CAJ | 학술논문

通过对江西湖溪地区震旦纪地层中的花岗质糜棱岩进行野外和室内的综合研究表明，前人所称震旦系中的混合岩实际上为变形程度不同的花岗质糜棱岩。阴极发光图像显示锆石内部发育振荡环带，具有重熔再造岩浆成因的特征。采用LA-ICP-MS方法对其年代学进行限定，所获得的919 Ma年龄为古老基底残留锆石年龄，412±3 Ma年龄为岩浆形成年龄。岩体形成后可能先后经历了370±3 Ma B．P．和317±4 Ma B．P．两次隆升冷却。研究区广泛发育的走滑变形和花岗岩的糜棱岩化应当是发生于317±4 Ma B．P．之后。
통과대강서호계지구진단기지층중적화강질미릉암진행야외화실내적종합연구표명，전인소칭진단계중적혼합암실제상위변형정도불동적화강질미릉암。음겁발광도상현시고석내부발육진탕배대，구유중용재조암장성인적특정。채용LA-ICP-MS방법대기년대학진행한정，소획득적919 Ma년령위고로기저잔류고석년령，412±3 Ma년령위암장형성년령。암체형성후가능선후경력료370±3 Ma B．P．화317±4 Ma B．P．량차륭승냉각。연구구엄범발육적주활변형화화강암적미릉암화응당시발생우317±4 Ma B．P．지후。
LA-ICP-MS U-Th-Pb dating was employed in determining the age of granitic mylonites from Sinian in Huxi of Jiangxi Province.Based on the field investigation and experiment researches,the mylonites with different degrees of deformation in Sinian were misunderstood as migmatite by the predecessors.Cathodoluminescence indicates that the zircons in mylonites have obvious internal oscillation zones.These characteristics coincide with that of the remelting and reforming magma.The zircon age of 919 Ma represents that of the inherited zircon from the old basement and 412 ±3 Ma is the age of forming the magma.The pluton may have undergone another two processes of uplift and cooling at 370 ±3 Ma B.P.and 317 ±4 Ma B.P.,respectively.The widely developed strike-slip deformation and the mylonitization of the granites should occur after 317±4 Ma B.P.