Secular variation of carbon isotopic compostition of the Phanerozoic shallow marine carbonates.

显生宙浅海碳酸盐岩碳同位素组成的长期变化。

• 批准号: 07640595
• 负责人: MATSUMOTO Ryo
• 金额: $ 1.34万
• 依托单位: UNIVERSITY OF TOKYO
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07640595/
• 关键词: Carbon isotopic composition; carbonates; travertine; carboniferous; Devonian; Cambrian; Ordvician; 石炭系; イラン; 先カンブリア・カンブリア境界; ファメニア・フラニアン境界; 絶滅事変; 炭素同位体; 酸度同位体; ストロンチウム同位体; 境界事変; カンブリア系; オルドビス系; ドロマイト

The purpose of this research is to ellucidate the secular variation of the oceanic cabon isotopic composition throughout the Phanerozoic era, based on the fact that the carbon isotopic composition of shallow marine carbonated reflect the oceanic carbon isotopes. Geologic survey and sampling were made in the first year, and isotopic analysis was made in the second year.1, Limest one from the Carboniferous Onimaru and Nagaiwa Formations of South Kitakami were measured and sampled. Visean dolomite and calcite are relatively depleted in 13-C compared with the Namurian and Westpharian carbonates, however, most of the data are plotted within the range of 2 to 5 permil.2, Travertine limestone of Shirahone Spa were analyzed to show the variatin witin inland lake. Carbon isotopic values are mostly enriched in 13-C,ranging from 0 to 6 permi.3, Cambro-Ordvician carbonates of the Chosen Group of Korea were observed to show strong negative anomaly at the Middle to Upper Cambrian strata. The Ordvician section is characterzed by lighter signatures.4, Devonian-Carboniferous sections of northeran Iran were measured and sampled. Carbon isotopic values range between 1 and 3 permil for the Devonia section, but the Visean section show a general decreasing trend as observed in Kitakami massif.

本研究的目的是基于浅海碳酸盐岩的碳同位素组成反映了大洋碳同位素的事实，阐明整个显生宙时期大洋碳同位素组成的长期变化。第一年进行地质调查和取样，第二年进行同位素分析。1、对北上南石炭系鬼丸组和长岩组石灰岩进行了测量和取样。与那穆里安和威斯特伐利亚碳酸盐岩相比，Visean 白云石和方解石在 13-C 中相对贫化，然而，大多数数据绘制在 2 至 5 permil 的范围内。2 对 Shirahone 温泉的石灰华石灰岩进行了分析，以显示其变化情况内陆湖。碳同位素值主要富集于13-C,范围为0~6permi。3、在中上寒武统地层中观察到韩国朝鲜群寒武—奥陶系碳酸盐岩呈现强烈的负异常。奥德纪剖面的特征是较轻的特征。4，对伊朗北部的泥盆纪-石炭纪剖面进行了测量和采样。泥盆地剖面的碳同位素值范围在 1 至 3 permil 之间，但 Visean 剖面显示出总体下降趋势，如北上地块所观察到的。

项目成果

松本良: "炭酸塩の炭素同位体組成異常の要因と新しいバラダイム「ガスハイドレート仮説」" 地質学雑誌. 101. 902-924 (1955)

Ryo Matsumoto：“碳酸盐碳同位素组成异常的原因和新范式‘天然气水合物假说’”地质杂志 101. 902-924 (1955)。

Kimura,H.,Matsumoto,R.,Kakuwa,Y.,and Hamdi,B.: "Vendian-Cambrian carbon isotope record : evidence for overtuming of the ocean before the Cambrian Explosion." E.P.S.L.(1997)

Kimura,H.、Matsumoto,R.、Kakuwa,Y.和 Hamdi,B.：“旺迪安-寒武纪碳同位素记录：寒武纪大爆发之前海洋翻转的证据。”

松本良: "白骨温泉のトラバーチン堆積物" 地質学雑誌. (発表予定). (1997)

Ryo Matsumoto：“白根温泉的石灰华矿床”地质杂志（待出版）。

Kimura, H., Matsumoto, R., Kakuwa, Y., and Hamdi, B.: "Vendian-Cambrian carbon isotope record : evidence for overturning of the ocean before the Cambrian Explosion" E.P.S.L.(1997)

Kimura, H.、Matsumoto, R.、Kakuwa, Y. 和 Hamdi, B.：“Vendian-Cambrian 碳同位素记录：寒武纪大爆发前海洋翻转的证据”E.P.S.L.(1997)

Kimura,H.: ""Cambrian Explosion"was initiated by breakup of ocean stratification.21GC02:Geology" 24. (1996)

Kimura,H.：““寒武纪大爆发”是由海洋分层的破裂引发的。21GC02：地质学”24。（1996）