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西准噶尔巴音达拉地区卡拉岗组火山岩锆石U-Pb年代学、地球化学及其地质意义

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刘阁, 舍建忠, 杨文龙, 王庆军, 贾健, 邸晓辰. 2018. 西准噶尔巴音达拉地区卡拉岗组火山岩锆石U-Pb年代学、地球化学及其地质意义[J]. 中国地质, 45(6): 1241-1250. doi: 10.12029/gc20180613
引用本文: 刘阁, 舍建忠, 杨文龙, 王庆军, 贾健, 邸晓辰. 2018. 西准噶尔巴音达拉地区卡拉岗组火山岩锆石U-Pb年代学、地球化学及其地质意义[J]. 中国地质, 45(6): 1241-1250. doi: 10.12029/gc20180613
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LIU Ge, SHE Jianzhong, YANG Wenlong, WANG Qinjun, JIA Jian, DI Xiaochen. 2018. Zircon U-Pb chronology and geochemistry of the Kalagang Formation volcanic rocks in Bayindala area, West Junggar, and their geological significance[J]. Geology in China, 45(6): 1241-1250. doi: 10.12029/gc20180613
Citation: LIU Ge, SHE Jianzhong, YANG Wenlong, WANG Qinjun, JIA Jian, DI Xiaochen. 2018. Zircon U-Pb chronology and geochemistry of the Kalagang Formation volcanic rocks in Bayindala area, West Junggar, and their geological significance[J]. Geology in China, 45(6): 1241-1250. doi: 10.12029/gc20180613
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西准噶尔巴音达拉地区卡拉岗组火山岩锆石U-Pb年代学、地球化学及其地质意义

  • 1.

    新疆地质调查院, 新疆 乌鲁木齐 830000

  • 2.

    核工业二一六大队, 新疆 乌鲁木齐 830011

  • 基金项目:
    中国地质调查局"新疆区域地质调查片区总结与服务产品开发"项目（DD20160345-04）资助
详细信息
    作者简介: 刘阁, 男, 1988年生, 硕士, 工程师, 主要从事区域地质调查研究工作; E-mail:119317049@qq.com

  • 中图分类号: P597+.3;P588.14

Zircon U-Pb chronology and geochemistry of the Kalagang Formation volcanic rocks in Bayindala area, West Junggar, and their geological significance

  • 1.

    Geological Research Academy of Xinjiang, Urumqi 830000, Xinjiang, China

  • 2.

    No. 216 Geological Party of CNNC, Urumqi 830011, Xinjiang, China

  • Fund Project: Supported by Regional Geological Survey Project of China Geological Survey (No. 12120113040800)
More Information
    Author Bio: LIU GE, male, born in 1988, master, engineer, majors in regional geological survey; E-mail: 119317049@qq.com .

    摘要

  • 西准噶尔巴音达拉地区发育一套酸性火山岩，被称为卡拉岗组，岩石组合以流纹岩、英安岩、流纹质熔结凝灰岩等酸性火山岩为主。本文对卡拉岗组火山岩进行高精度锆石LA-ICP-MS U-Pb测年，获得英安岩和流纹岩的加权平均206Pb/238U年龄分别为（294.4±1.3）Ma（n=9，MSWD=0.8）和（298.4±2.5）Ma（n=9，MSWD=3.4），其形成于早二叠世。岩石地球化学特征表明，卡拉岗组火山岩岩具有高硅（66.69%~75.21%），富碱（Na2O+K2O：6.98%~8.35%），低MgO（0.18%~1.32%），贫钙（0.24%~2.49%）的特征，均属过铝质（A/CNK：1.14~1.33）及高钾钙碱性系列。微量元素数据显示，稀土总量为∑REE为83.82×10-6~197.61×10-6，（La/Yb）N=3.15~12.50，轻、重稀土元素分馏比较明显，轻稀土元素（LREE）较为富集，重稀土元素分布相对平坦，球粒陨石标准化配分模式为右倾型。微量元素富集大离子亲石元素（LILE）Rb、Th、U、K，并亏损高场强元素（HFSE）Nb、Ta、P、Ti。综合最新区域资料及本文研究成果，文章认为研究区早二叠世卡拉岗组火山岩岩浆来源于壳源物质不同程度的部分熔融，残留相中有少量斜长石和角闪石，为后碰撞伸展阶段的产物。

