| 赣西北基性岩脉的地质地球化学特征及其意义 |
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| 引用本文： | 谢桂青,胡瑞忠,贾大成.赣西北基性岩脉的地质地球化学特征及其意义[J].地球化学,2002,31(4):329-337. |
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| 作者姓名： | 谢桂青 胡瑞忠 贾大成 |
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| 作者单位： | 1. 中国科学院地球化学研究所矿床开放实验室,贵州贵阳,550002;中国科学院研究生院,北京,100039
2. 中国科学院地球化学研究所矿床开放实验室,贵州贵阳,550002 |
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| 基金项目： | 中国科学院知识创新工程重要方向项目(KZCX2-102)，国家杰出青年科学基金(49925309) |
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| 摘 要： | 对赣西北三个地区基性岩脉的地质地球化学特征进行了研究，并初步讨论了基性脉岩的成岩方式和源区性质。基性岩脉包括闪斜煌斑岩，辉绿岩和橄榄录玢岩。微量元素相对富集大离子亲石元素，而亏损高场强元素，具有Nb,Ta和Ti异常。武山煌班岩稀土元素总量高，明显富集轻;益口辉绿岩稀土元素总量低，略微富集轻稀土元素，上高橄榄辉绿玢岩介于两者之间，三者都无明显的铕异常，结合基性脉岩的地球化学分析可知，三者的岩石化学变化受到部分熔融和分离结晶所控制，武山煌斑岩和上高橄榄辉绿玢岩明显发生分离结晶作用，而隘口辉绿岩主要受部分熔融作用影响。其源区可能为与俯冲流体有关的富集地幔，有待于进一步研究。
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| 关 键 词： | 地球化学 成岩方式 源区性质 基性岩脉 江西 稀土元素 |
| 文章编号： | 0379-1726(2002)04-0329-09 |
| 修稿时间： | 2001年5月30日 |
Geological and geochemical characteristics and its significance of mafic dikes from Northwest Jiangxi Province |
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| XIE Gui qing,HU Rui zhong,JIA Da cheng.Geological and geochemical characteristics and its significance of mafic dikes from Northwest Jiangxi Province[J].Geochimica,2002,31(4):329-337. |
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| Authors: | XIE Gui qing HU Rui zhong JIA Da cheng |
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| Institution: | XIE Gui qing1,2,HU Rui zhong1,JIA Da cheng1 |
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| Abstract: | Geology and geochemistry of mafic dikes from three areas in Northwest Jiangxi Province are studied, and their diagenetic models and source characteristics are preliminarily discussed. The mafic dikes include spessartite and diabase and olivine diabase porphyry. The trace elements of the mafic dikes are characterized by relative enrichment of large ion lithophile elements and depletion of high field strength elements, and negative Nb and Ta and Ti anomaly. In the diagram of chondrite normalized rare earth element patterns, the lamprophyres of the Wushan copper deposit are enriched in total rare earth elements and obviously enriched in light rare earth elements, and total REEs of Aikou diabases are low, slightly enriched in LREEs, and the mafic dikes of Shanggao have intermediate total REEs and enrichment degrees of LREEs between Wushan and Aikou. The mafic dikes from all the three areas have slightly Eu anomalies. The geochemical characteristics of mafic dikes indicate that the mafic dikes from the three areas are mainly controlled by partial melting and fractional crystallization process. The Wushan lamprophyres and Shanggao olivine diabase porphyry experienced fractional crystallization process, and the Aikou diabase influenced by partial melting process. The source of the studied mafic dikes may be the enrichment mantle that was modified by subduction metasomatic fluids. |
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| Keywords: | geochemistry diagenetic models source characteristics mafic dikes Jiangxi Province |
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