文章摘要
张艳飞.辽东硼矿区层状混合岩的地质地球化学 特征及其成因探讨[J].地质与勘探,2009,45(5):549-557
辽东硼矿区层状混合岩的地质地球化学 特征及其成因探讨
Study on the Genesis and Geological and Geochemical Characteristics of LayeredMigmatites in East Liaoning, China
投稿时间：2009-04-21  修订日期：2009-07-01
DOI：
中文关键词: 层状混合岩 辽东硼矿区 岩石成因 重熔交代
英文关键词: the layered migmatites, boron deposit in east Liaoning, the origin of rocks, anatexis and metasomatism
基金项目:辽宁省国土资源厅基金(2006)项目的资助。
作者单位
张艳飞 辽宁工程技术大学,阜新 
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中文摘要:
      [摘要]辽东硼矿区层状混合岩为含硼岩系的一个重要组成部分,与各种变粒岩和浅粒岩呈整合 接触而呈层状展布,在岩性上有过度现象。岩石中交代结构发育;与变质围岩相比,混合岩的SiO2 、 K2 O、Na2 O 等组分均明显增加,而Fe2 O3 +FeO、CaO、MgO、MnO 等组分明显减少,K2 O/ Na2 O 变化较复杂, 岩石化学成分的变化与交代作用有关;微量元素具有与围岩相似的特征,稀土元素含量高于围岩,稀土 元素配分模式与变粒岩一致,具有典型的重熔特征。这些特征表明层状混合岩是变质围岩经选择重熔 交代而形成的。
英文摘要:
      Abstract:The layered migmatites of boron deposit in east Liaoning is an important component part of the boron-bearing strata, which conformably contactes with various granulites and leucolepitites, and shows transition in lithofacies. Residual crossbedding can be observed within transitional layers between striated hornblende migmatites and granulites. There are widely developed metasomatic textures. Compared with the metamorphic well-rocks, the major elements such as SiO2 , K2 O and Na2 O are significantly increased, meanwhile such as Fe2 O3 +FeO, CaO, MgO and MnO are distinctly decreased, K2 O/ Na2 O is in complex change. The difference among petrochemical compositions in the layered migmatites is obvious and is related to metasomatism. Trace element distribution of migmatites is similar to that of metamorphic well-rocks, except that their REE content is higher than that of wall-rocks. The distributed pattern of REE is consistent with granulites, especially biotiteleptynite, and is of representative anatexis characteristics. The reason for this is that part of granulites melted and formed the layered migmatites. So the results indicated that the layered migmatites are produced by anatexis and metaso鄄 matism of metamorphic wall-rocks.
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