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目前,为加强老地层的区域成矿作用和成矿预测的研究,正在全面开展对前震旦地层中铀和钍元素背景含量区调测量以及对这些地层含铀性的评价。为此,我们提出应用基性岩脉增值S_u对五台、吕梁和中条等地区的前震旦地层的含铀性进行评价。经三个月的野外实地考查,采集了九条有基性岩脉的地层剖面地质资料和分析了98个天然露头的铀及钍元素含量,提出了两个地区中三个有利的铀源层位。一、应用增值S_u的理论依据和前提岩脉是地壳深部岩浆侵入地表后冷却的产物。岩浆上升运移中不断地熔融(或部分熔融)围岩,并从围岩中俘获铀(或钍)元素。当岩浆携带热量相当大,并且同围岩接触面积
At present, in order to study the regional metallogenetic effects and metallogenic prognosis in the old strata, the adjustment of uranium and thorium background content in the pre-Sinian strata and the evaluation of their uranium-containing properties are under way. Therefore, we propose to evaluate the uranium content of pre-Sinian strata in Wutai, Luliang and Zhongjian areas by using the value-added S_u of basic dikes. After three months field investigation, the geological data of nine basic lithofacies stratigraphic sections were collected and the uranium and thorium contents of 98 natural outcrops were analyzed. Three favorable uranium source beds in two regions were proposed . First, the application of value-added S_u theoretical basis and prerequisite dikes is the deep crustal magma invaded the ground after the cooling product. The magma continuously melts (or partially melts) the surrounding rock in the ascent and descent and traps uranium (or thorium) elements from the surrounding rock. When the magma carries a considerable amount of heat, and with the surrounding rock contact area