Alpine metamorphism of the Pan-African gneiss basement in the Menderes Massif, SW-Turkey. New constraints from Lu-Hf and Sm-Nd garnet geochronology.

土耳其西南部门德雷斯地块泛非片麻岩基底的高山变质作用。

• 批准号: 245704921
• 负责人: Dr. Alexander Schmidt
• 金额: --
• 依托单位: Institut für Geowissenschaften
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/245704921?language=en
• 关键词: Alpine; metamorphism; Pan; African; gneiss

This study will investigate garnet bearing rocks from the southern Menderes massif in southwest Turkey utilizing the Lu-Hf and Sm-Nd isotope systems for geochronology. The study area comprises rocks of the Pan-African basement of west Turkey which have been overprinted by an Alpine metamorphic event. The timing is yet only inadequately constrained, and especially garnets have not been subject to geochronological work so far. Rock samples of the study area contain garnet crystals with sizes ranging from millimeter to several centimeters. Large, euhedral garnet crystals up to 5cm in diameter will be used for a micro-sampling approach to constrain beginning and duration of the garnet growth. Preliminary results reveal Lu-Hf ages of a garnet core of 60 Ma and a ~20 Ma younger rim. Micro-sampling and Lu-Hf + Sm-Nd geochronology of core and rim sections of selected large garnet crystals is the main topic of this study. These ages will help to constrain the complex metamorphic history of the Menderes Massif.

这项研究将利用Lu-HF和SM-ND同位素系统进行地年代学研究，研究土耳其西南部土耳其南部土地地块的石榴石轴承。研究区域包括西部土耳其泛非地下室的岩石，这些岩石被高山变质事件所覆盖。到目前为止，时机尚未受到不足的约束，尤其是石榴石尚未受到年代学工作的约束。研究区域的岩石样品包含石榴石晶体，尺寸从毫米到几厘米。直径高达5厘米的大型euhdral石榴石晶体将用于微采样方法，以限制石榴石生长的开始和持续时间。初步结果表明，石榴石芯的LU-HF年龄为60 mA和约20 mA年轻的边缘。核心的微采样和LU-HF + SM-ND地质学和选定大型石榴石晶体的边缘部分是本研究的主要主题。这些年龄将有助于限制修月度的复杂变质历史。