Rare bedrock exposures of the eastern Denali fault zone in southwestern Yukon allow for the measurement, sampling, and analyses of brittle regime fault slip data and deformation mechanisms to explore relations to far field, oblique plate motions. Host rock lithologies and associated slip surfaces show episodic damage zone-related deformation and calcite ± hematite ± chlorite related hydrothermal fluid flow. This regional scale network of asymmetric fault damage is spatially and kinematically linked to a discrete and narrow fault core. Fault network observations, orientations, slip data, and strain inversions document a slip partitioned strike-slip fault system with locally and mutually overprinting strike-, oblique-, and dip-slip components. Microstructural analyses reveal crystal plastic and co-seismic brittle deformation mechanisms active in a narrow range of upper crustal temperature, pressure, fluid, and chemical conditions. The net damage related slip is not exclusively formed by a single kinematic system, but rather a fully partitioned, time integrated system likely operative for much of the fault's brittle regime evolution temporally constrained by previously published thermochronometric data. Although the fault slip data was collected from outcrop-scale exposures at sites tens of kilometers apart, results show remarkable correlation between fault kinematics and plate motions along the ∼580 km long eastern Denali fault segment. End member, subhorizontal, northeast directed reverse and north directed dextral strike slip fault strain axes closely reflect relative plate motion interactions over at least the last 30 m.y. and act as a proxy for far-field stresses compatible with the kinematics of the damage zone network.

中文翻译：

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育空地区西南部 Denali 断层带沿线的脆性滑移划分损伤和变形机制


育空地区西南部东部 Denali 断层带的稀有基岩暴露允许测量、采样和分析脆性断层滑移数据和变形机制，以探索与远场斜板块运动的关系。主岩岩性和相关滑移表面显示阵发性损伤带相关变形和方解石±赤铁矿±绿泥石相关的热液流体流动。这种区域尺度的不对称断层损伤网络在空间和运动学上与离散而狭窄的断层核心相连。断层网络观测、方向、滑移数据和应变反演记录了一个滑移分区的走滑断层系统，该系统具有局部和相互叠印的走滑分量、斜滑移和倾角滑移分量。微观结构分析揭示了在上地壳温度、压力、流体和化学条件的狭窄范围内活跃的晶体塑性和共震脆性变形机制。与净损伤相关的滑移并不完全由单个运动学系统形成，而是一个完全分区的时间积分系统，可能在断层的大部分脆性状态演变中起作用，在时间上受到先前发表的热计时数据的限制。尽管断层滑移数据是从相距数十公里的地点的露头规模暴露中收集的，但结果表明，断层运动学与沿 ∼580 公里长的东部 Denali 断层段的板块运动之间存在显着的相关性。端元、次水平、东北方向的反向和北向右旋走滑断层应变轴密切反映了至少过去 30 my 的相对板块运动相互作用，并充当与损伤区网络运动学兼容的远场应力的代理。