Magnitude, timing, and rate of slip along the Atacama fault system, northern Chile: implications for Early Cretaceous slip partitioning and plate convergence
Magnitude, timing, and rate of slip along the Atacama fault system, northern Chile: implications for Early Cretaceous slip partitioning and plate convergence
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智利北部阿塔卡马断层系统沿线的滑动量、时间和速率：对早白垩世滑动分区和板块汇聚的影响
DOI：
10.1144/jgs2020-142
复制
发表时间：
2021
影响因子：
2.7
通讯作者：
Stockli, D.F.
中科院分区：
文献类型：
--
作者：
Seymour, N.M.;Singleton, J.S.;Gomila, R.;Mavor, S.P.;Heuser, G.;Arancibia, G.;Williams, S.;Stockli, D.F.
阿塔卡马断层系统（Atacama fault system， AFS）是一种地壳规模的左旋构造，在中生代海岸科迪勒拉弧中容纳了斜辐合，由于缺乏刺穿点，沿阿塔卡马断层系统的位移估计差异很大。我们绘制了El Salado段北部约70 km的岩体和糜棱岩变形分布图，并利用U-Pb年代学方法建立了AFS的滑动史。沿东支，与c. 134-132 Ma Cerro del Pingo杂岩相关的糜棱岩组构与c. 120-119 Ma同动斑岩相关的糜棱岩组构间隔34-38 km，与c. 120-119 Ma同动斑岩相关的糜棱岩组构间隔20.5-26 km。我们解释说，在整个西部分支中，白垩质侵入体相隔约16-20公里，因此在El Salado段的总滑移幅度为约54±6公里。运动学指标一致地记录了左旋剪切，锆石(U-Th)/He数据表明倾滑运动不显著。位移发生在c. 133-110 Ma之间，滑动速率为c. 2.1-2.6 km mir - 1。与现代弧内走滑断层相比，这一滑动率较低，这表明：(1)大部分横向滑动是沿着板块界面进行的，或分布在弧前；(2)板块收敛速率/倾角明显低于之前的模型。补充资料：完整的U-Pb，(U-Th)/He，岩石学和结构数据与位置可在https://doi上获得。org/10.6084/m9。figshare。c。5262177
Displacement estimates along the Atacama fault system (AFS), a crustal-scale sinistral structure that accommodated oblique convergence in the Mesozoic Coastal Cordillera arc, vary widely due to a lack of piercing points. We map the distribution of plutons and mylonitic deformation along the northern c. 70 km of the El Salado segment and use U–Pb geochronology to establish the slip history of the AFS. Along the eastern branch, mylonitic fabrics associated with the synkinematic c. 134–132 Ma Cerro del Pingo Complex are separated by 34–38 km, and mylonites associated with a synkinematic c. 120–119 Ma tonalite are separated by 20.5–26 km. We interpret leucocratic intrusions to be separated across the western branch by c. 16–20 km, giving a total slip magnitude of c. 54±6 km across the El Salado segment. Kinematic indicators consistently record sinistral shear, and zircon (U–Th)/He data suggest dip-slip motion was insignificant. Displacement occurred between c. 133–110 Ma at a slip rate of c. 2.1–2.6 km Myr–1. This slip rate is low compared to modern intra-arc strike-slip faults, suggesting (1) the majority of lateral slip was accommodated along the slab interface or distributed through the forearc or (2) plate convergence rates/obliquity were significantly lower than previously modeled.Supplementary material: Full U-Pb,(U-Th)/He, petrographic, and structural data with locations is available at https://doi. org/10.6084/m9. figshare. c. 5262177
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