• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Stratigraphy >Lithologies, ages, and provenance of clasts in the Ordovician Fincastle Conglomerate, Botetourt County, Virginia, USA
【24h】

Lithologies, ages, and provenance of clasts in the Ordovician Fincastle Conglomerate, Botetourt County, Virginia, USA

机译：美国弗吉尼亚州弗吉尼亚州博斯托尔郡Clasts的岩石，年龄和物质的碎石，年龄和出处

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The Fincastle Conglomerate is an Ordovician polymictic, poorly sorted, matrix-and clast-supported cobble to boulder-rich conglomerate located just north of Fincastle, Botetourt County, VA. At least nine other cobble and boulder conglomerates are located in a similar stratigraphic position from Virginia to Georgia west of the Blue Ridge structural front. All except the Fincastle are dominated (similar to 80%) by carbonate clasts; Fincastle clasts are much more varied and siliceous and it is this clast diversity that provides increased value for provenance and related studies. We have used a multidisciplinary approach that involves conodont analysis, sandstone petrography, in-situ outcrop clast characterization, optical petrography, electron-beam petrography and chemical analysis, and X-ray diffraction to provide data on lithologies, ages, and provenance. The size, roundness, and lithology of 1,656 clasts ( 1 cm) were measured in the field. Although, the clast lithology varies among the studied localities, the average lithology is sandstone and siltstone 12 %, vein quartz 17 %, limestone 31 %, low-grade quartzite/metasandstone 31 %, chert 6 %, and others 3 %. Dolomite, igneous, or high-grade metamorphic rock clasts were not identified in field study or in detailed laboratory analysis. Dolomite rhombs and authigenic albite feldspar were observed in some limestone clasts. Quantitative petrographic data for the Fincastle sandstone clasts indicate tectonic environments from passive margin to transitional continental uplift, but the conglomerate matrix modes have considerably less feldspar and plot in the foreland basin tectonic environment region. Proto-, para-, and euconodonts were identified from clast and matrix, but are long-ranging fauna indicating middle Cambrian to Middle or Late Ordovician ages; color alteration index (CAI) for euconodonts varied from 3 to 3.5. The occurrence of well-rounded clasts including limestone suggests a nearby, high-energy environment
机译：Fincastle Conglomerate是一个奥陶语，巨大的分类，富有的富含卵石的鹅卵石，富裕的集团，位于博尔特库特县弗朗斯特郡北部的北部北部。至少九个其他鹅卵石和巨石集团位于从弗吉尼亚到蓝岭结构前沿的格鲁吉亚的类似地层位置。除了Fincastle外，所有这些都是碳酸碎屑的统治（类似于80％）; Fincastle Clasts更加多样化和硅质，这是这种Clast多样性，为出处和相关研究提供了增加的价值。我们使用了多学科方法，涉及巩膜分析，砂岩岩体，原位露头夹子表征，光学透视，电子束岩体和化学分析，以及X射线衍射，为岩性，年龄和物质提供数据。在该领域中测量1,656氯砂（＆ 1cm）的尺寸，圆度和岩性。虽然，Clast岩性在研究的地方变化，平均岩性是砂岩和硅铁铁12％，静脉石英17％，石灰石31％，低级石英石/ Metasandstone 31％，Chert 6％，其他3％。在现场研究中或在详细的实验室分析中没有发现白云石，火油或高档变质岩夹层。在一些石灰石泥炭中观察到白云石rhombs和Aheyigenic Albite Feldspar。 Fincastle砂岩Clast的定量岩体数据表示来自无源裕度到过渡欧式隆起的构造环境，但在前陆盆地构造环境区域中的集体基质模式具有相当较少的长桥和绘图。从Clast和Matrix中鉴定了ProPO-，段和桉树，但是长距离的动物群，表明中际或晚奥奥陶氏郡年龄的年龄;桉树的颜色改变指数（CAI）从3到3.5变化。包括石灰石在内的圆圆形泥浆的发生表明附近的高能量环境

著录项

  • 来源
    《Stratigraphy》 |2018年第1期|共20页
  • 作者

    Belkin Harvey E.; Repetski John E.; Dulong Frank T.; Hickling Nelson L.;

  • 作者单位

    US Geol Survey 11142 Forest Edge Dr Reston VA 20190 USA;

    US Geol Survey MS 926A 12201 Sunrise Valley Dr Reston VA 20192 USA;

    US Geol Survey MS 956 12201 Sunrise Valley Dr Reston VA 20192 USA;

    US Geol Survey 604 Spring Creek Dr Ashland OR 97520 USA;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地质学;
  • 关键词

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