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首页> 外文期刊>Stratigraphy >Lithologies, ages, and provenance of clasts in the Ordovician Fincastle Conglomerate, Botetourt County, Virginia, USA
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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

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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
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  • 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;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地质学;
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