| 松辽盆地南缘基性岩脉中捕获锆石U-Pb年龄及其对基底岩浆事件的制约 |
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| 引用本文： | 贾维馨,姜琦刚,王冬艳,高文.松辽盆地南缘基性岩脉中捕获锆石U-Pb年龄及其对基底岩浆事件的制约[J].岩石学报,2016,32(9):2881-2888. |
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| 作者姓名： | 贾维馨 姜琦刚 王冬艳 高文 |
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| 作者单位： | 吉林大学地球科学学院, 长春 130061,吉林大学地球科学学院, 长春 130061;吉林大学地球探测科学与技术学院, 长春 130026,吉林大学地球科学学院, 长春 130061,桂林理工大学地球科学学院, 桂林 541004 |
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| 基金项目： | 本文受国家自然科学基金项目（40973019）和中国地质调查局项目（科[2012]D2-02、1212010911084）联合资助. |
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| 摘 要： | 团山子基性脉岩为松辽盆地南缘晚中生代最后一期岩浆活动,在其中获得了较多的捕获锆石。为了反映松辽盆地基底岩浆活动事件,对基性脉岩中捕获锆石进行了锆石LA-ICP-MS U-Pb定年。捕获锆石阴极发光(CL)图像和Th/U比值显示具有岩浆成因的特点。从锆石定年结果得到8组年龄,反映出早侏罗世晚期(176Ma)、海西期(291Ma)、加里东期(467Ma)、新元古代(942Ma)、中元古代(1368Ma)、古元古代(1886Ma和2165Ma)、新太古代(2458Ma)岩浆事件记录。松辽盆地南部基底组成以古生代和早中生代岩浆岩为主,并可能存在西保安群前寒武纪结晶基底(942Ma),并经历了复杂的岩浆演化。中元古代、古元古代、新太古代年龄的锆石具有磨圆和反应边,可能为与华北克拉通岩浆事件形成的锆石被搬运到松辽盆地南部,并被再次捕获的结果,反映松辽盆地南部与华北大陆具有一定的联系,但不确定存在该期的结晶基底。
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| 关 键 词： | 松辽盆地 基性脉岩 捕获锆石 LA-ICP-MS U-Pb定年 岩浆事件 |
| 收稿时间： | 4/2/2016 12:00:00 AM |
| 修稿时间： | 7/5/2016 12:00:00 AM |
Captured zircon U-Pb ages in the mafic dike and constraints of the magmatic events in the basement of southern Songliao Basin |
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| JIA WeiXin,JIANG QiGang,WANG DongYan and GAO Wen.Captured zircon U-Pb ages in the mafic dike and constraints of the magmatic events in the basement of southern Songliao Basin[J].Acta Petrologica Sinica,2016,32(9):2881-2888. |
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| Authors: | JIA WeiXin JIANG QiGang WANG DongYan and GAO Wen |
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| Institution: | College of Earth Sciences, Jilin University, Changchun 130061, China,College of Earth Sciences, Jilin University, Changchun 130061, China;College of Geo-Exploration and Science and Technology, Jilin University, Changchun 130026, China,College of Earth Sciences, Jilin University, Changchun 130061, China and College of Earth Sciences, Guilin University, Guilin 541004, China |
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| Abstract: | Tuanshanzi mafic dikes were the last phase magmatic activities among the Mesozoic period in the southern margin of Songliao Basin, some of captured zircons were acquired from the mafic dikes. In order to reflect the magmatic activity events in the basement of Songliao Basin, LA-ICP-MS U-Pb dating of the captured zircons in the mafic dikes has been analyzed. The cathode luminescence (CL) images and the Th/U ratios of the captured zircons express that the captured zircons have the features of magmatic origin. Eight groups of ages have been acquired from the results of the zircon dating, which reflected the record of magmatic events in Early Jurassic (176Ma), Hercynian period (291Ma), Caledonian (467Ma), Neoproterozoic (942Ma), Mesoproterozoic (1368Ma), Paleoproterozoic (1886Ma and 2165Ma) and Neoarchean (2458Ma). The basement had been experienced complex magmatic evolution and composition of the basement in southern Songliao Basin consisted mainly by Paleozoic and Early Mesozoic magmatic rocks as well as Xibao''an Group (942Ma), which is considered that Precambrian crystalline basement existed in southern Songliao Basin. Zircons with the ages of Mesoproterozoic, Paleoproterozoic and Neoarchean had been rounded and metamorphic accretion rims. Those period zircons are probably the products that the zircons first formed in magmatic active events in North China Craton, then transported to southern Songliao Basin and captured in mafic dikes again, which reflected that the southern margin of Songliao Basin had been related to North China Craton, but it is uncertainty for whether those periods magmatic events existed in crystalline basement of Songliao Basin. |
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| Keywords: | Songliao Basin Mafic dikes Captured zircon LA-ICP-MS U-Pb dating Magmatic events |
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