| 内蒙古中南部出露地壳元素丰度值的估算 |
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| 引用本文： | 孟月玥,陈岳龙,林宇,等.内蒙古中南部出露地壳元素丰度值的估算[J].地质通报,2010,29(6):880-890. |
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| 作者姓名： | 孟月玥 陈岳龙 林宇 等 |
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| 作者单位： | 1. 中国地质大学(北京)地球科学与资源学院,北京,100083
2. 内蒙古自治区地质调查院,内蒙古,呼和浩特,010010 |
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| 基金项目： | 内蒙古国土资源厅院士项目 |
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| 摘 要： | 运用区域大规模采样方法,对内蒙古中南部地区所采样品进行元素丰度值加权计算,这是建立区域地壳模型的基础工作之一,同时也为化探异常的检出提供较为准确的背景值。研究区涉及内蒙古地轴和内蒙古中部造山系2个构造单元。采用加权求平均值的方法,得到内蒙古中南部出露地壳10种常量元素氧化物和40种微量元素的丰度值。经地表热流值、地震平均波速和元素比值方法检验后证明所得结果合理。计算所得内蒙古中南部出露地壳平均成分为花岗闪长质,与目前一般认为的结论相同。将结果与其他地区进行比较分析后可知,内蒙古中南部出露的地壳与全球上地壳的组成基本一致。由微量元素、稀土元素的图解和内蒙古中南部出露地壳的元素丰度与中国东部出露地壳元素丰度的对比可以看出,整体上,内蒙古中南部具有较强的壳内分异作用和地壳增生作用(地幔物质加入)。
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| 关 键 词： | 内蒙古中南部 出露地壳 元素丰度 |
Estimated element abundance values of the exposed crust of southern-central Inner Mongolia, China. |
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| MENG Yue-yue,CHEN Yue-long,LIN Yu,et al..Estimated element abundance values of the exposed crust of southern-central Inner Mongolia, China.[J].Geologcal Bulletin OF China,2010,29(6):880-890. |
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| Authors: | MENG Yue-yue CHEN Yue-long LIN Yu |
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| Abstract: | Elemental abundance values estimation of the exposed crust in southern-central Inner Mongolia by means of large-scale sampling in the region, is a basic work for model establishment of the crustal composition. It can also provide the background values for geochemical exploration. The study area includes two tectonic units, respectively northern margin of Inner Mongolia Axis and the Central Inner Mongolia Orogenic Belt. Trough weighted values method, we've estimated elemental values of 10 major elements and 40 trace elements. The estimated values are proved reasonable by surface heat flow value, and average seismic wave velocity and elements ratios. The estimated average chemical composition of the exposed crust of Inner Mongolia belongs to granodioritic, which is agreed by most researchers. Through comparison with global average composition, the exposed crustal elemental abundance values of Inner Mongolia are similar to the average values. From the diagrams of trace and rare earth elements and comparison with the elemental abundance values of eastern China, we conclude that there is strong crust differentiation and accretion of the whole southern-central Inner Mongolia. |
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| Keywords: | southern-central Inner Mongolia exposed crust elemental abundance values |
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