The Pre-Quaternary Evolution of the Eurasia Basin: The Results of Interpretation of Seismic Profile ARC1407A

IF 1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
A. V. Zayonchek, S. Yu. Sokolov, A. V. Soloviev
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Abstract

This paper presents the results of a study of the pre-Quaternary tectonics and stratigraphy of the Eurasia Basin (EB) according to the interpretation of the ARC1407A seismic profile and calculations of the theoretical positions of linear magnetic anomalies. The sedimentary sequences are recognized in seismic profiles and their stratigraphic position is similar to that of sedimentary sequences in the western parts of the Nansen and Amundsen basins. The age indexation of sedimentary sequences corresponds to the ACEX drilling results and the main evolution stages of the EB. No previously recognized reference horizon with the age of ~34 Ma, which is related to the termination of spreading in the western part of North Atlantic and amalgamation of the Greenland and North American plates, is recognized, as is supported by our studies in the western parts of the EB. In the western part of the Nansen Basin we identified a reference horizon with the age of 38 Ma for the first time, which was previously traced in the western part of the Amundsen Basin, whose formation is related to the evolution stage of the Eurekan Orogen. A reference horizon with the age of ~26 Ma, which has been traced in the western part of the Amundsen Basin before, is also distinguished in the western part of the Nansen Basin within ARC1407A. This geological boundary is related to the beginning of unstable spreading in the western segment of the EB between the Yermak Plateau and Morris Jessup Rise (Plateau). The end of a long stratigraphic hiatus between 44.4 and 18.2 Ma in the section of ACEX boreholes is clearly correlated with the formation of a sedimentary sequence of ~19.6‒18.3 Ma, which is the age of the beginning of the formation of a deep-water gateway between the North Atlantic and Eurasian sedimentary basins. This event coincides with the main reconstruction stage of movements of the Eurasia and North America plates, which led to a change in the direction of migration of momentary opening poles from the NNW to SSE. It is suggested that the thick sedimentary sequences in the Nansen Basin and the rift valley of the Gakkel Ridge that are observed in seismic section ARC1407A include Late Pliocene–Quaternary (<2.7 Ma) glaciomarine rocks, which compose a significant volume of sediments in the eastern part of the EB and the Gakkel Ridge.

Abstract Image

欧亚大陆盆地的前第四纪演化:ARC1407A 地震剖面的解释结果
摘要 本文介绍了根据 ARC1407A 地震剖面解释和线性磁异常理论位置计算对欧亚盆地(EB)前第四纪构造和地层研究的结果。地震剖面识别了沉积序列,其地层位置与南森盆地和阿蒙森盆地西部的沉积序列相似。沉积序列的年龄指数与 ACEX 钻井结果和 EB 的主要演化阶段相符。我们在 EB 西部地区的研究证实了这一点,目前尚未发现与北大西洋西部扩张终止以及格陵兰板块和北美板块合并有关的年龄为约 34 Ma 的参考层。在南森盆地西部,我们首次发现了一个年龄为 38 Ma 的参照层,此前我们曾在阿蒙森盆地西部追踪到这一参照层,其形成与厄勒干造山运动的演化阶段有关。在 ARC1407A 内的南森盆地西部也发现了一个年龄约为 26 Ma 的参照层,该参照层曾在阿蒙森盆地西部被追踪到。这一地质界线与叶尔马克高原和莫里斯-杰瑟普隆起(高原)之间的 EB 西段不稳定扩张的开始有关。在 ACEX 钻孔剖面中,44.4-18.2Ma 之间漫长地层间断的结束与 ~19.6-18.3 Ma 沉积序列的形成明显相关,而这正是北大西洋与欧亚沉积盆地之间深水门户开始形成的年代。这一事件与欧亚板块和北美板块运动的主要重建阶段相吻合,这导致了瞬时开口极的迁移方向从西北偏北转向东南偏东。ARC1407A 地震剖面中观察到的南森盆地和加克尔海脊裂谷的厚沉积层序包括晚更新世-第四纪(2.7Ma)冰川岩,这些冰川岩构成了 EB 东部和加克尔海脊的大量沉积物。
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来源期刊
Geotectonics
Geotectonics 地学-地球化学与地球物理
CiteScore
1.90
自引率
9.10%
发文量
28
审稿时长
3 months
期刊介绍: Geotectonics publishes articles on general and regional tectonics, structural geology, geodynamics, and experimental tectonics and considers the relation of tectonics to the deep structure of the earth, magmatism, metamorphism, and mineral resources.
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