摘要
辽东后仙峪硼矿床含硼岩系中产出有电英岩,与硼矿床的形成有密切关系。岩石学和地球化学等研究发现矿区内电英岩呈层状分布于硼矿体的顶、底板,常夹于变粒岩层中,具完好的条纹条带状构造;在判别硅质岩成因的TiO2--A l2O3和(K2O+Na2O)--A l2O3二元图解上,投影点均落在海底热水沉积硅质岩区;δEu和δCe均为中等程度的负异常,经北美页岩标准化后的稀土元素配分曲线左倾明显,这些特征表明后仙峪硼矿床含硼岩系中的电英岩为热水沉积岩,与其关系密切的后仙峪硼矿床为热水喷流沉积硼矿床。
Research on petrology and geochemistry for the tourmalite in the studied area shows that the tourmalite occurred extensively in boron-bearing rock series,which was closely related to borate bodies.The layered tourmalite was distributed above or below ore beds,interbedding granulitite with perfect striatus in structure.On the TiO2-Al2O3 and（K2O＋Na2O）-Al2O3 diagrams for discriminating silicalite in genetic type,the composition points of tourmalite are plotted within the area of seabed silicalite in hot-water deposit.Both δEu and δCe appear as moderate negative anomalies,and the REE curves normalized by North American shale decline left obviously.It is suggested that the tourmalite belongs to exhalite,indicating the borate deposit closely related to tourmalite is exhalative sedimentary deposit.
出处
《世界地质》
CAS
CSCD
2008年第3期260-266,共7页
World Geology
基金
中国地质调查局地质调查项目"新疆-青海东昆仑成矿带成矿规律和找矿方向综合研究"(200110200021)
"东昆仑成矿带重大找矿疑难问题研究"(200310200012)联合资助
关键词
电英岩
热水沉积岩
硼矿床
辽东
后仙峪
tourmalite
exhalite
borate deposit
eastern Liaoning
Houxianyu
