吉林大学学报(地球科学版) ›› 2017, Vol. 47 ›› Issue (4): 1119-1137.doi: 10.13278/j.cnki.jjuese.201704112

• 地质与资源 • 上一篇    下一篇

小兴安岭西北部早—中侏罗世TTG花岗岩年代学、地球化学特征及构造意义

赵院冬1,2, 车继英2, 吴大天2, 许逢明2, 赵君2, 李士超2   

  1. 1. 中国地质大学(北京)地球科学与资源学院, 北京 100083;
    2. 中国地质调查局沈阳地质调查中心, 沈阳 110034
  • 收稿日期:2016-10-21 出版日期:2017-07-26 发布日期:2017-07-26
  • 作者简介:赵院冬(1981—),男,博士研究生,高级工程师,主要从事岩浆过程与深部作用方面研究,E-mail:zhaoyd1981@qq.com
  • 基金资助:
    中国地质调查局地质调查项目(12120114055701);国家自然科学基金项目(41502063,41574093)

Early-Middle Jurassic TTG Granites in Northwest of Lesser Xing'an Range: Its Geochronology, Geochemical Characteristics and Tectonic Significance

Zhao Yuandong1,2, Che Jiying2, Wu Datian2, Xu Fengming2, Zhao Jun2, Li Shichao2   

  1. 1. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;
    2. Shenyang Institute of Geology and Mineral Resources, CGS, Shenyang 110034, China
  • Received:2016-10-21 Online:2017-07-26 Published:2017-07-26
  • Supported by:
    Supported by the Geological Survey Project of China Geological Survey(12120114055701) and the National Natural Science Foundation of China(41502063,41574093)

摘要: 通过对出露于小兴安岭西北部白石砬子地区中生代花岗岩的研究,查明该地区存在一套由英云闪长岩-花岗闪长岩-石英闪长岩和少量闪长岩为组合的花岗岩,锆石U-Pb LA-ICP-MS测年分别获得(171.1±1.3)、(173.9±3.9)、(178.3±1.5)和(169.1±6.2) Ma的岩体侵位年龄,证明其形成于早—中侏罗世。通过岩石地球化学方法判别该花岗岩组合具有高Al2O3型T1T2G1花岗岩特征,整体具有富硅、富铝,钠质,贫铁、镁、钛,属于偏铝质-弱过铝质钙碱性系列,富集轻稀土,相对亏损重稀土,富集Rb、Ba、Th、U、Sr等大离子亲石元素,相对亏损Nb、Ta、Zr、Hf等高场强元素,Eu具有轻微负异常的特点,与安第斯I型花岗岩具有相似性。其低Sr/Y值、(La/Yb)N值,弱或无负δEu异常等特征反映源区残留相矿物以角闪石、辉石为主,有少量斜长石,石榴石可能有少量残留。岩体露头有闪长质岩浆与英云(花岗)闪长质岩浆两种不完全机械混合的现象,反映可能存在两个以上的不同源区。另外,岩体不规则侵入元古宙地层(兴华渡口群和落马湖群)和岩浆中残留有大量早期捕获锆石,说明在岩浆上升侵位过程中与围岩发生同化混染作用。综合研究认为,该早—中侏罗世TTG岩浆形成与蒙古—鄂霍茨克洋的闭合作用密切相关,反映侏罗纪蒙古—鄂霍茨克洋存在向南侧微陆块的俯冲作用。

关键词: 小兴安岭西北部, 早&mdash, 中侏罗世, TTG花岗岩, 地球化学, 蒙古&mdash, 鄂霍茨克洋, 俯冲作用

Abstract: This paper reports the Mesozoic TTGs outcropped in the Northwestern Lesser Xing'an Range, which was caused by the subduction of the Mongol-Okhotsk Ocean. The TTGs are composed mainly of tonalite, granodiorite, quartz-diorite,and diorite. The zircon U-Pb LA-ICP-MS dating provided the age of (171.1±1.3) Ma, (173.9±3.9) Ma, (178.3±1.5) Ma and (169.1±6.2) Ma corresponding to the four samples, indicating that the magma formed during the Early-Middle Jurassic. They are the High-Al2O3 T1T2G1 based on the O'Connor's An-Ab-Or normative classification, and petrochemically belong to metaluminous or weakly peraluminous calc-alkaline series with enrichment in Si and Al, while poor in Fe, Mg, Ti, and Na. The LILE (e.g. Rb, Ba, Th, U, Sr) and LREE are enriched, while HFSE (e.g. Nb, Ta, Zr, Hf) and HREE are relatively depleted with slightly negative Eu anomalies. Such characteristics show that the TTGs have a similarity with type I granite in the Andes type orogenic belt. The low ratios of Sr/Y and (La/Yb)N and the weakly negative δEu indicate that the residual minerals in the source are hornblende, pyroxene and a little of plagioclase, and little garnet. The co-existence of diorite and tonalite in outcrops reflect that an incomplete and mechanical mixing of two or more magmas might occur, and the intrusion of the TTGs to the Proterozoic strata (such as Xinghuadukou Group and Luomahu Group) and the fact that the TTGs contains lots of captured zircons show that the TTGs magma experienced the assimilation and contamination of the wall rocks during their ascending up through the lithosphere. The authors conclude that the Jurassic TTGs were closely related to the closure of the Mongol-Okhotsk Ocean, and the subduction towards the southern massifs in that period.

Key words: Northwestern Lesser Xing'an Range, Early-Middle Jurassic, TTGs, geochemistry, Mongol-Okhotsk Ocean, subduction

中图分类号: 

  • P588.121
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