辽宁省绥中县永安堡盆地火山活动旋回和火山构造特征  

Volcanic Activity Cycles and Volcanic Structure Characteristics of Yong'anpu Basin,Suizhong County,Liaoning Province

作　　者：张小勇 陈德兵[1] 宋鹏[1] 王庆喜[1] 李永红[1] ZHANG Xiaoyong;CHEN Debing;SONG Peng;WANG Qingxi;LI Yonghong(Institute of Nuclear Industry 240;China National Nuclear(Shenyang)Technology Co.,Ltd.)

机构地区：[1]核工业240研究所,辽宁省沈阳市沈北新区110135 [2]中核(沈阳)科技有限公司

出　　处：《现代矿业》2021年第6期41-45,共5页Modern Mining

摘　　要：永安堡盆地处于燕辽火山活动带,为中生代破火山口塌陷盆地。燕山晚期为该盆地最重要铀成矿期,这与义县期多阶段性火山活动关系密切。通过研究盆地火山活动的强度、周期性与间歇性、火山岩与沉积岩的组合特征以及盆地演化特征,将早白垩世义县期火山活动旋回划分为2个亚旋回和5个火山活动期次,火山机构类型为中心式破火山。以火山侵入相为中心,向外依次为火山碎屑溢流相、环状岩墙、喷发沉积相,表明龙门山和南背阴山破火山口边缘环状岩墙限定了火山活动产物的分布。近东西向基底断裂长期活化着深部岩浆活动,整体控制着盆地的演化及矿产分布。而破火山环状构造岩浆热液侵入频繁,主要为潜火山岩的规模产出提供便利通道。岩浆上侵过程中带入或活化围岩铀元素迁移富集,铀矿化展布特征基本与潜火山岩的分布规律一致。Yong'anpu Basin is located in the Yanliao volcanic activity zone,which is a Mesozoic caldera collapse basin.The late Yanshan period is the most important uranium mineralization period in the basin,which is closely related to the multi-stage volcanic activities in Yixian period.By studying the intensity,periodicity and intermittency of volcanic activity in the basin,the combination characteristics of volcanic rocks and sedimentary rocks,and the evolution characteristics of the basin,the volcanic activity cycles in the Yixian period of the Early Cretaceous are divided into two sub-cycles and five volcanic activity periods.The volcanic mechanism type is a central type of broken volcano.Taking volcanic intrusive facies as the center,the outward sequence is volcanic debris overflow facies,annular rock wall and eruption sedimentary facies,indicating that the annular rock wall at the edge of Longmenshan and Nanbeiyinshan crevasse limits the distribution of volcanic activity products.Near EW basement faults activated deep magmatic activity for a long time,and controlled the basin evolution and mineral distribution as a whole.The frequent intrusion of magmatic hydrothermal fluid in broken volcanic ring structure provides a convenient channel for the scale production of latent volcanic rocks.The migration and enrichment of uranium elements in the surrounding rock brought into or activated in the process of magma intrusion,and the distribution characteristics of uranium mineralization are basically consistent with the distribution law of latent volcanic rocks.

关 键 词：破火山口塌陷盆地 火山活动旋回 火山构造 铀矿化 

分 类 号：P317[天文地球—固体地球物理学]