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首页> 外文期刊>Journal of geodynamics >Tectonics of the New Siberian Islands archipelago: Structural styles and low-temperature thermochronology
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Tectonics of the New Siberian Islands archipelago: Structural styles and low-temperature thermochronology

机译：新西伯利亚群岛群岛的构造：构造样式和低温热年代学

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Tectonic evolution of the New Siberian Islands (NSI) has been revealed based on detailed structural investigations and a (U-Th)/He low-temperature thermochronologic study of detrital zircons (ZHe) and apatite (AHe). Our study supports models claiming a non Siberian affinity of the NSI and furthermore suggests that the study area formed a part of the Arctic-Alaska-Chukotka microcontinent. Seven stages of deformation have been revealed. The earliest stage (Stage 1) involved contractional deformation with transport directions towards the W to WSW and occurred during the Late Cambrian across the De Long Islands. The next episode of deformation (Stage 2) has been revealed based on the low-temperature thermochronology (ca. 378-414 Ma, ZHe) and structural data. A pre-Frasnian angular unconformity formed as a result of Stage 2 deformation on Kotel'nyi Island, which involved contractional deformation with S-to SW transport directions (modern coordinates) in the mid-Paleozoic. In the latest Early Cretaceous Late Cretaceous, three deformation stages were initiated by collision between the western part of the Arctic-Alaska-Chukotka microcontinent and Siberia, forming the South Anyui suture zone and overlapping orogenic belt. Stage 3 was characterized by the formation of major NW trending folds, thrusts, and both transfer dextral and sinistral strike-slip faults with a reverse component. During Stage 4, the Arctic Alaska-Chukotka microcontinent moved westward. On Bolshoy Lyakhovsky Island, sinistral strike-slip faults were formed, whilst E-W compression took place across the Anjou islands. In Stage 5, the Arctic Alaska-Chukotka microcontinent shifted southward, forming a series of N-S-trending dextral strike-slip faults. The ZHe and AHe ages (ca. 93-125 Ma) suggest that these deformation events were associated with significant uplift in the western part of the NSI (Kotel'nyi and Bel'kovsky islands), whilst the eastern part (De Long Islands) was marginally affected by these events without significant uplift. The Cenozoic extension event (Stage 6) corresponds to the opening of the Eurasian Basin. This stage is manifested by the cooling episode (ca. 53 Ma, Early Eocene, AHe) established in the eastern part of the NSI (Jeannette Island). The origins of the late Cenozoic contractional deformations described from the Cenozoic deposits of the Anjou Islands (Stage 7) are unclear, but were possibly caused by movements along the Eurasian and North-American lithospheric plates.
机译：基于详细的结构研究和碎屑锆石（ZHe）和磷灰石（AHe）的（U-Th）/ He低温热年代学研究，已经揭示了新西伯利亚群岛（NSI）的构造演化。我们的研究支持声称NSI具有非西伯利亚亲和力的模型，并且进一步表明该研究区域构成了北极-阿拉斯加-楚科奇州微大陆的一部分。揭示了变形的七个阶段。最早的阶段（第1阶段）涉及收缩变形，其向W向WSW的输送方向是发生在寒武纪晚期穿越De Long Islands的时期。根据低温热年表（大约378-414 Ma，ZHe）和结构数据，揭示了下一阶段的变形（阶段2）。在Kotel'nyi岛上发生了第2阶段变形，形成了前弗拉西尼亚角不整合，该变形涉及古生代中期S到SW传输方向（现代坐标）的收缩变形。在最新的白垩纪晚期至白垩纪晚期，北极-阿拉斯加-楚科奇火山微大陆的西部与西伯利亚之间的碰撞引发了三个变形阶段，形成了南安义缝合带和重叠的造山带。第三阶段的特征是形成了主要的西北走向褶皱，逆冲，并转移了右旋和左旋走滑断层，并具有反向分量。在第4阶段，北极阿拉斯加-楚科奇微大陆向西移动。在Bolshoy Lyakhovsky岛上，形成了左旋走滑断层，而在Anjou岛上进行了E-W压缩。在第5阶段，北极阿拉斯加-楚科奇微大陆向南偏移，形成了一系列N-S向右旋走滑断裂。 ZHe和AHe年龄（约93-125 Ma）表明，这些变形事件与NSI西部（Kotel'nyi和Bel'kovsky岛）的明显隆升有关，而东部（De Long Islands）受这些事件的影响很小，而没有明显的提升。新生代伸展事件（第6阶段）对应于欧亚盆地的开放。在NSI（让内特岛）东部建立的降温情节（约53 Ma，早期始新世，AHe）表明了这一阶段。从安茹群岛（第7阶段）新生代沉积物中描述的晚新生代收缩形变的起源尚不清楚，但可能是由沿欧亚大陆和北美岩石圈板块的运动引起的。

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