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首页> 外文会议>Keck Research Symposium in Geology >PROVENANCE ANALYSIS OF THE WAPITI FORMATION (EOCENE) SANDSTONE IN THE ABSAROKA BASIN, WY USING DETRITAL ZIRCON GEOCHRONOLOGY
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PROVENANCE ANALYSIS OF THE WAPITI FORMATION (EOCENE) SANDSTONE IN THE ABSAROKA BASIN, WY USING DETRITAL ZIRCON GEOCHRONOLOGY

机译：Wy使用Detrital Zircon地理学的Wapiti形成（eocene）砂岩的种源分析

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摘要

The transition from Laramide s?ntectonic sedimentation of the Lower Eocene Willwood formation to the post-Laramide volcanogenic sedimentation of the Middle Eocene Wapiti Formation was studied in the upper South Fork Shoshone River Valley, Wyoming. To better understand the regional age, paleogeography and provenance of volcaniclastic sandstones in the lower stratified member of the Wapiti Formation, we sampled three units for detrital zircon geochronol-ogy (n=241). The age for the sandstone units for the lowermost, middle, and uppermost units are 49.5, 48.8. and 48.8 respectively, which is consistent with previous geochronologic and paléontologic studies. These ages also are consistent with rocks deposited immediately prior to Heart Mountain Faulting. Detrital zircon spectra show a transition from a mixed (recycled?) provenance consistent with drainage from the west with minor primary Eocene volcanic contributions to one dominated by primary Eocene and Archean contributions from the northern Absaroka volcanoes and the Laramide Beartooth Uplift.
机译：在南叉肖斯河谷，怀俄明州上南叉河河谷研究了从Laramide S的转变为下何艾氏乳酸的沉淀到中毒性的后拉米氏植物沉积物。为了更好地了解区域年龄，古地理和从Wapiti系的下分层成员中的火山砂岩出现，我们对碎屑锆石的三个单位进行了采样的（n = 241）。最下部，中间，最上部单位的砂岩单元的年龄为49.5,48.8。和48.8分别与以前的地质族和腭性研究一致。这些年龄段也与在心脏山断线之前立即沉积的岩石一致。 Detrital锆石光谱显示出从混合（再生的？）的过渡，与西方的引流有较小的原发性农产病人贡献，以北部赤芍和Laramide Beartooth隆起为主导的原发性农村和Archean贡献。

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