Advanced search
1 file | 2.43 MB

Granite formation: stepwise accumulation of melt or connected networks?

Author
Organization
Abstract
Several authors have proposed that granitic melt accumulation and transport from the source region occurs in networks of connected melt-filled veins and dykes. These models envisage the smallest leucosomes as 'rivulets' that connect to feed larger dykes that form the 'rivers' through which magma ascends through the sub-solidus crust. This paper critically reviews this 'rivulets-feeding-rivers' model. It is argued that such melt-filled networks are unlikely to develop in nature, because melt flows and accumulates well before a fully connected network can be established. In the alternative stepwise accumulation model, flow and accumulation is transient in both space and time. Observations on migmatites at Port Navalo, France, that were used to support the existence of melt-filled networks are discussed and reinterpreted. In this interpretation, the structures in these migmatites are consistent with the collapse and draining of individual melt batches, supporting the stepwise accumulation model.
Keywords
LACHLAN FOLD BELT, CONTINENTAL-CRUST, SOUTHERN BRITTANY, EARTHS CRUST, FELSIC MAGMA, SELF-ORGANIZATION, FLANKING FOLDS, VARISCAN BELT, SIMPLE SHEAR, GRAIN-SCALE, leucosomes, melt accumulation, melt networks, migmatite, Port Navalo, stepwise accumulation

Downloads

  • (...).pdf
    • full text
    • |
    • UGent only
    • |
    • PDF
    • |
    • 2.43 MB

Citation

Please use this url to cite or link to this publication:

Chicago
Bons, Paul D, Jens K Becker, Marlina Elburg, and Kristjan Urtson. 2010. “Granite Formation: Stepwise Accumulation of Melt or Connected Networks?” Earth and Environmental Science Transactions of the Royal Society of Edinburgh 100 (1-2): 105–115.
APA
Bons, P. D., Becker, J. K., Elburg, M., & Urtson, K. (2010). Granite formation: stepwise accumulation of melt or connected networks? EARTH AND ENVIRONMENTAL SCIENCE TRANSACTIONS OF THE ROYAL SOCIETY OF EDINBURGH, 100(1-2), 105–115. Presented at the 6th Hutton Symposium on Origin of Granites and Related Rocks.
Vancouver
1.
Bons PD, Becker JK, Elburg M, Urtson K. Granite formation: stepwise accumulation of melt or connected networks? EARTH AND ENVIRONMENTAL SCIENCE TRANSACTIONS OF THE ROYAL SOCIETY OF EDINBURGH. 2010;100(1-2):105–15.
MLA
Bons, Paul D, Jens K Becker, Marlina Elburg, et al. “Granite Formation: Stepwise Accumulation of Melt or Connected Networks?” EARTH AND ENVIRONMENTAL SCIENCE TRANSACTIONS OF THE ROYAL SOCIETY OF EDINBURGH 100.1-2 (2010): 105–115. Print.
@article{1234321,
  abstract     = {Several authors have proposed that granitic melt accumulation and transport from the source region occurs in networks of connected melt-filled veins and dykes. These models envisage the smallest leucosomes as 'rivulets' that connect to feed larger dykes that form the 'rivers' through which magma ascends through the sub-solidus crust. This paper critically reviews this 'rivulets-feeding-rivers' model. It is argued that such melt-filled networks are unlikely to develop in nature, because melt flows and accumulates well before a fully connected network can be established. In the alternative stepwise accumulation model, flow and accumulation is transient in both space and time. Observations on migmatites at Port Navalo, France, that were used to support the existence of melt-filled networks are discussed and reinterpreted. In this interpretation, the structures in these migmatites are consistent with the collapse and draining of individual melt batches, supporting the stepwise accumulation model.},
  author       = {Bons, Paul D and Becker, Jens K and Elburg, Marlina and Urtson, Kristjan},
  issn         = {1755-6910},
  journal      = {EARTH AND ENVIRONMENTAL SCIENCE TRANSACTIONS OF THE ROYAL SOCIETY OF EDINBURGH},
  keywords     = {LACHLAN FOLD BELT,CONTINENTAL-CRUST,SOUTHERN BRITTANY,EARTHS CRUST,FELSIC MAGMA,SELF-ORGANIZATION,FLANKING FOLDS,VARISCAN BELT,SIMPLE SHEAR,GRAIN-SCALE,leucosomes,melt accumulation,melt networks,migmatite,Port Navalo,stepwise accumulation},
  language     = {eng},
  location     = {Stellenbosch, South Africa},
  number       = {1-2},
  pages        = {105--115},
  title        = {Granite formation: stepwise accumulation of melt or connected networks?},
  url          = {http://dx.doi.org/10.1017/S175569100901603X},
  volume       = {100},
  year         = {2010},
}

Altmetric
View in Altmetric
Web of Science
Times cited: