|
|
 |
|||||||||||||||||
|
|||||||||||||||||
 |
|||||||||||||||||
| JOURNAL HOME | HELP | CONTACT PUBLISHER | SUBSCRIBE | ARCHIVE | SEARCH | TABLE OF CONTENTS |
Department of Geological Sciences, Southern Methodist University, Dallas, Texas 75275, U.S.A.
Correspondence: * E-mail: holdaway{at}mail.smu.edu
Garnet-biotite experiments now exist from Ferry and Spear (1978, FS), Perchuk and Lavrent’eva (1983, PL), and Gessmann et al. (1997, GE). Recent garnet Margules parameters exist from Berman and Aranovich (1996, BA), Ganguly et al. (1996, GA), and Mukhopadhyay et al. (1997, MU). A comparison of 
Gmix plots for garnet binaries shows similarity among models with some significant differences. In all, 20 garnet-biotite geothermometers were retrieved from the various data using a modified form of the approach of Holdaway et al. (1997, HO) such that experimental vs. calculated values of T, in °C, were regressed stepwise to a line with intercept of zero and slope of one, maximizing r2. All tests assumed the GA model for garnet MnMg and the HO Fe3+ correction and WBioTi . The experimental combinations (sets) were: (1) GE + FS with GE values of VIAlBio in FS; (2) PL + FS with GE VIAlBio in FS; (3) PL + FS with GE VIAlBio in FS, increasing WGrMnMg by 5 kJ; (4) PL + FS with no VIAlBio in FS, increasing WGrMnMg by 5 kJ; (5) PL + FS with 0.10 VIAlBio in FS, increasing WGrMnMg by 5 kJ; (6) PL + FS + GE with 0.10 VIAlBio in FS, increasing WGrMnMg by 5 kJ. Models are designated by a number for the experimental set and letters to designate the above garnet model, e.g., 5BA.
Experimental sets vary in maximum r2 as follows: (1) 0.892–0.896; (2) 0.943–0.956; (3) 0.943–0.955; (4) 0.980–0.982; (5) 0.980–0.983; and (6) 0.939–0.944. Application to the HO Maine biotite-garnet data gives the following sequence of increasing quality from experimental sets: 1 < 2 < 3 < 6 < 4 
5. The various garnet models show only small differences in r2 and in quality with the Maine data base. For all 20 models, average T (°C) for the Maine M3 staurolite zone varies between 554(15) and 588(13). The best models appear to be 5BA, 5GA, and 5MU, which allow for 0.10 VIAl in FS biotite. A model based on an average of the three garnet Margules models, 5AV, has some justification and provides a slight improvement. Model 5AV gives (in J) Gex = 40198 – 7.80T; WBioFeMg = 22998 – 17.40T; WAl Bio = 245559 – 280.31T , and Maine M3 average staurolite zone T = 571(12) °C. The high quality of sets based mainly on PL experiments (2–5 above) results in part from their experimental P of 6 kbar. The results suggest that FS biotite contained only minor VIAl. The wide ranges of derived exchange and biotite Margules parameters, which provide reasonable calibrations, indicate that while accuracy in parameters is important, consistency is even more important. These geothermometers (5BA, 5GA, 5MU, 5AV) are available on PC disk. I recommend geothermometer 5AV.
This article has been cited by other articles:
|
|
 |
|
  M.J. Streule, R.J. Phillips, M.P. Searle, D.J. Waters, and M.S.A. Horstwood Evolution and chronology of the Pangong Metamorphic Complex adjacent to the Karakoram Fault, Ladakh: constraints from thermobarometry, metamorphic modelling and U-Pb geochronology Journal of the Geological Society, September 1, 2009; 166(5): 919 - 932. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 V. J. van Hinsberg and J. C. Schumacher The geothermobarometric potential of tourmaline, based on experimental and natural data American Mineralogist, May 1, 2009; 94(5-6): 761 - 770. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 S. Dasgupta, S. Chakraborty, and S. Neogi Petrology of an inverted Barrovian sequence of metapelites in Sikkim Himalaya, India: Constraints on the tectonics of inversion Am J Sci, January 1, 2009; 309(1): 43 - 84. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
G.H.-N. Chan, D.J. Waters, M.P. Searle, J.C. Aitchison, M.S.A. Horstwood, Q. Crowley, C.-H. Lo, and J.S.-L. Chan Probing the basement of southern Tibet: evidence from crustal xenoliths entrained in a Miocene ultrapotassic dyke Journal of the Geological Society, January 1, 2009; 166(1): 45 - 52. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 T.C. Chudy, A. Zeh, A. Gerdes, R. Klemd, and J.M. Barton Jr. Palaeoarchaean (3.3 Ga) mafic magmatism and Palaeoproterozoic (2.02 Ga) amphibolite-facies metamorphism in the Central Zone of the Limpopo Belt: New geochronological, petrological and geochemical constraints from metabasic and metapelitic rocks from the Venetia area South African Journal of Geology, December 1, 2008; 111(4): 387 - 408. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 M. L. Wells and T. D. Hoisch The role of mantle delamination in widespread Late Cretaceous extension and magmatism in the Cordilleran orogen, western United States Geological Society of America Bulletin, May 1, 2008; 120(5-6): 515 - 530. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 J. L. Anderson, A. P. Barth, J. L. Wooden, and F. Mazdab Thermometers and Thermobarometers in Granitic Systems Reviews in Mineralogy and Geochemistry, January 1, 2008; 69(1): 121 - 142. [Full Text] [PDF]
|
|
|
|
 |
|
