煤田推覆构造地球化学特征初探

RESEARCH ON CHARACTERISTICS OF OVERTHRUST GEOCHEMISTRY OF COALFIELDS

化学元素的迁移和富集可以指示断裂运动的性质。根据断裂带内的元素和地球化学作用变化规律的研究,就可能测定断裂运动的特征。对安徽淮南和淮北地区推覆构造断裂带的地球化学特征的研究,说明离子半径小、比重较大的元素(如Si、Mg、Al、Ca等)富集于压性或压—剪性断裂带内,而离子半径较大、比重较小的元素(如K、Na、Fe等)则由该帶逸散。同时还研究了断裂带运动过程中地球化学作用的机理。

Migration and accumulation of chemical elements may be as a showing of nature of fault movement.According to study on changing law of elements and geochemical actions in a fault zone,evidence to determine character of the fault movement might be gotten.The author has studied the geochemical characteristics of the fault zones of overthrusts in areas of Huainai and Huaibei of Anhui province and shown the fact that elements(such as Si,Mg,Al,Ca,etc)with less ion radii and larger specific gravity accumulated in pressure or pressure—shear fault zones and elements(such as K,Na,Fe,etc)with larger ion radii and less specific gravity escaped from the zones.The geochemical actions in the movement process of the fault zones has also been studied in the paper.