内蒙古白乃庙地区铜(金)和金矿床钕、锶和铅同位素研究

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内自古白乃庙地区产出有白乃庙铜(金)矿床(南、北矿带)、白乃庙金矿床和徐尼乌苏金矿化带,是华北陆台北缘金属成矿带的重要组成部分。笔者测定和解释了上述三个矿床的钕、锶和铅同位素比值和变化特征。研究认为:白乃庙铜(金)矿床南、北矿带在成矿时代、成矿物质来源和形皮过程方面存在明显差异,南矿带条带状、块状硫化物矿石的形成作用始于1130×10 ̄6a前的基性火山喷发活动。相比之下,北矿带细脉浸染状和脉状铜-钼-金矿石与加里东期(440×10 ̄6a)花岗闪长斑岩的侵位和结晶分异密切相关。白乃庙金矿床和徐尼乌苏金矿化带是岩浆热液、大气降水混合,并且对基底岩层或绿片岩围岩进行淋滤、萃取的结果。白乃庙地区铜(金)矿床和金矿床(点)成矿物质来源和形成机制的厘定,对于了解华北地台北缘内蒙古中南段金属成矿带的形成与演化具有重要意义。 Within the ancient Bai Naimiao area, there are the Bai Nai Miao copper (gold) deposits (south and north ore deposits), the Bai Niaomiao gold deposit and the Xu Niusu gold deposit, which are the metallogenic belt in the northern margin of the Lvtai of North China An important part of. The authors measured and explained the isotopic ratios and variations of neodymium, strontium and lead in the three deposits. The study shows that there are obvious differences in mineralization source and formation process between the southern and northern oreblocks in the southern and northern oreblocks of the Bai’NaiMiao copper (gold) deposit. The formation of banded and massive sulphide ores in the southern ore belt began Basic volcanic eruptions occurred before 1130 × 10 ~ 6a. In contrast, the intrusive and crystalline differentiation of veinlets and vein-like copper-molybdenum-gold ores in the northern ore belt is closely related to emplacement and crystallization of the granitic dioritic porphyry in the Caledonian period (440 × 10-6a). The Bainaimiao gold deposit and the Xuyivusujin gold belt are the result of leaching and extracting the magma hydrothermal fluid and the atmospheric precipitation mixed with the basement rock or the smectite surrounding rock. It is of great significance to understand the source and formation mechanism of the ore-forming materials of the copper (gold) deposit and gold deposit (point) in the Bai Niaomiao area and to understand the formation and evolution of the metallogenic belt in the central-southern part of Inner Mongolia of North China.
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