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首页> 外文期刊>Lithos: An International Journal of Mineralogy, Petrology, and Geochemistry >Generation of Late Mesozoic Qianlishan A(2)-type granite in Nanling Range, South China: Implications for Shizhuyuan W-Sn mineralization and tectonic evolution
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Generation of Late Mesozoic Qianlishan A(2)-type granite in Nanling Range, South China: Implications for Shizhuyuan W-Sn mineralization and tectonic evolution

机译：华南南岭晚中生代前山山A（2）型花岗岩的产生：对石竹园钨锡矿化及构造演化的启示

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摘要

The Late Mesozoic Qianlishan granitic complex in the western Nanling Range, South China is associated with the Shizhuyuan giant W-Sn-Mo-Bi polymetallic deposit. It mainly consists of three phases of intrusions, P-1 porphyritic biotite granite, P-2 equigranular biotite granite and P-3 granite porphyry. All three phases of granite contain quartz, plagioclase, K-feldspar and Fe-rich biotite. They have geochemical affinities of A-type granites, e.g., high FeOT/(FeOT + MgO) ratios (0.84-0.99), total alkali (Na2O + K2O, 7.50-9.04 wt.%), high Ga/AI ratios (10,000*Ga/Al > 2.6) and high Zr + Nb + Y + Ce concentrations (>350 ppm). High Y/Nb ratios (>1.2) suggest that the Qianlishan complex belongs to A(2)-type granite. Zircon U-Pb ages indicate a short age interval decreasing from 158-157 Ma, to 158-155 Ma and to 154 Ma for the P-1, P-2 and P-3 granites, respectively. These ages are similar to the mineralization age of the Shizhuyuan tungsten polymetallic deposit, within error. The Qianlishan granites were generated at low oxygen fugacity conditions based on the low values of zircon Ce4+/Ce3+ ratios (1.53-198) and significantly negative Eu anomalies (Eu-N/Eu-N*, 0.03-0.13) in apatite. New zircon epsilon Hf(t) values for the P-3 granite range from -13.0 to -4.4, similar to those previously obtained for the P-1 and P-2 granites. Both the granite and apatite grains therein are characterized by high F but low Cl concentrations, suggesting the influx of a high F/CI component. The P-2 granites especially contain higher F contents (1840-8690 ppm) and W (7-158 ppm) and Sn (6-51 ppm) concentrations and with stronger evolution features. Positive trends between F and W and Sn of Qianlishan complex indicate that high F source is crucial for mineralization of W and Sn. We consider that the lithospheric mantle source may have been metasomatized by subduction fluids in the far end of subduction zones to produce the A(2) feature of the Qianlishan granite and the fluorine was introduced through breakdown of phengite in the oceanic slab. Partial melting of the lithospheric mantle was induced by upwelling of the asthenospheric mantle as a consequence of slab rollback. Tungsten and tin have been enriched in reduced granitic magmas through fractionation enhanced by high F contents, forming the giant polymetallic deposits. (C) 2016 Published by Elsevier B.V.
机译：中国南部南岭山脉中晚期的前里山山花岗岩复合体与石竹园巨型W-Sn-Mo-Bi多金属矿床有关。它主要由三个阶段的侵入体组成：P-1斑岩黑云母花岗岩，P-2等粒黑云母花岗岩和P-3花岗岩斑岩。花岗岩的所有三个相均包含石英，斜长石，钾长石和富铁黑云母。它们具有A型花岗岩的地球化学亲和力，例如高FeOT /（FeOT + MgO）比（0.84-0.99），总碱（Na2O + K2O，7.50-9.04 wt。％），高Ga / Al比（10,000 * Ga / Al> 2.6）和高Zr + Nb + Y + Ce浓度（> 350 ppm）。高的Y / Nb比（> 1.2）表明前里山复合体属于A（2）型花岗岩。锆石的U-Pb年龄表明P-1，P-2和P-3花岗岩的年龄年龄较短，分别从158-157 Ma，158-155 Ma和154 Ma减小。这些年龄与石竹园钨多金属矿床的矿化年龄相似，但有误差。千里山花岗岩是在低氧逸度条件下生成的，这是由于磷灰石中的锆石Ce4 + / Ce3 +比值较低（1.53-198），且Eu异常显着为负（Eu-N / Eu-N *，0.03-0.13）。 P-3花岗岩的新锆石epsilon Hf（t）值在-13.0至-4.4范围内，类似于先前对P-1和P-2花岗岩获得的值。其中的花岗岩和磷灰石晶粒均以高F但低Cl浓度为特征，表明大量F / CI成分涌入。 P-2花岗岩尤其含有较高的F含量（1840-8690 ppm）和W（7-158 ppm）和Sn（6-51 ppm）浓度，并且具有更强的演化特征。前里山综合体的F和W与Sn之间的正趋势表明，高F源对于W和Sn的矿化至关重要。我们认为，岩石圈地幔源可能已被俯冲带远端的俯冲流体交代，从而产生了前里山花岗岩的A（2）特征，并且氟是通过海藻板中的菱铁矿分解而引入的。平板回滚的结果是软流圈地幔的上涌引起岩石圈地幔的部分熔融。钨和锡通过高F含量增强的分馏富集了减少的花岗岩岩浆，形成了巨大的多金属矿床。 （C）2016由Elsevier B.V.发布

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