Impact of melt segregation on tonalite-trondhjemite-granodiorite (TTG) petrogenesis

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doi: 10.1017/S0263593300001486
Authors:Rushmer, Tracy; Jackson, Matt
Author Affiliations:Primary:
University of Vermont, Department of Geology, Burlington, VT, United States
Imperial College, United Kingdom
Volume Title:Transactions of the Royal Society of Edinburgh: Earth Sciences
Source:Transactions of the Royal Society of Edinburgh: Earth Sciences, 97(4), p.325-336. Publisher: RSE Scotland Foundation, Edinburgh, United Kingdom. ISSN: 0263-5933
Publication Date:2006
Note:In English
Summary:Archaean TTGs and more recent adakite-like magmas have been investigated using an experimental approach which, when coupled with numerical models, allows some of the problems of TTG genesis to be addressed. The experiments are designed to reproduce the local changes in bulk composition that are predicted to occur in response to buoyancy driven melt segregatioin along grain edges, and associated compaction of the solid residue. This preliminary study documents the changes observed in the melt composition and melt and solid phase modes between earlier direct partial melting and the new segregation equilibration expeiments on metabasalt bulk compositions.The results suggest that if dynamic melt segregation and equilibrium processes are active, they may modify the normally robust geochemical indicators, such as Mg-numbers, which are used typically to develop models of TTG petrogenesis. [G.L.B.]
Subsections:Igneous rocks
Subjects:Adakites; Archean; Buoyancy; Chemical composition; Compaction; Equilibrium; Experimental studies; Genesis; Igneous rocks; Magmas; Melting; Melts; Metabasalt; Metaigneous rocks; Metamorphic rocks; Numerical models; Partial melting; Precambrian; Segregation; Solid phase; Tectonics; Tonalite-trondhjemite-granodiorite magmas; Volcanic rocks
Abstract Numbers:08M/3529
Record ID:2016021898
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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