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Unified stratigraphy by means of Oxygen isotopes and microfossils for Paleozoic-Mesozoic siliceous deposits

古生代-中生代硅质矿床氧同位素和微化石统一地层学

基本信息

批准号：
14340148
负责人：
MATSUOKA Atsushi
金额：
$ 9.22万
依托单位：
Niigata University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14340148/
关键词：
Siliceous deposits chert radiolaria Mesozoic Paleozoic Oxygen Isotope

项目摘要

This project aims at unifying biostratigraphy by means of microfossils such as radiolarians and Oxygen isotope stratigaphy. The most important agenda for this project was to make up a laser microprobe analyzer composed of a laser unit and Oxygen purification lines. The analyzer has been completed at the end of the project term due to twice moves in connection to the renewal of an old building and the construction of a new building. However, the newly established analyzer is much more useful than originally planed because it produces not only Oxygen isotopes but also Silicon isotopes.Oxygen isotopes of deep sea siliceous deposits obtained from the Pacific during ODP Leg 129 were measured by using a laser microprobe analyzer in the Geological Survey of Japan before the analyzer in Niigata University was set up. A preliminary result indicates that Upper Jurassic to Lower Cretaceous stratigraphy by means of Oxygen isotope and radiolaria is successfully unified.Radiolarian biostratigraphic and micropaleontologic researches were carried out in the Mino and Chichibu Terranes, Southwest Japan. Scientific results on radiolarian paleontology and stratigraphy came from Southern Tibet in China and the North Palawan Block in the Philippines. Pelagic biogenic siliceous rocks have been collected systematically from Switzerland, Italy and Slovenia in the European Alps. These samples will be used for Oxygen and Silicon isotope measurements in the near future.

该项目旨在通过微体化石如放射虫和氧同位素地层学来统一生物地层学。该项目最重要的议程是组成一个由激光单元和氧气纯化线组成的激光微探针分析仪。分析仪已在项目期末完成，原因是两次搬迁，一次是旧建筑的更新，一次是新建筑的建造。在新泻大学建立激光探针分析仪之前，利用日本地质调查局的激光探针分析仪对ODP第129航次太平洋深海硅质矿床的氧同位素进行了测量。利用氧同位素和放射虫成功地统一了日本西南部美浓地体和秩父地体的上侏罗世-下白垩世地层，并进行了放射虫生物地层学和微体古生物学研究。中国藏南地区和菲律宾北巴拉望地块的放射虫古生物学和地层学研究成果。在欧洲阿尔卑斯山的瑞士、意大利和斯洛文尼亚，系统地收集了远洋生物硅质岩。这些样品将在不久的将来用于氧和硅同位素测量。