Processes and Conditions During Contact Anatexis, Melt Escape and Restite Formation: the Huntly Gabbro Complex, NE Scotland

Droop, G. T. R.; Clemens, J. D.; Dalrymple, D.J.

doi:10.1093/petrology/44.6.995

Cited by 56 publications

(30 citation statements)

References 146 publications

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“…Such textural contrasts have been noted in many migmatite occurences (e.g. Waters & Whales 1984;Powell & Downes 1990;Droop et al 2003) and have been ascribed to melt-fluxed growth of minerals in leucosomes as the solid (peritectic) products of incongruent melting reactions.…”

Section: Textural Contrast Between Leucosomes and Mesosomesmentioning

confidence: 77%

Contact metamorphism and partial melting of Dalradian pelites and semipelites in the southern sector of the Etive aureole

Droop

Moazzen

2007

SJG

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SynopsisContact-metamorphic mineral assemblages are described from Dalradian non-graphitic pelites and semipelites in the southern sector of the Etive thermal aureole, adjacent to the Quarry Diorite ring intrusion. Six metamorphic zones were mapped on the basis of incoming index minerals: I, Biotite; II, Cordierite; III, Andalusite+K-feldspar; IV, Corundum; V, Spinel; VI, Sillimanite. Garnet and orthopyroxene occur locally in high-grade quartz-bearing assemblages. Rocks of the Biotite and Cordierite zones retain their regional-metamorphic textures to a large extent, particularly S 2 crenulation cleavage. Above the Andalusite+K-feldspar isograd the rocks are hornfelses, but relict features of S 2 persist. Rocks of the upper Spinel and Sillimanite zones are agmatic/stromatic migmatites which preserve evidence of local partial melting in the form of S 2 -parallel leucosomes and thin fracture-filling vein leucosomes. All leucosomes are K-feldspar-rich. Vein leucosomes consist mainly of leucogranite with a metaluminous composition and, in the Sillimanite Zone, locally contain crystals of peritectic orthopyroxene and/or cordierite.The compositions of coexisting minerals, determined by EPMA, were used to constrain metamorphic reactions and, with equilibrium thermodynamic calculations, to refine estimates of the P-T conditions of metamorphism. Isograd reactions can generally be modelled satisfactorily in the CNKFMASH system as an isobaric sequence at P=2.2 kbar. An exception is the spinel isograd which occurs at anomalously low T due to the partitioning of Zn into spinel. Estimated isograd temperatures for the And+Kfs, Crn, Spl, melt and Sil isograds are 610°C, 630°C, 660°C, 680°C and 705°C, respectively. Calculated dehydration equilibria yield low values of water activity in the Sillimanite Zone, confirming that partial melting in the innermost aureole occurred under fluid-absent conditions. Leucosome textures and structures suggest that the siliceous microlithons of the former S 2 differentiated crenulation cleavage were the likely sites of melting and provided channels for the movement of melt into brittle fractures to form the vein leucosomes.

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Section: Textural Contrast Between Leucosomes and Mesosomesmentioning

confidence: 77%

Contact metamorphism and partial melting of Dalradian pelites and semipelites in the southern sector of the Etive aureole

Droop

Moazzen

2007

SJG

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“…: Fyfe, 1973;White and Chapell, 1977;Clemens and Vilzeuf, 1987;Bea, 1996;Solar and Brown, 2001) and has been included in many recent contributions (e.g. : Clemens, 2003;Droop et al, 2003). These authors provided unquestionable arguments suggesting a link between high-grade metamorphism, migmatization and granite formation, and this idea has now been accepted by most petrologists.…”

Section: Introductionmentioning

confidence: 95%

The link between partial melting, granitization and granulite development in central Ribeira Fold Belt, SE Brazil: New evidence from elemental and Sr–Nd isotopic geochemistry

Santos

Munhá

Tassinari

et al. 2011

Journal of South American Earth Sciences

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“…The Sr and Ba systematics are consistent with the dependence of the concentrations of these elements on the proportions of feldspar and mica left in the residue during melting. The wide range in Rb and Sr contents suggests variable proportions of feldspar and mica remaining in the source during anatexis (Harris and Inger, 1992;Kalsbeek et al, 2001;Droop et al, 2003;Fazlnia et al, 2007).…”

Section: Genesis Of the Granitoid Rocksmentioning

confidence: 99%

Mineralogical and geochemical characteristics of scheelite-bearing skarns, and genetic relations between skarn mineralization and petrogenesis of the associated granitoid pluton at Sargipali, Sundergarh District, Eastern India

Chowdhury

Lentz

2011

Journal of Geochemical Exploration

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Processes and Conditions During Contact Anatexis, Melt Escape and Restite Formation: the Huntly Gabbro Complex, NE Scotland

Cited by 56 publications

References 146 publications

Contact metamorphism and partial melting of Dalradian pelites and semipelites in the southern sector of the Etive aureole

Contact metamorphism and partial melting of Dalradian pelites and semipelites in the southern sector of the Etive aureole

The link between partial melting, granitization and granulite development in central Ribeira Fold Belt, SE Brazil: New evidence from elemental and Sr–Nd isotopic geochemistry

Mineralogical and geochemical characteristics of scheelite-bearing skarns, and genetic relations between skarn mineralization and petrogenesis of the associated granitoid pluton at Sargipali, Sundergarh District, Eastern India

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