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首页> 外文期刊>Journal of Asian earth sciences >Zircon U-Pb ages and geochemistry of granitoids in the Truong Son terrane, Vietnam: Tectonic and metallogenic implications
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Zircon U-Pb ages and geochemistry of granitoids in the Truong Son terrane, Vietnam: Tectonic and metallogenic implications

机译：越南Truong Son地带的锆石U-Pb年龄和花岗岩类的地球化学：构造和成矿意义

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摘要

Truong Son terrane, one of the most important tectonic and metallogenic terrenes in Indochina block, is composed of many volcano-plutonic complexes. Reported here is geochronological and geochemical data obtained from six different volcano-plutonic complexes. The new data reveals that the granite from the Hai Van complex is 438 Ma in age, and shows collision-related geochemical characteristics; whereas another five samples from five volcano-plutonic complexes present consistent emplacement and crystallization ages ranging from 261 to 242 Ma. Dien Bien granodiorite, Phia Bioc monzogranite and Dong Trau rhyolite display typical subduction-related calc-alkaline affinity (e.g., depletion in Nb-Ta and Ti and enrichment in Rb and La), while monzogranite from Song Ma complex displays collision-related shoshon-iteseries and granites from Bengiang-Queson complex are related to post-collision calc-alkaline series. Based on these observations, in combination with the previous published geochronological data, we propose that at least four major stages of magmatic activities occurred during the Paleozoic and the Early Mesozoic through the Truong Son terrane: Ordovician-Silurian (420-470 Ma), Late Carboniferous-Early Permian (280-300 Ma), Late Permian to Mid-Triassic (245-270 Ma) and Middle-Late Triassic (200-245 Ma). These magmatic activities are not only attributed to the Tethyan Song Ma ocean southwestward subduction but also related to Paleo Tamky-Phuoc Son oceanic bidirectional subduction. Synthesized with regional metallogenic data, we identified three metallogenic epochs: (1) Late Carboniferous-Early Permian (280-300 Ma) arc-magmatic hydrothermal Cu-Au-Fe polymetallic metallogenic system related to the Tamky-Phuoc Son ocean north-dipping subduction; (2) Late Permian-Middle Triassic (245-280 Ma) arc-magmatic hydrothermal Cu-Au-Fe and orogenic W-Sn-Au polymetallic metallogenic system, which linked to both Paleo-Tethyan Song Ma ocean south-dipping subduction and Tamky-Phuoc Son ocean closure; (3) Middle to Late Triassic (200-245 Ma) syn-collisional magmatic epithermal Fe-Au-W-Sn and post-collisional (or orogenic) Au system.
机译：Truong Son地层是印度支那地区最重要的构造和成矿地形之一，由许多火山-古生界复合体组成。这里报告的是从六个不同的火山-古生代复合体获得的地质年代和地球化学数据。新数据表明，来自海范综合体的花岗岩年龄为438 Ma，并显示出与碰撞有关的地球化学特征。而来自五个火山-古生代复合体的另外五个样品呈现一致的进位和结晶年龄，范围从261Ma到242Ma。 Dien Bien花岗闪长岩，Phia Bioc单晶花岗岩和Dong Trau流纹岩显示出与俯冲有关的钙-碱性亲和力（例如，Nb-Ta和Ti的耗竭以及Rb和La的富集），而松马复合物中的辉长花岗岩显示出与碰撞有关的Shoshon- Bengiang-Queson复合体中的iteseries和花岗岩与碰撞后的calc-碱性系列有关。根据这些观察结果，结合先前发布的地质年代学数据，我们认为至少在古生代和中生代之前的Truong Son地壳发生了岩浆活动的至少四个主要阶段：奥陶纪-西陆纪（420-470 Ma），晚期石炭纪-早二叠世（280-300 Ma），晚二叠世至中三叠纪（245-270 Ma）和中晚三叠纪（200-245 Ma）。这些岩浆活动不仅归因于特提斯松马海洋向西南俯冲，而且与古Tamky-Phuoc Son大洋双向俯冲有关。综合区域成矿数据，我们确定了三个成矿纪元：（1）与Tamky-Phuoc Son海洋北倾俯冲有关的晚石炭纪-早二叠世（280-300 Ma）弧-岩浆热液Cu-Au-Fe多金属成矿系统。 ; （2）晚二叠世-中三叠世（245-280 Ma）弧-岩浆热液Cu-Au-Fe和造山W-Sn-Au多金属成矿系统，与古特提斯扬松马海洋南倾俯冲和坦基-Phuoc Son大洋封路； （3）中三叠世（200-245 Ma）同碰撞岩浆超热Fe-Au-W-Sn和碰撞后（或造山带）Au系统。

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