| 华北陆块南缘汝阳群次火山岩SHRIMP锆石U-Pb年龄及其地质意义 |
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| 引用本文： | 刘文斌1, 申开洪2, 廖诗进1, 程兴国2, 陈俊魁1, 李万忠2, 霍清华1. 华北陆块南缘汝阳群次火山岩SHRIMP锆石U-Pb年龄及其地质意义[J]. 地质通报, 2015, 34(08): 1517-1525. |
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| 作者姓名： | 刘文斌1 申开洪2 廖诗进1 程兴国2 陈俊魁1 李万忠2 霍清华1 |
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| 作者单位： | 1.河南省地质调查院,河南 郑州 450001;2.河南省地质科学研究所,河南 郑州 450001 |
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| 摘 要： | 华北陆块南缘汝阳群下部的次火山岩一直被看作是与汝阳群同时代的火山喷发夹层。通过研究测得玄武岩SHRIMP锆石U-Pb年龄为213.5±2.4Ma，并在邻近该次火山岩层上部的紫红色泥岩中发现了褪色的角岩化现象，说明该火山岩是晚三叠世沿汝阳群下部顺层侵入的次火山岩岩床。通过对该次火山岩岩石及其地球化学特征的研究，认为该次火山岩起源于有早期俯冲洋壳或陆壳参与再循环的大陆富集型地幔的部分熔融，它与秦岭造山带几乎同时代形成的超高压榴辉岩、埃达克质岩石、高钾钙碱性花岗岩、环斑花岗岩等共同揭示了秦岭造山带自中三叠世全面碰撞造山之后，由碰撞挤压逐渐转变为伸展拉张的深部动力学过程。
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| 关 键 词： | 华北陆块南缘 汝阳群 秦岭造山带 晚三叠世 SHRIMP锆石U-Pb年龄 |
SHRIMP zircon U-Pb age of Ruyang Group subvolcanic rocks on the southern margin of the North China Craton and its geological significance |
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| LIU Wenbin1, SHEN Kaihong2, LIAO Shijin1, CHENG Xingguo2, CHEN Junkui1, LI Wanzhong2, HUO Qinghua1. SHRIMP zircon U-Pb age of Ruyang Group subvolcanic rocks on the southern margin of the North China Craton and its geological significance[J]. Geological Bulletin of China, 2015, 34(08): 1517-1525. |
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| Authors: | LIU Wenbin1 SHEN Kaihong2 LIAO Shijin1 CHENG Xingguo2 CHEN Junkui1 LI Wanzhong2 HUO Qinghua1 |
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| Affiliation: | 1. Henan Institute of Geological Survey, Zhengzhou 450001, He'nan,China;2. Henan institute of geologicial sciences, Zhengzhou 450001, He'nan, China |
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| Abstract: | Subvolcanic rocks of the lower Ruyang Group were formerly regarded as the volcanic eruptive interlayer in the same-aged Ruyang Group on the southern margin of North China Craton. The authors obtained the zircon SHRIMP U-Pb age of 213.5±2.4Ma from the zircon samples among the basalt and discovered the discolored hornfels inside the purple red mudstones near the upper subvolcanic rock layer, which suggests that the subvolcanic sill was concordantly intruded into the lower Ruyang Group during late Triassic. The subvolcanic rocks originated from the early subducted oceanic or continental crusts and was formed by partial melting of recirculated continental enriched mantle, as shown by petrological and geochemical characteristics of subvolcanic rocks. The subvolcanic rocks and the genesis of the same-aged ultrahigh-pressure eclogites, adakitic rock, high-K calc-alkaline granite and rapakivi granite in the Qinling orogenic belt all reveal the gradual deep dynamic process from the colliding extrusion to crustal extension after the whole colliding orogeny of the middle Triassic in Qinling orogenic belt. |
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| Keywords: | southern margin of North China Craton Ruyang Group Qinling orogenic belt Late Triassic SHRIMP zircon U-Pb age |
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