SEAFLOOR SPREADING AND TECTONICS AT THE CHARLIE GIBBS TRANSFORM SYSTEM (52-53ºN, MID ATLANTIC RIDGE): PRELIMINARY RESULTS FROM R/V A. N. STRAKHOV EXPEDITION S50

IF 1.2 4区地球科学 Q2 GEOLOGY

Ofioliti Pub Date : 2021-01-29 DOI:10.4454/OFIOLITI.V46I1.539

S. Skolotnev, A. Sanfilippo, A. Peyve, Y. Nestola, S. Sokolov, L. Petracchini, K. Dobrolyubova, V. Basch, Alexei N. Pertsev, C. Ferrando, A. Ivanenko, C. Sani, A. Razumovskiy, F. Muccini, A. Bich, C. Palmiotto, Y. V. Brusilovsky, E. Bonatti, K. N. Sholukhov, M. Cuffaro, I. Veklich, V. N. Dobrolyubov, M. Ligi

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引用次数: 4

Abstract

The Charlie Gibbs offsetting by ~ 340 km the Mid Atlantic Ridge (MAR) axis at 52°-53° N is one of the main transform systems of the North Atlantic. Located between long mid-ocean ridge segments influenced from the south by the Azores and from the north by the Iceland mantle plumes, this transform system has been active since the early phases of North Atlantic rifting. Object of several surveys in the ’70 and ’80, Charlie Gibbs received great attention for its unique structure characterized by two long-lived right-lateral transform faults linked by a short ~ 40 km-long intra-transform spreading centre (ITR) with parallel fracture zone valleys extending continuously towards the continental margins. In October 2020 expedition S50 of the R/V A.N. Strakhov surveyed an area of 54,552 km2 covering the entire Charlie Gibbs transform system and the adjacent MAR spreading segments. We collected new bathymetric, magnetic and high-resolution single channel seismic data, along with basaltic, gabbroic and mantle rocks from 21 dredges. This work contains preliminary data from cruise S50 and discusses the large-scale architecture of this unique, long-lived transform system.

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CHARLIE-GIBBS转换系统（52-53ºN，大西洋中脊）的海底扩张和构造：来自R/V.N.STRAKHOV探险S50的初步结果

查理·吉布斯在52°-53°N处偏离大西洋中脊（MAR）轴约340公里，是北大西洋的主要变换系统之一。该转换系统位于受亚速尔群岛南部和冰岛地幔羽流影响的大洋中脊长段之间，自北大西洋裂谷作用的早期阶段以来一直活跃。在70年代和80年代的几次调查中，Charlie Gibbs因其独特的结构而受到极大关注，其特征是两条长期存在的右侧转换断层，由一个约40km长的转换内扩展中心（ITR）连接，平行的断裂带山谷不断向大陆边缘延伸。2020年10月，R/V A.N.Strakhov的S50探险队调查了54552平方公里的区域，覆盖了整个Charlie Gibbs变换系统和相邻的MAR扩展段。我们从21艘挖泥船上收集了新的测深、磁性和高分辨率单通道地震数据，以及玄武岩、辉长岩和地幔。这项工作包含了巡航S50的初步数据，并讨论了这个独特的、长寿命的转换系统的大规模架构。

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来源期刊

Ofioliti 地学-地质学

CiteScore

2.40

自引率

7.70%

发文量

期刊介绍： Since 1976, Ofioliti provides an international forum for original contributions and reviews in the field of the geodynamics, petrology, geochemistry, biostratigraphy, stratigraphy, tectonics and paleogeography applied to ophiolitic terrains and modern oceanic lithosphere, including their sedimentary cover. Studies of topics such as geodynamics of the mantle, the evolution of orogens including ophiolites and paleoceanography are also welcome