Zircon U-Pb dating and Hf isotopic compositions of granite porphyry and rhyolite porphyry from Jingniu basin in the Middle-Lower Yangtze River Belt and its geological significance
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摘要:
金牛盆地位于鄂东南矿集区, 是长江中下游成矿带重要的火山岩盆地之一。相对宁芜和庐枞盆地, 金牛盆地找矿一直没有取得重大突破, 对其中次火山岩的年代学、成因和成矿属性的研究也很少。本次选择盆地中心吴佰浩地区深部钻孔中的花岗斑岩和流纹斑岩, 开展锆石U-Pb年龄和Hf同位素的研究工作, 获得了流纹斑岩锆石206Pb/238U的加权平均年龄为128±1Ma (n=14, MSWD=2.5), 锆石Hf同位素(176Hf/177Hf)i和εHf(t) 分别为0.28247~0.28262和-2.5~-7.7；花岗斑岩锆石206Pb/238U的加权平均年龄为129±1Ma (n=12, MSWD=1.3), 锆石Hf同位素(176Hf/177Hf)i和εHf(t) 分别为0.28239~0.28259和-3.6~-10.7。本文确定金牛盆地中流纹斑岩和花岗斑岩的形成时代为129~128Ma, 与金牛盆地火山岩的形成时代(130~125Ma) 相当, 暗示金牛盆地火山岩和次火山岩均形成于早白垩世, 流纹斑岩和花岗斑岩是壳幔混合的产物。金牛盆地火山岩的形成时代与宁芜、、庐枞盆地相当, 次火山岩的形成时代也与宁芜、庐枞盆地玢岩铁矿的成矿岩体相当。提出金牛盆地除应关注玢岩铁矿外, 更应该关注与次火山岩有关的热液金矿。
Abstract:The Jinniu basin located in Southeast Hubei ore cluster, is one of volcanic basins of the Middle-Lower Yangtze Reaches metallogenic belt. Compared with Nanjing-Wuhu basin and Lujing-Zongyang basin, new mineral deposits have not been discovered in the Jinniu basin in recent years. To date, no geochronological or geochemical studies have been undertaken to sub-volcanic rocks in the Jinniu basin. The zircon U-Pb dating of rhyolite porphyry yielded an age of 128±1Ma in central of the Wubaihao area from Jinniu basin, its (176Hf/177Hf)i and εHf(t) values are ranging from 0.28247 to 0.28262 and -2.5 to -7.7, respectively. The zircon U-Pb dating of granite porphyry yielded an age of 129±1Ma, its (176Hf/177Hf)i and εHf(t) values are ranging from 0.28239 to 0.28259 and -3.6 to -10.7. The ages of granite porphyry and rhyolite porphyry are 129~128Ma, suggesting that they were developed during Early Cretaceous. The granite porphyry and rhyolite porphyry from Jingniu basin are derived from mixture enriched mantle and crustal. Both volcanic rocks and sub-volcanic rocks in the Jinniu basin were coeval with those in the Luzong, and Ningwu basins in the Middle-Lower Yangtze River Belt. The hydrothermal gold deposits and porphyry iron deposits have been played attention in the Jinniu Basin in the future.
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图 1
长江中下游地区晚中生代侵入岩和火山岩的地质略图(据毛建仁等, 1990)
Figure 1.
Sketch map showing the distribution of Late Mesozoic intrusions, and fault-bound volcano-sedimentary basins along the Middle-Lower Yangtze River Belt (modified after Mao et al., 1990)
图 2
长江中下游地区鄂东南矿集区地质简图, 显示三种不同类型侵入岩和火山岩盆地(据舒全安等, 1992)
Figure 2.
Geological map of the Southeast Hubei, Middle-Lower Yangtze River Belt, showing the three discrete suites of intrusions and basin (modified after Shu et al., 1992)
图 3
长江中下游地区金牛盆地地质简图(据李雄伟等, 2009修改)
Figure 3.
Geological distribution of volcanic rocks in the Jinniu basin, Southeast Hubei Province, Middle-Lower Yangtze River Belt, showing location of sample in this study
图 4
长江中下游地区金牛盆地吴伯浩地区剖面图(a) 和钻孔ZK202柱状图(b)(据李雄伟等, 2009修改)
Figure 4.
Cross section (a) and column (b) of drill No. ZK202 from the Wubaihao area, Jinliu Basin, Middle-Lower Yangtze River Belt
图 5
长江中下游地区金牛盆地流纹斑岩(DSZ08) 和花岗斑岩(DSZ09) 的正交偏光镜下照片
Figure 5.
Photomicrograph of diagrams of rhyolite porphyry and granite porphyry in the Jinniu basin, Middle-Lower Yangtze River Belt
图 6
长江中下游地区金牛盆地流纹斑岩(a) 和花岗斑岩(b) 的代表性锆石阴极发光照片
Figure 6.
Representative CL images of zircon for rhyolite porphyry (a) and granite porphyry (b) in the Jinniu basin, Middle-Lower Yangtze River Belt
图 7
长江中下游地区金牛盆地流纹斑岩(a) 和花岗斑岩(b) 的LA-ICPMS锆石U-Pb谐和图解
Figure 7.
LA-ICPMS zircon U-Pb concordia diagrams of rhyolite porphyry (a) and granite porphyry (b) in the Jinniu basin, Middle-Lower Yangtze River Belt
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