美国堪萨斯州中部大陆裂谷系统的岩相分析和沉积模型

IF 1.9 3区 地球科学 Q1 GEOLOGY
Iffat Azmi, Karin Goldberg
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引用次数: 0

摘要

北美洲的中大陆裂谷系统是最古老的大陆裂谷之一,但裂谷在大陆解体之前就已停止。中洲断裂系统的南段位于美国堪萨斯州,地层演替和断裂演化在很大程度上不为人知。本研究分析了中洲大裂谷系统这一部分的裂谷盆地充填情况,提出了一个沉积模型。在华盛顿县德士古 Noel Poersch#1 井中钻取的不连续岩心描述了前寒武纪裂谷演替。确定了十六种岩相,并将其分为四个不同的岩相组合(河流岩相、风化岩相、湖泊岩相和冲积扇岩相)。总体而言,所研究的演替主要由冲积和风积环境中堆积的大陆沉积物组成,间或有湖积系统的发育。针对现有岩芯区间提出的沉积模型表明,裂谷盆地内存在过度充填和充填不足的循环模式。在同步裂谷阶段的演化过程中,容纳-供给比的这些变化受构造运动的控制,也可能受气候的调节。这项研究加深了我们对整个中部大陆裂谷系统变化的了解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Facies analysis and depositional model of the Midcontinent Rift System in Kansas, USA

Facies analysis and depositional model of the Midcontinent Rift System in Kansas, USA

The Midcontinent Rift System of North America is one of the oldest continental rifts but rifting ceased before continental breakup. The southern segment of the Midcontinent Rift System lies in Kansas, USA, where the stratigraphic succession and rift evolution are largely unknown. This study analysed the rift basin infill in this part of the Midcontinent Rift System to propose a depositional model. The Precambrian rift succession was described in discontinuous cores drilled in the Texaco Noel Poersch#1 well in Washington County. Sixteen lithofacies were identified and grouped into four different facies associations (fluvial, aeolian, lacustrine and alluvial fan). Overall, the studied succession comprises continental deposits accumulated dominantly in alluvial and aeolian settings, with the intermittent development of lacustrine systems. The proposed depositional models for the available core intervals indicate cyclic patterns of overfilled and underfilled phases within the rift basin. These changes in the accommodation-to-supply ratio were controlled by tectonism and probably modulated by climate during evolution in the syn-rift phase. This study advances our understanding of variations across the Midcontinent Rift System.

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来源期刊
CiteScore
4.10
自引率
16.70%
发文量
42
审稿时长
16 weeks
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