CAJ | 학술논문

南岭地区是我国花岗岩型铀矿的重要矿集区。该区产铀岩体的成因类型以S型(改造型)花岗岩为主，对岩性没有明显的选择性。构造是控制铀成矿的重要因素之一，几乎所有热液铀矿体都分布在一定的断裂或破碎构造中，并且与穿切于花岗岩中的中基性岩脉密切相伴。产铀岩体的热液蚀变发育，规模大、范围广、类型全的热液蚀变是判别产铀岩体的重要标志。产铀岩体的主要成岩时代为印支期和燕山期，铀成矿作用则主要发生于燕山晚期-喜山期，成岩成矿具有明显的时差，指示成岩和成矿作用是两次或两次以上不同的地质作用。印支期和燕山期花岗岩主要提供成矿铀源和成矿围岩，而铀矿成矿作用与燕山晚期-喜山期伸展断裂构造和蚀变交代的关系更为密切。对于南岭地区的花岗岩型铀矿，燕山晚期-喜山期的伸展构造活动及其伴随的中基性-酸性岩浆活动比印支期-燕山期的花岗岩更具有成矿专属性。
남령지구시아국화강암형유광적중요광집구。해구산유암체적성인류형이S형(개조형)화강암위주，대암성몰유명현적선택성。구조시공제유성광적중요인소지일，궤호소유열액유광체도분포재일정적단렬혹파쇄구조중，병차여천절우화강암중적중기성암맥밀절상반。산유암체적열액식변발육，규모대、범위엄、류형전적열액식변시판별산유암체적중요표지。산유암체적주요성암시대위인지기화연산기，유성광작용칙주요발생우연산만기-희산기，성암성광구유명현적시차，지시성암화성광작용시량차혹량차이상불동적지질작용。인지기화연산기화강암주요제공성광유원화성광위암，이유광성광작용여연산만기-희산기신전단렬구조화식변교대적관계경위밀절。대우남령지구적화강암형유광，연산만기-희산기적신전구조활동급기반수적중기성-산성암장활동비인지기-연산기적화강암경구유성광전속성。
The Nanling region is an important area of granite-hosted uranium deposit cluster in China. The genetic type of the uranium-bearing granites is mainly of S type (reworking type) granite without lithology preference. Regional tectonics is one of the key factors controlling uranium mineralization, almost all of the hydrothermal uranium ore bodies occur in faults or fracture zones, and spatially associated with medium-mafic dikes that intrude into the granites. The uranium-bearing granites are characterized by pervasice and intensive hydrothermal alteration of diverse types. The formation times of the uranium-bearing granites are mainly Indosinian and Yanshanian, however, the mineralization times of uranium are mainly late Yanshanian and Himalayan, thus there is significant time difference between granite formation and uranium mineralization, which indicates that the granite formation and uranium mineralization are of two or more different geological processes. Granites of Indosinian and Yanshanian are the main source and wall-rock for the uranium mineralization, while the uranium mineralization is closely associated with extensional fault structures and alteration of the late Yanshanian and Himalayan. Thus, for the granite-hosted uranium deposits in the Nanling region, the extensional faults and accompanying medium-mafic magmatism and the late Yanshanian and Himalayan alteration have more metallogenic specialization than the Indosinian and Yanshanian granites themselves.