胶东地区燕山期岩浆活动及其构造环境——来自单颗锆石SHRIMP年代学的记录
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山东省地质实验研究科学院

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国家自然科学基金项目(面上项目,重点项目,重大项目)


The Mesozoic Magmaticactivities Framework in Jiaodong Area:SHRIMP Chronology Recording of Single Particle Zircon
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Shandong Institute and Laboratory of Geological Sciences

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    摘要:

    山东胶东地区中生代构造-岩浆事件和金矿成矿作用密切相关,其主要构造-岩浆事件包括:① 220~200 Ma,扬子板块相对华北板块的南北向碰撞形成苏鲁高压-超高压变质带及同造山花岗岩与造山后高碱正长岩,属于典型的幔源型花岗岩系列;② 165~150 Ma,晚侏罗世时期形成与金矿有关的玲珑(昆嵛山)造山早期片麻状二长花岗岩组合,为过铝质花岗岩类,属胶东基底岩系的部分重熔产物。③ 135~110 Ma,由壳幔混合岩浆结晶分异形成郭家岭花岗岩和伟德山花岗闪长岩。燕山期是胶东地区岩浆活动的鼎盛时期,表现为四次强烈的构造-岩浆事件,代表了燕山造山事件四个构造幕,并以挤压与伸展相互转化为特征。研究表明胶东地区中生代花岗岩具有继承性和再生性特点,采自郭家岭花岗闪长岩中的SHRIMP锆石U-Pb同位素年代学测定结果表明:锆石由核部到边部年龄值分别为2573~2194Ma、164.8~147.8和126.6~126.2Ma,显示了胶东结晶基底、玲珑花岗岩和郭家岭花岗岩形成的年代学信息,揭示了它们之间复杂的继承性和再生性,即新太古代胶东岩群、TTG岩系和古元古代荆山群、粉子山群等胶东基底岩系交代重熔形成S型玲珑花岗岩,由壳幔混合岩浆形成的郭家岭花岗岩在形成与侵位过程中重熔交代了部分玲珑花岗岩物质并侵位于玲珑花岗岩中。分析认为2573.4~2194.4 Ma是胶东结晶基底的年龄信息,164.8~147.8Ma代表了玲珑花岗岩形成的年龄信息,126.2~126.6Ma则代表了郭家岭花岗岩形成的年龄信息。这种年龄信息组合也反映了胶东地区从新太古代陆块形成、古元古代克拉通化到三叠纪华北陆块与扬子陆块碰撞至玲珑S型花岗岩形成、郭家岭壳幔混合型花岗岩形成演化的年代学记录,浓缩了胶东地区中生代岩浆起源和演化的过程,进而为诠释胶东地区深部岩浆作用过程提供了新的资料,并对后续的相关科学研究尤其是金矿的多期成矿作用提供了佐证。

    Abstract:

    The Mesozoic tectonic magmatic events are closely related to the mineralization of gold deposits in Jiaodong area(JA for short), Shandong Province. And the major tectonic magmatic events are including: ①the Sulu highultrahigh pressure metamorphic belt, the same orogenic granite and the post orogenic high alkali belongs to the typical mantle source type granite series, which formed in tectonic setting of the North South trending collision between the Yangtze plate and the North China plate during the age of 220~200 Ma; ②The gneissic granite combination of early Linglong (Kunyushan) orogenic related to gold deposit were formed in late Jurassic period about 165~150Ma, which were peraluminous granitoid and the partial remelting products of Jiaodong basement rocks; ③The crustmantle mixed magmatic were crystallised and differentiation and formed the Guojialing granite mountain Victorchandler granodiorite at 135~110Ma. The Yanshan period is the peak period of magmatic activity in Jiaodong area. It is shown as the four strong tectonic magmatic event, which represents the four tectonic episode of the Yanshan orogenic event, and is characterized by the transformation from compression to extension. The research shows that the Mesozoic granites in Jiaodong area are characterized by inheritance and regeneration. Our SHRIMP UPb dating of the zircon collected from Guojialing superunit granites show that: Zircons age values from core to edges were 2573~2194Ma, 164.8~147.8 Ma and 126.6~126.2Ma, which shows the crystalline basement of Jiaodong, the formation dating information of Linglong granite and guojialing granite. Also, they reveal the complex inheritance and regeneration, that to say, the Jiaodong basement rock such as Neoarchaean Jiaodong rock group, TTG rocks and Paleoproterozoic Jingshan Fenzishan group, are metasomating and remelting and formed the S type Linglong granite; the Guojialing granite composed of crust mantle mixed magma during in the process of formation and emplacement are remelting explain the part material Linglong granite and intruded in the Linglong granite. The author believes that the 2573.4~2194.4 Ma is Jiaodong crystalline basement age information, 164.8~147.8Ma on behalf of the Linglong granite formation age, and 126.2~126.6Ma represents the Guojialing granite formation age information. This age combination information also reflects the geochronology records from the formation of Archean continental block, Paleoproterozoic cratonization to collision of North China block and the Yangtze block during Triassic to the exquisite S type granite formation, Guojialing crust mantle mixed type granites in Jiaodong area. Also, it concentrates the evolution process of the origin and evolution during the Mesozoic Magmatic in the Jiaodong area, and provides new data for the deep magmatic processes. Besides, this would improve our understanding of processes of Au deposits with several metallogenic stages.

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李洪奎,李大鹏,耿科,郭宝奎,禚传源,梁太涛.2017.胶东地区燕山期岩浆活动及其构造环境——来自单颗锆石SHRIMP年代学的记录[J].地质学报,91(1):163-179.
LI Hongkui, LI Dapeng, GENG Ke,, GUO Baokui, ZHUO Chuanyuan, LIANG Taitao.2017. The Mesozoic Magmaticactivities Framework in Jiaodong Area:SHRIMP Chronology Recording of Single Particle Zircon[J]. Acta Geologica Sinica,91(1):163-179.

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  • 收稿日期:2016-06-01
  • 最后修改日期:2016-12-12
  • 录用日期:2017-01-12
  • 在线发布日期: 2017-01-16
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