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天山中西段古生代花岗岩TIMS法锆石U-Pb同位素定年及岩石地球化学特征研究

徐学义, 马中平, 夏祖春, 夏林圻, 李向民, 王立社

徐学义, 马中平, 夏祖春, 夏林圻, 李向民, 王立社. 2006: 天山中西段古生代花岗岩TIMS法锆石U-Pb同位素定年及岩石地球化学特征研究. 西北地质, 39(1): 50-75.
引用本文: 徐学义, 马中平, 夏祖春, 夏林圻, 李向民, 王立社. 2006: 天山中西段古生代花岗岩TIMS法锆石U-Pb同位素定年及岩石地球化学特征研究. 西北地质, 39(1): 50-75.
XU Xue-yi, MA Zhong-ping, XIA Zu-chun, XIA Lin-qi, LI Xiang-min, WANG Li-she. 2006: TIMS U-Pb Isotopic Dating and Geochemical Characteristics of Paleozoic Granitic Rocks from the Middle-Western Section of Tianshan. Northwestern Geology, 39(1): 50-75.
Citation: XU Xue-yi, MA Zhong-ping, XIA Zu-chun, XIA Lin-qi, LI Xiang-min, WANG Li-she. 2006: TIMS U-Pb Isotopic Dating and Geochemical Characteristics of Paleozoic Granitic Rocks from the Middle-Western Section of Tianshan. Northwestern Geology, 39(1): 50-75.

天山中西段古生代花岗岩TIMS法锆石U-Pb同位素定年及岩石地球化学特征研究

TIMS U-Pb Isotopic Dating and Geochemical Characteristics of Paleozoic Granitic Rocks from the Middle-Western Section of Tianshan

  • 摘要: 通过对天山中西段古生代花岗岩的锆石TIMS法U-Pb同位素定年,表明中天山托克逊南—库米什北侵入于奥陶纪可可乃克群中的碱长花岗岩形成时代为395.1±0.9Ma,花岗闪长岩体形成于393.5±2.7Ma,石英闪长岩体形成于327.3±0.9Ma,斜长花岗岩体形成时代为424.1±1.1Ma,并揭示出中天山中段库米什地区的3期构造岩浆事件,分别相当于早志留世、中泥盆世和早石炭世.中天山哈希勒根大坂黑云母花岗岩形成于286.8±0.8Ma.对伊犁石炭—二叠纪裂谷带中花岗侵入岩类的锆石TIMS法U-Pb同位素定年,表明霍城果子沟角闪花岗岩形成于351.9±1.6Ma,昭苏煤矿花岗闪长岩体形成时代为348.4±0.8Ma,新源则克台角闪辉长岩体形成于308.2±1.2Ma.南天山巴音布鲁克地区侵入于巴音布鲁克群中的石英闪长岩体形成时代为446.8±1.2Ma,独—库公路南段库尔干道班14.6km和15.2km处的角闪斜长花岗岩体与黑云母花岗岩体分别形成于426.3±1.9Ma和425.1±1.8Ma.对花岗岩的岩石地球化学研究表明,中天山托克逊南—库米什北志留纪—早泥盆世花岗岩为钙碱系列,轻稀土富集,微量元素洋脊花岗岩标准化具有Rb、Th、Ba富集,Ta、Nb亏损的分配型式,形成于火山弧环境;石炭—二叠纪花岗岩为钙碱系列,准铝—过铝质花岗岩,轻稀土富集程度较前者低,微量元素洋脊花岗岩标准化具有Rb、Th富集,Ba略亏损和高场强元素亏损的特点,形成于后碰撞(post-collision)构造环境.伊犁石炭—二叠纪裂谷带中石炭—二叠纪花岗岩为过铝质花岗岩,轻稀土富集,微量元素洋脊花岗岩标准化分配型式同样具有Rb、Th富集,Ba明显亏损和高场强元素亏损的特点,亦形成于后碰撞(post-collision)构造环境.南天山库尔干花岗岩为Al2O3含量高的钙碱性系列、过铝质花岗岩,稀土元素含量中等(157.89×10-6~81.81×10-6),轻稀土富集,Eu负异常明显,微量元素洋脊花岗岩标准化呈现出K、Rb、Th、Ba富集和Nb、Ta、Zr、Hf高场强元素亏损的特点,其形成时代与天山古生代洋盆俯冲时限相当,为岛弧构造环境.依据Sr-Nd-Pb同位素回时计算结果,本次研究所取的花岗岩初始锶同位素比值高,介于0.70435~0.70982,εNd(t)值多小于零或为很低的正值,T2DM或TDM均远大于岩体形成年龄,δ18O‰多大于10,个别为6.7,显示出古老壳源物质在花岗岩浆的形成过程中起了重要作用.同时,鉴于花岗岩的εNd(t)均在0左右变动,同样说明,新生地壳在花岗岩浆的形成过程中同样起着重要作用.花岗岩的εNd(t)值与前寒武纪岩石的εNd(t)对比研究表明,中天山库米什北志留纪斜长花岗岩体可能是中新元古界斜长角闪岩部分熔融的产物,而石炭—二叠纪花岗岩既有中新元古界片麻岩或片岩部分熔融生成,亦有新生地壳部分熔融受到古老地壳混染后岩浆结晶产物.伊犁石炭—二叠纪花岗岩和南天山库尔干志留纪花岗岩均显示出新生地壳部分熔融,并受古老地壳混染的Nd同位素信息.
    Abstract: The results of TIMS U-Pbisotopic dating for the Paleozoic granitic rocks from the middle-western section of Tianshan show that,the ages of four granitic rock bodies,plagiogranite,alkali feldspar granite,granodiorite and quartz diorite,intruded into Ordovician Kekenaike Group distributing between Tuokeshun and Kumishi,Central Tianshan,are 424.1±1.1 Ma,395.1±0.9 Ma,393.2±1.4 Ma and 327.3±0.9 Ma,respectively,which reveal three stages of structure-magma events in middle section of Central Tianshan,occurred in Early Silurian,Middle Devonian and Early Carbon iferous,respectively;the biotite granite from Hax legendaban,Central Tiang shan,formed in 286.8±0.8 Ma;the granodio rite from Guozigou,Huocheng County,granodiorite from Zhao shu coalmine,and bojite from Zheketai,Xinyuan County,all of which distribute in the Carbon iferous to Permian riftbelt of Yili,formed in 351.9±1.6Ma,348.4±0.8 Ma and 308.3±1.2 Ma,resp ectivel.The hornblende-plagiog ranite and biotite granitefrom the southern section of Du-ku Road,Kuergan,formed in 426.3±1.9 Ma and 425.1±1.8 Ma,respectively.
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出版历程
  • 收稿日期:  2005-10-17
  • 修回日期:  2006-01-08
  • 发布日期:  2006-03-04

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