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1Water Content and Deformation Fabrics in Layered Gabbros:Implications for Rhythmic Layering and Its Effect on Seismic Properties显示文摘0 INTRODUCTION Gabbro,crystalized mantle basaltic melts,is a common rock type on the Earth’s surface that consists of mostly clinopyroxene and plagioclase.It is the dominant component of lower oceanic crust formed by slow cooling and crystallization of upwelling partial melts from the upper mantle in the mid-ocean ridge.Geophysical observations suggest that gabbroic intrusions are also common in the continental lower crusts that have experienced extensive underplating of mantle-derived melts(Thybo and Aetemieva,2013) or exist as crystallized partial melts from mantle plume (Xiao et al.,2004).Hence the deformation of gabbro is of importance for understanding the rheology of oceanic crust and underplated continental crust.Zhonghang Wang Hao Ye Junfeng Zhang Yanguo Fang 2023Journal of Earth Science2023,34,6:0
2Effects of Water on the Rheology of Dominant Minerals and Rocks in the Continental Lower Crust: A Review显示文摘As an important part of the continental lithosphere, the continental lower crust can influence and control many important geodynamic processes, which are of great significance to the evolution of the lithosphere. Extensive plastic deformation is common in continental lower crust. There have been many studies focusing on the rheology of the continental lower crust in the past few decades. This paper provides a review on the effects of water on the rheology of dominant minerals(clinopyroxene, plagioclase and garnet) and rocks in the continental lower crust. The water contents in continental lower crustal minerals and rocks are in general rich and very heterogenous from sample to sample and region to region. Water can significantly reduce the strength of clinopyroxene, plagioclase, garnet and lower crustal rocks. Water can also have a profound influence on fabric development and slip systems in lower crustal minerals. Quantitative experimental investigations and extensive natural studies of water effect on rheology are necessary to refine the classic lithosphere strength profile models and to address the existing controversy on strength of the continental lower crust.Zhonghang Wang Feng Shi Junfeng Zhang 2020Journal of Earth Science2020,31,6:0
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