• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International Journal of Geosciences >Tarkwaian Deposits of the Birimian Belt of Houndé: Petrological, Structural and Geochemical Study (Burkina-Faso, West Africa)
【24h】

Tarkwaian Deposits of the Birimian Belt of Houndé: Petrological, Structural and Geochemical Study (Burkina-Faso, West Africa)

机译：猎犬的比里米亚半岛带的塔克瓦期沉积：岩石学，结构和地球化学研究（西非布基纳法索）

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The Tarkwaian deposits of the Birimian belt of Houndé are located in the Baoule-Mossi Paleoproterozoic area of the West African Craton. The sedimentary units consist of sandstone heterometric pelitic feldspthic sandstone with locally interbedded breccias, puddings and polygenic conglomerates. Lithic pebbles and macroscopic fragments that are similar to vein type originated quart castings and andesitic-dacitic projections, felsic sub-volcanic rocks evolving from microdioritic to microgranite composition are detected in terrigenous sediments. The volcanic packages form a linear strip composed of basic to intermediate rocks and andesitic to dacitic?volcaniclastites. The contacts between these units are not clearly exposed but the different facies between the polygenic conglomerates and sandstones show discordant tectonic contacts with the Tarkwaian and the Birimian. The geochemical nature of these Tarkwaian formations is strongly influenced by the relative decline of the dominant quartz of feldspars and phyllites. The improperly classified and immature feldspathic sandstones show context affinities of island arc probably dictated by Birimian lithic products. Sedimentologically, the cross-bedded stratification and the predominance of sandstone terrigenous lands indicate a deposition in a fluvio-deltaic hydrodynamic setting along intermontane Birimian rift. The similarities between these Tarkwaian formations and the typical Tarkwaian of the Tarkwa basin in Ghana are probably limited to petrographic and not stratigraphic aspects, which lead to likening them to flyscho?d or molassic tardi Birimian deposits.
机译：Houndé的Birimian带的Tarkwaian矿床位于西非克拉通的Baoule-Mossi古元古生界。沉积单元由砂岩异质性长统长石砂岩组成，局部夹有角砾岩，布丁和多基因砾岩。岩石卵石和宏观碎屑类似于脉型起源的夸脱铸件和安山岩—达特古特的投影，在陆源沉积物中检测到从微闪长岩到微花岗岩的演化的长英质次火山岩。火山岩包裹形成由基本岩体到中间岩体和安山岩体到胶泥岩体到火山岩体的线性条带。这些单元之间的接触没有清楚地暴露出来，但是多源砾岩和砂岩之间的不同相显示出与塔克瓦纪和比里米亚岩不协调的构造接触。这些Tarkwaian地层的地球化学性质受长石和页岩的优势石英相对下降的强烈影响。分类不当，未成熟的长石砂岩显示岛弧的背景亲和力可能是由Birimian岩性产物决定的。在沉积学上，层状分层和砂岩陆源地带的优势表明，在沿山间Birimian裂谷的河流-三角洲水动力环境中沉积。这些Tarkwaian地层与加纳Tarkwa盆地的典型Tarkwaian之间的相似之处可能仅限于岩石学而不是地层学方面，这导致它们比拟成飞散性或含糖浆的tardi Birimian沉积。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号