 L. Saha, S. K. Bhowmik, M. Fukuoka, and S. Dasgupta Contrasting Episodes of Regional Granulite-Facies Metamorphism in Enclaves and Host Gneisses from the Aravalli Delhi Mobile Belt, NW India J. Petrology, January 1, 2008; 49(1): 107 - 128. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 S. Chakraborty, S. Dasgupta, and S. Neogi Nucleation kinetics controlled by chemical overstepping and its tectonic implications: an example from the Sikkim Himalaya European Journal of Mineralogy, December 1, 2007; 19(6): 791 - 803. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
V. J. van Hinsberg, E. Zinngrebe, H. d. Wijs, and S. P. Vriend Thermo-chronology of the Barlet metamorphic basement unit: evidence for a Stephanian thermal event linked to Sb mineralization in the Haut Allier, France Journal of the Geological Society, March 1, 2007; 164(2): 393 - 404. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
C.-M. WU and G. ZHAO Recalibration of the Garnet-Muscovite (GM) Geothermometer and the Garnet-Muscovite-Plagioclase-Quartz (GMPQ) Geobarometer for Metapelitic Assemblages J. Petrology, December 1, 2006; 47(12): 2357 - 2368. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
W. S. BOARD, H. E. FRIMMEL, and R. A. ARMSTRONG Pan-African Tectonism in the Western Maud Belt: P-T-t Path for High-grade Gneisses in the H.U. Sverdrupfjella, East Antarctica J. Petrology, April 1, 2005; 46(4): 671 - 699. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 B. R. Frost, S. M. Swapp, and R. W. Gregory PROLONGED EXISTENCE OF SULFIDE MELT IN THE BROKEN HILL OREBODY, NEW SOUTH WALES, AUSTRALIA Can Mineral, February 1, 2005; 43(1): 479 - 493. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
C.-M. WU, J. ZHANG, and L.-D. REN Empirical Garnet-Biotite-Plagioclase-Quartz (GBPQ) Geobarometry in Medium- to High-Grade Metapelites J. Petrology, September 1, 2004; 45(9): 1907 - 1921. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 M. J. Holdaway and M. J. Holdaway Optimization of some key geothermobarometers for pelitic metamorphic rocks Mineralogical Magazine, February 1, 2004; 68(1): 1 - 14. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 H. Lorenz, A. M. Pystin, V. G. Olovyanishnikov, and D. G. Gee Neoproterozoic high-grade metamorphism of the Kanin Peninsula, Timanide Orogen, northern Russia Geological Society, London, Memoirs, January 1, 2004; 30(1): 59 - 68. [Abstract] [PDF]
|
|
|
|
|
|
R. Buchwaldi, R. Buchwaldt, R. D. Tucker, and R. F. Dymek Geothermobarometry and U-Pb Geochronology of metapelitic granulites and pelitic migmatites from the Lokoho region, Northern Madagascar American Mineralogist, November 1, 2003; 88(11-12): 1753 - 1768. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M. P. Searle, M.P. SEARLE, R.L. SIMPSON, R.D. LAW, R.R. PARRISH, and D.J. WATERS The structural geometry, metamorphic and magmatic evolution of the Everest massif, High Himalaya of Nepal-South Tibet Journal of the Geological Society, May 1, 2003; 160(3): 345 - 366. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
R. J. Tracy, R. J. Tracy, and J. S. Beard Manganoan kinoshitalite in Mn-rich marble and skarn from Virginia American Mineralogist, May 1, 2003; 88(5-6): 740 - 747. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
T. E. Johnson, T. E. Johnson, M. Brown, and G. S. Solar Low-pressure subsolidus and suprasolidus phase equilibria in the MnNCKFMASH system: Constraints on conditions of regional metamorphism in western Maine, northern Appalachians American Mineralogist, April 1, 2003; 88(4): 624 - 638. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. S. Beard and R. J. Tracy Spinels and other oxides in Mn-rich rocks from the Hutter Mine, Pittsylvania County, Virginia, U.S.A.: Implications for miscibility and solvus relations among jacobsite, galaxite, and magnetite American Mineralogist, May 1, 2002; 87(5-6): 690 - 698. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
D.J. Waters and N.R. Charnley Local equilibrium in polymetamorphic gneiss and the titanium substitution in biotite American Mineralogist, April 1, 2002; 87(4): 383 - 396. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M. B. HOLNESS and G. R. WATT The Aureole of the Traigh Bhan na Sgurra Sill, Isle of Mull: Reaction-Driven Micro-cracking During Pyrometamorphism J. Petrology, March 1, 2002; 43(3): 511 - 534. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
W. D. Carlson Scales of disequilibrium and rates of equilibration during metamorphism American Mineralogist, February 1, 2002; 87(2-3): 185 - 204. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
T. D. Hoisch, M. L. Wells, and L. M. Hanson Pressure-temperature paths from garnet-zoning: Evidence for multiple episodes of thrust burial in the hinterland of the Sevier orogenic belt American Mineralogist, January 1, 2002; 87(1): 115 - 131. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. R. ASHWORTH, V. S. SHEPLEV, V. V. KHLESTOV, and V. A. ANANYEV Geothermobarometry using minerals at non-equilibrium: a corona example European Journal of Mineralogy, December 1, 2001; 13(6): 1153 - 1161. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M.J. Holdaway Recalibration of the GASP geobarometer in light of recent garnet and plagioclase activity models and versions of the garnet-biotite geothermometer American Mineralogist, October 1, 2001; 86(10): 1117 - 1129. [Abstract] [Full Text] [PDF]
|
|
| JOURNAL HOME | HELP | CONTACT PUBLISHER | SUBSCRIBE | ARCHIVE | SEARCH | TABLE OF CONTENTS |
