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논문 기본 정보

자료유형
학술저널
저자정보
Xiaojun Feng (China University of Mining and Technology Xuzhou) Enyuan Wang (China University of Mining and Technolog) Prince O. Amponsah (University of Ghana) Jérôme Ganne (Observatoire Midi Pyrénées France) Roland Martin (Observatoire Midi Pyrénées France) Mark W. Jessell (Observatoire Midi Pyrénées France)
저널정보
한국지질과학협의회 Geosciences Journal Geosciences Journal Vol.23 No.6
발행연도
2019.1
수록면
961 - 975 (15page)

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초록· 키워드

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3D thermo-mechanical models have been constructed to explore the influence of pre-existing faults on the temporalspatial distribution of high-grade amphibolite-granulite facies metamorphic rocks during extension. The different dip amounts of three pre-existing faults (refer to the Bole-Nangodi shear zones, the Jirapa shear zone and the Bulenga shear zone in the study area) are studied in models. The results show the lower crust exhumes occur at a relatively low rate prior to attaining a Stretching Factor = 4.2%. The partially molten lower crustal rocks tend to move (up to 20 km) towards the center of the model and focus exhumation in regions where pre-existing faults intersect. The high-strain corridors in models are used to understand the loci of exhumation in the Bole-Bulenga domain of NW Ghana. Accordingly, in the eastern and western parts of the high-grade rock corridors in NW Ghana, partially molten rocks exhumed from the lower into middle-upper crustal levels are interpreted to have been dominantly facilitated by the km-scale high-strain corridors. In the central part of the Bole-Bulenga domain, the high-grade rocks are interpreted to have been exhumed because of a coupling between two mechanisms: (1) The exhumation of partially molten rocks between the Jirapa and Bole-Nangodi faults increases in spatially due to the reduction in space from north to south. (2) The exhumation of lower partially molten rocks in the central part, as a result of inherited orthogonal (E-W) structures.

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