下庄北部长英质火山岩地球化学特征及成因

Geochemical Characteristics and Genesis of Felsic Volcanic Rocks in the North of Xiazhuang

分析测定了下庄铀矿田北部中生代长英质火山岩主元素、微量元素、稀土元素,得出结论:下庄矿田北部中生代长英质火山岩由钙碱性系列碎斑熔岩组成;下庄矿田北部中生代长英质火山岩经历了不同程度的斜长石分离结晶作用或在部分熔融过程中斜长石残留的比例不同,物质来源于上地壳,是较高水逸度、较低温度条件下变质沉积岩部分熔融的产物。

The major elements, trace elements, REE elements on the felsic volcanic rocks of late Mesozoic in the north of Xiazhuang uranium ore field were tested and analyzed, a conclusion was drew： the Mesozoic felsic volcanic rocks consisted of porphyroclastie lava of eale - alkaline rock series in the north of Xiazhuang uranium ore field; the Mesozoic felsie volcanic rocks experienced different separate crystallization or the plagioclase rudimental ratios is different during partial melt in the north of Xiazhuang uranium ore field, the substance of the felsie volcanic rocks was from the upper earth crust, and it maybe a production of partial malting of metamorphic sedimentary rocks under lower temperature and higher water fugacity condition.