U.S.-China Cooperative Research: Geochemistry and Origin of Archean Granulities in Northeastern China

中国拥有地球上相当大一部分的 古老的岩石，西方地质学家大多不知道。 这项建议 在肯特C.新的康迪 墨西哥矿业与技术学院和钱祥林博士 北京大学将以北京市葛湖窑地区为特色， 中国东北地区的合作场和地球化学研究 太古宙高级表壳岩及伴生侵入岩 岩石化学分析方法 这个麻粒岩带包含了所有 太古代高级砂岩的典型表壳岩， 广泛分布长英质和镁铁质麻粒岩，可能为火成岩 起源 其平行的绿岩带和高品位带提供了 一个不寻常的机会来研究 这两个太古代协会的关系。 因为它的 丰富的镁铁质麻粒岩可能反映了 比在印度南部和其他地方暴露的太古代地壳， 更准确地估计下太古代地壳的成分 应该是可能的，揭示了大陆是如何形成的。 研究人员将绘制关键暴露，完成主要和 变火成岩和变沉积岩的微量元素分析 岩石，进行岩浆起源和来源的地球化学研究， 进行结构和变质研究。 德国和法国 合作者将研究地质测温法、地质测压法和Nd和Pb 各向同性，并做锆石U-Pb定年。 该项目是联合 由NSF和中国国家自然科学基金会赞助 基金会

China contains a substantial fraction of the earth's exposures of ancient rocks, mostly unknown to Western geologists. This proposal in early crustal studies between Dr. Kent C. Condie of the New Mexico Institute of Mining and Technology and Dr. Qian Xianglin of Beijing University will characterize terranes of the Gehuyao area of Northeast China by a collaborative field and geochemical study of Archean high grade supracrustal rocks and associated intrusive rocks. This granulite belt contains excellent exposures of all supracrustal lithologies typical of Archean high grade terranes, with widespread felsic and mafic granulites of probable igneous origin. Its parallel greenstone and high grade belts offer an unusual opportunity to study the structural and compositional relationship of these two Archean associations. Because its abundant mafic granulites probably reflect a deeper section of Archean crust than is exposed in southern India and elsewhere, a more accurate estimate of the composition of the lower Archean crust should be possible, shedding light on how the continents formed. The researchers will map critical exposures, complete major and trace element analysis of both metaigneous and metasedimentary rocks, perform geochemical studies of magma origin and source, conduct structural and metamorphic studies. German and French collaborators will study geothermometry geobarometry and Nd and Pb isotropes, and do U Pb zircon dating. This project is jointly sponsored by NSF and the Chinese National Natural Science Foundation.