冀西北崇礼-赤城含金剪切带成矿机制

在印支末-燕山期，冀西北地区遭受了强烈的韧性剪切变形和复杂的碱交代作用，逐步演化出各种糜棱岩→碱交代杂岩以及东坪、黄土梁、小营盘等几十处石英脉-钾质蚀变岩型金矿床，构成独持的崇礼-赤城含金剪切带。绿岩地体的含金性、强烈的韧性剪切变形及其韧性-韧脆性-脆性演化过程是金矿形成的前提，而伴随剪切变形演化出现的多期次含金富碱热流体面型-裂隙型碱交代作用是金矿形成的关键。

THE MECHANISM OF MINERALIZATION IN CHONGLI－CHICHENG GOLD－BEARING SHEAR BELT，NORTHWEST OF HEBEI PROVINCE

The unique gold－bearing shear belt is well developed in Northwest Hebei．The inten-sive ductile shearing deformation and complicated alkali metasomatism are well developedduring Indosinian－Yanshanian period．The mylonites and alkali metasomatic complex aswell as different gold deposits are the terminal evolution result of the shearing deformationand alkali metasomatism， The high Au element background in the greenstone and the inten-sive ductile shearing deformation as well as the evolution are the basis of gold concentration，the multiple dimensional－fracture type alkali metasomatism of gold－bearing and alkali－riched hydrothermal fluid which was associated with the deformation evolution from ductileto brittle is the key processes for ore－forming.