• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Geosphere >Magma-driven accommodation structures formed during sill emplacement at shallow crustal depths: The Maiden Creek sill, Henry Mountains, Utah
【24h】

Magma-driven accommodation structures formed during sill emplacement at shallow crustal depths: The Maiden Creek sill, Henry Mountains, Utah

机译：在浅地壳深度的窗台施加期间形成的岩浆驱动的住宿结构：犹他州亨利山脉梅登溪门槛

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

摘要

In areas of exceptional exposure, upper-crustal intrusions and their immediate wall rocks commonly preserve direct evidence of the emplacement, magma flow pathways, and strains associated with the intrusion process. Such excellent exposure is displayed by the Paleogene Maiden Creek intrusion—a small satellite body related to the Mount Hillers intrusive complex, Henry Mountains, Utah. An intermediate plagioclase-hornblende porphyritic magma was intruded into the Entrada Sandstone Formation at an estimated depth of ～3 km. The southern part of the intrusion is overlain by the newly identified Maiden Creek shear zone (MCSZ): a subhorizontal, top-to-the-WNW detachment formed at the contact with the overlying sandstone country rocks. From observations of both syn-emplacement deformation and the exposed intrusion geometries, it is proposed that the southern Maiden Creek intrusion comprises westerly derived, inclined sill sheets. Host-rock sandstones were sandwiched (～E–W constriction) between these intrusive bodies beneath the MCSZ. It is proposed that the MCSZ is a syn-emplacement magma-driven accommodation structure, with a shear sense antithetic to the magma flow direction, which played a critical role in accommodating the westerly derived sill intrusion. Our results show that inelastic syn-emplacement deformation structures, such as the MCSZ, are very important in the accommodation of magma in the subsurface. Such small structures are unlikely to be imaged by seismic-reflection surveys, highlighting the importance of detailed field studies in our understanding of intrusion geometry and emplacement mechanisms.
机译：在特殊的曝光范围内，上层地壳入侵和他们的直接壁岩通常保持施加，岩浆流动途径和与入侵过程相关的菌株的直接证据。这种优异的曝光是由古初的少年溪流入侵 - 与登山山侵入式复杂，亨利山脉，犹他州有关的小型卫星体。估计〜3公里的估计深度侵入桑德砂岩地层中中间普发基酶-Hortblende卟啉岩浆。南部的入侵是通过新发现的少年溪剪切区（MCSZ）覆盖物：在与上覆砂岩乡村岩石接触时形成的脱象，顶到-WNW脱离。从观察结果和暴露的入侵几何形状的观察结果，建议南部少女溪流入侵包括西方衍生的倾斜的门槛板。宿主岩石砂岩在MCSZ下方的这些侵入式主体之间夹在（〜e-W收缩）。提出，MCSZ是一种同步型岩浆驱动的容纳结构，具有岩浆流动方向的剪切感，这在容纳西方衍生的门槛侵入方面发挥着关键作用。我们的结果表明，在地下岩浆的住宿中，诸如MCSZ的非弹性同步施加变形结构非常重要。这种小结构不太可能通过地震反射调查进行成像，突出了详细现场研究在我们对入侵几何和施加机制的理解中的重要性。

著录项

相似文献

  • 外文文献
  • 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