, conodonts, calcareous algae, and others) and analyzed vertical change of microfacies of carbonate rocks. As a result, we confirmed the intercalation of dolomitized facies and carbonaceous limestone in strata contain the P/T boundary.This stratigraphic and sedimentological evidence shows that the world-wide geochemical change of the sea water related with eustatic regression occurred at the boundary.

近年来，日本对二叠纪和三叠纪界线问题的研究，主要是从近海远洋至半远洋环境沉积的地层开始的。但对钙质相的研究一直停留在60年代的调查研究阶段，与国外相比还很不够。本研究是为了获得有关二叠纪和三叠系界线问题的更深入的认识而计划和进行的，我们试图在以下地区建立包括P/T界线在内的石灰岩相的完整剖面：宫崎县的Kamura、Takachiho石灰岩、四国的Taho石灰岩、岐阜县的Ogaki的赤坂石灰岩、东京的Okutama的Gozenyama石灰岩、栃木县的阿索县的久津石灰石;北海道的滨顿别的函馆的上矶石灰石;以及北海道附近的Menashidomari。在这些剖面中，我们建立了微体化石（主要是小有孔虫、梭形有孔虫、牙形刺、钙质藻类等）的生物地层学，并分析了碳酸盐岩微相的垂向变化。研究结果证实，地层中的碳酸盐化相和碳质灰岩夹层中含有P/T界线，这一地层学和沉积学证据表明，与海平面海退有关的全球性海水地球化学变化发生在该界线处。

项目成果

Igo, Hisayoshi et al.: "Early Triassic deep-sea pelagic anoxic claystone in British Columbia." Prof.H.Igo Commemorative Vol.ed.by H.Noda and K.Sashida. 245-251 (1996)

Igo, Hisayoshi 等人：“不列颠哥伦比亚省早三叠世深海中上层缺氧粘土岩。”

Sashida,K.: "The Permian/Triassic boundary in bedded chert sequence in Northern Thailand" Proc.International Symposium,Stratigraphic Correlation of Southeast Asia. 130- (1994)

Sashida,K.：“泰国北部层状燧石序列中的二叠纪/三叠纪边界”Proc.国际研讨会，东南亚地层对比。

Adachi, Shuko et al.: "Late Triassic radiolarians from siliceous bedded limestone in west Timor." Prof.H.Igo Commemorative Vol.ed.by H.Noda & K.Sashida. 225-234 (1996)

Adachi、Shuko 等人：“来自西帝汶硅质层状石灰岩的晚三叠世放射虫。”

Adachi, Shuko et al.: "Late Triassic radiolarians from siliceous bedded limestone in west Timor." Prof.H.Igo Commemorative Vol.ed.by H.Noda and K.Sashida. 225-234 (1996)

Adachi、Shuko 等人：“来自西帝汶硅质层状石灰岩的晚三叠世放射虫。”

Igo, Hisayoshi et al.: "Some Jurassic radiolarians from Busuanga Island,Calamian Island Group,Palawan,Philippines." Prof.H.Igo Commemorative Vol.,ed.by H.Noda & K.Sashida. 165-191 (1996)

Igo, Hisayoshi 等人：“来自菲律宾巴拉望卡拉棉群岛布苏安加岛的一些侏罗纪放射虫。”