Journal of Petrology | Volume 37 | Number 2 | Pages 395-414 | 1996
© Oxford University Press 1996
research-article |
Metapelitic Migmatites from Brattstrand Bluffs, East Antarctica—Metamorphism, Melting and Exhumation of the Mid Crust
DEPARTMENT OF GEOLOGY AND GEOPHYSICS, UNIVERSITY OF EDINBURGH, THE GRANT INSTITUTE WEST MAINS ROAD, EDINBURGH EH9 SJW, UK
Received August 22, 1995; Revised typescript accepted November 6, 1995
ABSTRACT
Metapelitic migmatites at Brattstrand Bluffs, East Antarctica, preserve granulite assemblages and a complex deformational history. Crystallized granitic melt accounts for 
25% of exposed rocks, and was produced by biotite dehydration-melting reactions in the host metapelite. Variable degrees of melt production and extraction resulted in a range of bulk compositions in the residual metapelite, from quartz-rich migmatites to restitic quartz-absent pelite. Decompressional reaction textures indicate 11 km of exhumation after peak metamorphism at P—T conditions of 6 kbar and 860°C Decompression occurred during a single cycle of partial melting and melt crystallization at 500 Ma, and was synchronous with tectonic unroofing of the Brattstrand Bluffs migmatites along ductile shear zones. Exhumation has been proposed as a cause of dehydration melting in the Himalaya and elsewhere, but melting at Brattstrand Bluffs was ultimately driven by the tectonic perturbation and subsequent thermal relaxation responsible for high metamorphic temperatures. Exhumation did not drive melting reactions, but it is likely that the presence of melt focused deformation in the migmatites and thus promoted exhumation.
KEY WORDS: decompression; exhumation; granulite; melting; migmalite
*Corresponding author.
CiteULike 
Connotea 
Del.icio.us What's this?
This article has been cited by other articles:
|
|
 |
|
  G. Phillips, D. E. Kelsey, A. F. Corvino, and R. A. Dutch Continental Reworking during Overprinting Orogenic Events, Southern Prince Charles Mountains, East Antarctica J. Petrology, November 1, 2009; 50(11): 2017 - 2041. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 Y. Wang, D. Liu, S.-L. Chung, L. Tong, and L. Ren SHRIMP zircon age constraints from the Larsemann Hills region, Prydz Bay, for a late Mesoproterozoic to early Neoproterozoic tectono-thermal event in East Antarctica Am J Sci, April 1, 2008; 308(4): 573 - 617. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 Y. Suda, Y. Kawano, G. Yaxley, H. Korenaga, and Y. Hiroi Magmatic evolution and tectonic setting of metabasites from Lutzow-Holm Complex, East Antarctica Geological Society, London, Special Publications, January 1, 2008; 308(1): 211 - 233. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
X. Liu, Y. Zhao, G. Zhao, P. Jian, and G. Xu Petrology and Geochronology of Granulites from the McKaskle Hills, Eastern Amery Ice Shelf, Antarctica, and Implications for the Evolution of the Prydz Belt J. Petrology, August 1, 2007; 48(8): 1443 - 1470. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 E. S. Grew, T. Armbruster, O. Medenbach, M. G. Yates, and C. J. Carson Chopinite, [(Mg, Fe)3{square}](PO4)2, a new mineral isostructural with sarcopside, from a fluorapatite segregation in granulite-facies paragneiss, Larsemann Hills, Prydz Bay, East Antarctica European Journal of Mineralogy, March 1, 2007; 19(2): 229 - 245. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
S. Bhadra, S. Das, and A. Bhattacharya Shear Zone-hosted Migmatites (Eastern India): the Role of Dynamic Melting in the Generation of REE-depleted Felsic Melts, and Implications for Disequilibrium Melting J. Petrology, March 1, 2007; 48(3): 435 - 457. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 E. S. Grew, T. Armbruster, O. Medenbach, M. G. Yates, and C. J. Carson Stornesite-(Y), (Y, Ca){square}2Na6(Ca,Na)8(Mg,Fe)43(PO4)36, the first terrestrial Mg-dominant member of the fillowite group, from granulite-facies paragneiss in the Larsemann Hills, Prydz Bay, East Antarctica American Mineralogist, August 1, 2006; 91(8-9): 1412 - 1424. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 R. F. Martin and C. De Vito THE PATTERNS OF ENRICHMENT IN FELSIC PEGMATITES ULTIMATELY DEPEND ON TECTONIC SETTING Can Mineral, December 1, 2005; 43(6): 2027 - 2048. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
