... is very low in the top layers but high (around 15%) in the bottom part of the cemented mass. At 400 °C, the reaction turnover was only 51% as olivine was stable after plagioclase had reacted away. Clinopyroxene and andradite ± chlorite had formed in the top layers, whereas xonotlite, grossular...

... detection analysis (ERDA), secondary ion mass spectrometry (SIMS), and electron probe microanalysis (EPMA) to measure H and F concentrations and constrain incorporation mechanisms in ten grossular garnets. We also present SIMS data for 11 spessartine and two andradite garnets. Three grossular garnets were...

... minerals (such as members of the brownmillerite-srebrodolskite series, fluormayenite, lakargiite, baghdadite, hematite, sphalerite, zincite, garnet of the andradite-grossular series, tululite, vapnikite, minerals of the lime-monteponite series and members of the magnesiochromite-zincochromite series...

...Charles A. Geiger; George R. Rossman Abstract The nominally anhydrous, calcium-silicate garnets, grossular (Ca 3 Al 2 Si 3 O 12 ), andradite (Ca 3 Fe 2 3 + Si 3 O 12 ), schorlomite (Ca 3 Ti 2 4 + [Si, Fe 2 3 + ]O 12 ), and their solid solutions can incorporate structural OH - , often termed “water...

...Charles A. Geiger; George R. Rossman Abstract The calcium-silicate garnets, grossular (Ca 3 Al 2 Si 3 O 12 ), andradite (Ca 3 Fe 2 3 + Si 3 O 12 ), and their solid solutions [Ca 3 (Al x , Fe 1 − x 3 + ) 2 Si 3 O 12 ], can incorporate various amounts of structural OH – . This has important...

...Xianghui Fei; Zhaochong Zhang; Zhiguo Cheng; M. Santosh Abstract The grossular-andradite solid solutions in garnet from skarn deposits in relation to hydrothermal processes and physicochemical conditions of ore formation remain controversial. Here we investigate garnet occurring in association...

... SiO 4 ], and the garnet series, grossular-andradite [Ca 3 (Al x , Fe 1 − x 3 + ) 2 Si 3 O 12 ], grossular-spessartine [(Ca x , Mn 1 − x 2 + ) 3 Al 2 Si 3 O 12 ], and almandine-spessartine [ ( Fe x 2 + , Mn 1 − x 2 + ) 3 Al 2 Si 3 O 12 ]. Local magnetic behavior of the transition-metal-bearing end...

...- or andradite-grossular solid solution (Ad 68- Ad 72 )–stable assemblages representative of calcic alteration typically occur in deep and/or distal positions but are less commonly exposed. The sodic-calcic and sodic alteration types, however, occur more proximally to the porphyry orebody. Sodic-calcic...

...Edgar Dachs; Charles A. Geiger The thermodynamic behaviour of three synthetic, Ca 3 (Al 0.25 Fe 0.75 3 + ) 2 Si 3 O 12 , Ca 3 (Al 0.50 Fe 0.50 3 + ) 2 Si 3 O 12 and Ca 3 (Al 0.75 Fe 0.25 3 + ) 2 Si 3 O 12 and three grossular-rich natural solid-solution garnets were investigated. Synthetic garnets...

... in the pyrope-rich garnets. Intermediate garnet compositions are more depleted in HREE and enriched in LREE (Ce, Nd, and Sm). Finally, Ca-rich garnets (50% grossular component) are depleted in LREE and HREE, but are enriched in MREE. Hence, the X site dimension does exert a crucial role in REE incorporation...

..., 2018 ). Pegmatites range in thickness between 0.5 and 30 m, and very limited data show the garnets to be Fe-Mg rich and grossular poor ( Wallace, 1974 ) ( Fig. 4B ). Northern Fiordland: Northern Fiordland, 80 km south of Jacksons Bay ( Fig. 2 ), hosts large bodies of garnet-bearing...

... and gehlenite (±rankinite, bredigite); T ≥ 750 °C (spurrite); T ≥ 700 °C (tilleyite, wollastonite, and melilite (Gehl <50 )); and ~500–550 °C (diopside, amphibole, and grossular). Very high temperatures at the contact ( T cont > 2/3 T melt ) result from magma flow along a conduit. The temperature profiles...

...Chi Ma; John R. Beckett Abstract Nuwaite (Ni 6 GeS 2 , IMA 2013-018) and butianite (Ni 6 SnS 2 , IMA 2016-028) are two new chalcogenide minerals, occurring as micrometer-sized crystals with grossular, Na-bearing melilite, heazlewoodite, and Ge-bearing Ni-Fe alloys in veins and as mono-mineralic...

... property behavior. Three issues are: i) Could there be differences in the thermodynamic properties, namely heat capacity, C p , between synthetic and natural andradite crystals, as observed in the Ca-garnet grossular, Ca 3 Al 2 Si 3 O 12 ? ii) What is the thermal nature of the low-temperature magnetic...

... and volcaniclastic sediments in response to Oligo-Miocene intrusion by granitoid porphyries. The KSD contains abundant oscillatory-zoned garnet crystals, which are characterized by isotropic cores of nearly pure andradite that are rimmed by anisotropic grossular–andradite (grandite). The Fe-rich andraditic cores...

... is weaker in our previous study of pyrope-rich solutions (i.e., Py 80 Gr 20 , Du et al. 2016 ) because excess volume varies little from Ca-Ca S3NN pairings in pyrope-rich solutions, whereas Mg-Mg S3NN pairings in grossular-rich solutions studied here are effective at reducing excess volume. Heating to 600...

... and Kenya. The gem-quality green vanadium-rich grossular is only mined in southern Madagascar (Vohibory), south-eastern Tanzania (Ruangwa and Tunduru, Fig. 1 a), north-eastern Tanzania (Lelatema fold belt and Kalalani), and south-eastern Kenya from Mgama Ridge to Ngomet ( Fig. 1 b). The alignment of mines...

... November 2016 20 May 2017 © 2017 Mineralogical Association of Canada 2017 Neoproterozoic Metamorphic Mozambique Belt tsavorite tanzanite Sm/Nd dating Sr-O-S-isotopes fluid inclusion origin of the fluids World-famous deposits of both vanadium-bearing green grossular garnet...

.... We report on understated but widespread mineral assemblages present in the DTZ at the top of a mantle diapir (Oman ophiolite), including pargasite, grossular, and pyroxenes of peculiar composition. These minerals are present interstitially between olivines and as inclusions in the disseminated...