萨热克砂砾岩型铜矿成矿物质来源与隐伏基底顶面形态控矿特征

发布时间：2018-05-26 13:45

本文选题：苏鲁铁热克隆起 + 拉分盆地　；参考：《矿物学报》2017年05期

【摘要】：塔西地区萨热克砂砾岩型铜多金属矿床位于塔拉斯-费尔干纳北西向右旋走滑断裂带、萨瓦亚尔顿-吉根左旋走滑逆冲断裂带、帕米尔冲断褶皱前锋带构成的三角区的中心部位,苏鲁铁热克断隆区北侧的中生代巴依次级拉分断陷盆地中。围绕苏鲁铁热克隆起带分布大量的中新生代砂砾岩型铜铅锌矿床,显示该隆起带对砂砾岩型铜铅锌矿床具有重要的控制作用。萨热克铜矿区主要地层岩矿石的微量元素和稀土元素地球化学特征,显示成矿物质来源主要来自于基底隆起区的剥蚀物,为陆相沉积环境。含矿地层库孜贡苏组杂砾岩中稀土元素整体亏损,显示存在强还原性盆地流体作用,矿床在还原性盆地流体作用下改造叠加富集。音频大地电磁测深反演恢复盆地基底形态特征,揭示富矿体与基底北西向隆起及其两侧的次级洼陷之间的构造坡折带具有密切空间关系,其构造岩相特征控制的同生构造带和层间裂隙带,有利于还原性盆地流体的运移聚集,它们可能是地球化学岩相学圈闭界面并导致沉淀金属元素,为深部找矿预测的构造岩相标志。
[Abstract]:The Sajek conglomerate type copper polymetallic deposit in Taxi area is located in the Tlass-Fergana NW-NW right-lateral strike-slip fault zone and the Sawayarton-Jigen left-lateral strike-slip thrust fault zone. The central part of the triangle formed by the Pamir thrust fold front belt is the Mesozoic Bayi sub-pull fault basin on the northern side of the Sulutierk fault uplift. A large number of Meso-Cenozoic sandstone-type copper-lead-zinc deposits in the Sulu Ferroclone belt indicate that the uplift plays an important role in controlling the gravel-type copper-lead-zinc deposits. The geochemical characteristics of trace elements and rare earth elements in the main strata and rocks in the Sajek copper deposit show that the source of the ore-forming material mainly comes from the denudation of the basement uplift and is a continental sedimentary environment. The depletion of rare earth elements in the complex conglomerate of Kuzigongsu formation in the ore-bearing strata shows that there is a strong reductive basin fluid and the deposit is reformed and enriched by the reductive basin fluid. Audio-frequency magnetotelluric sounding inversion is used to restore the basement features of the basin. It is revealed that there is a close spatial relationship between the ore-rich body and the tectonic slope break zone between the basement north-west uplift and the secondary depression on both sides of the basement. The syngenic tectonic zone and interlayer fissure zone controlled by tectonic facies characteristics are favorable to the migration and accumulation of fluid in the reductive basin, which may be the interface of geochemical lithofacies traps and lead to the precipitation of metal elements. It is a tectonic lithofacies indicator for deep prospecting.
【作者单位】：有色金属矿产地质调查中心;
【基金】：国土资源部公益性行业科研专项基金(201511016-1)
【分类号】：P618.41

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