Lyell Collection
Journal of the Geological Society
Lyell Centre  |   Lyell Collection  |   Subscriptions   |   Geological Society  |   Email alerts  |   Online bookshop  |   Help

Keywords:
Author:
Advanced search>>
This Article
Right arrow Full Text (PDF)
Right arrow References
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Right arrow Citation Map
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow Request Permissions
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Maaløe, S.
Right arrow Search for Related Content
GeoRef
Right arrow GeoRef Citation
Journal of the Geological Society; 1981; v. 138; issue.3; p. 223-236;
DOI: 10.1144/gsjgs.138.3.0223
© 1981 Geological Society of London

Article

Magma accumulation in the ascending mantle

S. Maaløe

SUMMARY: The most important factors which control the accumulation of primary magma in the mantle are:

(1) The degree of partial melting required for permeability, which is suggested as10–20%.

(2) The creep properties of the partially molten mantle, the type of creep probably being Nabarro-Herring creep.

(3) The type of flow of the ascending mantle material; the flow may be parallel or divergent dependent on the depth.

(4) The depth of extension of the feeder dykes depending on the tensional stress distribution with depth and the rheological properties of the mantle. It is shown that the partially molten mantle becomes stratified into layers of magma and residuum, the layers of residuum being one or several metres thick. The stratified mantle constitutes the primary source of magma. A dispersed source system is formed in ascending convection currents, while a large magma chamber is formed in ascending plumes.

The small diffusion rates imply that the melting is of a fractional type rather than batch melting.




This article has been cited by other articles:


Home page
 J PetrologyHome page
M. OBATA and E. TAKAZAWA
Compositional Continuity and Discontinuity in the Horoman Peridotite, Japan, and its Implication for Melt Extraction Processes in Partially Molten Upper Mantle
J. Petrology, 2004; 45: 223 - 234.
[Abstract] [Full Text] [PDF]

Home page
 ScienceHome page
G. Sen, G. Sen, and R. E. Jones
Cumulate Xenolith in Oahu, Hawaii: Implications for Deep Magma Chambers and Hawaiian Volcanism
Science, 1990; 249: 1154 - 1157.
[Abstract] [PDF]