S. K. BHOWMIK, A. B. SARBADHIKARI, B. SPIERING, and M. M. RAITH Mesoproterozoic Reworking of Palaeoproterozoic Ultrahigh-temperature Granulites in the Central Indian Tectonic Zone and its Implications J. Petrology, June 1, 2005; 46(6): 1085 - 1119. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
R. W. WHITE, R. POWELL, and G. L. CLARKE Prograde Metamorphic Assemblage Evolution during Partial Melting of Metasedimentary Rocks at Low Pressures: Migmatites from Mt Stafford, Central Australia J. Petrology, November 1, 2003; 44(11): 1937 - 1960. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
L. Ren, E. S. Grew, M. Xiong, and Z. Ma WAGNERITE-Ma5bc, A NEW POLYTYPE OF Mg2(PO4)(F,OH), FROM GRANULITE-FACIES PARAGNEISS, LARSEMANN HILLS, PRYDZ BAY, EAST ANTARCTICA Can Mineral, April 1, 2003; 41(2): 393 - 411. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
X. LIU, Z. ZHAO, Y. ZHAO, J. CHEN, and X. LIU Pyroxene exsolution in mafic granulites from the Grove Mountains, East Antarctica: constraints on Pan-African metamorphic conditions European Journal of Mineralogy, February 1, 2003; 15(1): 55 - 65. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M. Yoshida, J. Jacobs, M. Santosh, and H. M. Rajesh Role of Pan-African events in the Circum-East Antarctic Orogen of East Gondwana: a critical overview Geological Society, London, Special Publications, January 1, 2003; 206(1): 57 - 75. [Abstract] [PDF]
|
|
|
|
|
|
I. C. W. Fitzsimons Proterozoic basement provinces of southern and southwestern Australia, and their correlation with Antarctica Geological Society, London, Special Publications, January 1, 2003; 206(1): 93 - 130. [Abstract] [PDF]
|
|
|
|
|
|
S. L. Harley Archaean-Cambrian crustal development of East Antarctica: metamorphic characteristics and tectonic implications Geological Society, London, Special Publications, January 1, 2003; 206(1): 203 - 230. [Abstract] [PDF]
|
|
|
|
|
|
Y. Zhao, X. H. Liu, X. C. Liu, and B. Song Pan-African events in Prydz Bay, East Antarctica, and their implications for East Gondwana tectonics Geological Society, London, Special Publications, January 1, 2003; 206(1): 231 - 245. [Abstract] [PDF]
|
|
|
|
|
|
P. THOMPSON, S. L. HARLEY, and D. P. CARRINGTON Sodium and potassium in cordierite - a potential thermometer for melts? European Journal of Mineralogy, June 1, 2002; 14(3): 459 - 469. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
S. L. HARLEY and D. P. CARRINGTON The Distribution of H2O between Cordierite and Granitic Melt: H2O Incorporation in Cordierite and its Application to High-grade Metamorphism and Crustal Anatexis J. Petrology, September 1, 2001; 42(9): 1595 - 1620. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 G. R. Watt, N. H. S. Oliver, and B. J. Griffin Evidence for reaction-induced microfracturing in granulite facies migmatites Geology, April 1, 2000; 28(4): 327 - 330. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
P. Sengupta, J. Sen, S. Dasgupta, M. Raith, U. K. Bhui, and J. Ehl Ultra-high Temperature Metamorphism of Metapelitic Granulites from Kondapalle, Eastern Ghats Belt: Implications for the Indo-Antarctic Correlation J. Petrology, July 1, 1999; 40(7): 1065 - 1087. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
A. Kalt, A. Berger, and P. Blumel Metamorphic Evolution of Cordierite-Bearing Migmatites from the Bayerische Wald (Variscan Belt, Germany) J. Petrology, April 1, 1999; 40(4): 601 - 627. [Abstract] [Full Text] [PDF]
|
|