首页 | 本学科首页   官方微博 | 高级检索  
     检索      

贵州省镇远地区钾镁煌斑岩岩石特征
引用本文:罗会文,杨光树.贵州省镇远地区钾镁煌斑岩岩石特征[J].岩石矿物学杂志,1989,8(2):97-109.
作者姓名:罗会文  杨光树
作者单位:贵州地矿局101地质大队 (罗会文),贵州地矿局101地质大队(杨光树)
摘    要:贵州省镇远地区的钾镁煌斑岩(Lamproite)的分布在大地构造上受地台和地台内隆起与坳陷间的深断裂控制,为浅成侵入脉岩,呈岩墙或岩床产出,规模不大,厚几厘米至数米,长数十米至千米,已见于深冲、白坟、思南塘等岩群。岩石具煌斑结构,块状构造,斑晶为钛金云母、透辉石、假像橄榄石,基质除上述矿物外,还有透长石、白榴石、角闪石、磷灰石、锆石、金红石等,还见到微量镁铝榴石和铬铁矿。其中钛金云母、铬铁矿、镁铝榴石的矿物化学成分与西澳同类岩石十分接近,投入米切尔,J·格尼有关图件中,均落入钾镁煌斑岩趋势区。岩石化学成分属钾质超基性岩,K_2O>Na_2O,K_2O/Na_2O为20.85~66.51,富含TiO_2,但MgO较西澳同类岩石略低。富含Sr、Ba、Zr、Nb、P等痕量元素。稀土总量高,富集轻稀土。稀土分配模式与西澳同类岩石一致。D_5岩体中经1987年再次选矿证实含微量金刚石。

关 键 词:钾镁煌斑岩  岩石特征

The Characteristics of Lamproite in Zhenyuan Area, Guizhou
Luo Huiwen Yang Guangshu.The Characteristics of Lamproite in Zhenyuan Area, Guizhou[J].Acta Petrologica Et Mineralogica,1989,8(2):97-109.
Authors:Luo Huiwen Yang Guangshu
Abstract:The lamproites in Zhenyuan area, Guizhou, are structurally confined to the deep faults in the platform or the platformal fold belts. They are the hypabysal intrusions and occured as a dike or a sheet ranging from several centimetres to several metres thick and tens to thousand metres long in the Shenchong, Baifen and Sinantang complexes. The rocks, as a whole, display distinct lamprophyric textures and massive structures with porphyritic crystals of Ti-phlogopite, diopside and pseudo-olivine. The matrix minerals, except that mentioned above, are consisted of sanidine, leucite, amphibole, apatite, zircon, rutile as well as a few pyrope and chromite, The compositions of phlogo- pite, chromite and pyrope are similar to that of lamproites from West Australia, which in Mycher, J. Geny diagram are plotted to the area of lamproite. These rocks petrochemically belong to the potash-ultramafic and characterized by K2O>Na20, K2O/Na2O=20.85--66,51.They have a higher content of REE and the REE patterns display an enrichment of LREE, which are similar to that of Vest Australia. The experiment of mineral separation indicated that there is a small amount of diamond in the D5 body,
Keywords:lamproite  phlogopite  pyrope  chromite  rutile  
本文献已被 CNKI 维普 等数据库收录!
点击此处可从《岩石矿物学杂志》浏览原始摘要信息
点击此处可从《岩石矿物学杂志》下载免费的PDF全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号