Zircon SHRIMP U-Pb Chronology of Diagenetic Mineralization of the Longtoushan Porphyry Gold Orefield,Gui County,Guangxi
Zircon SHRIMP U-Pb Chronology of Diagenetic Mineralization of the Longtoushan Porphyry Gold Orefield,Gui County,Guangxi
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发表时间：
2008
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通讯作者：
Mei Yuping
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作者：
Mei Yuping
广西贵县龙头山斑岩金矿床位于大瑶山隆起的西南部，与矿区内燕山晚期的流纹斑岩和花岗斑岩关系密切。利用SHRIMP定年技术对流纹斑岩和花岗斑岩中的锆石进行了SHRIMP定年，获得了103.3 Ma±2.4 Ma(95%置信度，MSWD=2.1)和100.3±1.4 Ma(95%置信度，MSWD=0.4)的理想年龄。结果表明，龙头山金矿田的成岩成矿作用发生在中晚白垩世。作者认为，流纹岩斑岩和花岗斑岩是同一岩浆事件的产物，但矿田中只发生了一次成矿事件，而不是早期研究认为的两期成岩成矿作用。
Located in the southwestern part of the Dayaoshan uplift,the Longtoushan porphyry gold deposit,Gui county,Guangxi,is closely related to the Late Yanshanian rhyolitic porphyry and granite-porphyry within the orefield.The authors carried out with high decision SHRIMP dating technique U-Pb chronology of zircons from the rhyolitic porphyry and granite-porphyry and gained ideal ages of 103.3±2.4Ma(95% confidence,MSWD=2.1)and 100.3±1.4Ma(95% confidence,MSWD=0.40),respectively.The result shows that diagenetic mineralization of the Longtoushan gold orefield happened during the Middle to Late Cretaceous.Based on the zircon ages,the authors concluded that the rhyolitic porphyry and granite-porphyry resulted from the same magmatic event,but only one mineralization event occurred in the orefield rather than two stages of diagenetic mineralizations as the earlier researches believed.