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兴蒙造山带南缘东段和龙地区I型花岗岩锆石U-Pb定年、地球化学特征及其地质意义
Zircon U-Pb dating,geochemistry and geological significance of the I-type granites in Helong area,the eastern section of the southern margin of Xing-Meng Orogenic Belt

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关庆彬 1   李世超 1 *   张超 2   时溢 3   李鹏川 1  
文摘 本文对兴蒙造山带南缘东段和龙地区八家子岩体和勇新岩体进行了岩相学、地球化学、LA-ICP-MS U-Pb定年和Sr-Nd同位素研究,以便制约该区的区域构造演化。锆石测年结果显示,八家子石英闪长岩结晶年龄为257.8 ±0.9Ma,形成于晚二叠世早期,勇新二长花岗岩的结晶年龄为243.2 ±1.1Ma和238.5 ±2.8Ma,形成于中三叠世。八家子石英闪长岩为钠质钙碱系列、偏铝质的Ⅰ型花岗岩类,富集轻稀土(LREEs)和大离子亲石元素(LILEs,Cs、Ba、K和Sr),亏损重稀土(HREEs)和高场强元素(HFSEs, Nb、Ta和P),结合Sr-Nd同位素特征显示其为壳源成因,形成于俯冲环境下,是玄武质下地壳部分熔融的产物。勇新二长花岗岩富硅、铝和钾,为高钾钙碱性系列、偏铝质-弱过铝质的I型花岗岩,富集轻稀土(LREEs)及大离子亲石元素(LILEs, Cs、K、Sr),亏损重稀土(HREEs)和高场强元素(HFSEs, Nb、Ta、P和Ti),结合Sr-Nd同位素特征显示其为壳源成因,形成于同碰撞环境下,是玄武质下地壳部分熔融的产物。花岗岩的侵位反映了研究区晚二叠世早期古亚洲洋板块俯冲于华北克拉通之下,中三叠世华北克拉通与兴凯地块碰撞拼合,说明古亚洲洋应闭合于晚二叠世末期-早三叠世期间。
其他语种文摘 Petrography, geochemical data, LA-ICP-MS zircon U-Pb dating and Sr-Nd isotopic have been obtained from Bajiazi pluton and Yongxin pluton in Helong area,with the aim of constraining the tectonic nature of the eastern section of the southern margin of Xing-Meng Orogenic Belt. LA-ICP-MS zircon U-Pb age data indicate that the quartz diorites from Bajiazi pluton formed during the early period of Late Permian and monzogranites from Yongxin pluton formed during Middle Triassic. Furthermore, Bajiazi quartz diorites belong to calc-alkaline,metaluminous I-type granitoids with feature of Na_2O content is higher than K_2O. They also show strong enrichment in LREEs and LILEs (Cs,Ba,K and Sr),depletions in HREEs and HFSEs (Nb,Ta and P). Combined the Sr-Nd isotopic data indicate the primary magma for Bajiazi pluton could be mainly derived from partical melting of the mafic lower crust under the tectonic setting of subduction. The Yongxin monzogranites belong to high-K calc-alkaline, metaluminous-weakly peraluminous I- type granitoids with features of rich in SiO_2,Al_2O_3 and K_2O. They also show strong enrichment in LREEs and LILEs (Cs, K and Sr), depletions in HREEs and HFSEs (Nb, Ta,Ti and P). Combined the Sr-Nd isotopic data indicate the primary magma for Bajiazi pluton could be mainly derived from partical melting of the mafic lower crust under the tectonic setting of syn-collision. The emplacement timing of Bajiazi pluton and Yongxin pluton reflect the Paleo-Asian oceanic plate had been subducting beneath the eastern section of the northern margin of the North China Plate during the early period of Late Permian,and the collision between North China Plate and Khanka Massif took place at the Middle Triassic,which suggests that the Paleo-Asian Ocean closed is between the end of Late Permian and Early Triassic.
来源 岩石学报 ,2016,32(9):2690-2706 【核心库】
关键词 兴蒙造山带南缘 ; I型花岗岩 ; 锆石U-Pb测年 ; 地球化学 ; 古亚洲洋
地址

1. 吉林大学地球科学学院, 长春, 130061  

2. 山东理工大学资源与环境工程学院, 淄博, 255049  

3. 沈阳地质矿产研究所, 沈阳, 110034

语种 中文
文献类型 研究性论文
ISSN 1000-0569
学科 地质学
基金 国家自然科学基金 ;  国土资源部中国地质调查局项目
文献收藏号 CSCD:5789773

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引证文献 14 篇

1 吴琼 吉林和龙长仁铜镍矿区含矿橄榄辉石岩年代学及其地质意义 矿床地质,2019,38(3):620-630
CSCD被引 3 次

2 张晓飞 内蒙古西乌旗地区晚二叠世-早中三叠世花岗岩年代学和地球化学特征及构造意义 地质学报,2019,93(8):1903-1927
CSCD被引 10 次

显示所有14篇文献

论文科学数据集

1. 北秦岭造山带晚三叠世宝鸡岩体锆石U-Pb年龄、地球化学和Sr-Nd-Pb同位素组成数据

2. 北秦岭地体晚侏罗世-早白垩世蟒岭和牧护关花岗岩体锆石年龄和地球化学组成数据

3. 福建闽西南大坪花岗斑岩的地球化学数据

数据来源：
国家青藏高原科学数据中心
PlumX Metrics
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