The genetic linkage between the Yuanjiang marble-hosted ruby deposit and Cenozoic tectonic evolution of the Ailao Shan-Red River shear zone (Southwest China)
作者： Tianjian Yang , Xiaoming Sun , Guiyong Shi , Dongsheng Li , Haoyang Zhou
DOI: 10.1016/J.JSEAES.2019.03.010
关键词: Shear zone 、 Metamorphic rock 、 Geology 、 Sillimanite 、 Geochemistry 、 Phlogopite 、 Closure temperature 、 Scapolite 、 Zircon 、 Gneiss
摘要: Abstract The Yuanjiang marble-hosted ruby deposit in the middle Ailao Shan-Red River (ASRR) shear zone, is only economic China. This hosted Paleoproterozoic sillimanite gneisses and ores are found metamorphosed platform carbonates. Rubies unevenly distributed within calcite-rich marble layers mainly associated with phlogopite, scapolite, graphite, pyrite. contain zircon, rutile, apatite, calcite inclusions. genesis of its genetic link to ASRR zone remain poorly understood. In this contribution, formation age has been indirectly constrained by in-situ LA-ICP-MS U-Pb dating zircon inclusions rubies 40Ar/39Ar syngenetic phlogopite from ruby-phlogopite bearing marble, which yielded ages 36.2 ± 1.1 Ma (MSWD = 1.4, 2σ, n = 4) 22.2–22.5 Ma, respectively. 36.2 Ma metamorphic falls range local crustal thickening related subduction-collision coupled spatial distribution deposits were not restricted we propose that mineralization was triggered continental rather than large-scale left-lateral shearing. Due estimated closure temperature 40Ar-39Ar system lower ore-forming temperature, obtained 22.2–22.5 Ma represent minimum deposit. These reveal a slower cooling rate (including Yen Bai deposits) outside (the Luc deposit), can be attributed additional heat shearing movement. Therefore, plays an important role transporting subsurface.
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