| 长江中下游成矿带庐枞盆地科学深钻中侵入岩年代学及地球化学研究 |
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| 引用本文： | 张舒,周涛发,吴明安,张赞赞,薛怀民,李小东.长江中下游成矿带庐枞盆地科学深钻中侵入岩年代学及地球化学研究[J].地质学报,2017,91(7):1483-1505. |
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| 作者姓名： | 张舒 周涛发 吴明安 张赞赞 薛怀民 李小东 |
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| 作者单位： | 合肥工业大学资源与环境工程学院,合肥工业大学资源与环境工程学院,安徽省地质调查院,安徽省地质调查院,中国地质科学院地质研究所,安徽省地质调查院 |
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| 基金项目： | 国家自然科学基金项目（面上项目，重点项目，重大项目） |
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| 摘 要： | 庐枞盆地科学钻LZSD-01是"深部探测与实验研究"专项在庐枞盆地施工的中国大陆科学钻预导孔,该钻孔终孔深度3008.29m,成功揭露了庐枞盆地的深部地质结构。本次工作对科学钻深部的隐伏正长-二长岩开展了系统的年代学、岩石学及地球化学研究。结果表明,钱铺隐伏正长-二长岩锆石U-Pb年龄分别为132.6±1.2 Ma、133.28±0.4 Ma,属于盆地砖桥火山旋回末期岩浆侵入活动的产物。岩浆岩具有硅近饱和、高铝、高碱富钾、低钛,富集Rb、K、Pb等大离子亲石元素,亏损Nb、Ta、Ti等高场强元素的特征,指示隐伏岩体为橄榄玄粗质岩石。结合Sr-Nd同位素特征,推测岩浆源区可能为EMI型富集地幔,元素的演化趋势显示斜长石、辉石、钛铁矿为主的矿物分离结晶作用可能是岩浆演化的主要机制。岩浆形成于板内伸展拉张的构造背景之下。
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| 关 键 词： | 庐枞火山岩盆地 科学钻 SinoProbe 钱铺地区 隐伏岩体 |
| 收稿时间： | 2015/12/18 0:00:00 |
| 修稿时间： | 2016/6/12 0:00:00 |
Geochronolgy and Petrological Geochemistry of Intrusions in the Lujiang-Zongyang Basin in the Mineralization Belt of the Middle and Lower Reaches of Yangtze River Revealed by Scientific Drilling |
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| ZHANG Shu,ZHOU Taof,WU Mingan,ZHANG Zanzan,XUE Huaimin and LI Xiaodong.Geochronolgy and Petrological Geochemistry of Intrusions in the Lujiang-Zongyang Basin in the Mineralization Belt of the Middle and Lower Reaches of Yangtze River Revealed by Scientific Drilling[J].Acta Geologica Sinica,2017,91(7):1483-1505. |
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| Authors: | ZHANG Shu ZHOU Taof WU Mingan ZHANG Zanzan XUE Huaimin and LI Xiaodong |
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| Institution: | School of Resources and Environmental Engineering, Hefei University of Technology,School of Resources and Environmental Engineering, Hefei University of Technology,Geological Survey of Anhui Province,Geological Survey of Anhui Province,Institute of Geology, Chinese Academy of Geological Sciences,Geological Survey of Anhui Province |
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| Abstract: | Scientific Drilling No.1 in Lujiang-Zongyang basin is the pilot hole of Chinese Continental Scientific Drilling. The deep geological structure exposed by LZSD-01 is benefit for researches on the basement structure and concealed magmatism. Systematic geochronology, petrology and geochemistry researches are carried on the concealed intrusions in LZSD-01. LA-ICPMS zircon U-Pb datings yield the ages of 132.6±1.2 Ma, 133.28±0.4 Ma for concealed syenite and monzonite, which are characterized by nearly saturated SiO2, high content of Al2O3 and K2O, low TiO2. The concealed intrusions of LZSD-01 also have relatively high LILEs such as Rb, K, Pb, but depleted HSFEs such as Nb, Ta and Ti. Based on the characteristics of the major and trace elements, mineral fractional crystallization is probably the main mechanism of the magma evolution. The Sr-Nd isotopic composition suggests that the primary magma of the concealed intrusions in Qianpu area is derived from enriched mantel type-I. The concealed intrusions were formed under within-plate extensional tectonic setting. |
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| Keywords: | Lujiang-Zongyang volcanic basin scientific drilling SinoProbe Qianpu area concealed intrusion |
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