河北省灵寿阜平接壤地带麻棚金矿田的地球化学特征及矿床成因

GEOCHEMICAL CHARACTERISTICS AND GENESIS OF MAPENG GOLDFIELD BORDERING LINGSHOU AND FUPING, HEBEI, CHINA

麻棚金矿田位于晚侏罗世麻棚岩体东南侧及新太古代叠加生成的穹盆褶皱区东缘的中太古代阜平（超）群团泊口组内。金矿石两组全岩Ｐｂ－Ｐｂ等时线年龄分别与变质围岩的主要叠加变质变形年龄和麻棚岩体的生成年龄相同或相近。对相关岩石的金丰度值、溶矿试验、稀土元素、稳定同位素的研究表明，团泊口组的角闪质岩石属于矿源岩，区域变质作用、再生交代型混合岩化作用、尤其是晚侏罗世深成岩浆的活动导致金的多次富集成矿。

The Mapeng goldfield occurs in the Tuanbokou Formation of the middle Archean Fuping Group, which is located to southeast of the Mapeng intrusion and borderson east a late Archean dome-basin fold region. Two Pb-Pb ages of the ores are consistent with the main deformation age of the metamorphic country rocks and the formation age of the Mapeng intrusion. Study on gold abundance, REE, stable isotopes and ore-dissolution test of the relative rocks shows that the Tuanbokou Formation amphibolitic rocks are the source rock, and that regional metamorphism, regenerated-metasomatic migmatization, especially the late Jurassic deep-seated magmatic activity, led to the multi-stage mineralization of gold.