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首页> 外文期刊>Journal of Asian earth sciences >Metasomatized asthenospheric mantle contributing to the generation of Cu- Mo deposits within an intracontinental setting: A case study of the ～128 Ma Wangjiazhuang Cu-Mo deposit, eastern North China Craton
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Metasomatized asthenospheric mantle contributing to the generation of Cu- Mo deposits within an intracontinental setting: A case study of the ～128 Ma Wangjiazhuang Cu-Mo deposit, eastern North China Craton

机译：交代的软流圈地幔促进了大陆内部Cu-Mo矿床的形成：以华北克拉通东部〜128 Ma Wangjiazhuang Cu-Mo矿床为例

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Cu-Mo deposits are commonly associated with talc-alkaline porphyries and derived from subduction-modified lithosphere in magmatic arcs. Here we report the Wangjiazhuang Cu-Mo deposit, which is peculiarly associated with an alkaline quartz monzonite that originated from a metasomatized asthenospheric mantle within an intracontinental setting in the eastern North China Craton (NCC). The deposit was formed at ca. 128.3 +/- 0.7 Ma (2 sigma), basically coincident with the emplacement of the host quartz monzonite (128.8 +/- 1.0 Ma, 2 sigma). Pegmatitic vein-type and stockwork-/disseminated-type mineralizations were identified in the deposit, of which the former is shallowly situated and characterized by coarse and well-crystallized Cu- and Mo-bearing sulfides + quartz + biotite + K-feldspar assemblages, whereas the latter is deeply situated and characterized by stockworks or Cu- and Mo-bearing sulfides disseminated in the altered quartz monzonite. Separation between Cu-rich and Morich ore bodies at shallow depth was also observed. The Cu-Mo mineralization is typically associated with potassic-silicic alteration. High-temperature fluid inclusions with halite/sylvite daughter minerals (having homogenization temperatures of 287-466 degrees C and salinities of 33.8-55.3 wt% NaCl equivalent) suggest a magmatic origin of the ore-forming fluids. Differentiation of the fluids into vapor-rich and liquid-rich phases occurred during the magmatic-hydrothermal processes, as indicated by the coexistence of vapor-rich, liquid-rich and daughter mineral-rich fluid inclusions with similar homogenization temperatures. LA-ICP-MS analysis of the fluid inclusions shows that Cu is highly partitioned into the vapor-rich fluid inclusions, whereas Mo is mainly concentrated in the daughter mineral-rich fluid inclusions. This implies that phase differentiation of the oreforming fluids was likely responsible for the separation of Cu-rich and Mo-rich ore bodies. The presence of hematite in the fluid inclusions also suggests high oxidation state of the ore-forming fluids. Based on the variations of delta S-34 in sulfides and Al contents in quartz, continuous reduction of the oxidized ore-forming fluids, coupled with pH change of the fluids during water-rock interaction, led to the deposition of the ore-forming metals.
机译：Cu-Mo矿床通常与滑石碱性斑岩有关，并来源于岩浆弧中的俯冲修饰岩石圈。在这里，我们报告了王家庄铜钼矿床，该矿床与碱性石英蒙脱石特别相关，该碱性石英蒙脱石源自华北克拉通东部（NCC）东部陆内环境中交代的软流圈地幔。沉积物形成于约。 128.3 +/- 0.7 Ma（2 sigma），与主体石英蒙脱石的位置基本一致（128.8 +/- 1.0 Ma，2 sigma）。在该矿床中发现了成岩脉型矿床和储层/散布型矿床，其中前者位于浅层，其特征是粗晶和粗晶的含铜和钼的硫化物+石英+黑云母+钾长石组合，后者位于深处，其特征是在改变后的石英蒙脱石中散布着长方体或含铜和钼的硫化物。还观察到了富铜矿体和莫里奇矿体在浅深度之间的分离。 Cu-Mo矿化通常与钾硅质蚀变有关。含有岩盐/钾盐子矿物的高温流体包裹体（均质温度为287-466摄氏度，盐度为33.8-55.3 wt％NaCl当量）表明成矿流体是岩浆成因的。在岩浆热液过程中，流体分为富蒸气相和富液体相，这由具有相似均质温度的富蒸气，富液体和子富矿流体夹杂物并存所表明。 LA-ICP-MS对流体包裹体的分析表明，Cu高度划分为富蒸气流体包裹体，而Mo主要集中在子矿物富流体包裹体中。这意味着成矿流体的相区分可能是富铜和富钼矿体分离的原因。流体包裹体中赤铁矿的存在也表明成矿流体的高氧化态。基于硫化物中δ-S-34和石英中Al含量的变化，氧化成矿流体的连续还原，以及水-岩相互作用过程中流体的pH值变化，导致成矿金属沉积。

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