Russian - U.S. Scientific Cooperative Project: Petrotectonic Study of Ultrahigh-Pressure Rocks in the Kokchetav Massif and the Maksyutov Complex of the Ural Mtns.

9304480科尔曼这一美国-俄罗斯多学科合作研究项目将涉及对科切塔夫地块和乌拉尔山脉马克修托夫杂岩中的锥体内变质岩进行野外、岩石学、年代学和构造调查。已经从这些岩石中描述了在地幔深处的区域超高磷变质作用期间形成的微钻石和/或柯石英--它们存在于地球表面区域范围广泛的杂岩中，可能意味着极其重要的构造过程的运作。研究的具体目标包括鉴定和表征石榴石和锆石中晶体包裹体的组成，以确定超高变质的条件，圈定各种岩石的P-T-t轨迹，确定原岩的地球化学特征，并通过放射性测年确定变质事件的年龄。

9304480 Coleman This United States-Russian multidisciplinary cooperative research project will involve field, petrologic, geochronologic and tectonic investigations of intracratonal metamorphic rocks in the Kokchetav Massif and the Maksyutov Complex of the Ural Mountains. Microdiamonds and/or coesite, which form during regional ultrahigh-P metamorphism at mantle depths, have been described from these rocks - their presence in regionally extensive complexes at the Earth's surface may imply the operation of tectonic processes of profound importance. Specific goals of the research include identifying and characterizing the composition of crystalline inclusions in garnet and zircon to establish the conditions of the ultrahigh metamorphism, delineating the P-T-t paths of various rocks, determining the geochemical characteristics of protoliths, and establishing ages of the metamorphic events through radiometric dating.