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首页> 外文期刊>Minerals >Geochemical Characteristics of A-Type Granite near the Hongyan Cu-Polymetallic Deposit in the Eastern Hegenshan-Heihe Suture Zone, NE China: Implications for Petrogenesis, Mineralization and Tectonic Setting
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Geochemical Characteristics of A-Type Granite near the Hongyan Cu-Polymetallic Deposit in the Eastern Hegenshan-Heihe Suture Zone, NE China: Implications for Petrogenesis, Mineralization and Tectonic Setting

机译：中国东北鹤根山-黑河缝合带红岩铜多金属矿床附近A型花岗岩的地球化学特征：对成岩作用，成矿作用和构造环境的启示

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In the eastern Hegenshan-Heihe suture zone (HHSZ) of NE China, Cu-Au hydrothermal mineralization at the newly discovered Hongyan deposit is associated with the Shanshenfu alkali-feldspar granite (SAFG). Zircon U-Pb dating showed that the inner phase and outer phase of the SAFG were formed at 298.8 ± 1.0 Ma and 298.5 ± 1.0 Ma, respectively. Whole rock geochemistry suggests that the SAFG can be classified as an A-type granite. Halfnium isotopes and trace elements in zircon suggest that the SAFG has high Ti-in-zircon crystallization temperature (721–990 °C), high magmatic oxygen fugacity and largely positive ε Hf (t) (from +6.0 to +9.9). We proposed that the SAFG was derived from crustal assimilation and fractional crystallization of juvenile crust metasomatized by subducting oceanic crust. The high oxygen fugacity of the SAFG suggests the chalcophile elements (e.g., Cu, Au) remained in the magma as opposed to the magma source. An arc-related juvenile source favors enrichment of Cu and Au in the resulting magma. Combined, these magmatic characteristics suggest Cu ± Au exploration potential for magmatic-hydrothermal mineralization related to the SAFG, and similar bodies along the HHSZ. The results obtained combined with regional geological background suggest that the Permian A-type granites and related mineralization along the HHSZ were formed in a post-collisional slab break-off process.
机译：在中国东北部的鹤山-黑河缝合带（HHSZ）东部，新发现的红岩矿床的铜金热液成矿作用与山神甫碱长石花岗岩（SAFG）有关。锆石U-Pb测年表明SAFG的内相和外相分别形成于298.8±1.0 Ma和298.5±1.0 Ma。整个岩石地球化学表明，SAFG可以归类为A型花岗岩。锆石中的半铀同位素和微量元素表明，SAFG具有较高的锆石中Ti晶化温度（721–990°C），岩浆氧逸度高和εHf（t）较大（从+6.0到+9.9）。我们提出，SAFG来源于俯冲洋壳交代后的地壳同化和部分结晶。 SAFG的高氧气逸度表明，与岩浆源相反，嗜硫元素（例如Cu，Au）保留在岩浆中。与弧有关的幼稚源有利于所形成的岩浆中铜和金的富集。综合起来，这些岩浆特征表明，与SAFG和沿HHSZ的类似矿体有关的岩浆热液成矿的Cu±Au勘探潜力。结合区域地质背景获得的结果表明，二叠系A型花岗岩和沿HHSZ的相关矿化是在碰撞后板破裂过程中形成的。

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