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首页> 外文期刊>Geological Society of America Bulletin >Syndepositinal thrust-related deformation and sedimentation in an Ancestral Rocky Mountains basin, Central Colorado trough, Colorado, USA
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Syndepositinal thrust-related deformation and sedimentation in an Ancestral Rocky Mountains basin, Central Colorado trough, Colorado, USA

机译：美国科罗拉多州中部低谷祖先洛矶山脉盆地的与沉积有关的与逆冲有关的变形和沉积

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摘要

Pennsylvanian-Permian synorogenic deposits (Minturn and Sangre de Cristo Formations) of the Central Colorado trough record an interplay of deformation and sedimentation in an Ancestral Rocky Mountains basin. The Central Colorado trough was a north-trending basinbordered by basement-involved highlands of the Uncompahgre uplift on the west and the Ancestral Front Range and Apishapa uplift on the east. Stratigraphic data show that the Central Colorado trough was an asymmetric basin in which coarse-grained sediments were deposited adjacent to the Sand Creek-Crestone thrust fault system of the Uncomphhgre uplift. These deposits pinch out eastward against the Apishapa uplift along the western margin of the basin. Lithofacies analysis shows that the Central Colorado trough was filled by fan-delta, fluvial-delta, and turbidite deposits of the Middle Pennsylvanian Minturn Formation and by alluvialfan, braided-stream, and meandering-stream deposits of the Upper Pennsylvanian-Permian Sangre de Cristo Formation.Geologic mapping has identified three syndepositional structures in the strata of the Central Colorado trough that indicate Pensylvanian-Permian shortening: (1) the Gibson Peak growth syncline in the footwall of the Crestone thrust fault, which formed by syndepositional rotation of the Crestone Conglomerate Member of the Sangre de Cristo Formation during thrust displacement; (2) the Sand Creek thrust fault, which cuts the lower part of the Crestone Conglomerate Member but is covered by younger deposits of the Crestone Conglomerate Member; and (3) an intraformational angular unconformity in the Sangre de Critsto Formation that separates folded strata from overlying less deformed strata. All three structures indicate general east-west shortening during deposition.We interpret the Central Colorado trough as a flexural basin on the basis of syndepositional thrust-related structures, basin asymmetry, and lithofacies distribution. Displacement on the east-verging Sand CreekCrestone thrust fault system appears to have controlled uplift of the central part of the Uncompahgre uplift and also subsidence in the adjacent basin. The Apishapa uplift, located along the eastern margin of the basin, is interpreted as a possible flexural forebulge related to crystal loading of thrust sheets along the western margin of the Central Colorado trough. Geologic mapping, subsurface data, and identification of syndepositional structures has also led to better understanding of post-Paleozoic deformation of Pennsylvanian-Permian strata of the Central Colorado trough and the structural evolution of the present Sangre de Cristo Mountains.
机译：科罗拉多中部槽的宾州-二叠纪共生沉积物（Minturn和Sangre de Cristo地层）记录了洛矶山祖先盆地变形和沉积的相互作用。科罗拉多中部海槽是北向的盆地，西部是与地下有关的Uncompahgre隆起高地，东部是祖先山脉和Apishapa隆起。地层数据表明，科罗拉多中部槽是一个不对称盆地，其中粗粒状沉积物沉积在Uncomphhgre隆起的Sand Creek-Crestone逆冲断层系统附近。这些沉积物沿盆地西缘向东挤压，抵御Apishapa隆升。岩相分析显示，科罗拉多中部海槽充满了宾夕法尼亚中部Minturn组的扇三角洲，河流三角洲和浊积岩沉积物，以及宾夕法尼亚州上-二叠纪Sangre de Cristo的冲积扇状，辫状河和曲折河沉积物地质制图已经确定了中部科罗拉多海槽地层中的三个同沉积结构，表明Pensylvanian-Permian缩短：（1）Crestone逆冲断层下盘的Gibson峰生长向斜线是由Crestone砾岩的同沉积旋转形成的推力位移过程中的Sangre de Cristo组成员; （2）沙溪逆冲断层，它切开了Crestone联合体成员的下部，但被Crestone联合体成员的较年轻沉积物所覆盖; （3）Sangre de Critsto地层的构造内角度不整合面，将褶皱地层与上覆变形程度较小的地层分开。这三个结构都表明沉积过程中东西向的总体缩短。我们根据与冲断相关的构造，盆地的不对称性和岩相分布将中部科罗拉多槽解释为弯曲盆地。向东延伸的Sand CreekCrestone逆冲断层系统上的位移似乎控制了Uncompahgre隆升中部的隆升，并控制了邻近盆地的沉降。位于盆地东部边缘的阿皮沙坝隆起被解释为与沿科罗拉多中部海槽西部边缘的逆冲片的晶体载荷有关的可能的弯曲前突。地质制图，地下数据和同沉积构造的识别也使人们更好地了解了中部科罗拉多谷的宾夕法尼亚-二叠纪地层的古生代形变和当前的圣克里斯托山的结构演化。

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