| 甘肃红石山地区白山组火山岩地质特征及构造背景 |
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| 引用本文： | 黄增保,金霞.甘肃红石山地区白山组火山岩地质特征及构造背景[J].甘肃地质学报,2006,15(1):19-24. |
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| 作者姓名： | 黄增保 金霞 |
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| 作者单位： | 甘肃省地质调查院 甘肃兰州730000 |
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| 基金项目： | 中国地调局甘肃1∶25万红宝石幅区域地质调查(项目编号200213000020)的成果 |
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| 摘 要： | 早石炭世白山组火山岩是甘肃北山地区分布最为广泛的晚古生代火山岩。岩石学、地球化学研究表明,白山组火山岩主要为钙碱性系列,相容元素和大离子亲石元素(如Rb、Sr、Ba)相对富集,高场强元素(如Nb、Ta、Ti、Zr、Hf等)相对亏损,轻稀土富集,负铕异常,具有陆缘弧火山岩的一般特征。结合区域构造,作者认为白山组火山岩形成陆缘弧环境,其形成与早石炭世红石山洋向塔里木板块俯冲有关。
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| 关 键 词： | 红石山地区 白山组 地球化学 陆缘弧 |
| 文章编号： | 1004-4116（2006）01-0019-0006 |
| 收稿时间： | 2005-11-01 |
GEOLOGICAL CHARACTERISTICS AND ITS SETTING
FOR VOLCANIC ROCKS OF BAISHAN FORMATION
IN HONGSHISHAN AREA OF GANSU PROVINCE |
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| HUANG Zen-Bao and JIN Xia.GEOLOGICAL CHARACTERISTICS AND ITS SETTING
FOR VOLCANIC ROCKS OF BAISHAN FORMATION
IN HONGSHISHAN AREA OF GANSU PROVINCE[J].Acta Geologica Gansu,2006,15(1):19-24. |
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| Authors: | HUANG Zen-Bao and JIN Xia |
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| Institution: | Geological Survey of Gansu Province, Lanzhou 735000, China |
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| Abstract: | Volcanic rocks of early Carboniferous Baishan Formation were widely distributed in the Beishan area of Gansu Province.Based on the studies of petrology and geochemistry,volcanic rocks of Baishan Formation have the characteristics of continental intraplate and continent margin arc which were calc alkaline series and enriched relatively in large ion lithophile elements(Rb,Sr,Ba etc)and high field strength elements(Nb,Ta,Ti,Zr,Hf etc)and unconspicuous Eu negative abnormality,combined with the study of regional structures and geochemistry of volcanic rocks of Baishan Formation,it were generated island arc sitting,which were directly associated with the subduction of the Hongshishan plate beneath the Talimu plate during early Carboniferous period. |
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| Keywords: | Hongshishan area Baishan Formation Geochemistry Island arc sitting |
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