The concept of tectonic provenance: Case study of the gigantic Markagunt gravity slide basal layer

The concept of tectonic provenance: Case study of the gigantic Markagunt gravity slide basal layer
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构造物源概念:以巨型Markagunt重力滑坡基底层为例

DOI:
10.1111/ter.12608
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发表时间:
2022
期刊:
影响因子:
2.4
通讯作者:
Rowley, Peter D.
Rowley, Peter D.
中科院分区:
地球科学3区
文献类型:
--
作者:
Mayback, Danika F.;Braunagel, Michael J.;Malone, David H.;Griffith, W. Ashley;Holliday, McKenna E.;Rivera, Tiffany A.;Biek, Robert F.;Hacker, David B.;Rowley, Peter D.

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大型滑坡基底层的形成和演化对减少滑动摩擦阻力的过程具有重要意义。在这份报告中,我们表明,锆石年代学和构造源区可以用来调查的巨型Markagunt重力滑动的犹他州,美国的基底层。基底层和碎屑注入岩样品具有独特的构造年代相,可识别在侵位过程中被分解的岩石单元。我们的研究结果表明,从网站上的前陆地表面的基础材料是统计上难以区分的,主要是由上板岩性在滑动过程中的故障。与当地基底层相比,去顶注入岩具有不同的构造年代相,具有更丰富的下部板源锆石。这表明碎屑岩脉形成的平移历史较早,从结构上更深的部分的滑动面和成分不同的基底层之前,被平移到目前的位置。
Formation and evolution of the basal layer in large landslides has important implications for processes that reduce frictional resistance to sliding. In this report, we show that zircon geochronology and tectonic provenance can be used to investigate the basal layer of the gigantic‐scale Markagunt gravity slide of Utah, USA. Basal layer and clastic injectite samples have unique tectonic chronofacies that identify the rock units that were broken down during emplacement. Our results show that basal material from sites on the former land surface is statistically indistinguishable and formed primarily by the breakdown of upper plate lithologies during sliding. Decapitated injectites have a different tectonic chronofacies than the local basal layer, with more abundant lower plate‐derived zircons. This suggests clastic dikes formed earlier in the translation history from a structurally deeper portion of the slide surface and a compositionally different basal layer before being translated to their current position.
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