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

苏联南部大高加索山脉中部岩浆作用和地壳演化史

• 批准号: 9106023
• 负责人: Jason Saleeby
• 金额: $ 10万
• 依托单位: California Institute of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-07-01 至 1993-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9106023&HistoricalAwards=false
• 关键词: History; Magmatism; Crustal; Evolution; Central

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.

大高加索山脉是一个快速上升的 由伊朗-土耳其和 阿拉伯大陆块与俄罗斯克拉通。 合作 与苏联同事讨论了一些与构造有关的问题， 北方特提斯洋缘的演化、 处于活动边缘过程中的俄罗斯克拉通已被确定。 这些对于广泛应用的内-外加工工艺具有重要意义. 硅铝裂谷作用，对不规则变形的不规则响应 碰撞块体的形状以及 成分不均匀的基底推覆体进入新的硅铝质地壳 叠加的岩基岩浆作用 这项工作将集中在 Chegem河的构造背景和同位素地球化学 火山口和相关的岩石以及可能的关系 外高加索构造带，锆石U/Pb年代学 以前从Bechasin，Fore Range和Main采集的样本 山脉基底带与卡斯贝克的形成时代和构造背景 沿着南部边界的扩张带及相关侵入体 区 研究结果有望增加对硅铝地壳的认识 成因、中生代硅铝内裂谷作用和新构造体制 这一地区。