Mechanisms of magma transport and storage in the lower and middle crust-magma segregation, ascent and emplacement

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Abstract

Felsic and mafic magmas in continental crustal settings are derived by melting of the lower crust and mantle, respectively. This occurs in subduction zone, collisional, extensional and intraplate settings. This chapter reviews the linked processes of magma segregation, ascent and emplacement in the deep to mid-crust, with an emphasis on felsic magmas and continental crustal settings. We follow felsic magmas from their segregation and extraction from deep crustal anatectic zones, to their focusing into either bulk or channelled ascent pathways, to their emplacement in large tabular magma reservoirs in the mid-crust. We argue that crustal-scale magma plumbing systems are self-organised from the bottom-up, whereby the efficiency and rate of melt segregation and the mechanism of magma focusing in source regions determine the mode of magma ascent and eventual length and time scales of pluton location and growth in the mid-crust.

Original languageEnglish
Title of host publicationVolcanic and Igneous Plumbing Systems
Subtitle of host publicationUnderstanding Magma Transport, Storage, and Evolution in the Earth's Crust
EditorsSteffi Burchardt
Place of PublicationAmsterdam
PublisherElsevier
Chapter2
Pages13-53
Number of pages41
ISBN (Electronic)9780128097496
ISBN (Print)9780128097502
DOIs
Publication statusPublished - 1 Jan 2018

Keywords

  • Diapirism
  • Dykes
  • Intrusion filling rates and times
  • Magma ascent
  • Magma emplacement
  • Melt extraction and segregation
  • Melting
  • Migmatites
  • Plutons
  • Stoping

Cite this

Cruden, A. R., & Weinberg, R. F. (2018). Mechanisms of magma transport and storage in the lower and middle crust-magma segregation, ascent and emplacement. In S. Burchardt (Ed.), Volcanic and Igneous Plumbing Systems: Understanding Magma Transport, Storage, and Evolution in the Earth's Crust (pp. 13-53). Elsevier. https://doi.org/10.1016/B978-0-12-809749-6.00002-9