关于赣东北上墅组火山岩的再认识及其地质意义  

New Knowledge About The Volcanic Rocks of Shangshu Formation from Northeastern Jiangxi Province And Their Geological Significance

作　　者：李昌年[1] 廖群安[1] 

机构地区：[1]中国地质大学地球科学学院,武汉430074

出　　处：《地质论评》1999年第S1期717-723,共7页Geological Review

基　　金：国家计委遥感联测1:5万江西上绕八幅图区域地质调查项目资助

摘　　要：对与我国南方板溪群相当的赣东北上墅组火山岩进行地质学、岩石学、地球化学和定年研究。笔者提出该火山岩应划分为形成时代不同、岩石特征各异的两大类型:其一为红色陆相中、新元古代钙碱性中—高钾火山岩和碱性钾玄岩;其二为绿色海相早、中古生代拉斑玄武质低—中钾火山岩,赣东北地区原定的板溪群(古陆)应当解体,其中的红色陆相火山岩系为所谓的江南古陆的一部分,可与我国东南的板溪群相当;绿色的海相火山岩系则不属于板溪群,应从江南古陆中分解出来。This paper presents studies of geology, petrology, geochemistry and chronology for the Shangshu volcanic rocks that correspond to the Banxi Group in the Neoproterozoic. It is proposed that the volcanic rocks should be divided into two groups: the red continental calc-alkalic medium - to high-K volcanic rocks and alkaline shoshonite formed in the Meso—Neoproterozoic; and the green marine low- to medium-K tholeiitic volcanic rocks formed in the middle—early Palaeozoic. The authors consider that the Banxi Group of northeastern Jiangxi Province (the old land) should be broken up:the red continental volcanic rocks are part of the Jiangnan old land, corresponding to the Banxi Group; but the green marine volcanic rocks do not belong to the Banxi Group and must be separated from the Jiangnan old land.

关 键 词：上墅组 火山岩 板溪群 赣东北 

分 类 号：P588.14[天文地球—岩石学]