地质论评2011，Vol.57Issue(6)：851-869,19.
部分熔融岩石流变学
Rheology of Partially Molten Rocks: a State-of-the-art Overview
摘要
Abstract
This paper provides a state-of-the-art overview on the melt morphology and distribution in partially molten rocks under hydrostatic and dynamic conditions with special focuses on the influence of partial melting on rheological behavior of peridotite and granite. Partial melting controls most of the important geological processes ( e. G. , formation of the crust, compositional evolution of the mantle) and the physical properties of deep crust and upper mantle ( e. G. , electrical conductivity, anelasticity, seismic wave velocities, and permeability). The understanding of the rheological properties of partially molten rocks is thus essential for modeling precisely large-scale geological processes including mechanical coupling between the crust and lithospheric mantle, convection of asthenosphere, plate tectonics, channel flow of middle to lower crust, mountain-building mechanisms. Significant progress in both experimental and theoretical studies occurred during the last three decades and has promoted our understanding of the rheological properties of partially molten rocks. The following consensus has been reached: under hydrostatic conditions, melt whose volume fraction is less than ~ 2% is generally restricted to the triple junctions or along grain edges. The degree of melt wetting increases with increasing pressure, temperature and melt fraction. Under non-hydrostatic conditions (either coaxial compression or simple shear), however, melt occurs predominantly along extensional shear bands aligned at angles of about 15° ~ 30° to the maximum principal compressive stress. The presence of <5% melt results hence in only a modest rheological weakening due to the heterogeneous distribution of melt. With increasing the melt fraction, the partially molten rocks are significantly weakened, which leads to deformation-induced melt segregation or extraction.关键词
部分熔融/熔体形态与分布/二面角/流变学/大应变剪切/地球动力学Key words
Partial melting/Melt morphology and distribution/Dihedral angle/Rheology/Large shear strain/Geodynamics引用本文复制引用
邵同宾,嵇少丞,王茜..部分熔融岩石流变学[J].地质论评,2011,57(6):851-869,19.基金项目
本文为中国科学院知识创新工程重要方向项目(编号KZCX2-YW-Q08-034),国家自然科学基金项目(编号40772029),中国科学院“百人计划”项目(编号KZCX-0733221A07)、青藏高原东部和东南部岩石圈流变学及地球物理性质研究项目(编号1212011121274)、国土资源部深部探测技术与实验研究专项课题(编号SinoProbe-07)、中国科学院知识创新工程领域前沿项目(编号GIGCX-09-02)的成果. （编号KZCX2-YW-Q08-034）
