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Petrology of orthoamphibole-cordierite gneisses from …
ture. Quartz, orthoamphibole, and biotite are intergrown SCHNEIDERMAN AND TRACY: ORTHOAMPHIBOLE-CORDIERITE in the porphyroblasts. Orthoamphibole, most commonly anthophyllite and more rarely gedrite, occurs intergrown with cummingtonite and is observed on the weathered surface as long prismatic blades or as fanlike bunches. At
Whiteschists and orthoamphibole-cordierite rocks and the …
This paper describes the second known occurrence of whiteschist from Norway. Whiteschists and orthoamphibole-cordierite rocks, which can both be described in the M (F) ASH system, are found in the Modum Complex together with albitites in contact zones between metagabbros and supracrustals. They are formed due to extensive hydrothermal activity. Bulk rock and mineral …
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(PDF) Witwatersrand iron-formations and their significance …
Formation of orthoamphibole As predicted by Robinson et al. (1982), the first appearance of orthoamphibole should occur in rocks that are very low in Ca. No Ca-bearing phase is present in the orthoamphibole-bearing rocks investigated. The orthoamphiboles are in textural Witwatersrand iron-formations and their significance for gold genesis 287 ...
Prolonged metamorphism of garnet-orthoamphibole
Semantic Scholar extracted view of "Prolonged metamorphism of garnet-orthoamphibole gneisses from the Fuyun area: New insights into metamorphic evolution of the southern Chinese Altai orogen" by Zhao Liu et al.
Metamorphic evolution of sapphirine- and …
USA, orthoamphibole-cordierite gneiss is one of the few lithologies with assemblages suitable for deter-mining metamorphic conditions. However, the deter-
Prolonged metamorphism of garnet-orthoamphibole gneisses …
Garnet–orthoamphibole gneisses (GOG) represent a metamorphic lithology originated from hydrothermally altered metasediments or metabasites, and usually comprise low–variance mineral assemblages and are suitable to recover the P–T trajectory.In this study, we firstly report the occurrence of the GOG in the southern Chinese Altai orogen, NW China.
Chapter 1, Phase relations of metamorphic amphiboles; …
John C. Schumacher; Chapter 1, Phase relations of metamorphic amphiboles; natural occurrence and theory; Orthoamphibole and cummingtonite amphibolites; phase relations; medium-grade assemblages. Reviews in Mineralogy and Geochemistry 1982;; 9B (1): 171–173. doi:
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Figure 5. Metamorphic P-T paths for garnet orthoamphibole rocks and garnet amphibolites from the south Hengshan complex; Figure 6. Metamorphic and deformation characteristics of the Zhujiafang shear belt; Figure 7. Field characteristics and garnet zoning of garnet mica schists and garnet amphibolites in the Jingangku Formation
Paleoproterozoic (2.01 Ga) granulite facies metamorphism
Paleoproterozoic (2.01 Ga) granulite facies metamorphism and isothermal decompression of garnet–orthopyroxene-cordierite–orthoamphibole gneisses from the Phikwe Complex of the Limpopo Belt ...
Long length scales of element transport during reaction …
The progressive growth of complex corona structures on garnet and Al2SiO5 porphyroblasts in orthoamphibole-cordierite gneiss Thor-Odin dome (British Columbia, Canada) reduced the EBC volume of the rock during metamorphism and therefore had a dramatic effect on the evolution of the stable mineral assemblage. These rocks contain a chemical and ...
Paleoproterozoic (2.01 Ga) high-pressure granulite
In this study, we present SHRIMP U Pb zircon ages for a charnockite from the Phikwe Complex and a garnet-orthopyroxene-cordierite-orthoamphibole (Grt-Opx-Crd-Oam) gneiss from a near-by locality in the Baines Drift Complex (Fig. 2; mineral abbreviations from Whitney and Evans, 2010).The P-T-t evolution of the Grt-Opx-Crd-Oam gneiss that comprises …
Prolonged metamorphism of garnet-orthoamphibole …
Garnet–orthoamphibole gneisses (GOG) represent a metamorphic lithology originated from hydrothermally altered metasediments or metabasites, and usually comprise low–variance mineral ...
