加拿大育空地区Wernecke山陆架斜坡样带埃迪卡拉纪Gametrail组岩性、化学和层序综合地层学

IF 1.9 3区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
James F. Busch, Thomas H. Boag, Erik A. Sperling, Alan D. Rooney, Xiahong Feng, David P. Moynihan, Justin V. Strauss
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引用次数: 0

摘要

加拿大西北部埃迪卡拉纪Gametrail组记录了一个复杂的碳酸盐斜坡系统的演化,以响应相对海平面的波动和区域构造沉降,以及与Shuram碳同位素偏移(CIE)相关的异常全球变化。在这里,我们利用加拿大育空地区Wernecke山脉的Gametrail组的大量露头,构建了一个横跨Shuram CIE的大陆架斜坡样带。研究人员将Gametrail组的12个地层剖面与地质测绘和一套地球化学分析相结合,为这些地层建立了一个完整的岩性、化学和层序地层模型。在更近的Corn/Goz Creek地区,Gametrail组代表了以风暴为主的内到外斜坡沉积环境,而Nadaleen河地区的斜坡沉积环境则以半深海沉积、浊积岩和泥石流为主。舒拉姆斜坡灰岩的CIE值在经历沉积缓冲成岩作用的斜坡灰岩中最大,而在经历流体缓冲成岩作用的内外斜坡白云岩中CIE值明显较小。我们的区域制图在中新生代科迪勒拉造山运动中通过走滑运动在陆架斜坡样带内发现了一个明显的构造板块,移动了约30公里。该搬运构造块的一个位置包含一个碳同位素值极负的叠层石礁复合体,其碳同位素值低至~ -30‰,而另一个位置包含一个过厚的鲕滩复合体,其不保留与Shuram事件相关的特征负CIE。沿着Wernecke山脉和全球其他地方的大陆架斜坡样带,这些与Shuram CIE通常表达的偏差,为局部构造、地层和/或地球化学复杂性如何导致全球公认的CIE异常大或完全不存在的表达提供了有用的例子。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Integrated Litho-, Chemo- and Sequence Stratigraphy of the Ediacaran Gametrail Formation Across a Shelf-Slope Transect in the Wernecke Mountains, Yukon, Canada
The Ediacaran Gametrail Formation of northwestern Canada chronicles the evolution of a complex carbonate ramp system in response to fluctuations in relative sea level and regional tectonic subsidence alongside exceptional global change associated with the Shuram carbon isotope excursion (CIE). Here, we use extensive outcrop exposures of the Gametrail Formation in the Wernecke Mountains of Yukon, Canada, to construct a shelf-slope transect across the Shuram CIE. Twelve stratigraphic sections of the Gametrail Formation are combined with geological mapping and a suite of geochemical analyses to develop an integrated litho-, chemo-, and sequence stratigraphic model for these strata. In the more proximal Corn/Goz Creek region, the Gametrail Formation represents a storm-dominated inner to outer ramp depositional setting, while slope depositional environments in the Nadaleen River region are dominated by hemipelagic sedimentation, turbidites, and debris flows. The magnitude of the Shuram CIE is largest in slope limestones which underwent sediment-buffered diagenesis, while the CIE is notably smaller in the inner-outer ramp dolostones which experienced fluid-buffered diagenesis. Our regional mapping identified a distinct structural panel within the shelf-slope transect that was transported ~30 km via strike-slip motion during the Mesozoic–Cenozoic Cordilleran orogeny. One location in this transported structural block contains a stromatolite reef complex with extremely negative carbon isotope values down to ~ -30‰, while the other location contains an overthickened ooid shoal complex that does not preserve the characteristic negative CIE associated with the Shuram event. These deviations from the usual expression of the Shuram CIE along the shelf-slope transect in the Wernecke Mountains, and elsewhere globally, provide useful examples for how local tectonic, stratigraphic, and/or geochemical complexities can result in unusually large or completely absent expressions of a globally recognized CIE.
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来源期刊
American Journal of Science
American Journal of Science 地学-地球科学综合
CiteScore
5.80
自引率
3.40%
发文量
17
审稿时长
>12 weeks
期刊介绍: The American Journal of Science (AJS), founded in 1818 by Benjamin Silliman, is the oldest scientific journal in the United States that has been published continuously. The Journal is devoted to geology and related sciences and publishes articles from around the world presenting results of major research from all earth sciences. Readers are primarily earth scientists in academia and government institutions.
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