Geochemical Evolution of the Earth

这是一个持续的项目，以碳酸盐岩和碱性复杂岩石的Pb、Sr和Nd示踪剂研究为探针，研究过去30亿年地球地幔的地球化学演化。他们现在计划研究各种特定的岩石；来自芬兰和乌干达的方解石，来自乌干达的碳酸盐中的C和O，来自古正长岩的O同位素，来自加拿大地盾碳酸盐的Hf，以及来自加那利群岛碳酸盐的Pb， Nd, Sr， O和C同位素。还将尝试从印度、中国和格陵兰岛获取碳酸盐岩。一项新的逆冲研究将测量意大利多拉迈拉（Dora Maira）含钴矿和铝锰矿岩石的年龄和同位素模式。这项研究将与来自德国、加拿大、意大利和瑞士的其他工作人员合作完成。

This is a continuing project on Pb, Sr and Nd tracer studies of carbonatites and alkaline-complex rocks as probes to study the geochemical evolution of the Earth's mantle over the past 3,000,000,000 years. They now plan to study avariety of specific rocks; calcites from Finland and Uganda, C and O in carbonatites from Uganda, O isotopes from ancient syenites, Hf from carbonatites of the Canadian Shield, and Pb, Nd, Sr, O and C isotopes on carbonatites from the Canary Islands provided by LeBas. There will also be an attempt to obtain carbonatites from India, China and Greenland. A new thrust will be a measurement of age and isotope patterns of coesite- and almandine-bearing rocks from Dora Maira, Italy. The reasearch will be done in collaboration with other workers from Germany, Canada, Italy and Switzerland.