Deciphering surface environment in the late Proterozoic using Re-Os measurement.

利用 Re-Os 测量破译晚元古代的地表环境。

• 批准号: 24840021
• 负责人: SAWAKI Yusuke
• 金额: $ 1.91万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Research Activity Start-up
• 财政年份: 2012
• 资助国家: 日本
• 起止时间: 2012-08-31 至 2014-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-24840021/
• 关键词: 後期原生代; レニウム・オスミウム; Sulfidic; 南中国三峡地域; 南中国; ReOsアイソクロン; 黒色頁岩

Global correlation of Precambrian stratigraphic successions can be conducted by the coarse resolution off biostratigraphic and chemostratigraphic records, because of the scarcity of precise U-Pb zircon dating. Re-Os isotope systems of organic matter-rich black shales became one of the reliable indicators of the depositional age, due to the recent developments in Re-Os analysis.Rock powders were prepared from drill-core collected at Three Gorge, South China. Re and Os isotopic compositions were measured by TIMS at JAMSTEC. The 187Re/188Os and 187Os/188Os ratios of the black shales show linearity in the isochron plot. The model 3 isochron ages were 578 Ma (error is 12 Ma) for the black shale at the lower Member 4 of the Doushantuo Fm, with initial 187Os/188Os ratios of 1.02 (2SD=0.09). The Re-Os isochron plot for all analyses yields an age of 512 (error is 12 Ma) for the black shale at the bottom of the Shuijingtuo Fm, with initial 187Os/188Os ratios of 1.15 (2SD=0.19).

由于缺乏精确的锆石U-Pb定年方法，前寒武纪地层序列的全球对比只能通过生物地层和化学地层记录的粗分辨率进行。由于Re-Os同位素分析技术的发展，富含有机质的黑色页岩的Re-Os同位素体系已成为沉积时代的可靠标志之一。在JAMSTEC用TIMS测定了Re和Os同位素组成。黑色页岩的~（187）Re/~（188）Os和~（187）Os/~（188）Os比值在等时线图上呈线性关系。陡山沱组四下段黑色页岩的模式3等时线年龄为578 Ma（误差为12 Ma），初始187 Os/188 Os比值为1.02（2SD=0.09）。所有分析的Re-Os等时线图得出水井沱组底部黑色页岩的年龄为512 Ma（误差为12 Ma），初始187 Os/188 Os比值为1.15（2SD=0.19）。

项目成果

Petro-genesis of Mn-ore in the Neoproterozoic.

新元古代锰矿的岩石成因。

• 发表时间: 2012
• 作者: Sakie Suzuki;渡辺優;藤嶋陽平;澤木佑介
• 通讯作者: 澤木佑介

初期太古代Labrador地域Nulliak表成岩中の縞状鉄鉱層、炭酸塩岩、チャートの産状と地球化学的研究

早太古代拉布拉多地区努利亚克附石岩中带状铁层、碳酸盐岩和燧石的赋存及地球化学研究

• 发表时间: 2012
• 作者: 青木翔吾

The Cambrian Explosion: Plume-driven birth of the second ecosystem on Earth

• DOI: 10.1016/j.gr.2013.03.013
• 发表时间: 2014-04
• 期刊: Gondwana Research
• 影响因子: 6.1
• 作者: M. Santosh;S. Maruyama;Y. Sawaki;J. Meert

Oxic ocean in the late Ediacaran and early Cambrian

埃迪卡拉晚期和寒武世早期的含氧海洋

• 发表时间: 2013
• 作者: 澤木佑介;他6名
• 通讯作者: 他6名

Intensive continental weathering rate in the Lower Cambrian: evidenced from Sr isotope ratios preserved in the strata at the Three Gorges

下寒武统强烈的大陆风化速率：从三峡地层保存的Sr同位素比值证明

• 发表时间: 2013
• 作者: 澤木佑介;小宮剛;丸山茂徳
• 通讯作者: 丸山茂徳