1-20 OF 70 RESULTS FOR

Zoisite-prehnite gabbro alteration

Results shown limited to content with bounding coordinates.
Follow your search
Access your saved searches in your account

Would you like to receive an alert when new items match your search?
Close Modal
Sort by
Journal Article
Published: 01 September 1942
American Mineralogist (1942) 27 (9): 638–645.
...Kenneth DeP. Watson Abstract Metagabbro in the vicinity of Baie Verte, Newfoundland, has been altered to an aggregate of zoisite and prehnite. Microscopic study shows zoisite intimately penetrated by a network of prehnite veinlets. Chemical analyses indicate a large increase in lime and decrease...
Journal Article
Published: 02 November 2022
Geological Magazine (2023) 160 (3): 444–470.
... and magnesiohornblende) and Fe-Ti oxide (magnetite-ulvöspinel) are late-stage crystallization products. The gabbro consists of plagioclase, augite and Fe-Ti oxide (Fig.  3 b, c). Gabbroic rocks of the KU mélange bear an omnipresent prehnite-pumpellyite to greenschist facies metamorphic overprint that produced...
FIGURES | View All (11)
Journal Article
Published: 01 June 2008
The Canadian Mineralogist (2008) 46 (3): 569–581.
... as alteration products of the primary clinopyroxene and plagioclase, respectively. Idioblastic clinozoisite and prehnite grow pseudomorphically at the expense of plagioclase grains. In some samples, veinlets filled with chlorite, prehnite and epidote cut the rodingite. The petrographic features of the Koziakas...
FIGURES | View All (6)
Journal Article
Published: 01 June 2010
The Canadian Mineralogist (2010) 48 (3): 629–650.
... associated with subsolidus alteration: albite, clinozoisite, white mica, actinolite, Nb-rich titanite, Ba-rich feldspars, harmotome, chabazite-Ca, armenite, chlorite, prehnite, and pumpellyite-(Al). Plagioclase, diopside, and zircon show trends (decreasing Ca/Na, Mg/Fe, and Zr/Hf from outer to inner units...
FIGURES | View All (7)
Journal Article
Published: 02 January 2004
Reviews in Mineralogy and Geochemistry (2004) 56 (1): 171–195.
...: phase Pi; qz: quartz; pre: prehnite; top-OH: topaz-OH; v: vapor; zo: zoisite. The relatively low pressure, central portion of the phase diagram (Fig. 2 ) is strongly constrained by the location of the upper pressure stability limit of anorthite + vapor through the equilibrium (the high...
FIGURES | View All (14)
Journal Article
Published: 02 January 2004
Reviews in Mineralogy and Geochemistry (2004) 56 (1): 197–234.
... ( Spear 1993 ): (18) \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \[prehnite\ +\ calcite\ =\ lawsonite\ +\ zoisite\ +\ H_{2}O\ +\ CO_{2}.\] \end{document} The transition...
FIGURES | View All (10)
Journal Article
Published: 01 September 2016
The Canadian Mineralogist (2016) 54 (5): 1129–1146.
..., and a very fine-grained mixture of epidote, clinozoisite, zoisite, thomsonite, paragonite, prehnite, and minerals of the smectite group. Tasáryová et al . (2014) reported slawsonite in altered picrite in the Barrandien of central Bohemia, where the slawsonite forms part of an interstitial phase along...
FIGURES | View All (9)
Journal Article
Published: 01 January 2008
Exploration and Mining Geology (2008) 17 (1-2): 51–66.
... evidence of silica addition during deformation. Consequently, the high quartz content of these mylonites should not be taken as a primary feature of the protolith. Feldspar and its alteration products, namely zoisite, epidote, and ‘sericite’ or white mica aggregates, are not common. This would imply...
FIGURES | View All (11)
Journal Article
Published: 01 June 2017
Geochemistry: Exploration, Environment, Analysis (2017) 17 (4): 315–333.
..., preventing spatially extensive mapping. Laboratory measurements (FTIR, XRD, EPMA) successfully characterize pure representatives of three calc-silicate mineral groups – epidote, pumpellyite, and prehnite – as well as mixed mineral samples from the Fortescue Group volcanics, Hamersley Basin, Western Australia...
FIGURES | View All (11)
Journal Article
Published: 01 July 2017
The Canadian Mineralogist (2017) 55 (4): 763–786.
.... The quartz-zoisite O-isotopic thermometer indicates a temperature of formation for zoisite between 385 and 448 °C. The sulfur isotopic composition of pyrite (between –7.8 and –1.3‰ V-CDT) associated with tsavorite in the Lelatema fold belt deposits suggests the contribution of reduced marine sulfate...
