History of Magmatism and Crustal Evolution in the Central Greater Caucasus Mountain Range, Southern U.S.S.R.

大高加索山脉是一条快速上升的山脉，由伊朗-土耳其和阿拉伯大陆块体与俄罗斯克拉通碰撞而成。在与苏联同事的合作下，确定了俄罗斯克拉通参与活动边缘过程的若干问题，这些问题与特提斯北部洋缘的构造演化有关。这对于广泛应用的涎内裂谷作用过程、不规则形状碰撞块体的不规则变形响应以及成分不均匀的基底推覆通过叠加的基岩岩浆作用再循环到新的硅酸盐壳中具有重要意义。这项工作将集中于车根河火山口和相关岩石的构造背景和同位素地球化学及其与外高加索构造带的可能关系，以前从别查辛、前山和主山基底带采集的样品的锆石U/Pb年代学，以及卡斯贝克辉绿岩带和南部边界带相关侵入体的时代和构造背景。这些结果有望增加对唾液地壳成因、中生代涎内裂谷作用和该地区新构造体制的认识。

The Greater Caucasus Mountain Range is a rapidly rising mountain belt driven by the collision of the Iranian-Turkish and Arabian continental blocks with the Russian craton. In cooperation with Soviet colleagues a number of problems bearing on the tectonic evolution of the northern Tethys ocean margin, the involvement of the Russian craton in active margin processes have been identified. These have significance for widely- applicable processes of intra- sialic rifting, the irregular response to deformation of irregular shapes of collisional blocks and in the recycling of compositionally heterogeneous basement nappes into new sialic crust by superposed batholithic magmatism. The work will focus on the structural setting and isotope geochemistry of the Chegem River Caldera and related rocks and possible relationships to the transcaucasus structural zone, U/Pb zircons geochronology of previously collected samples from the Bechasin, Fore Range and Main Range basement zones and the age and tectonic setting of the Kasbek diabase belt and related intrusions along the southern boundary zone. Results are expected to increase knowledge of sialic crustal genesis, mesozoic intra-sialic rifting and the neotectonic regime of this area.