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On ammonium in upper-amphibolite facies cordierite-orthoamphibole …
NH 4 + values of 1100-3000 ppm and 250-458 ppm have been measured in biotites and whole rock samples respectively, from cordierite-orthoamphibole-bearing rocks at Rod, Bamble Sector, south Norway. The results indicate that given: (a) suitable (Mg, Fe, Al)-rich and (Ca, Na)-poor bulk compositions, (b) no high-grade (breakdown-)reactions involving biotite, (c) reducing conditions …
Chemistry and phase petrology of amphiboles and …
Ionic substitution within the orthoamphibole series was dominated by the Mg-tschermakitic and edenitic exchange reactions. The amphibolites are thought to have been subjected to …
Metamorphic evolution and Zircon ages of Garnet–orthoamphibole …
DOI: 10.1016/J.PRECAMRES.2014.11.013 Corpus ID: 129367849; Metamorphic evolution and Zircon ages of Garnet–orthoamphibole rocks in southern Hengshan, North China Craton: Insights into the regional Paleoproterozoic P–T–t history
The Cordierite-orthoamphibole Rocks of the Variscan Dome …
The cordierite-orthoamphibole enclave records a succession of metamorphic reactions: (1) local Crd-Oam growth at the expense of Bt with release of K 2 O; (2) development of coronas of Crd ± Ilm ± Grt around St; (3) isochemical breakdown of St to Crd + Spl + Crn. In the Ged-bearing layers in interlayered migmatites, the formation of the Crd ...
Mg-rich dumortierite in cordierite-orthoamphibole-bearing …
The development of dumortierite from orthoamphibole correlates with an observed decrease of Al, Mg and Na and increase of Si and Fe in orthoamphibole towards dumortierite. Keywords. Bamble Sector south Norway cordierite Mg-rich dumortierite …
Orthoamphibole – Chlorite schists from the Little Pine …
The Little Pine Garnet Mine area in the Western part of the Blue Ridge, southern Appalachian Mountains has outcrops of gedrite - anthophyllite – chlor…
Exsolution of Hornblende and the Solubility Limits of …
Analytical electron microscopy data suggests that calcium has a low solubility limit in the orthoamphibole structure. The hornblende lamellae range from only a few unit cells in thickness to about 80 nanometers. The formation of the calcic amphibole lamellae resulted from heterogeneous nucleation and growth along pre-existing (100) stacking faults.
Metamorphic evolution of sapphirine‐ and orthoamphibole…
In contrast to orthoamphibole-cordierite gneiss in the other Cordilleran domes, the Tunk Creek unit occurs as a discontinuous km-scale layer rather than as smaller (m-scale) pods, is more calcic, and lacks garnet. In addition, kyanite did not transform to sillimanite, and spinel commonly occurs as a blocky matrix phase in addition to vermicules ...
Chemistry and microstructure of orthoamphiboles from …
Orthoamphibole chemistry. Representative ana- lyses of orthoamphiboles from the present rocks (Table I) reinforce the graphical impression of fig. 1 that there is a continuous gradation through the orthoamphibole solid solution series. All iron is listed as Fe 2 +. A plot of tetrahedral A1 vs. Na
Chemistry and phase petrology of amphiboles and orthoamphibole …
Ionic substitution within the orthoamphibole series was dominated by the Mg-tschermakitic and edenitic exchange reactions. The amphibolites are thought to have been subjected to metamorphic temperatures above the orthoamphibole solvus during both the Proterozoic and the Cretaceous. Cretaceous metamorphism was followed closely by rapid …
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Geochemistry, mineralogy, and metamorphic history of …
Photomicrograph of corroded kyanite (ky) pseudomorphed by plagioclase (p), chlorite (c), and quartz (q) in kyanite-orthoamphibole hornblendite OU69827, Crouching Tiger Flume.
Geochemistry and origin of cordierite-orthoamphibole …
Cordierite-orthoamphibole rocks are characterized by the presence of orthoamphiboles (anthophyllite and gedrite) with Al-rich phases, particularly cordierite (and A12SiO5 phases, garnet, and staurolite), and other minerals, including biotite, plagioclase, cummington- ite, chlorite, quartz or corundum, spinel, talc, Fe-Ti 74 Y. Pan, M.E. Fleet ...
Orthoamphibole | Traductor inglés español
Traduce orthoamphibole. Ver traducciones en inglés y español con pronunciaciones de audio, ejemplos y traducciones palabra por palabra.
Paleoproterozoic (2.01 Ga) high-pressure granulite facies …
In this study, we present SHRIMP U Pb zircon ages for a charnockite from the Phikwe Complex and a garnet-orthopyroxene-cordierite-orthoamphibole (Grt-Opx-Crd-Oam) gneiss from a near-by locality in the Baines Drift Complex (Fig. 2; mineral abbreviations from Whitney and Evans, 2010). The P-T-t evolution of the Grt-Opx-Crd-Oam gneiss that comprises …