| 内蒙古北山北缘蓬勃山一带古亚洲洋闭合时间制约——来自黑红山二长花岗岩的证据 |
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| 引用本文： | 朱炜,张正平,孙璎姝,程海峰,提振海,杜金利,苏朋涛,冯翼鹏,梁国庆.内蒙古北山北缘蓬勃山一带古亚洲洋闭合时间制约——来自黑红山二长花岗岩的证据[J].地质通报,2019,38(11):1846-1857. |
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| 作者姓名： | 朱炜 张正平 孙璎姝 程海峰 提振海 杜金利 苏朋涛 冯翼鹏 梁国庆 |
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| 作者单位： | 河北省区域地质调查院, 河北 廊坊 065000,河北省区域地质调查院, 河北 廊坊 065000,廊坊市第七中学, 河北 廊坊 065000,河北省区域地质调查院, 河北 廊坊 065000,河北省区域地质调查院, 河北 廊坊 065000,河北省区域地质调查院, 河北 廊坊 065000,河北省区域地质调查院, 河北 廊坊 065000,河北省区域地质调查院, 河北 廊坊 065000,河北省区域地质调查院, 河北 廊坊 065000 |
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| 基金项目： | 中国地质调查局项目《阴山成矿带小狐狸山和雅布赖地区地质矿产调查》（编号：DD20160039-09） |
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| 摘 要： | 黑红山二长花岗岩分布于红石山-百合山-蓬勃山蛇绿岩带北部,地球化学特征显示其属于准铝质-弱过铝质、中-高钾钙碱性系列,为高分异的I型花岗岩;轻稀土元素富集,轻、重稀土元素分馏明显,具弱负Eu异常,稀土元素曲线为右缓倾。微量元素相对富集Ba、K、Zr、Hf,亏损Ta、Nb、P、Ti,显示与俯冲有关的侵入岩特征,形成于碰撞前的火山弧环境。LA-ICP-MS锆石U-Pb定年获得~(206)Pb/~(238)U年龄加权平均值为315.2±2.5Ma。综合研究表明,黑红山地区在晚石炭世属于活动大陆边缘的火山弧,红石山-百合山-蓬勃山蛇绿岩带所代表的洋盆在此尚未消亡。
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| 关 键 词： | 地球化学特征 锆石U-Pb测年 晚石炭世 二长花岗岩 黑红山 |
| 收稿时间： | 2018/7/23 0:00:00 |
| 修稿时间： | 2018/8/20 0:00:00 |
Time constraint on the closing of the Paleo-Asian Ocean in northern Beishan of Inner Mongolia: Evidence from Heihongshan admellite |
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| ZHU Wei,ZHANG Zhengping,SUN Yingshu,CHENG Haifeng,TI Zhenhai,DU Jinli,SU Pengtao,FENG Yipeng and LIANG Guoqing.Time constraint on the closing of the Paleo-Asian Ocean in northern Beishan of Inner Mongolia: Evidence from Heihongshan admellite[J].Geologcal Bulletin OF China,2019,38(11):1846-1857. |
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| Authors: | ZHU Wei ZHANG Zhengping SUN Yingshu CHENG Haifeng TI Zhenhai DU Jinli SU Pengtao FENG Yipeng and LIANG Guoqing |
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| Institution: | Hebei Institute of Regional Geological Survey, Langfang 065000, Hebei, China,Hebei Institute of Regional Geological Survey, Langfang 065000, Hebei, China,Langfang No. 7 Middle School, Langfang 065000, Hebei, China,Hebei Institute of Regional Geological Survey, Langfang 065000, Hebei, China,Hebei Institute of Regional Geological Survey, Langfang 065000, Hebei, China,Hebei Institute of Regional Geological Survey, Langfang 065000, Hebei, China,Hebei Institute of Regional Geological Survey, Langfang 065000, Hebei, China,Hebei Institute of Regional Geological Survey, Langfang 065000, Hebei, China and Hebei Institute of Regional Geological Survey, Langfang 065000, Hebei, China |
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| Abstract: | The Late Carboniferous admellite in the Heihongshan area is located in the northern part of the Hongshishan-Baiheshan-Pengboshan ophiolite belt. The geochemical characteristics show that the admellite belongs to metaluminous to weakly peralic potassium aluminous calc alkaline series I type granite of high differentiation; its LREE enrichment and LREE and HREE fractionation are obvious, with weak Eu negative anomaly and right-inclined rare earth curve. Trace elements are relatively enriched in Ba, K, Zr and Hf but depleted in Nb, Ti, P and Sr, indicating the characteristics of intrusive rocks related to subduction and formed in the volcanic arc environment before collision. The U-Pb dating of LA-ICP-MS zircon yielded weighted average 206Pb/238U age of 315.2±2.5Ma. Comprehensive studies show that the Heihongshan area belonged to the volcanic arcs on the active continental margin in the Late Carboniferous epoch, and the Hongshishan-Baiheshan-Pengboshan ophiolite belt suggests that the oceanic basin in Heihongshan area was closed in the Late Carboniferous epoch. |
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| Keywords: | geochemical characteristics zircon U-Pb dating Late Carboniferous admellite Heihongshan |
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