内蒙古大青山地区同盛茂晚石炭世火山岩的年代学、地球化学和Hf同位素研究及其地质意义
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摘要
华北北缘作为古亚洲洋闭合和演化的重要研究地区,一直受到学者们广泛关注。已有研究表明其晚古生代岩浆作用强烈,但以侵入岩为主,缺乏同期火山岩的报道。文章对华北北缘内蒙古大青山地区同盛茂拴马桩组上部的火山岩进行详细的LA-ICP-MS锆石U-Pb年代学、地球化学和Hf同位素研究。结果表明,同盛茂火山岩形成于晚石炭世末期(305 Ma),火山岩岩性为流纹质弱熔结凝灰岩,岩石发生强的高岭石化,具有相对低的REE总量、弱的Eu负异常以及低的重稀土(Y、Yb)含量,样品中原位锆石的εHf(t)值为-8.3~-4.0。综合资料表明,火山岩可能是由华北克拉通加厚的基底经部分熔融形成,并有幔源物质参与。结合最近报道的区域晚古生代火山岩研究资料,推测华北北缘晚古生代至少发生过两期火山活动:分别为305~290 Ma和278~261 Ma,且峰期在272 Ma。
The northern margin of North China Block(NCB) is a key region for exploring the closure and evolution of the Paleo-AsianOcean, which has attracted much attention. Previous research has shown that there exists intensive late-Paleozoicmagmatism which is composed almost entirely of intrusives and lack of coeval volcanic rocks. In this paper, we present detailedLA-ICP-MS zircon U-Pb ages, major and trace elements, and Hf isotopic compositions of the volcanic rocks from the upper part of theShuanmazhuang Formation, Tongshengmao of Daqinshan district in Inner Mongolia. LA-ICP-MS zircon U-Pb dating shows that thevolcanic rocks of the upper part of the Shuanmazhuang Formation were generated at 305 Ma. The volcanic rocks consist ofweakly-welded rhyolitic tuffs that suffered from intense kaolinization. These volcanic rocks have low REE contents with subtle negativeEu anomalies and show low HREE(e.g., Y, Yb) contents. They also have negative εHf(t) values ranging from-8.3 to-4.0. Thesecharacteristics suggest that they were likely generated from partial melting of the thickened NCB crustal basements, and with someinvolvement of mantle-derived magmas. In combination with the latest reports about the distribution of late Paleozoic volcanic rocks in the northern margin of NCB, it is inferred that there likely existed two stages of volcanism at least during the late-Paleozoic, with ages of 305~290 Ma and 278~261 Ma, and a peak volcanism at 272 Ma.
The northern margin of North China Block(NCB) is a key region for exploring the closure and evolution of the Paleo-AsianOcean, which has attracted much attention. Previous research has shown that there exists intensive late-Paleozoicmagmatism which is composed almost entirely of intrusives and lack of coeval volcanic rocks. In this paper, we present detailedLA-ICP-MS zircon U-Pb ages, major and trace elements, and Hf isotopic compositions of the volcanic rocks from the upper part of theShuanmazhuang Formation, Tongshengmao of Daqinshan district in Inner Mongolia. LA-ICP-MS zircon U-Pb dating shows that thevolcanic rocks of the upper part of the Shuanmazhuang Formation were generated at 305 Ma. The volcanic rocks consist ofweakly-welded rhyolitic tuffs that suffered from intense kaolinization. These volcanic rocks have low REE contents with subtle negativeEu anomalies and show low HREE(e.g., Y, Yb) contents. They also have negative εHf(t) values ranging from-8.3 to-4.0. Thesecharacteristics suggest that they were likely generated from partial melting of the thickened NCB crustal basements, and with someinvolvement of mantle-derived magmas. In combination with the latest reports about the distribution of late Paleozoic volcanic rocks in the northern margin of NCB, it is inferred that there likely existed two stages of volcanism at least during the late-Paleozoic, with ages of 305~290 Ma and 278~261 Ma, and a peak volcanism at 272 Ma.
引文
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王芳,陈福坤,侯振辉,等.2009.华北陆块北缘崇礼-赤城地区晚古生代花岗岩类的锆石年龄和Sr-Nd-Hf同位素组成[J].岩石学报,25(11):3057-3074.
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张拴宏,赵越,宋彪,等.2004.冀北隆化早前寒武纪高级变质区内的晚古生代片麻状花岗闪长岩-锆石SHRIMP U-Pb年龄及其构造意义[J].岩石学报,20(3):621-626.
张拴宏,赵越,刘健,等.2007.华北地块北缘晚古生代-中生代花岗岩体侵位深度及其构造意义[J].岩石学报,23(3):625-638.
张拴宏,赵越,刘建民,等.2010.华北地块北缘晚古生代-早中生代岩浆活动期次、特征及构造背景[J].岩石矿物学杂志,29(6):824-842.
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(1)内蒙古自治区地质局.1981.1:200000土默特右旗幅.