东准噶尔石炭系火山岩的形成机制及其对准噶尔洋盆闭合时限的制约

龙晓平,孙敏,袁超,肖文交,陈汉林,赵永久,蔡克大,李继亮. 东准噶尔石炭系火山岩的形成机制及其对准噶尔洋盆闭合时限的制约[J]. 岩石学报, 2006, 22(1): 31-40.
引用本文: 龙晓平,孙敏,袁超,肖文交,陈汉林,赵永久,蔡克大,李继亮. 东准噶尔石炭系火山岩的形成机制及其对准噶尔洋盆闭合时限的制约[J]. 岩石学报, 2006, 22(1): 31-40.
LONG XiaoPing~1 SUN Min~2 YUAN Chao~1 XIAO WenJiao~3 CHEN HanLin~4 ZHAO YongJiu~1 CAI KeDa~1 LI JiLiang~3 1.Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China 2.Department of Earth Sciences,The University of Hong Kong,Pokfulam Road,Hong Kong,China 3.Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China 4.Department of Earth Sciences,Zhejiang University,Hangzhou 310027,China. Genesis of Carboniferous volcanic rocks in the eastern Junggar:constraints on the closure of the Junggar Ocean.[J]. Acta Petrologica Sinica, 2006, 22(1): 31-40.
Citation: LONG XiaoPing~1 SUN Min~2 YUAN Chao~1 XIAO WenJiao~3 CHEN HanLin~4 ZHAO YongJiu~1 CAI KeDa~1 LI JiLiang~3 1.Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China 2.Department of Earth Sciences,The University of Hong Kong,Pokfulam Road,Hong Kong,China 3.Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China 4.Department of Earth Sciences,Zhejiang University,Hangzhou 310027,China. Genesis of Carboniferous volcanic rocks in the eastern Junggar:constraints on the closure of the Junggar Ocean.[J]. Acta Petrologica Sinica, 2006, 22(1): 31-40.

东准噶尔石炭系火山岩的形成机制及其对准噶尔洋盆闭合时限的制约

  • 基金项目:

    国家973项目(2001CB409801),香港RGC项目(HKU7040/04P),自然科学基金(40572043)及中科院领域前沿项目(GIGCX-03-01)资助成果.致谢 在分析测试过程中,中科院北京地质与地球物理研究所及香港大学地质系相关实验室给予了大力帮助,在此一致表示感谢.

  • 扎河坝石炭系火山岩出露于东准噶尔扎河坝蛇绿岩带北侧的上石炭统巴塔玛依内山组地层内,主要为玄武岩及玄武安山岩,Mg~#介于64~73,中等的TiO_2(<0.85%)和Al_2O_3(13.75%~16.88%)含量,相对低的CaO(4.51%~7.28%)和FeO~T(5.82%~7.71%)含量,显示初始岩浆特征。样品富Na(Na_2O/K_2O>1),具有较高的全碱含量(K_2O+Na_2O)=4.4%~7.1%)。样品富集大离子亲石元素(LILE),相对亏损高场强元素(HFSE),具有较低的Nb含量(0.8×10~(-6)~2.6×10~(-6))和明显的Nb-Ta负异常,显示典型的消减带岩浆特征。样品显示微弱的轻稀土富集(La/Yb)_N=1.0~2.1,无明显的重稀土分馏(Gd/Yb)_N=1.1~1.3,无明显的铕异常(δEu=0.94~1.08)及铈异常(δCe=1.00~1.06)。此外,样品具有较高的(~(87)Sr/~(86)Sr)_i(0.705282~0.705420)和ε_(Nd)(t)值(+6.59~+7.58)。上述特征与样品低的Th及Pb含量(Th<0.55×10~(-6),Pb<3.52×10~(-6))和较高的Ce/Pb比值(4~79)可以排除陆壳混染,说明其形成于消减带环境。样品较高的Ce/Th(18~32),Ce/Pb,Ba/Rb(21~76)和Ba/Th(>179)比值,ε_(Nd)(t)值接近亏损地幔,并缺乏明显的负铈异常,说明源区没有明显的消减沉积物加入。样品的微量元素特征及Sr-Nd同位素组成说明其形成于热液交代的洋壳俯冲脱水使上覆地幔楔部分熔融。而样品相对贫Pb的特征,可能与源于高温角闪岩相俯冲板片特殊的贫Pb流体有关。这套火山岩说明东准噶尔晚石炭世仍存在洋内的消减俯冲环境,准噶尔大洋的闭合应当发生在晚石炭世之后。
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出版历程
收稿日期:  2005-11-30
修回日期:  2005-12-19
刊出日期:  2006-01-31

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