| 杨占兴,骆念岗.辽东桓仁西部小岭旋回火山岩地球化学特征及成因[J].地质找矿论丛,2015,30(4):567-574 |
| 辽东桓仁西部小岭旋回火山岩地球化学特征及成因 |
| Characterristics and genesis of Xiaoling cycle volcanic rock in the western Huanren area in the East Liaodong province |
| 投稿时间：2015-03-23 |
| DOI：10.6053/j.issn.1001-1412.2015.04.013 |
| 中文关键词: 桓仁 小岭旋回 地球化学特征 成因 构造背景 辽宁省 |
| 英文关键词:Huanren Xiaoling cycle The geochemistry genesis Tectonic background Liaoning province |
| 基金项目:辽东-吉南成矿带地质矿产调查项目(编号:1212011120733)资助。 |
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| 中文摘要: |
| 小岭旋回火山岩是辽东中生代火山岩的重要组成部分,主要岩性有安山岩、英安岩以及流纹质火山碎屑岩,属钾质钙碱性系列。其地球化学特征显示,火山岩总体具有高K、Na,低Al、Fe、Ca的特点。其中,火山熔岩具有富集Nb、Th、Hf、Zn,相对亏损Cs、Li、Sr的特点;火山碎屑岩普遍具贫Sr、V、Cu、Li,富含Hf的特点。火山岩总体为稀土富集型,安山岩及安山质火山碎屑岩,略显Eu正异常;流纹岩及流纹质火山碎屑岩具明显Eu负异常。火山岩成岩物质来源于地壳,成因以部分熔融为主,部分岩石显示具陆壳混染特点。火山岩形成动力来自于太平洋板块向古欧亚板块的俯冲,形成于早期拉张-晚期挤压的构造背景,具有板内活动带火山岩的特征。 |
| 英文摘要: |
| The Xiaoling cycle volcanic rock is an important part of Mesozoic volcannic rocks in the East Liaoning province. It belongs to high-K and calc-alkaline series consisting of mainly andesite, dacite and rhyolitic pyroclastic rocks. Geochemically, the cycle is characterized by high K, Na and low Al, Fe, Ca; the volcanic lava in the cycle by enrichment of Nb, Th, Hf, Zn and relative depletion of Cs, Li, Sr; the volcanic clastic rocks by enrichment of Hf and poor Sr, V, Cu, Li. The cycle is generally rich in REE. The andesite and andesitic volcanic clastic rocks show slight positive Eu anomaly; the rhyolite and rhyolitic pyroclastic rocks obvious negative Eu anomaly. Comprehensive studies have shown that the material source of Xiaoling cycle volcanic rocks is from the earth's crust with the main partial melting genesis and some rock is characterized by dissemination of continental material dissemination. Dynamically, the volcanics are formed by the subduction of the Pacific plate to the Eurasian plate under the early tension-late extrusion tectonic background and characterized by the volcanic rocks of intro-plate mobile belt. |
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