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华北地块北缘晚古生代—早中生代岩浆活动期次、特征及构造背景
Geochronology, geochemistry and tectonic setting of the Late Paleozoic-Early Mesozoic magmatism in the northern margin of the North China Block: A preliminary review
  
中文关键词:岩浆活动期次  晚古生代—早中生代  华北地块  大陆边缘  锆石U-Pb定年  兴蒙造山带(中亚造山带)
英文关键词:magmatism phases  Late Paleozoic-Early Mesozoic  North China Block  continental margin  zircon U-Pb dating  Xing-Meng Orogenic Belt (Central Asian Orogenic Belt)
基金项目:国土资源部百人计划;中国地质调查局地调项目1212010711817);地质力学研究所基本科研业务费项目(DZLXJK200704)
作者单位E-mail
张拴宏 中国地质科学院 地质力学研究所 北京 100081 tozhangshuanhong@163.com 
赵 越 中国地质科学院 地质力学研究所 北京 100081  
刘建民 中国地质科学院 地质力学研究所 北京 100081  
胡健民 中国地质科学院 地质力学研究所 北京 100081  
宋 彪 北京离子探针中心 中国地质科学院 地质研究所 北京 100037  
刘 健 中国地质科学院 地质力学研究所 北京 100081  
吴 海 国土资源部 实物地质资料中心河北 燕郊065201  
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中文摘要:
      通过对华北陆块北缘近年来获得的晚古生代—早中生代岩浆岩锆石U-Pb及部分39Ar-40Ar测年结果的分析,认为该区晚古生代—早中生代期间至少经历了泥盆纪、早石炭世晚期—中二叠世及二叠纪末—三叠纪等3期明显的岩浆作用过程。泥盆纪岩浆活动时限在400~360 Ma左右,岩性主要为碱性岩(正长岩及二长岩),其次为基性-超基性岩、二长闪长岩、碱性花岗岩及流纹岩,出露面积较少。早石炭世晚期—中二叠世岩浆活动时限在330~265 Ma左右,岩性主要为闪长岩、石英闪长岩、花岗闪长岩及花岗岩,其次为辉长岩及英云闪长岩。二叠纪末—三叠纪岩浆活动(250~200 Ma),岩性主要为钾长花岗岩、二长花岗岩及碱性杂岩,其次为基性-超基性岩及少量中酸性火山岩。华北地块北缘晚古生代—早中生代岩浆岩呈近东西走向的带状分布,其中泥盆纪及早石炭世晚期—中二叠世岩浆岩主要分布在内蒙古隆起上,而二叠纪末—三叠纪岩浆岩分布范围更大,其南界可以到达燕山构造带最南端的蓟县盘山及太行山北段的河北涿鹿矾山地区。这些广泛分布的多期次岩浆活动表明华北地块北缘在晚古生代—早中生代期间经历了复杂的岩浆及构造作用过程。泥盆纪岩浆活动可能与白乃庙岛弧岩带与华北克拉通弧-陆碰撞后的伸展作用有关。早石炭世晚期—中二叠世岩浆活动的形成与古亚洲洋向华北地块的俯冲作用有关。而二叠纪末—三叠纪岩浆活动的形成与华北地块与西伯利亚南缘蒙古增生褶皱带拼合后的伸展及岩石圈拆沉作用有关。
英文摘要:
      Tectonic evolution of northern North China Block (NCB) and its relation with the Central Asia Orogenic Belt (CAOB) during the Late Paleozoic to Early Mesozoic period have aroused considerable interest among earth scientists in recently years. A summary of the recently obtained zircon U-Pb or 39Ar-40Ar ages of the Late Paleozoic-Early Mesozoic magmatic rocks in the northern margin of NCB indicates that at least three stages of magmatism including Devonian (400~360 Ma), late Early Carboniferous to Middle Permian (330~265 Ma) and latest Permian to Triassic (250~200 Ma) occurred during the Late Paleozoic to Early Mesozoic period. The main components of the Devonian magmatism are syenite and monzonite, together with some other rocks such as monzodiorite, alkaline granite, rhyolite and mafic-ultramafic rocks. These rocks exhibit high alkali content (K2O+Na2O) and have alkaline to high K calc-alkaline, metaluminous or weak peraluminous geochemical features. Rocks from the late Early Carboniferous-Middle Permian intrusive suite are composed mainly of diorite, quartz diorite, granodiorite and granite, with some gabbro and tonalite. The late Early Carboniferous-Middle Permian magmatic rocks have variable SiO2 content and calc-alkaline to high K calc-alkaline, metaluminous or weak peraluminous geochemical features. Some of the late emplaced magmatic rocks (latest Early Permian-Middle Permian) display shoshonitic or alkaline geochemical compositions, indicating a trend of transition from calc-alkaline to shoshonitic or alkaline series during magmatic evolution. The latest Permian magmatic rocks consist mainly of monzogranite, K-feldspar granite, syenite, monzonite, mafic-ultramafic rocks and some intermediate-felsic volcanic rocks. They are characterized by high content of SiO2, K2O and alkali (K2O+Na2O) and display geochemical signatures ranging from highly fractionated I-type to A-type. Magmatic evolution exhibits a transition trend from high K calc-alkaline series in the early stage to the coexistence of alkaline and high K calc-alkaline series during the late stage. Compared with the Devonian and late Early Carboniferous to Middle Permian rocks, the latest Permian to Triassic magmatic rocks show much more extensive distribution. The wide distribution of the Late Paleozoic to Early Mesozoic magmatic rocks indicates a very complex tectonomagmatic history of the northern margin of the NCB during the Late Paleozoic to Early Mesozoic period. The Devonian rocks are probably related to post-collisional extension after the arc-continental collision between the Early Paleozoic Bainaimiao arc belt and the northern margin of the North China Craton during the latest Silurian to earliest Devonian period. The late Early Carboniferous to Middle Permian intrusive rocks are interpreted as subduction-related magmatic rocks emplaced in an Andean-style continental margin arc during the southward subduction of the Paleo-Asian oceanic plate beneath the NCB. The formation of large quantities of latest Permian to Triassic magmatic rocks might have resulted from post-collisional/post-orogenic lithospheric extension after final collision and suturing of the Mongolian arc terranes with the NCB.
张拴宏,赵 越,刘建民,胡健民,宋 彪,刘 健,吴 海,2010,华北地块北缘晚古生代—早中生代岩浆活动期次、特征及构造背景[J].岩石矿物学杂志,29(6):824~842.
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