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东窝东铜多金属矿床位于羌塘地体南缘,多龙铜金矿集区东侧。该矿床尚未开展矿化蚀变时限、成矿作用中元素迁移特征等问题的研究。为确定矿床的蚀变矿化作用时限,本文对东窝东矿床的黄铁绢英岩化蚀变带中的蚀变绢云母进行了~(40)Ar-~(39)Ar年代学测试,获得~(40)Ar-~(39)Ar坪年龄为122.20±0.84 Ma,该年龄与已有的斑岩体侵位时代(122 Ma)一致,说明东窝东矿床黄铁绢英岩化蚀变与斑岩体侵位有密切联系。此外,对比分析地表弱蚀变和钻孔中强黄铁绢英岩化花岗闪长斑岩的岩石地球化学结果,运用“等浓度线(isocon)方程”及其推导方程,探讨黄铁绢英岩化蚀变过程中的不同元素的带入、带出特点及元素迁移特征。结果表明:高场强元素质量基本守恒;轻稀土元素较重稀土元素迁移量较大,但总体上稀土元素的迁移程度较弱;主要的成矿元素Cu、Pb、Zn为带入元素。东窝东矿床含矿斑岩侵位时代和热液蚀变时限均与多龙矿集区内多不杂、波龙、铁格隆南等多个超大型-大型铜金矿床一致,说明东窝东矿床和多龙矿集区内的多个矿床受控于同一构造-岩浆成矿背景,东窝东矿区具有重要的找矿潜力。
Dongwo East copper polymetallic deposits located in the southern margin of Qiangtang terrane, Duolong copper gold deposits east of the area. The deposit has not yet been carried out mineralization alteration time limit, elemental migration characteristics of mineralization and other issues. In order to determine the alteration mineralization time limit of ore deposits, the ~ (40) Ar- ~ (39) Ar geochronological tests of altered sericite in the alteration zone of the Zhoushundong gold deposit were carried out. (40) Ar- ~ (39) Ar plateau is 122.20 ± 0.84 Ma, which is consistent with the age of the existing porphyry emplacement (122 Ma), indicating that the alteration of yellow iron siliceous rocks and porphyry Ectopic invasion is closely linked. In addition, the geochemical results of weak alteration and strong-grained sinonite-hosted granodiorite porphyry in the surface were compared and analyzed. The “isocon equation” and its derivation equation were used to investigate the relationship between pyrite The different elements in the process of bringing in, bring out the characteristics and elements of migration characteristics. The results show that the mass of high-field-strength elements is basically conserved, while that of heavy rare-earth elements is relatively large. However, the migration of rare-earth elements is generally weak. The main elements of ore-forming are Cu, Pb and Zn. The ore-bearing porphyry emplacement age and hydrothermal alteration time of Dongwoodong ore deposit are consistent with those of multi-mineral deposits in the Duolong ore district, and many super-large-scale copper-gold deposits in the Panglong and the Tiegulongnan. Many deposits in the Woodong deposit and the Duolong mining area are controlled by the same tectonic-magmatic metallogenic background, and the Dongwoodong deposit has important prospecting potential.