伊宁地块特克斯达坂晚石炭世伊什基里克组双峰式火山岩地球化学特征

被引：4

作者：

宁文涛 ^{[1
]}

李永军 ^{[1
,2
]}

汪振宇 ^{[1
]}

王祚鹏 ^{[1
]}

李甘雨 ^{[1
]}

机构：

[1] 长安大学地球科学与资源学院

[2] 自然资源部岩浆作用成矿与找矿重点实验室

来源：

岩石矿物学杂志 | 2019年 / 38卷 / 01期

关键词：

双峰式火山岩; 地球化学特征; 伊什基里克组; 特克斯达坂; 伊宁地块;

D O I：

暂无

中图分类号：

P588.14 [喷出岩（火山岩）]; P597.3 [];

学科分类号：

070901 ; 070902 ;

摘要：

伊宁地块特克斯达坂一带出露的晚石炭世伊什基里克组双峰式火山岩主要由玄武岩、流纹岩两大端员组成,其Si O2含量为47. 13%～77. 72%,在53. 62%～72. 15%之间存在明显的间断,具有双峰式火山岩的特征。LAICP-MS锆石U-Pb定年获得流纹岩年龄为302. 8±3. 6 Ma,表明该套火山岩形成于晚石炭世。玄武岩Si O2含量为47. 13%～53. 62%,具有低Si O2、高Fe2O3(TFe2O3=10. 90%～17. 40%)、高MgO(3. 74%～10. 12%,平均为6. 48%)和高Na(Na2O=2. 84%～6. 69%)、低K(K2O=0. 48%～3. 77%)特征(Na2O/K2O=1. 21～12. 18),轻稀土元素富集而重稀土元素亏损[(La/Yb)N=1. 58～4. 94],具有弱的负Eu异常(δEu=0. 30～1. 10),亏损Ta、Nb、Th、Sr等不相容元素。流纹岩Si O2含量为72. 15%～77. 72%,具有高Si O2、高K(K2O=6. 12%～9. 48%)、低Na(Na2O=0. 40%～2. 39%)特征(Na2O/K2O=0. 04～0. 36),K、Rb和LREE显著富集[(La/Yb)N=2. 46～10. 48],相对亏损Ba、Sr、P、Ti,且有基本一致的强负Eu异常(δEu=0. 18～0. 44),具有A2型花岗岩地球化学特征。此外,玄武岩具有相对高的Mg#值和Co、Cr、Ni含量,其εNd(t)值为3. 45、3. 55,表明玄武岩来自于亏损地幔的部分熔融;而流纹岩具有低Mg#和正εHf(t)值,暗示其形成与玄武质岩浆底侵过程中的地壳熔融有关。结合二阶段锆石Hf模式年龄,认为源区可能与元古宙的变质结晶基底重熔有关。根据上述地球化学特征并结合构造判别图解,认为特克斯达坂一带伊什基里克组双峰式火山岩形成于造山后伸展环境,具有板内成因特征。该套典型双峰式火山岩的发现为进一步探讨伊宁地块石炭纪构造演化提供了重要依据。

引用

页码：1 / 20

页数：20

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