Skip Navigation

This Article
Right arrow Full Text Freely available
Right arrow FREE Full Text (PDF) Freely available
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in ISI Web of Science
Right arrow Alert me to new issues of the journal
Right arrow Add to My Personal Archive
Right arrow Download to citation manager
Right arrow Search for citing articles in:
ISI Web of Science (11)
Right arrowRequest Permissions
Google Scholar
Right arrow Articles by LATYPOV, R. M.
Right arrow Search for Related Content
GeoRef
Right arrow GeoRef Citation
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

Journal of Petrology | Volume 44 | Number 9 | Pages 1619-1656 | 2003
© Oxford University Press 2003

The Origin of Basic–Ultrabasic Sills with S-, D-, and I-shaped Compositional Profiles by in Situ Crystallization of a Single Input of Phenocryst-poor Parental Magma

RAIS M. LATYPOV*

GEOLOGICAL INSTITUTE, KOLA SCIENCE CENTRE, APATITY, 184200, RUSSIA

* Corresponding author. Present address: Institute of Geosciences, P.O. Box 3000, FIN—90014, University of Oulu, Oulu, Finland. Telephone: +358 8 553 1452. Fax: +358 8 553 1484. E-mail: rais.latypov{at}oulu.fi

An attempt is made to develop an in situ crystallization model based on the concept of Soret fractionation to explain the origin of commonly observed S-, D-, and I-shaped compositional profiles in sills formed from a single pulse of phenocryst-poor parental magma. The model envisages that the various compositional profiles observed in sills can be interpreted in terms of different combinations of four principal units—Basal Zone and Layered Series forming the floor sequence, and Top Zone and Upper Border Series constituting the roof sequence. The Basal and Top Zones represent mirror images of the Layered and Upper Border Series, respectively, and therefore are referred to as basal and top reversals. It is proposed that the formation of basal and top reversals takes place through the non-equilibrium Soret differentiation of liquid boundary layers which form as a consequence of the temperature gradient imposed by the cold country rock. In contrast, the Layered and Upper Border Series originate predominantly through the crystal–liquid boundary layers developing in equilibrium conditions. The model permits the production of S-, D-, and I-shaped compositional profiles from the same magma composition. All that is necessary to produce a specific shape of compositional profile is an appropriate temperature gradient imposed by the cold country rock on the liquid boundary layers of a parental magma of a given composition.

KEY WORDS: sills; compositional profiles; in situ crystallization; Soret fractionation


Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us    What's this?


This article has been cited by other articles:


Home page
 J PetrologyHome page
R. Latypov
Testing the Validity of the Petrological Hypothesis 'No Phenocrysts, No Post-emplacement Differentiation'
J. Petrology, June 17, 2009; (2009) egp031v1.
[Abstract] [Full Text] [PDF]

Home page
 J PetrologyHome page
F. G. F. GIBB and C. M. B. HENDERSON
Chemistry of the Shiant Isles Main Sill, NW Scotland, and Wider Implications for the Petrogenesis of Mafic Sills
J. Petrology, January 1, 2006; 47(1): 191 - 230.
[Abstract] [Full Text] [PDF]

Home page
 J PetrologyHome page
R. M. LATYPOV
The Origin of Marginal Compositional Reversals in Basic-Ultrabasic Sills and Layered Intrusions by Soret Fractionation
J. Petrology, September 1, 2003; 44(9): 1579 - 1618.
[Abstract] [Full Text] [PDF]


Disclaimer: Please note that abstracts for content published before 1996 were created through digital scanning and may therefore not exactly replicate the text of the original print issues. All efforts have been made to ensure accuracy, but the Publisher will not be held responsible for any remaining inaccuracies. If you require any further clarification, please contact our Customer Services Department.