摘要:
在板块构造理论指导下,对天津市大地构造相进行了系统的划分,全面地总结了天津成矿地质构造环境。各种矿床都是在大地构造演化过程中的特定大地构造相环境下形成的特殊地质体,成矿作用过程与大地构造演化密切相关。研究表明古弧盆相中的新太古代角闪斜长片麻岩中含铁矿残留透镜体;大陆裂谷相的长城纪含有比较重要的非金属矿产陶瓷土矿和含钾泥岩等;稳定型陆表海相沉积的中-新元古代水泥石灰岩矿、锰(硼)矿、砖瓦用页岩矿、铁矿等;印支晚期板内造山岩浆杂岩有岩浆矿床磷,岩浆期后热液矿床钨、金、重晶石等,接触交代(矽卡岩)矿床有钼、硫铁及铜矿等金属矿产;新生代地层为坳陷盆地相碎屑岩沉积,富含有丰富的油页岩、石油等矿产。本次工作的目的就是研究各级大地构造相单元与成矿构造体系及成矿类型的关系,建立大地构造相与成矿作用的时空及岩石构造组合关系。
Abstract:
Under the guidance about theory of plate tectonics,the division of tectonic facies were made in Tian-jin, and mineralization geologic structure environment was comprehensively summarized also. All kinds of depos-its formed in the special geological process of geotectonic evolution under the specific tectonic facies environ-ment, the mineralization and the geotectonic evolution are the close correlations. The research show that Neoar-chean hornblende plagioclase gneiss formed in paleo-arc basins in which there is residual lenticle iron ore. In Changchengian period continental rift tectofacies contains very important non-metallic minerals such as potassi-um and shale. Meso-Neoproterozoic the stable epicontinental marine environment contains shale, iron, manga-nese, boron, cement, limestone and other minerals. In the later period of Indosinian the plate mountain building environment has the igneous complex forming phosphorus deposit. After magmatic time there are hydrothermal deposit gold, tungsten, lead, zinc and so on. The contact metasomatic deposit(skarn) has copper, molybdenum, py-rite and other metal minerals. Terrigenous clastic sediments in the Cenozoic period is rich in kerogen shale, oil and other minerals. The purpose of this work is to study the relationship between all kinds of tectonic facies unit and mineralization structural system, and mineralization type, and summarize the rule, establish tectonic facies and mineralization relationship between formation time and the combination of rock strata.