FIGURES | View All (10)
Journal Article
Published: 01 April 1989
Journal of the Geological Society (1989) 146 (2): 353–356.
... diagenetic-zone alteration while adjacent metabasites have assemblages of prehnite- pumpellyite facies. The higher grade imprint in the latter was ascribed to their higher primary porosity, facilitating infiltration of comparatively hot deep-seated fluids. B. W. D . Yardley (in a joint paper with C. Katagas...
Journal Article
Published: 01 February 2002
Mineralogical Magazine (2002) 66 (1): 93–119.
... that while prograde dehydration reactions and eclogitization resulted in a 90% loss of fluid from hydrothermally altered gabbros of the Monviso ophiolite complex, the remaining 10% of fluid was probably stored in primary water-rich fluid inclusions in megacrystic omphacite and vein omphacite...
FIGURES | View All (7)
Journal Article
Published: 02 January 2004
Reviews in Mineralogy and Geochemistry (2004) 56 (1): 347–398.
... zoisite belongs to the peak stage assemblage whereas epidote is a retrograde phase in both the barroisite-bearing and rutile-rich Fe-Ti eclogites. The coherent layering of the eclogitic rocks suggests a cumulate origin with anorthositic plagioclase to olivine-rich gabbro cumulate as the protolith...
FIGURES | View All (33)
Journal Article
Published: 01 July 2002
The Journal of Geology (2002) 110 (4): 371–391.
... sheeted dikes. The dikes contain aphyric to sparsely plagioclase- or clinopyroxene-phyric altered diabase, with gabbro and lava screens in the lower and upper contact zones (MacLeod and Rothery 1992 ). Most plutonic rocks show little alteration, but the high-level intrusives have undergone ocean...
FIGURES | View All (9)
Journal Article
Published: 02 January 2004
Reviews in Mineralogy and Geochemistry (2004) 56 (1): 235–300.
..., and wairakite is most abundant above the epidote zone but does occur with prehnite in epidote-altered rocks. During the initial opening of a shallow production hole (well 4, 1448 m deep), located to the southeast of well WD-1a in Figure 4 , large amounts of chips of hydrothermal minerals were ejected...
FIGURES | View All (25)
Journal Article
Published: 01 June 2001
South African Journal of Geology (2001) 104 (2): 167–204.
..., has been subdivided into a Lower Division consisting of serpentinized dunites and orthopyroxenites and an Upper Division comprising altered dunites, harzburgites, lherzolites, wehrlites, websterites, gabbro-norites and anorthositic gabbros. A zone of Ca-metasomatised gabbros and associated rodingite...
FIGURES | View All (17)
Journal Article
Journal: Economic Geology
Published: 01 May 2004
Economic Geology (2004) 99 (3): 453–478.
... ). Late-stage zoisite and prehnite are minor phases. As the garnet in this assemblage contains a grossular component (12 mol %), pressure is constrained by the following anorthite-consuming reactions: \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts...
FIGURES | View All (23)
Journal Article
Journal: Economic Geology
Published: 01 November 2005
Economic Geology (2005) 100 (7): 1349–1361.
... on the absence of prehnite and pumpellyite, plus the presence of partially serpentinized olivine and highly altered pyroxene, a temperature range between 275° and 400°C appears to be reasonable for the pervasive alteration in the Jinchuan area. Mineralogical alteration at Jinchuan is mainly controlled...
FIGURES | View All (9)
Journal Article
Published: 01 May 2013
American Mineralogist (2013) 98 (5-6): 955–965.
... by the infiltration of an external aqueous fluid from the neighboring lithologies. This second alteration stage essentially resulted in the hydration and breakdown of plagioclase to epidote, thomsonite, and variable amounts of zoisite, clinozoisite, prehnite, sphene, smectite, calcite, paragonite, and Sr-feldspar...
FIGURES | View All (6)
Journal Article
Journal: Lithosphere
Publisher: GSW
Published: 09 March 2022
Lithosphere (2022) 2022 (1): 9507697.
..., which has been affected by blackwall alteration (Kimi region). (b) Rodingite dike intruding serpentinized peridotite in the region of Kimi. (c, d) Rodingite dike intruding serpentinized peridotite in the Pagondas region. (e) Partially rodingitized (locally coarse-grained) gabbro intruding serpentinized...
FIGURES | View All (10)