摘要
河南豫西中元古界熊耳群火山岩系广泛分布,且遭受多次构造活动、岩浆侵入及剥蚀的影响。在汝阳一带依据岩石中残留的原生构造、古断裂构造、岩石学和岩相学标志、岩层产状及地貌形态等特征识别出高水泉、关家、草立扒、十八盘、双园沟等一系列古火山口。火山活动早期为NEE向裂隙式喷溢,中期演化为中心式喷发、伴有裂隙式喷发,晚期为中心式喷发。区域火山活动贯穿整个熊耳期,时间自NE向SW由早到晚。古火山口及受其控制的次火山岩为区域找矿信息。
Volcanic rocks are widespread in the Mesoproterozoic Xiong＇er Group in western Henan and have undergone repeated structural activities, magmatic intrusion and erosion. On the basis of the remaining primary structures of rocks, paleo-faults and petrological and petrographic indicators, attitude of strata and geomorphologic features, a series of paleovolcanic craters, such as the Gaoshuiquan, Guanjia, Caoliba, Shibapan and Shuangyuangou paleovolcanic craters, have been identified in the Ruyang area. The early-stage paleovolcanism was marked by NEE-trending fissure-type outpouring, the middle-stage paleovolcanism evolved into central eruption, accompanied by fissure eruption, and the late-stage paleovolcanism was manifested by central eruption. Regional volcanism occurred throughout the Xiong＇er period and from NE to SW with time. The paleovolcanic craters and the subvolcanic rocks controlled by the paleovolcanic edifices provide regional ore search information.
出处
《中国地质》
CAS
CSCD
2007年第2期300-305,共6页
Geology in China
基金
河南省地质矿产厅地质调查项目(豫第字261号1999)。
关键词
汝阳
熊耳群
古火山机构
找矿信息
Ruyang
Xiong＇er Group
paleovolcanic edifice
ore search information
