Rechnitz window group represents a Cordilleran-style metamorphic core complex, which is almost entirely located within nearly contemporaneous Neogene sediments at the transition zone between the Eastern Alps and the Neogene Pannonian basin. Two tectonic units are distinguished within the Rechnitz metamorphic core complex (RMCC): (1) a lower unit mainly composed of Mesozoic metasediments, and (2) an upper unit mainly composed of ophiolite remnants. Both units are metamorphosed within greenschist facies conditions during earliest Miocene followed by exhumation and cooling. The internal structure of the RMCC is characterized by the following succession of structure-forming events: (1) blueschist relics of Paleocene/Eocene age formed as a result of subduction (D1), (2) ductile nappe stacking (D2) of an ophiolite nappe over a distant passive margin succession (ca. E–W to WNW–ESE oriented stretching lineation), (3) greenschist facies-grade metamorphism annealing dominant in the lower unit, and (4) ductile low-angle normal faulting (D3) (with mainly NE–SW oriented stretching lineation), and (5) ca. E to NE-vergent folding (D4). The microfabrics are related to mostly ductile nappe stacking to ductile low-angle normal faulting. Paleopiezometry in conjunction with P–T estimates yield high strain rates of 10− 11 to 10− 13 s− 1, depending on the temperature (400–350 °C) and choice of piezometer and flow law calibration. Progressive microstructures and texture analysis indicate an overprint of the high-temperature fabrics (D2) by the low-temperature deformation (D3). Phengitic mica from the Paleocene/Eocene high-pressure metamorphism remained stable during D2 ductile deformation as well as preserved within late stages of final sub-greenschist facies shearing. Chlorite geothermometry yields two temperature groups, 376–328 °C, and 306–132 °C. Chlorite is seemingly accessible to late-stage resetting. The RMCC underwent an earlier large-scale coaxial deformation accommodated by a late non-coaxial shear with ductile low-angle normal faulting, resulting in subvertical thinning in the extensional deformation regime. The RMCC was rapidly exhumed during ca. 23–18 Ma.

中文翻译：

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东阿尔卑斯山脉 Cordilleran 型 Rechnitz 变质核心复合体的结构、微织物和纹理

Rechnitz 窗群代表了一个科迪勒拉式变质岩核杂岩，它几乎完全位于东阿尔卑斯山和新近纪潘诺尼亚盆地之间的过渡带上几乎同时代的新近纪沉积物中。在 Rechnitz 变质核杂岩体 (RMCC) 中区分出两个构造单元：(1) 主要由中生代变沉积物组成的下部单元，和 (2) 主要由蛇绿岩残余物组成的上部单元。在最早的中新世期间，这两个单元都在绿片岩相条件下变质，然后是挖掘和冷却。RMCC的内部结构具有以下一系列结构形成事件的特点：（1）由于俯冲作用形成的古新世/始新世蓝片岩遗迹（D1），(2) 蛇绿岩推覆在远处被动边缘序列上的延展性推覆堆积 (D2)（大约 E-W 到 WNW-ESE 定向拉伸线理），（3）绿片岩相级变质作用退火在下部单元中占主导地位，和(4) 延展性低角度正断层 (D3)（主要是 NE-SW 取向的拉伸线理），和 (5) ca。E 到 NE 会聚折叠 (D4)。超细纤维主要与延性推覆堆积和延展性低角度正断层有关。根据温度 (400–350 °C) 以及压力计和流动定律校准的选择，古压力计结合 P-T 估计产生 10- 11 到 10- 13 s- 1 的高应变率。渐进的微观结构和质地分析表明高温织物 (D2) 的叠印是由低温变形 (D3) 引起的。来自古新世/始新世高压变质作用的表皮云母在 D2 韧性变形期间保持稳定，并在最终亚绿片岩相剪切的后期阶段得以保存。绿泥石地球测温法产生两个温度组，376–328 °C 和 306–132 °C。绿泥石似乎可用于后期重置。RMCC 经历了早期的大规模同轴变形，由晚期非同轴剪切和延展性低角度正断层引起，导致拉伸变形范围内的近垂直变薄。RMCC 在大约期间被迅速挖掘出来。23-18 马。绿泥石似乎可用于后期重置。RMCC 经历了早期的大规模同轴变形，由晚期非同轴剪切和延展性低角度正断层引起，导致拉伸变形范围内的近垂直变薄。RMCC 在大约期间被迅速挖掘出来。23-18 马。绿泥石似乎可用于后期重置。RMCC 经历了早期的大规模同轴变形，由晚期非同轴剪切和延展性低角度正断层引起，导致拉伸变形范围内的近垂直变薄。RMCC 在大约期间被迅速挖掘出来。23-18 马。