CAJ | 학술논문

通过对广东省博罗县横河超大型钠长石矿床、锡铌钽矿化带和金矿化带野外勘查和室内微观分析,发现岩浆随着构造演化而分异自交代成矿的特殊新颖现象.研究表明该矿区在不同的构造旋回中构造应力场的主压应力方向不同,持续构造压应力作用下发生不同构造序次,岩浆也随构造应力场的演化而分异.燕山构造旋回控制的早期第三阶段岩浆,结晶分异和气液分异导致强烈岩浆自交代形成超大型钠长石矿床;燕山构造旋回控制的晚期岩浆,随着构造演化产生云英岩化、石榴子石化等岩浆自交代而锡铌钽矿物结晶富集成矿;燕山构造旋回最晚期的北北西向、北北东向、北西向断裂,控制岩浆热液期的金矿化带.即本矿区经构造岩浆演化分异,发生岩浆自交代至热液蚀变演化系列成矿机理.
통과대광동성박라현횡하초대형납장석광상、석니단광화대화금광화대야외감사화실내미관분석,발현암장수착구조연화이분이자교대성광적특수신영현상.연구표명해광구재불동적구조선회중구조응력장적주압응력방향불동,지속구조압응력작용하발생불동구조서차,암장야수구조응력장적연화이분이.연산구조선회공제적조기제삼계단암장,결정분이화기액분이도치강렬암장자교대형성초대형납장석광상;연산구조선회공제적만기암장,수착구조연화산생운영암화、석류자석화등암장자교대이석니단광물결정부집성광;연산구조선회최만기적북북서향、북북동향、북서향단렬,공제암장열액기적금광화대.즉본광구경구조암장연화분이,발생암장자교대지열액식변연화계렬성광궤리.
Based on the field exploration and indoor microscopic analysis of a superlarge albite deposit, mineralized zones of Sn-Nb-Ta and Au in Boluo County of Guangdong Province, a new kind of special phenomenon that differentiation and autometasomatism of magma occurs along with tectonic evolution, has been discoveried. Researches indicate that the orefield's principal compressive stress direction of tectonic stress field in the orefield is not identical in different tectonic cycles, and it contains various tectonic orders under a continuous tectonic compressive stress, meanwhile magma differentiates along with the stress field evolution. Autometasomatism emerged from the 3rd Yanshanian magmas in early phases and formed a superlarge albite deposit by way of crystallization and pneumohydraulic differentiation. The Yanshanian magmas in late phases, gave rise to sericitization and garnetization, and then Sn, Nb and Ta were enriched due to magmatic-authometasomatism. Yanshanian NNW, NNE and NW faults, control mineralized zones of Au in the magmatic hydrothermal stage. In a word, the mine was formed with evolution and differentiation of tectonomagmatism, the mechanism of mineralization and evolutional series from magmatic autometasomatism to hydrothermal alternation have been determinated.