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长坑金银矿是新近发现的新型大型贵金属矿床 .较系统的N2 Ar He示踪体系、He和δD δ18O同位素组成研究表明 ,该矿床成矿流体主要来源于建造水 (或称沉积热卤水 ) ,而不是前人所普遍认为的大气降水 .成矿流体中幔源岩浆水的比例也很低 ,一般不超过 1 0 % .根据成矿流体来源 ,长坑金银矿应属沉积热卤水改造型矿床 .在晚侏罗世到早白垩世 ,粤中三洲盆地由于巨厚沉积物的积聚 ,其中建造水受到挤压加温 ,顺层侧向迁移 ,并最终沿盆地边缘缓倾斜的层间断裂向上运移 ,由于温、压下降等原因导致矿质在断裂中沉淀 .
The Changkeng gold-silver deposit is a newly discovered large-scale noble metal deposit.The systematic study of He and δD δ18O isotopic composition of the more systematic N2 Ar He tracer system indicates that the ore-forming fluid of this deposit mainly comes from the construction water (or deposition of hot brine) , Rather than the prejudice of atmospheric precipitation.Materal mantle-derived magmatic water in the ore-forming fluid is also very low, generally less than 10% .According to the origin of ore-forming fluid, Changkeng gold and silver mine should be rebuilt by sedimentary hot brine Type deposits.During the Late Jurassic to Early Cretaceous, due to the accumulation of thick sediments in the Three Gorges basin of Guangdong, the water of construction was squeezed and warmed, migrated laterally and finally gently geosynthesized along the margin of the basin Faults migrate upward, due to temperature, pressure drop and other causes of mineral precipitation in the fracture.