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Elemental and isotopic systematics for the formation of earth's recources

地球资源形成的元素和同位素系统学

基本信息

批准号：
03453056
负责人：
NAKANO Takanori
金额：
$ 4.16万
依托单位：
University of Tsukuba
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1993
项目状态：
已结题

项目摘要

Elemental and isotopic methods were extensively applied for a variety of materials in order to understand the resource and environmental problems which are intimately related each other in terms of material transports on the earth. About 100 crude oils from Akita to Niigata area in the Green-Tuff region show a regional variation in the delta ^<34>S.A significant variation of delta ^<34>S was also recognized within a single oil-field. These data provide key constraints for the formation of crude oils. Systematic Sr and Nd isotope study were performed for granitic rocks in the Okchon belt, central Korea. The Rb-Sr isochron for whole-rocks and mineral-separates revealed the intrusion age in a range from Carboniferous to Cretaceous and thermal metamorphism in Jurassic age. Nd isotopic data show that the Okchon granitoids were formed by remelting of Protoerozoic materials in the lower crust. Formation process of endoskarns and scheelites were also described and studied using elemental methods. Sr isotope methods were also applied for surface waters and land plants in orderot evaluate the potential as an environmental tracer and a mineral exploration tool. Sr isotopic ratios of rain water display a seasonal variation in accordance with the temporal heterogeneity of source aerozols dissolved into the rain. Plants standing along the wall of cliff and in far distance away from the groundwater table are relatively uniform in an area and is irrespective of bedrocks, but is different between areas in wider scale. This indicates that Sr of such land plants can be used as a monitor of atmospheric aerozols. Sr isotopes have been proved to provide a crucial constraint on the material transports in the soil-plant-atmosphere system.

元素和同位素方法被广泛应用于各种物质，以了解地球上物质运输方面相互密切相关的资源和环境问题。从秋田到新泻地区的约100个原油显示出三角洲S的区域性<34>变化<34>。这些数据为原油的形成提供了关键的制约因素。对朝鲜中部玉川带花岗质岩石进行了系统的Sr和Nd同位素研究。全岩和矿物的Rb-Sr等时线显示，侵入时代为石炭纪至白垩纪，热变质作用发生在侏罗纪。Nd同位素数据表明，沃川花岗岩类是由下地壳中的原古生代物质重熔形成的。用元素方法研究了内矽卡岩和白钨矿的形成过程。Sr同位素方法也被应用于地表沃茨和陆地植物，以评估其作为环境示踪剂和矿产勘探工具的潜力。雨水锶同位素比值的季节性变化，根据源气溶胶溶解到雨的时间异质性。沿着崖壁和远离地下水位的植物分布在区域内相对均匀，与植被无关，但在更大范围内区域间存在差异。这表明这些陆生植物的Sr可以作为大气气溶胶的监测指标。Sr同位素对土壤-植物-大气系统的物质输运具有重要的制约作用。