| 胶东蓬家夼金矿区钾玄质煌斑岩的元素地球化学研究 |
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| 引用本文： | 程小久,程景平.胶东蓬家夼金矿区钾玄质煌斑岩的元素地球化学研究[J].地球化学,1998,27(1):91-100. |
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| 作者姓名： | 程小久 程景平 |
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| 作者单位： | 中国科学院广州地球化学研究所!广州，510640 |
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| 摘 要： | 胶东蓬家夼金矿区钾玄质煌斑岩的元素地球化学研究表明，其成分上具有高碱富钾，高铝低钛，大离子亲石元素和轻稀土元素强烈富集及相容元素（Ｃｒ，Ｃｏ，Ｎｉ）明显亏损等特点，钾玄质岩浆是由富集地幔通过批式部分熔融作用产生的，而且其原始岩浆在上升和侵位过程中存在橄榄石和辉石等矿物相分离结晶，并伴有陆壳物质的混染，本区煌斑岩具有与陆弧有关的钾质火成岩类似的地球化学特征，可能与燕山期伊泽奈崎洋向中国东部大陆下的俯
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| 关 键 词： | 钾玄质煌斑岩 元素地球化学 煌斑岩 金矿床 |
ELEMENT GEOCHEMISTRY OF SHOSHONITIC LAMPROPHYRES IN THE PENGJIAKUANG GOLD DISTRICT,SHANDONG PROVINCE, CHINA |
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| Cheng Xiaojiu, Cheng Jingping, Wang Jianghai.ELEMENT GEOCHEMISTRY OF SHOSHONITIC LAMPROPHYRES IN THE PENGJIAKUANG GOLD DISTRICT,SHANDONG PROVINCE, CHINA[J].Geochimica,1998,27(1):91-100. |
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| Authors: | Cheng Xiaojiu Cheng Jingping Wang Jianghai |
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| Abstract: | The shoshontic lamprophyres in the Pengjiakuang gold district are characterized by high alkaline, high K_2O / Na_2O ratios, low TiO_2, high and variable Al_2O_3, a strong enrichment in LILE and LREE, and distinct depletion in comparable element (Cr, Co and Ni). These geochemical characteristics clearly indicate that they were derived from the batch partial melting of the enriched mange and fractional crystallization of olivine and clinopyroxene. Based on the geochemical discrimination diagrams proposed by Muller (1993), the shoshonitic lamprophyres were formed in the continental are setting,and could be related to the subduction of Izanaqi oceanic plate beneath the continent of East China in the Yanshanian Period. |
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| Keywords: | shoshonictic lamprophyres element geochemistry Shandong Province |
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