Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/7243
AuthorsMollo, S.* 
Lanzafame, G.* 
Masotta, M.* 
Iezzi, G.* 
Ferlito, C.* 
Scarlato, P.* 
TitleCooling history of a dike as revealed by mineral chemistry: A case study from Mt. Etna volcano
Issue Date7-Jul-2011
Series/Report no./288 (2011)
DOI10.1016/j.chemgeo.2011.06.016
URIhttp://hdl.handle.net/2122/7243
Keywordsdike
clinopyroxene
Subject Classification04. Solid Earth::04.04. Geology::04.04.05. Mineralogy and petrology 
AbstractSeven rock samples were systematically collected from innermost to the outermost portion of a dike outcropping at Mt. Etna volcano. Results show that, from dike core-to-rim, plagioclase, clinopyroxene and titanomagnetite show compositional variations due to increasing cooling rate. Plagioclase is progressively enriched in An from innermost to the outermost part of the dike. Similarly, clinopyroxene components En+ CaTs+CaFeTs increase, whereas Di+Hd decrease. The Usp content in titanomagnetite also systematically decrease from dike core-to-rim. Partition coefficients and thermometers based on the crystal-liquid exchange reaction indicate that, due to rapid cooling rates at the dike outer portions, early-formed crystal nuclei do not re-equilibrate with the melt. The chemistry of minerals progressively deviates from that of equilibrium; consequently, from dike core-to-rim, mineral compositions resemble those of high-temperature formation. The chemical variations of clinopyroxene and plagioclase in dike samples mirror those obtained from cooling experiments carried out on alkaline basalts. Accordingly, we used an experimental equation based on clinopyroxene compositional variation as a function of cooling rate to determine the cooling conditions experienced by the crystals during dike emplacement. The estimated cooling rates are comparable to those predicted by thermal modeling based on an explicit finite-difference scheme.
Appears in Collections:Papers Published / Papers in press

Files in This Item:
File Description SizeFormat 
1_Mollo et al. 2011_Chemical Geology_288_39-52.pdfMain article1.73 MBAdobe PDFView/Open
Show full item record

Page view(s)

86
Last Week
0
Last month
checked on Jun 28, 2017

Download(s)

23
checked on Jun 28, 2017

Google ScholarTM

Check

Altmetric