    Silicic volcanic rocks are developed in Bayindala area of West Junggar. The Kalagang Formation volcanic rocks are mainly composed of rhyolite, dacite, rhyolitic tuff and ignimbrite. This paper reports the results of high-precision zircon LA-ICPMS U-Pb dating of the Kalagang Formation volcanic rocks, which yielded weighted mean 206Pb/238U ages of(294.4±1.3) Ma (n=9, MSWD=0.8, dacite) and(298.4±2.5) Ma (n=9, MSWD=3.4, rhyolite), corresponding to the Early Permian. Petrogeochemical analyses suggest that the Kalagang Formation volcanic rocks are characterized by high silica (SiO2:66.69%-75.21%) and alkali (Na2O + K2O:6.98%-8.35%), and low magnesium and calcium (MgO 0.18%-1.32%, CaO 0.24%-2.49%). They belong to peraluminous (A/CNK:1.14-1.33) and high-K calc-alkaline series. The rocks are poor in rare earth elements with ∑REE being 83.82×10-6-197.61×10-6, enriched in LREE[(La/Yb)N=3.15-12.50] and LILEs (Rb, Th, U, K) and depleted in HFSE, especially Nb, Ta, P and Ti. In combination with previous studies, the authors hold that the Kalagang Formation volcanic rocks in a postcollisional extensional setting were formed by varying degrees of crust partial melting and the residua had a little plagioclase and hornblende.

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  • 图 1  区域构造及地理位置简图(a, 据Chen Jiafu et al., 2010修改)和巴音达拉地区地质简图（b）

    Figure 1. 

    下载: 全尺寸图片 幻灯片

    图 2  西准噶尔卡拉岗组火山岩英安岩锆石阴极发光图像（a）流纹岩锆石阴极发光图像（b）

    Figure 2. 

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    图 3  西准噶尔卡拉岗组火山岩英安岩锆石U-Pb年龄谐和图（a）、流纹岩锆石U-Pb年龄谐和图（a）

    Figure 3. 

    下载: 全尺寸图片 幻灯片

    图 4  西准噶尔卡拉岗组火山岩岩石类型和系列划分图解

    Figure 4. 

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    图 5  卡拉岗组火山岩稀土元素球粒陨石标准化图解(a, 标准化值据Boyoton, 1984)和微量元素原始地幔标准化图解(b, 标准化值据Sun and McDonough, 1989)

    Figure 5. 

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    表 1  西准噶尔卡拉岗组火山岩锆石LA-ICP-MS U-Pb定年数据

    Table 1.  LA-ICP-MS zircon U-Pb dating results for Kalagang volcanic rocks in West Junggar

    下载: 导出CSV

    表 2  卡拉岗组火山岩主量元素（%）与微量元素（10-6）分析结果

    Table 2.  Major elements (%) and rare earth elements(10-6) of Kalagang Formation volcanic rocks

    下载: 导出CSV
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    尹继元, 陈文, 袁超, 张运迎, 龙晓平, 喻顺, 张彦, 李洁, 孙敬博. 2013.新疆西准噶尔晚古生代侵入岩的年龄和构造意义:来自锆石LA-ICP-MS定年的证据[J].地球化学, 42(5):414-429. http://d.old.wanfangdata.com.cn/Periodical/dqhx201305003

    赵泽辉, 郭召杰, 韩宝福, 王毅. 2006.新疆三塘湖盆地古生代晚期火山岩地球化学特征及其构造-岩浆演化意义[J].岩石学报, 22(1):199-214. http://d.old.wanfangdata.com.cn/Periodical/ysxb98200601020

    周涛发, 袁峰, 杨文平, 何立新, 谭绿贵, 范裕, 岳书仓. 2006.西准噶尔萨吾尔地区二叠纪火山活动规律[J].中国地质, 33(3):553-558. doi: 10.3969/j.issn.1000-3657.2006.03.011 http://geochina.cgs.gov.cn/geochina/ch/reader/view_abstract.aspx?file_no=20060311&flag=1

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收稿日期:  2016-10-04
修回日期:  2017-02-03
刊出日期:  2018-12-25

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