Topic
Foliation (geology)
About: Foliation (geology) is a research topic. Over the lifetime, 1309 publications have been published within this topic receiving 17797 citations.
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TL;DR: Berthe et al. as mentioned in this paper proposed two types of foliations in mylonites and mylonitic rocks: (a) S-surfaces related to the accumulation of finite strain and (b) C-surface related to displacement discontinuities or zones of relatively high shear strain.
976 citations
Book•
01 Jan 1994
TL;DR: In this paper, the authors present numerous diagrams showing the stability relations among minerals found in metamorphic rocks and present a systematic way mineralogical changes and assemblages found in the most common types of rocks.
Abstract: This revised edition contains numerous diagrams showing the stability relations among minerals found in metamorphic rocks. Part 1 explains basic principles of metamorphism, introduces metamorphic processes and geologic thermobarometry, and defines metamorphic grade. Part 2 presents in a systematic way mineralogical changes and assemblages found in the most common types of rocks. The computation of the diagrams is based on recent advances in quantitative petrology and geochemistry.
762 citations
TL;DR: In this paper, a detailed analysis of compressional wave velocities in metamorphic and igneous rocks is presented, focusing on the dependence of velocity on porosity, mineral orientation, and mineral composition.
Abstract: Velocities of compressional waves have been measured at pressures of 100 to 10,000 bars for various metamorphic rocks which are believed to be important constituents of the earth's crust. Detailed petrographic and petrofabric analyses are reported from, thin sections cut from the specimens. The principal factors contributing to the velocities of compressional waves in igneous and metamorphic rocks are discussed. Particular attention is given to the dependence of velocity on porosity, mineral orientation, and mineral composition. The principal conclusions are: (1) the initial changes in velocity with pressure are related to the arrangement and shape of pore spaces in a rock, (2) variation of velocity with propagation direction in metamorphic rocks is a consequence of preferred mineral orientation, and (3) velocities calculated from single-crystal data agree with most of the measured velocities.
313 citations
TL;DR: In this paper, an integrated study of geochronological, petrological, and paleontological observations demonstrates that precursors of flysch-facies metasedimentary rocks were deposited along the northern, passive continental margin of the Yangtze plate prior to the Triassic.
Abstract: Greenschist-facies metasedimentary and meta-igneous rocks occur continuously along the northern margin, and sporadically in the interior, of the Dabie-Sulu orogenic belt in east-central China. An integrated study of geochronological, petrological, and paleontological observations demonstrates that precursors of flysch-facies metasedimentary rocks were deposited along the northern, passive continental margin of the Yangtze plate prior to the Triassic, and that protoliths of the meta-igneous rocks are a product of Middle Neoproterozoic bimodal magmatism along the northern margin of this plate. Except for the striking contrast in metamorphic grade, these low-grade rocks generally can be correlated in protolith origin and age with ultrahigh-pressure metamorphic rocks within the orogenic belt. Relationships in time and space between these rocks of contrasting grades can be reasonably interpreted through an accretionary wedge model that links their evolution with continent subduction. The low-grade metamorphic ...
276 citations
TL;DR: Given a spacelike foliation of a spacetime and a marginally outer trapped surface S on some initial leaf, it is proved that under a suitable stability condition S is contained in "horizon" i.e., a smooth 3-surface foliated by marginally outer trapping slices which lie in the leaves of the given foliation.
Abstract: Given a spacelike foliation of a spacetime and a marginally outer trapped surface S on some initial leaf, we prove that under a suitable stability condition S is contained in "horizon" i.e., a smooth 3-surface foliated by marginally outer trapped slices which lie in the leaves of the given foliation. We also show that under rather weak energy conditions this horizon must be either achronal or spacelike everywhere. Furthermore, we discuss the relation between "bounding" and "stability" properties of marginally outer trapped surfaces.
253 citations