Determination of offset across the northern margin of the Wichita uplift, southwest Oklahoma
Determination of offset across the northern margin of the Wichita uplift, southwest Oklahoma
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确定俄克拉荷马州西南部威奇托隆起北缘的偏移量
DOI：
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发表时间：
1989
期刊：
影响因子：
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通讯作者：
D. McConnell
中科院分区：
文献类型：
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作者：
D. McConnell
威奇托隆起代表了原始落基山脉内的一个构造单元，一系列涉及基底的隆起和沃希托造山带前陆内的相关盆地。对比威奇托隆起演化的构造模型，通过（i）分析将隆起与相邻的阿纳达科盆地分开的前缘断层带内的一套构造，及（ii）进行厚顿集团的修复工程（晚奥陶世-泥盆纪）盆地和前缘断裂带之间的厚度趋势，以估计主隆起的偏移幅度和方向-边界断层从隆起到盆地的横截面显示出与落基山脉Laramide（晚白垩纪-第三纪）前陆相似的基底逆冲断层和褶皱。地图视图中的结构模式具有先前被解释为由隆起边界断层上的逆滑和/或左滑造成的元素。前缘断裂带和阿纳达科盆地之间的等厚线模式的Palestically恢复表明，跨越前缘断层的偏移可以解释为隆起边界断层上的斜向滑动（左逆滑动）。左滑的分量是近一个数量级，低于在一些以前的模型中提出的石炭纪构造作用的前陆的沃希托造山带。
The Wichita uplift represents a tectonic element within the Ancestral Rocky Mountains, a series of basement-involved uplifts and associated basins within the foreland of the Ouachita orogen. Contrasting tectonic models for the evolution of the Wichita uplift are evaluated by (i) analyzing the suite of structures within the Frontal fault zone, which separates the uplift from the adjoining Anadarko basin, and (ii) undertaking a palinspastic restoration of Houton Group (Late Ordovician-Devonian) thickness trends between the basin and the Frontal fault zone to estimate the magnitude and sense of offset across the principal uplift-bounding faults. Cross sections from uplift to basin show basement-involved thrusts and folds similar to those recognized within the Laramide (Late Cretaceous-Tertiary) foreland of the Rocky Mountains. Structural patterns in map view possess elements that have been previously interpreted as resulting from reverse slip and/or left slip on the uplift-bounding faults. Palinspastic restoration of isopach patterns between the Frontal fault zone and Anadarko basin indicates that offset across the frontal faults may be explained by oblique slip (left reverse slip) on the uplift bounding faults. The component of left slip is nearly an order off magnitude less than proposed in some previous models of Carboniferous tectonism within the foreland of the Ouachita orogen.