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aluminum hornblende

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Journal Article
Published: 01 February 1991
American Mineralogist (1991) 76 (1-2): 176–188.
...Christopher R. Vyhnal; Harry Y. McSween; J. Alexander Speer Abstract Recent studies differ on whether the Al content of hornblende in granitic rocks is pres- sure dependent or has a temperature dependence which masks any pressrue effect. To test these hypotheses, hornblendes in 15 late Paleozoic...
Journal Article
Journal: GSA Bulletin
Published: 01 May 1998
GSA Bulletin (1998) 110 (5): 685–690.
Journal Article
Journal: GSA Bulletin
Published: 01 September 1997
GSA Bulletin (1997) 109 (9): 1223–1227.
Journal Article
Journal: Geology
Published: 01 June 1997
Geology (1997) 25 (6): 563–566.
...Jay J. Ague Abstract The aluminum-in-hornblende (AH) barometer has been widely used to estimate the emplacement pressure ( P ) of granitic rocks. Application of the barometer has remained controversial because the controls on the aluminum content of hornblende imposed by temperature ( T ), magma...
Journal Article
Journal: GSA Bulletin
Published: 01 April 1996
GSA Bulletin (1996) 108 (4): 471–488.
...Jay J. Ague; Mark T. Brandon Abstract We have developed a new quantitative method to estimate paleohorizontal in granitic plutons using the aluminum-in-hornblende (AH) barometer. The method is used to correct previously published paleomagnetic data from the 93–96 Ma Mount Stuart batholith...
Journal Article
Journal: Geology
Published: 01 October 1990
Geology (1990) 18 (10): 938–941.
...Christopher R. Vyhnal; Harry Y. McSween, Jr. Abstract Aluminum-in-hornblende barometry of Alleghanian granitoid plutons in the southern Appalachian Piedmont provides new constraints on synorogenic, vertical crustal displacements. Systematic differences in depths of emplacement between plutons...
Journal Article
Journal: Geology
Published: 01 October 1989
Geology (1989) 17 (10): 897–900.
... proposed based on the total Al content (Al T ) of near-solidus calcic hornblendes in tonalite and granodiorite intrusive rocks in the pressure range < 1 to 8 kbar. Pressures were estimated from mineral assemblages in associated metamorphic country rocks. We report experimental data on newly crystallized...
Journal Article
Journal: Geology
Published: 01 September 1989
Geology (1989) 17 (9): 837–841.
...Marie C. Johnson; Malcolm J. Rutherford Abstract A new geobarometer based on the Al content of igneous hornblendes in equilibrium with melt, fluid, biotite, quartz, sanidine, plagioclase, sphene, and magnetite or ilmenite has been calibrated experimentally. The calibration was performed...
Journal Article
Published: 01 December 1986
American Mineralogist (1986) 71 (11-12): 1297–1313.
...Jane M. Hammarstrom; E-an Zen Abstract Electron-microprobe analyses of hornblendes from five calc-alkalic plutonic complexes representing low- and high-pressure regimes define a tightly clustered linear trend in terms of total Al (A1 T ) and tetrahedral Al (Al iv ) contents per 23 oxygens: Al iv...
Journal Article
Journal: Economic Geology
Published: 01 November 2010
Economic Geology (2010) 105 (7): 1191–1241.
.... The Yanacocha calc-alkaline suite was oxidized, water and sulfate rich, and evolved from early pyroxene>hornblende andesite to late titanite-bearing dacite and minor rhyolite. Several dacites contain populations of both high- and low-aluminum hornblendes that crystallized in the middle and upper crust...
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TABLE 1. <span class="search-highlight">ALUMINUM</span>-IN-<span class="search-highlight">HORNBLENDE</span> BAROMETRY
Published: 01 September 2001
TABLE 1. ALUMINUM-IN-HORNBLENDE BAROMETRY
Journal Article
Published: 01 August 2002
American Mineralogist (2002) 87 (8-9): 1062–1076.
... to the TWQ manual ( Berman 1991 ) for the schemes used to recalculate structural formulae. The nearly identical pressure estimates obtained for the rim and core populations using this reaction strongly support the inference that the aluminum zoning in the Fish Canyon hornblendes is a consequence of near...
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<span class="search-highlight">Hornblende</span> geochemical data for the tuff of Elevenmile Canyon determined by...
Published: 14 February 2019
Figure 8. Hornblende geochemical data for the tuff of Elevenmile Canyon determined by electron microbe (Supplementary Data Table DR3). (A) Aluminum content vs. Mg#. Whole-rock SiO 2 contents of host tuff samples are shown in parentheses. Pressures (P) calculated with the barometers of Ridolfi
Journal Article
Journal: Economic Geology
Published: 01 August 2022
Economic Geology (2022) 117 (5): 1043–1071.
... and in rare cases biotite ( Fig. 6G, H ). In less altered samples, hornblende is preserved but commonly exhibits a patchy zoning pattern, caused by partial replacement by actinolite, evident as dark zones on BSE images ( Fig. 6I ) that correspond to zones low in aluminum ( Fig. 6J ). Fig. 6...
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Journal Article
Published: 01 December 2016
Mineralogical Magazine (2016) 80 (7): 1291–1314.
..., and ‘ T (B&H)’: temperature calculations and based on the amph-plag thermometer of Blundy and Holland (1990) for the TTG suite of the MCB. Values of Al (t) and Si are total aluminum and silica (apfu) in hornblende, whereas X-ab is the albitic component in the coexisting plagioclase. Values of P...
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Journal Article
Journal: Lithosphere
Publisher: GSW
Published: 01 October 2013
Lithosphere (2013) 5 (5): 521–536.
.... , 1997 , Regional tilt of the Mount Stuart Batholith, Washington, determined using aluminum-in-hornblende barometry: Implications for northward translation of Baja British Columbia : Geological Society of America Bulletin , v. 109 , p. 1225 – 1227 . Anderson J.L. Smith D.R. , 1995...
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Journal Article
Published: 01 July 2012
American Mineralogist (2012) 97 (7): 1129–1144.
... of contents for the specific volume/issue wanted, and then click on the deposit link there. References cited Ague J.J. ( 1997 ) Thermodynamic calculation of emplacement pressures for batholitic rocks, California: implications for the aluminium-in-hornblende barometer . Geology , 35 , 563...
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Representative amphibole grains. A. <span class="search-highlight">Hornblende</span> showing normal core-rim zoni...
Published: 01 August 2022
monzonite SID-16-12 (Collahuasi area). I. Backscattered electron (BSE) image of hornblende exhibiting irregular patchy zoning in SID-16-03 (Alantaya pluton). J. Aluminum X-ray map of the hornblende shown in I. Red areas are Al rich, black areas Al poor. Al-rich areas correlate with the light-colored zones
Journal Article
Published: 01 February 2005
Mineralogical Magazine (2005) 69 (1): 1–20.
.... , Robert , J.-L. and Jenkins , D.M. ( 2000 ) Short- range order in synthetic aluminous tremolites: an infrared and triple-quantum MAS NMR study . American Mineralogist , 85 , 1716 – 1724 . Jenkins , D.M. ( 1994 ) Experimental reversal of the aluminum content in tremolitic...
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Journal Article
Published: 01 June 1995
American Mineralogist (1995) 80 (5-6): 549–559.
... exchange has greatly influenced observed pressure variations. Data for other plutons also exhibit a marked positive correlation between temperature and hornblende pressure. If corrections are not made for temperature, such large apparent pressure variations can lead to overly high estimates of pluton...