Metamorphic evolution of gneisses and eclogites along a cross section through the cold and hot eclogite terrane of the Dabie Shan, Central China

华中大别山冷热榴辉岩地体剖面上片麻岩和榴辉岩的变质演化

• 批准号: 5160168
• 负责人: Professor Dr. Hans-Joachim Massonne
• 金额: --
• 依托单位: Institut für Mineralogie und Kristallchemie (IMi) (aufgelöst)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 1999
• 资助国家: 德国
• 起止时间: 1998-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5160168?language=en
• 关键词: Metamorphic; evolution; gneisses; eclogites; along

The collision between the Yangtze Craton and the Sino-Korean Craton in the Early Mesozoic resulted after erosion in surficially exposed UHPM rocks indicated, so far, by coesite and/or diamond. The widerspread occurrence of such rocks in the DabieTongbai Mountains and the Jiangsu-Shandong Province (Su-Lu) offers an worldwide almost unique situation to study processes related to deep orogenic roots during continent-continent collision. In a selected area of the Dabie Shan, mainly along a profile in N-S direction, eclogites, ultrabasic and calcsilicate rocks, that are encloses as lenses in gneisses and micaschists, and the country rocks themselves, should be carefully sampled. These rocks are the target of our petrologic research which will mainly include detailed microanalytical investigations with the electron microprobe. Furthermore, it ist intended to use LA-ICP-MS to determine with a minimal site solution trace elements in mineral phases like garnet, phengiet, biotite and/or kyanite. New thermobarometers including that already are being calibrated in Stuttgart, are to be applied to trace elements (e.g. P, Ti, Y, and Zr) of mineral phases. These new methods should result in much more detailed P-T-paths than derived so far. The PT-path derivation that are planned, should be an important contribution to the enlightenment of the geodynamic evolution of the collision orogen and thus will help to understand processes at deep orogenic roots.

早中生代扬子克拉通与中朝克拉通的碰撞是由地表暴露的UHPM岩石的侵蚀造成的，迄今为止，地表暴露的UHPM岩石被钴矿和（或）钻石所侵蚀。这类岩石在大别通白山和苏鲁地区的广泛分布，为研究大陆碰撞过程中与深部造山根有关的过程提供了一个在世界范围内几乎独一无二的条件。在大别山选定区域，主要沿南北向剖面，仔细取样片麻岩和云母岩中作为透镜体包裹的榴辉岩、超基性和钙硅酸盐岩石，以及岩石本身。这些岩石是我们岩石学研究的目标，主要包括用电子探针进行详细的微观分析研究。此外，它还打算使用LA-ICP-MS以最小的位点溶液测定矿物相中的微量元素，如石榴石、白长石、黑云母和/或蓝晶石。新的温度计，包括已经在斯图加特校准的温度计，将应用于矿物相的微量元素（如P， Ti， Y和Zr）。这些新方法将产生比目前推导的更详细的p - t路径。规划的pt路径推导将对碰撞造山带地球动力学演化的启示作出重要贡献，从而有助于了解造山带深部的过程。