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首页> 外文期刊>Journal of geodynamics >Genetic relationship of rift-stage crustal structure, terrane accretion, and foreland tectonics along the southern Appalachian-Ouachita orogen
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Genetic relationship of rift-stage crustal structure, terrane accretion, and foreland tectonics along the southern Appalachian-Ouachita orogen

机译：阿巴拉契亚-沃希塔造山带南部裂谷期地壳结构，地层增生和前陆构造的成因关系

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摘要

Abrupt along-strike variations in tectonostratigraphic composition, internal structural style, and detachment level in the southern Appalachian and Ouachita foreland thrust belts are defined at a large-scale bend in strike and a truncation of Ouachita structures by the frontal Appalachian thrust fault. The along-strike variations correspond to differences in the pre-orogenic rifted Laurentian margin, in the history and nature of terrane accretion, and in the response of the foreland to these differences. Within the Ouachita embayment of the Laurentian margin, diachronous arc-continent collision migrated northwestward along a rift-stage transform margin from the Black Warrior foreland basin on the southeast in Late Mississippian time to a short-wavelength, high-amplitude foreland basin (Arkoma basin) on the northwest in front of the Ouachita thrust-belt salient in Early-Middle Pennsylvanian time. Off-shelf, deep-water strata of both passive-margin and synorogenic facies comprise an accretionary prism and subduction complex, and the Ouachita allochthon consists of mud-dominated thrust sheets that are internally dis-harmonic and folded. The allochthon of off-shelf strata was thrust over the passive-margin carbonate shelf, which remains in the Ouachita footwall. Along the southeast side of the Alabama promontory of the Laurentian margin, passive-margin shelf carbonates are imbricated in the Appalachian thrust belt, which is characterized by internally coherent thrust sheets and high-amplitude frontal ramps. The palinspastic extent of shelf-carbonate rocks corresponds to the extent of structurally shallow basement rocks on the upper-plate rift-stage margin of the Alabama promontory of Laurentian crust. Terranes accreted to the Laurentian margin during the Taconic and Acadian orogenies were driven over the shallow basement by continent-continent collision of Laurentia with Africa (Gondwana). Emplacement of the thrust-translated terranes tectonically stripped and replaced the shelf carbonate. The frontal thrust fault of the Appalachian thrust belt truncates the southeastern end of the slightly older frontal Ouachita thrust belt, as well as the southeastern part of the greater Black Warrior basin in the Ouachita foreland. Shallow basement beneath the Appalachian thrust belt extends cratonward beneath the low-amplitude Appalachian foreland basin.
机译：南部阿巴拉契亚前陆带和瓦希塔前陆冲断带构造地层组成，内部构造样式和脱离水平的突然沿袭变化是由前额阿巴拉契亚冲断断层的走向和大范围弯折形成。沿罢工的变化对应于造山前裂谷的Laurentian边缘，地层增生的历史和性质以及前陆对这些差异的响应。在Laurentian边缘的Ouachita凹陷内，逆时针弧-大陆碰撞沿裂谷转换边缘向西北移动，从密西西比后期晚期的东南部的Black Warrior前陆盆地向短波高振幅前陆盆地（Arkoma盆地）迁移），位于宾夕法尼亚州中早期的Ouachita冲断带凸出带的西北方。被动边缘和协同成因相的现成深水地层由增生棱镜和俯冲复合体组成，而瓦希托异形体由泥浆为主的逆冲片组成，内部不谐和折叠。现成地层的异位层被推过保留在Ouachita后壁的被动边缘碳酸盐岩架。沿着洛朗山脉边缘的阿拉巴马州海角东南侧，阿巴拉契亚逆冲带中嵌有被动边缘的碳酸盐碳酸盐岩，其特征是内部连贯的逆冲片层和高振幅的前斜坡。陆架碳酸盐岩的火山作用范围对应于洛朗地壳阿拉巴马海角上板裂陷边缘上结构较浅的基底岩石的范围。在Taconic和Acadian造山运动期间，人族在Laurentian边缘增生，原因是Laurentia与非洲（冈瓦纳）的大陆-大陆碰撞将其带入了浅层地下室。推力平移的地体的构造发生了剥离，并取代了碳酸盐岩。阿巴拉契亚冲断带的前冲断层截断了稍稍较早的额瓦希托冲断带的东南端，以及瓦希托前陆大黑武士盆地的东南部。阿巴拉契亚前冲带之下的浅层基底在低振幅的阿巴拉契亚前陆盆地之下向克拉通方向延伸。

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