| 甘肃省榆中地区中元古代兴隆山岩群火山岩地球化学特征及构造环境 |
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| 引用本文： | 施彬,朱云海,寇晓虎,张克信,林启祥,樊光明.甘肃省榆中地区中元古代兴隆山岩群火山岩地球化学特征及构造环境[J].地质科技情报,2007,26(2):45-50. |
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| 作者姓名： | 施彬 朱云海 寇晓虎 张克信 林启祥 樊光明 |
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| 作者单位： | 1. 中国地质大学研究生院,武汉,430074;湖北省地质调查院,武汉,430030
2. 中国地质大学地球科学学院,武汉,430074 |
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| 基金项目： | 中国地质调查局项目“临夏市幅（I48C001001）、定西县幅（I48C001002）1：25万数字区域地质调查”（200413000007）野外工作期间,得到张克信、朱云海、林启祥、樊光明、向树元等老师的指导,参加野外工作的还有孙赜、骆满生、雷东宁、马新民、路玉林、罗根明、徐亚东、张毓森、贺国强、唐富贵等,在此表示衷心的感谢. |
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| 摘 要： | 分布于甘肃省榆中县兴隆山地区的兴隆山岩群为一套浅变质火山岩与浅变质碎屑岩所组成的岩石组合，其火山岩主要出露于兴隆山岩群中岩组和上岩组。兴隆山岩群火山岩岩性主要为变质玄武岩,具有低w（K2O）、w（Na2O＋K20）和w（TiO2）的特点，且w（TiO2）和w（P2O5）接近于洋中脊玄武岩的平均质量分数，为亚碱性的拉斑玄武岩系列，火山岩稀土元素总量低，轻、重稀土元素分馏不明显，稀土元素配分曲线为轻稀土元素略亏损、重稀土元素平坦型，与洋中脊玄武岩的配分曲线类似，火山岩大离子亲石元素相对富集，高场强元素和重稀土元素平坦，稀土元素、微量元素特征及构造环境判别显示兴隆山岩群的火山岩形成于中元古代秦祁昆多岛洋中部略富集的E型洋中脊的海底扩张环境。
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| 关 键 词： | 兴隆山岩群 火山岩 构造环境 洋中脊玄武岩 甘肃省 |
| 文章编号： | 1000-7849(2007)02-0045-06 |
| 修稿时间： | 2006-05-09 |
Geochemical Features and Tectonic Environment of Mesoproterozoic Xinglongshan Group Volcanic Rocks in Yuzhong Area, Gansu Province |
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| SHI Bin,ZHU Yun-hai,KOU Xiao-hu,ZHANG Ke-xin,LIN Qi-xiang,FAN Guang-ming.Geochemical Features and Tectonic Environment of Mesoproterozoic Xinglongshan Group Volcanic Rocks in Yuzhong Area, Gansu Province[J].Geological Science and Technology Information,2007,26(2):45-50. |
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| Authors: | SHI Bin ZHU Yun-hai KOU Xiao-hu ZHANG Ke-xin LIN Qi-xiang FAN Guang-ming |
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| Institution: | 1. Graduate School ;2. Faculty of Earth Sciences, China University of Geosciences , Wuhan 430074, China; 2. Hubei Institute of Geological Survey, Wuhan 430030, China |
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| Abstract: | The Xinglongshan Group exposed in the Yuzhong area, Gansu Province is a sequence of slightly metamorphosed volcano-sedimentary rocks.They mainly occur in the middle and upper formations of the Xinglongshan Group,and their lithology is dominated by meta-basalt.The Xinlongshan meta-basalts have low w(K2O),w(Na2O+K2O) and w(TiO2) contents,with w(TiO2)/ w(P2O5) ratio close to that of average mid-ocean ridge basalts,which characterize sub-alkaline tholeiitic baslt.With low REE abundances,they show no significant light/heavy REE fractionation,with slightly depleted light REE and flat heavy REE distribution,which resemble those of mid-ocean ridge basalts.Large ion lithophile elements are relatively enriched,while high filed strength elements and heavy REE show flat distribution patterns.Collectively,REE,trace element and tectonic setting discrimination indicate that the Xinglongshan volcanic rocks are formed in a E-type mid-ocean spreading center located in the middle part of the Qin-Qi-Kun Ocean. |
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| Keywords: | Xinglongshan Group volcanic rock tectonic setting mid-ocean ridge basalt Gansu Province |
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