کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4730401 1640368 2015 20 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Zircon U–Pb ages and geochemistry of granitoids in the Truong Son terrane, Vietnam: Tectonic and metallogenic implications
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی
پیش نمایش صفحه اول مقاله
Zircon U–Pb ages and geochemistry of granitoids in the Truong Son terrane, Vietnam: Tectonic and metallogenic implications
چکیده انگلیسی


• We report geochronological and geochemical data of six granotoids.
• Four major magmatic activities occurred during Paleozoic and early Mesozoic.
• The Tamky–Phuoc Son ocean crust could be bidirectionally subducted during Paleozoic.
• Three metallogenic epochs are identified during Paleozoic and early Mesozoic.

Truong Son terrane, one of the most important tectonic and metallogenic terranes 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 shoshoniteseries 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.

Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Asian Earth Sciences - Volume 101, 1 April 2015, Pages 101–120
نویسندگان
, , , , , , , ,