CAJ | 학술논문

粤北地区广泛分布着石英脉型钨锡多金属矿床,根据围岩的差异可分为两类：一类以南雄县棉土窝钨矿床为代表,该矿床以寒武系砂岩地层、中粗粒花岗岩为成矿岩体围岩,以细粒花岗岩为成矿岩体,锆石U-Pb法测得细粒花岗岩的成岩年龄为153.82±0.96 Ma和146.95±0.84 Ma,辉钼矿Re-Os等时线法测得矿床的成矿年龄为150.5±1.4 Ma,黑云母Ar-Ar等时线法测得成矿年龄为151.0±1.2 Ma,从而得出棉土窝钨矿床的成矿时代为晚侏罗世,同时由于前人测得中粗粒花岗岩的年龄为230±2.3 Ma,属印支期,证明了印支期花岗岩也可作为石英脉型钨矿的围岩；另一类石英脉型钨矿床以乐昌禾尚田为代表。该矿床以泥盆系灰岩为围岩, Ar-Ar法测得其成矿年龄为161.1±1.1 Ma,证明其成矿时代也为晚侏罗世。这两类实例证明了粤北地区钨矿床与晚侏罗世侵入岩关系密切,印支期花岗岩与泥盆系灰岩中也可赋矿,这对该地区寻找类似钨矿床有重要的指导意义。
월북지구엄범분포착석영맥형오석다금속광상,근거위암적차이가분위량류：일류이남웅현면토와오광상위대표,해광상이한무계사암지층、중조립화강암위성광암체위암,이세립화강암위성광암체,고석U-Pb법측득세립화강암적성암년령위153.82±0.96 Ma화146.95±0.84 Ma,휘목광Re-Os등시선법측득광상적성광년령위150.5±1.4 Ma,흑운모Ar-Ar등시선법측득성광년령위151.0±1.2 Ma,종이득출면토와오광상적성광시대위만주라세,동시유우전인측득중조립화강암적년령위230±2.3 Ma,속인지기,증명료인지기화강암야가작위석영맥형오광적위암；령일류석영맥형오광상이악창화상전위대표。해광상이니분계회암위위암, Ar-Ar법측득기성광년령위161.1±1.1 Ma,증명기성광시대야위만주라세。저량류실예증명료월북지구오광상여만주라세침입암관계밀절,인지기화강암여니분계회암중야가부광,저대해지구심조유사오광상유중요적지도의의。
There are many quartz vein-type tungsten polymetallic ore deposits in northern Guangdong which can be divided into two types according to their wall rocks. One type of the ore deposits is hosted in the Cambrian sandstones and coarse-grained granite while the tungsten polymetallic mineralization is closely related to the fine-grained granite, which is represented by the Miantuwo tungsten deposit. The age of fine-grain granite is dated to be 146.95±0.84 Ma/153.82±0.96 Ma, using zircon U-Pb method, while the molybdenite Re-Os isochrone and biotite Ar-Ar isochrone are 150.5±1.4 Ma and 151.0±1.2 Ma respectively, and thus the Miantuwo deposit was formed in the Late Jurassic. The other type of the ore deposits is hosted in the Devonian limestones with the Heshangtian tungsten deposit as a representative. The after type of ore deposits is different from the one aforementioned. 39Ar/40Ar dating of the micas from the Heshantian deposit shows that the mineralization age is 161.1±1.1 Ma, i.e., the deposit was also formed in the Late Jurassic. That is the quartz vein tungsten ore deposits in northern Guangdong are closely related to the Late Jurassic granites. Indosinian granites and the Devonian limestones can be the country rocks of the ore veins in northern Guangdong, and therefore, attentions should be paid to above two types of country rocks in the future explorations.