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从相军,李海宾,胡建超,郑锋.山东沂源橄榄玄武岩地球化学特征[J].山东国土资源,2019,35(1):
山东沂源橄榄玄武岩地球化学特征
Geochemical Characteristics of Olivine Basalt in Yiyuan County of Shandong Province
  
DOI:10.12128/j.issn.1672-6979.2019.01.005
中文关键词:  找矿指示矿物  橄榄玄武岩  金刚石  成矿地质条件  山东沂源
英文关键词:Ore prospecting indicator  olivine basalt  diamond  oreforming geological conditions  Yiyuan county in Shandong province
基金项目:
作者单位
从相军 中国建筑材料工业地质勘查中心山东总队 
李海宾 中国建筑材料工业地质勘查中心山东总队 
胡建超 中国建筑材料工业地质勘查中心山东总队 
郑锋 中国建筑材料工业地质勘查中心山东总队 
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中文摘要:
      在山东沂源地区进行金刚石矿远景调查时发现超基性岩体,经岩矿鉴定为橄榄玄武岩。通过人工重砂,选获大量的金刚石找矿指示矿物。该文运用岩矿鉴定、化学分析、稀土元素分析,指示矿物铬铁矿电子探针微区分析,对岩体进行了研究,结果表明,岩体具有富铁、富镁的特征,岩石里特曼指数介于3.60~5.40之间,根据划分标准,调查区橄榄玄武岩为钙碱性—碱性岩。岩石固结指数(SI)介于35.21~47.15之间,显示岩浆分异程度中等;金刚石找矿指示矿物铬铁矿来自金刚石原生矿母岩岩体;橄榄玄武岩岩体REE总量偏低,轻稀土富集,重稀土含量偏低,轻重稀土分馏十分明显,没有明显的Eu异常。橄榄玄武岩化学成分与蒙阴地区金伯利岩化学成分、伴生矿物、稀土元素具有相似性。因此,它们在成因上应该具有内在联系,应属于同一构造环境下岩浆活动的产物。
英文摘要:
      The ultrabasic rock body was discovered in the area for prospecting diamond deposits in the investigation area. A large number of diamond indicator minerals have been selected from artificial heavy sand. In this paper, rock mass identification, chemical analysis, rare earth element analysis and indicative mineral chromite are used to analyze the rock mass by electron probe microanalysis. It is showed that the rock mass has the characteristics of rich iron and magnesium rich, and the Litman index of rock is between 3.60 and 5.40. According to the standard, the olivary basalt in investigation area is calc alkaline—alkaline rock. The consolidation index of rock (SI) is between 35.21 and 47.15. It is indicated that the degree of magma differentiation is medium, and the mineral chromium prospecting mineral chromium is found. The iron ore is derived from the primary rock mass of the diamond. The rare earht element of the olivine basalt rock mass is low, the light rare earth is enriched, the heavy rare earth content is low, the fractionation of heavy and heavy rare earth is very obvious, and there is no obvious Eu anomaly. The chemical composition of the olivine basalt is similar to chemical composition, associated minerals and rare earth elements of the kimberley rock in Mengyin area. Therefore, they should be related to the origin of magmatic activity in the same tectonic environment.
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