长江中下游鄂-赣与苏-皖地区燕山期侵入岩地质特征及对比研究的开题报告

精品文档---下载后可任意编辑长江中下游鄂-赣与苏-皖地区燕山期侵入岩地质特征及对比讨论的开题报告摘要：长江中下游鄂-赣地区和苏-皖地区均具有燕山期侵入岩出露的特征，但二者的侵入岩类型和分布特点存在较大差异。本讨论旨在通过对比讨论，探讨该区域燕山期侵入岩地质特征及其可能的成因机制。本讨论采纳野外地质调查、室内岩石学、地球化学与年代学等方法，对比分析鄂-赣与苏-皖地区的侵入岩地质特征。结果表明，鄂-赣地区燕山期侵入岩主要为花岗岩和二长花岗岩，分布范围广，形成时代晚、侵位深度大；而苏-皖地区燕山期侵入岩则以花岗闪长岩为主，分布范围较小，形成时代早、侵位深度浅。同时，本讨论结合区域地质背景分析，讨论了区域构造背景和地质演化对燕山期侵入岩类型和分布特点的影响，并提出了可能的成因机制及其地质意义。关键词：长江中下游；燕山期；侵入岩；地质特征；成因机制Abstract：The E-G and S-W regions in the middle and lower reaches of the Yangtze River have the characteristics of Yanshanian intrusive rocks, but there are significant differences in the types and distribution characteristics of intrusive rocks between the two regions. The purpose of this study is to explore the geological characteristics and possible genetic mechanisms of the Yanshanian intrusive rocks in this area through comparative studies.Field geological survey, indoor petrology, geochemistry and geochronology were used in this study to compare and analyze the geological characteristics of the intrusive rocks in the E-G and S-W regions. The results show that the Yanshanian intrusive rocks in the E-G region are mainly granites and syenogranites, with a wide distribution range, a late formation age and a deep intrusion depth; while the Yanshanian intrusive rocks in the S-W region are mainly granite porphyries, with a small distribution range, an early formation age, and a shallow intrusion depth.精品文档---下载后可任意编辑In addition, this study discusses the influence of regional tectonic background and geological evolution on the types and distribution characteristics of Yanshanian intrusive rocks based on regional geological background analysis, and proposes possible genetic mechanisms and their geological significance.Keywords: middle and lower reaches of the Yangtze River; Yanshanian period; intrusive rocks; geological characteristics; genetic mechanisms.