Faunal analysis of Early to Middle Jurassic radiolarians

早侏罗世至中侏罗世放射虫的区系分析

• 批准号: 02454029
• 负责人: YAO Akira
• 金额: $ 3.71万
• 依托单位: Osaka City University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-02454029/
• 关键词: Early to Middle Jurassic; radiolarian fossil; faunal analysis; specific composition; quotient of similarity; rate of origination; rate of extinction; faunal change

Radiolarian faunal composition was analyzed for five samples of Early to Middle Jurassic manganese carbonate nodule (M NJ-12, 9 Hi-145, GH-1, 0 IN-7 and S IN-1) from Mesozoic sedimentary complex of the Mino tertane, central Japan. The results are summarized as follows :(1) Specific number of each sample is 200 300, and these number are larger than those from chert and clastic samples.(2) Characteristic species of each sample have been assigned their geologic age to that (1) late Pliensbachian - Early Toarcian (185 Ma), (2) Aalenian (176 Ma), (3) early Bajician (172 Ma), (4) Bajocian (168 Ma) and (5) Bathonian (165 Ma). The estimation of the age order is supported by their quotient of similarity [QS] among faunas. QS were caluculated with a formula, QS = 2c / (a+b) [a, b : specific number of fauna, c : common specific number between a and b faunas].(3) It is inferred that style of faunal change was controled by a combination of both short ranged specific group (several million years) and long ranged specific group (more than ten million years).(4) Rate of origination and extinction of species also played an important role in control of the style of faunal change. The rate was calculated with a formula, R = a or b / t[a, b : number of originated species or extinct species, t : age interval between each sample ; my. l.

对日本中部美浓岬中生代沉积杂岩的五个早侏罗世至中侏罗世碳酸锰结核样本（M NJ-12、9 Hi-145、GH-1、0 IN-7 和 S IN-1）进行了放射虫区系组成分析。结果总结如下：（1）每个样品的具体数量为200 300个，比燧石和碎屑样品的数量要多。（2）每个样品的特征物种的地质年龄分别为（1）晚普林斯巴赫世-早托阿尔世（185 Ma），（2）阿伦世（176 Ma），（3）早巴吉世（172 Ma），（4）巴约西亚 （168 Ma）和（5）巴通阶（165 Ma）。动物群之间的相似商[QS]支持年龄顺序的估计。 QS的计算公式为：QS = 2c / (a+b) [a,b：动物群的具体数量，c：a和b动物群之间的共同具体数量]。（3）推断动物群变化的方式是由短程特定类群（几百万年）和长期特定类群（超过千万年）共同控制的。（4）物种的起源和灭绝速度也起着重要作用。角色 控制动物区系变化的风格。比率的计算公式为：R = a 或 b / t[a,b：起源物种或灭绝物种的数量，t：每个样本之间的年龄间隔；我的。湖

项目成果

Ichikawa,K.: "Pre-Cretaceous Terranes of Japan" IGCP Project No.224, 413 (1990)

Ichikawa,K.：“日本前白垩纪地体”IGCP 项目 No.224, 413 (1990)

Faure,M.: "The significance of Upper Jurassic radiolarians in high pressure mefamorphic rocks of SW Japan" Jour,Southeast Asian Earth Sci.6. 131-136 (1991)

Faure,M.：“日本西南部高压变质岩中上侏罗统放射虫的意义”，Jour，东南亚地球科学.6。

Faure, M., Iwasaki, M., Ichikawa, K. and Yao, A.: "The significance of Upper Jurassic radiolatians in high pressure metamorphic rocks of SW Japan." Jour. Southeast Asian Earth Sci.6, no. 2. 131-136 (1991)

Faure, M.、Iwasaki, M.、Ichikawa, K. 和 Yao, A.：“上侏罗统放射线在日本西南部高压变质岩中的意义”。

Ichikawa, K., Mizutani, S., Hara, I., Hada, S. and Yao, A. (eds.): "Pre-Cretaceous Terranes of Japan." Publication of IGCP Project. No. 224. 413 (1990)

Ichikawa, K.、Mizutani, S.、Hara, I.、Hada, S. 和 Yao, A.（编）：“日本前白垩纪地体”。

Mizutani,S.: "Radio larians and terranes : Mesozoic geolagy of Japan" Episodes. 14. 213-216 (1991)

Mizutani,S.：“射电虫和地体：日本中生代地质学”剧集。