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首页> 外文期刊>Journal of Asian earth sciences >Paleoproterozoic SEDEX-type stratiform mineralization overprinted by Mesozoic vein-type mineralization in the Qingchengzi Pb-Zn deposit, Northeastern China
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Paleoproterozoic SEDEX-type stratiform mineralization overprinted by Mesozoic vein-type mineralization in the Qingchengzi Pb-Zn deposit, Northeastern China

机译：中国东北青城子铅锌矿床中元古代脉型矿化叠印的古元古代SEDEX型层状矿化

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摘要

The Qingchengzi Pb-Zn deposit is located in the northeastern Jiao-Liao-Ji Belt (JLJB), North China Craton (NCC). Field observation and age dating indicate that the deposit was formed from Paleoproterozoic sedimentary exhalative (SEDEX) stratiform mineralization overprinted by Late Triassic hydrothermal vein-type mineralization. Five types of fluid inclusions (FIs) are identified in the quartz grains, based on petrography and laser Raman spectroscopy: liquid-rich two-phase (type 1), vapor-rich two-phase (type 2), CO2-bearing (types 3a and 3b), and CO2-pure (type 4). Quartz from the SEDEX stratiform ores contains only type 1 FIs, and hydrogen-oxygen iso-topic compositions indicate that the ore-forming fluids were magmatic water-derived. The ore-forming fluids were likely of medium-temperatures and low-salinity, and belonged to a NaCl-H2O hydrothermal system. Quartz from the vein-types contains all five types of FIs, and the ore-forming fluids may have belonged to a medium-temperature, low-salinity NaCl-H2O-CO2 hydrothermal system. Hydrogen-oxygen isotopes indicate that the vein-type ore-forming fluids were derived from magmatic-meteoric mixed source. Rare-earth element (REE) and sulfur-lead isotopic compositions indicate that ore-forming materials of the SEDEX stratiform mineralization were derived from the wall-rocks and magma, wheres those of the vein-type mineralization were derived from Late Triassic granitic magma, wall-rocks, and the Paleoproterozoic SEDEX ores.Based on field geological and geochronological data, we propose the following regional metallogenic model: (1) SEDEX mineralization occurred during the Paleoproterozoic post-collisional extension in the JLJB; (2) vein-type mineralization was generated by the north-dipping subduction of the Yangtze Craton beneath the NCC, which led to continent-continent collision and slab break-off in the Late Triassic.
机译：青城子铅锌矿床位于华北克拉通（NCC）的东北角胶鸡带（JLJB）东北。实地观察和年龄测年表明该矿床是由晚三叠世热液脉型矿化叠印的古元古代沉积呼出气（SEDEX）层状矿化形成的。基于岩相学和激光拉曼光谱，在石英颗粒中鉴定出五种类型的流体夹杂物：富液两相（1型），富气两相（2型），含二氧化碳的（类型3a和3b），以及纯二氧化碳（类型4）。 SEDEX层状矿石中的石英仅包含1型FI，并且氢氧同位素组成表明成矿流体是岩浆水衍生的。成矿流体很可能属于中等温度和低盐度，属于NaCl-H2O热液系统。脉状类型的石英包含所有五种类型的FI，成矿流体可能属于中等温度，低盐度的NaCl-H2O-CO2水热系统。氢氧同位素表明，脉型成矿流体是从岩浆-岩浆混合源中提取的。稀土元素和硫铅同位素组成表明，SEDEX层状矿化的成矿物质来自围岩和岩浆，而脉型矿化的物质来自晚三叠世花岗岩岩浆，根据野外地质和年代学资料，我们提出以下区域成矿模式：（1）JLJB古元古代碰撞后伸展过程中发生了SEDEX成矿作用； （2）脉状型矿化是由NCC下方扬子克拉通的北倾俯冲产生的，从而导致了三叠纪晚期的大陆-大陆碰撞和板块断裂。

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