项目名称: 哀牢山新元古代岩浆作用及其动力学机制
项目编号: No.41502180
项目类型: 青年科学基金项目
立项/批准年度: 2016
项目学科: 天文学、地球科学
项目作者: 蔡永丰
作者单位: 桂林理工大学
项目金额: 21万元
中文摘要: 华南前寒武纪地质是当今国内外研究的热点与前沿。近二十年来的研究表明扬子板块西缘、北缘和东缘均广泛存在新元古代岩浆作用,然而对扬子板块西南缘前寒武纪地质演化极少关注。哀牢山构造带位于扬子板块西南缘,带内保存有众多前寒武系地层和不同时期、不同类型的岩石组合,是研究扬子板块西南缘新元古代岩浆作用的理想场所。基于此,本项目拟以在哀牢山构造带甄别出的基性-中性-酸性岩浆岩组合为切入点,以详细的野外地质、岩石(相)学、矿物/岩石化学、同位素年代学和元素-同位素地球化学为主要研究手段,多学科交叉综合研究哀牢山构造带新元古代岩浆作用记录并获取系统配套的地球化学数据,解析不同类型岩石的精细年代学、地球化学、岩石成因、构造属性及其相互关系,综合剖析该套岩石组合所蕴含的大地构造意义,为华南大陆前寒武纪演化及其与罗迪尼亚超大陆关系的深入研究提供突破性资料。
中文关键词: 新元古代;岩浆作用;哀牢山构造带;动力学机制
英文摘要: Precambrian geology plays an important role to reveal the crustal formation, evolution and geodynamic process. Precambrian lithostratigraphy, palaeobios and mineral resources are widely distributed in and along the Yangtze Block, which provide an ideal opportunity for understanding the earlier crustal evolution and metallogenic mechanism of the South China Block. The Ailaoshan tectonic zone in Yunnan Province, located at the southwestern Yangtze Block, is a WNW-trending metamorphic belt with the length of more than 1000 km. It contains numerous Precambrian igneous rocks that provide a good “window” for discussing the crustal evolution and geodynamic process of the SW Yangtze Block. In this project, petrological, mineralogical, zircon U–Pb geochronological and Hf isotopic data, along with whole rock major oxides, elemental and Sr-Nd-Pb-Os isotopic results on the igneous rocks in the Ailaoshan tectonic zone will be carried out to better constrain their petrogenesis and tectonic setting in the southwestern Yangtze Block and their palaeogeography position in Rodinia supercontinent during Neoproterozoic.
英文关键词: Neoproterozoic;Magmatism;Ailaoshan tectonic zone;Dynamic mechanism