Magnetotelluric Phase Anisotropy above Extensional Structures of the Neogene Pannonian Basin

A. Ádám
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引用次数: 5

Abstract

Neogene extensional forces generated narrow rift zones (deep subbasins) in the Pannonian Basin, among others one of the deepest, the 7 km deep Bekes graben. Above this structure strong magnetotelluric (MT) phase anisotropy (phase-deviation in two orthogonal directions) has been observed indicating the upwelling of the partially molten asthenosphere. This upwelling is certainly the first to prove the validity of the deep mantle structure of Buck's extensional narrow rift model by an electromagnetic method. A geotectonic relation will also be pointed out between the causes of MT phase anisotropy in cratonic and orogenic belts.
新近系潘盆系伸展构造上大地电磁相位各向异性
新近纪伸展力在潘诺尼亚盆地形成了狭窄的裂谷带(深次盆地),其中最深的裂谷带之一是深7公里的Bekes地堑。在这一构造之上,大地电磁(MT)的相位各向异性(在两个正交方向上的相位偏差)很强,表明部分熔融的软流层呈上升流。这一上升流首次用电磁法证明了巴克伸展窄裂谷模型深部地幔结构的有效性。并指出克拉通带和造山带MT相各向异性的成因与大地构造的关系。
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