Insights from the Jan Mayen system in the Norwegian-Greenland SeauII. Architecture of a microcontinent

被引:30
作者
Peron-Pinvidic, Gwenn [1 ]
Gernigon, Laurent [1 ]
Gaina, Carmen [2 ]
Ball, Philip [3 ]
机构
[1] Geol Survey Norway, NGU, N-7491 Trondheim, Norway
[2] Univ Oslo, PGP, Oslo, Norway
[3] STATOIL, Houston, TX 77042 USA
关键词
Continental margins: divergent; Oceanic plateaus and microcontinents; Dynamics of lithosphere and mantle; Atlantic Ocean; CENTRAL EAST GREENLAND; VOLCANIC CONTINENTAL MARGINS; ICELAND MANTLE PLUME; JAMESON LAND BASIN; OUTER VORING BASIN; CRUSTAL STRUCTURE; NE ATLANTIC; SEISMIC VOLCANOSTRATIGRAPHY; FAROE-SHETLAND; EVOLUTION;
D O I
10.1111/j.1365-246X.2012.05623.x
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
We study the formation and evolution of the Jan Mayen microcontinent (JMMC) in the framework of conjugate margin evolution in the NorwegianGreenland Sea. The JMMC structural map and crustal architecture have been constrained by seismic mapping and potential field modelling, supplemented by published seismic refraction transects. The sedimentary and basement geometries have been further studied together with their conjugate to refine our knowledge on the less explored microcontinent. Structurally, the JMMC main ridge is characterized by a platform and/or terrace architecture flanked by sag type basins, similar to those described on the mid-Norwegian conjugate margin, while its southern part is marked by windows exposing crustal and/or mantle material that was exhumed during higher degrees of extension. The eastern side of the JMMC broke up in a magma-rich fashion, while the western side is magma poor. The limited amount of magma involved in the JMMC formation suggests that changes in far field forces were the driving mechanism to initiate the isolation process and that a mantle plume had a lesser influence, but might have helped the final mid-ocean ridge establishment between the western Jan Mayen and Greenland margin.
引用
收藏
页码:413 / 435
页数:23
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