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Comparative Analysis of Aptian–Albian Rocks of the Kema and Kiselevka–Manoma Terranes: Geochemistry, Geochronology, and Paleomagnetism
Russian Journal of Pacific Geology ( IF 0.9 ) Pub Date : 2019-06-17 , DOI: 10.1134/s1819714019030023
M. V. Arkhipov , I. P. Voinova , A. V. Kudymov , A. Yu. Peskov , S. Otoh , M. Nagata , V. V. Golozubov , A. N. Didenko

Abstract

The results of comprehensive (geological, geochemical, geochronological, and petro- and paleomagnetic) study of the Aptian–Albian rocks of the Kema Terrane and the northeastern Udyl segment of the Kiselevka–Manoma Terrane are presented. The obtained results suggest that the studied volcanogenic–terrigenous complexes of rocks formed in a suprasubduction zone at about the same time (early Albian, 110 Ma ago) at close latitudes but in different island arcs unequally distant from the continent: the complexes of the Kema Terrane at a latitude of 36° ± 6° N in the island arc close to the continent as evidenced by the petro–geochemical characteristics of the volcanites and the presence of ancient zircons in the sediments; and the rocks of the Udyl segment of the Kiselevka–Manoma Terrane at a latitude of 33° ± 5° N in an intraoceanic island arc separated from the volcanic arc of the Kema terrane by an interarc basin, which was wide and deep enough to avoid the influence of the continental source areas in the sediment accumulation zone of the Kiselevka–Manoma Terrane. Based on the conclusions, the geodynamic reconstruction is developed for the formation and history of motions of the studied rock complexes during the oceanic plate movement, their displacement along the transform margin, as well as post-accretionary movements at various distances to the current position with the following coordinates: Udyl 52° N, 140° E; Kema 45°–46° N, 136°–137° E.


中文翻译:

Kema和Kiselevka-Manom​​a地块的Aptian-Albian岩石比较分析:地球化学,年代学和古磁性

摘要

提出了对Kema Terrane的Aptian-Albian岩石和Kiselevka-Manom​​a Terrane的东北Udyl段的综合(地质,地球化学,地质年代学以及岩石和古磁性)研究的结果。所得结果表明,研究的俯冲带上形成的火山-陆源复合物大约在同一时间(早期Albian,110 Ma以前)在接近纬度但在离大陆不等距离的不同岛弧中形成:Kema复合物岛上弧度为36°±6°N的地形靠近大陆,由火山岩的岩石地球化学特征和沉积物中存在古代锆石所证明;在一个内陆岛屿弧中,北纬33°±5°N的基瑟列夫卡–马诺玛地貌的Udyl段的岩石与弧间盆地分隔开,与弧间盆地相距甚远。 Kiselevka-Manom​​a Terrane沉积物堆积区中大陆源区的影响。基于这些结论,开发了地球动力学重建方法,用于研究的岩石复合物在大洋板块运动期间的形成和运动历史,沿转换边缘的位移以及到当前位置不同距离的增生后运动。以下坐标:Udyl 52°N,140°E;Kema 45°–46°N,136°–137°E。它的宽度和深度足以避免在基瑟列夫卡-马诺玛地带的沉积物堆积区中受到大陆源区的影响。基于这些结论,开发了地球动力学重建方法,用于研究的岩石复合物在大洋板块运动期间的形成和运动历史,沿转换边缘的位移以及到当前位置不同距离的增生后运动。以下坐标:Udyl 52°N,140°E;Kema 45°–46°N,136°–137°E。它的宽度和深度足以避免在基瑟列夫卡-马诺玛地带的沉积物堆积区中受到大陆源区的影响。基于这些结论,开发了地球动力学重建方法,用于研究的岩石复合物在大洋板块运动期间的形成和运动历史,沿转换边缘的位移以及到当前位置不同距离的增生后运动。以下坐标:Udyl 52°N,140°E;Kema 45°–46°N,136°–137°E。以及到当前位置的不同距离后的增减运动,坐标如下:Udyl 52°N,140°E; Kema 45°–46°N,136°–137°E。以及到当前位置的不同距离后的增减运动,坐标如下:Udyl 52°N,140°E; Kema 45°–46°N,136°–137°E。
更新日期:2019-06-17
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