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浅成低温热液系统可能是深部斑岩成矿系统的表征。在澜沧裂谷,喜山期花岗斑岩隐伏侵入裂谷中部下石炭统依柳组玄武质火山岩地层,形成了与老厂大型钼铜银铅锌多金属矿床有关的斑岩-夕卡岩型热液蚀变体系,在浅表的碳酸盐岩地层中则形成脉状银铅锌矿化。裂谷西部的大黑山勘查区下石炭统地层为南段组碎屑岩,深部隐伏的花岗斑岩可能形成不同于老厂的热液蚀变体系,对大黑山勘查区一个综合垂直剖面的初步研究表明:(1)深部热液体系在南段组中以形成具有明显Eu正异常(δEu=1.58)的石英网脉为特征,并且具有与老厂蚀变斑岩相似的Pb-Bi-Ag-Zn-Cu富集模式但Mo明显亏损,暗示深部可能存在与老厂矿区相同的花岗斑岩及Mo的矿化。(2)深部热液体系在C_(1n)/C_(2+3)岩性界面与低温天水系统混合,在C_(2+3)白云岩中形成具有突出Eu正异常(δEu最高达5.71)的铁锰方解石化,并在近40 m的蚀变带内显示出Pb-Zn-Ag矿化异常;蚀变过程中Mg的带出与Ca-Fe-Mn的带入具有良好的相关性,并形成继续向上运移的低温Mg-Mn热液。(3)低温Mg-Mn热液在上覆二叠系生物碎屑灰岩中形成热液角砾白云岩化蚀变,大黑山勘查区地表以线型正地形的黑山梁子为代表;热液角砾白云岩化表现为弱的Eu正异常、Sr-U明显亏损和强烈的Mn富集,是地表锰银矿化的重要物源。大黑山综合剖面的研究确证了地表灰岩中广泛存在的各种形式的热液角砾白云岩化是深部岩浆热液活动的具体体现,是非常有利的找矿标志。
The epithermal system may be the representation of the deep porphyry metallogenic system. In the Lancang rift, the Himalayan granite porphyry intruded into the Lower Carboniferous basaltic volcanic rocks of the Lower Carboniferous in the middle rift of the rift to form the porphyry-skarn associated with the old molybdenum-copper-silver-silver-zinc-zinc polymetallic deposit Hydrothermal alteration system forms vein-like silver-lead-zinc mineralization in superficial carbonate layers. The Lower Carboniferous strata in the western Great Cretaceous exploration area of the rift are clastic rocks of the southern segment. The deep concealed granite porphyry may form a hydrothermal alteration system different from that of the old plant. A comprehensive vertical section Preliminary studies show that: (1) Deep hydrothermal system is characterized by the formation of quartz network veins with obvious Eu anomaly (δEu = 1.58) in the southern section, and Pb-Bi- The Ag-Zn-Cu enrichment model, however, shows a significant loss of Mo, suggesting that there may be mineralization of the same granite porphyry and Mo as in the Laochang mining area. (2) The deep hydrothermal system is mixed with the low temperature Tianshui system at the C_ (1n) / C_ (2 + 3) lithological interface and the Eu positive anomalies with the prominent δEu up to 5.71 in the C_ (2 + 3) , And showed Pb-Zn-Ag mineralization anomaly in the alteration zone of nearly 40 m. The Mg carried out during the alteration showed a good correlation with the Ca-Fe-Mn incorporation, And form a low-temperature Mg-Mn hydrothermal solution that continues to migrate upward. (3) Low-temperature Mg-Mn hydrothermal formed hydrothermal brecciated dolomitization alteration in the overlying Permian bioclastic limestone. The surface of Daheishan prospecting area is represented by the black-shaped mountain with linear positive terrain. Hydrothermal fluid The brecciated dolomitization is characterized by weak Eu positive anomaly, obvious depletion of Sr-U and strong enrichment of Mn, which are important source of manganese and silver mineralization on the surface. The study of the integrated profile of the Greater Montenegro confirms that various forms of hydrothermal breccia dolomitization widely present in the surface limestone are the concrete manifestation of the deep magmatic hydrothermal activity and are very favorable prospecting indicators.