论文部分内容阅读
省内侏罗—白垩系火山岩多以中小型火山盆地产出,岩性变化复杂,特别是南北两地区火山岩组合及成矿专属性的不同,日益引起地质工作者的注视。本文试图通过火山岩岩石化学的研究,以揭示区内火山岩形成时的构造环境,岩浆的发生及其演化。由于水平有限,不妥之处请批评指正。一、地质背景和火山活动特征本地区地处太平洋与欧亚地块交会地带。印支运动是区内地史上一次变革性运动,它结束了区内海侵历史,在运动性质上也由褶皱和凹陷向断裂和隆起演化。燕山运动以明显
Most Jurassic-Cretaceous volcanic rocks in the province are mostly produced in small and medium-sized volcanic basins, and their lithology changes are complicated. Especially, volcanic rock assemblages and ore-forming specialties in the two regions are different, and geologic workers are increasingly paying attention. This paper attempts to study the volcanic petrochemistry to reveal the tectonic setting, magmatic occurrence and evolution of volcanic rocks in the area. Due to the limited level, please correct me wrong. First, the geological background and characteristics of volcanic activity The region is located in the Pacific Ocean and Eurasian land mass meeting zone. The Indo-Chinese Movement is a transformative movement in the history of the interior region. It ended the history of transgression in the region and evolved from folds and depressions into faults and upheaval on the movement. Yanshan movement to obvious