 | | Journal (article/letter/editorial) | | deformation in the St. Brieuc region of the Neoproterozoic Cadomian orogen, northern France Elizabeth A. Nagy...the Neoproterozoic Cadomian orogeny in northern France, supracrustal rocks of the Brioverian Supergroup...zircon from selected plutons from the Baie de St. Brieuc region provide robust geochronological constraints...Latte quartz diorite and 574.6 + 1.8/−1.5 Ma for the late-tectonic St. Quay quartz diorite place limits...deformation of the Brioverian sequence in the Baie de St. Brieuc region. The new dates constrain the age of Brioverian |  | | Report (issue) | | The Cadomian Orogeny Revisited in Northern Brittany (France).................00204. E. Egal, C. Guerrot...an Active Plate Margin: North Armorican Massif, France..... R. A. Strachan, R. S. D’Lemos, and R. D. Dallmeyer...with southern Britain and the Armorican Massif of France to the east. In each of these regions, typically...documenting peri-Gondwanan terranes from Florida to France and, Vil Preface Vill finally, by several...The time-equivalent Cadomian rocks of northern France and the Channel Islands, although broadly similar |  | | Journal (article/letter/editorial) | | the shallow level of intrusion of the associated granites. Before the intrusion of the granitoids, the...They are formed by several rock types: gabbros, gabbro-diorites and mostly granodiorites. A detailed petrographic...is 287 + 8 Ma (Su~irez et al., 1978). The Tapia gabbro-diorites and granitoids enclose enclaves of different...Su;irez and Su;irez (1970). Legend." l=gabbro-dioritic rocks; 2 = biotite-hypersthenegranogabbros;3 = leucogabbros;...orthopyroxene, clinopyroxene, calcic plagioclase and biotite, quartz and amphibole being in a much lower proportion |  | Macera, P., Del Moro, A., Bargossi, G.M., Campana, R., Rottura, A. (1994) Polygenetic nature of the Cima d'Asta intrusive complex, Southern Alps, Italy. Inferences from petrological, geochemical and isotopic (Sr and Nd) data. Lithos, 32 (1) 47-62 doi:10.1016/0024-4937(94)90020-5 | Journal (article/letter/editorial) | | satellite mafic-intermediate masses of quartz norite-diorite to tonalitic composition. Both granitoids and mafic-intermediate...quartz norite-diorite, 2= hornblende-biotite-quartz diorite-tonalite, 3= hornblende-biotite tonalite, 4=biotite...4=biotite granodiorite, 5 = monzogranite, 6 = fine grained to porphyritic granite, 7=low-grade Hercynian...volumetrically dominant biotite monzogranites with minor hornblende-biotite tonalites and biotite granodiorites...tonalitic in composition and up to 40 cm in size, and biotite+hornblende clots occur in the granitoid rocks (Gandolfi |  | | Journal (article/letter/editorial) | | anticipated the occurrence of this last type of intrusion on the grounds that extensive ponding of basaltic...and events. Keywords: Magma mingling, granite, gabbro, net-veining, mafic-silicic layered intrusions...with granite, and some of these suggested that gabbro and granite were emplaced at nearly the same time...hybrid-looking rocks commonly occurred in other gabbro-granite associations, none were unambiguously interpreted...between gabbro and granite. Initially, nearly all studies suggested that silicic magma invaded gabbro, probably |  | | Journal (article/letter/editorial) | | Abstract Tectonized slices of foliated quartz-diorite/ quartz-gabbro rocks are exposed along the north Giudicarie...quartz crystal aggregates, green hornblende and biotite, has been observed mostly in the Rumo lamella.... 1976). These bodies consist of quartz-diorite, quartz-gabbro and minor tonalite (Morten, 1974; Morten...Systematic Rb/Sr geochronological analyses on biotite from the north-eastern part of the Adamello batholith...0 M a are reported by Borsi et al. (1972) for biotite from the Mauls and Samoclevo intrusive bodies, |  | | Journal (article/letter/editorial) | | Sup~rieure de G6ologie, BP 452, F-54001 Nancy C6dex, France 2 Laboratoire de P6trologie, Universit6 de Nancy...I, BP 239, F-54506 Vandoeuvre-16s-Nancy C6dex, France 3 Centre de Recherches P6trographiques et G~ochimiques...G~ochimiques BP 20, F-54501 Vandoeuvre-l~s-Nancy C+dex, France Centre de Recherche sur la Synth6se et Chimie des...Min6raux, rue de F6rollerie, F-45045 Orl6ans C6dex, France Abstract. The very fine-grained (-~ 1 gm) polygonal...rock powder. The physical state on and after intrusion was that of a melt and injection was followed |  | | Journal (article/letter/editorial) | | 1992) ABSTRACT The Pleasant Bay layered gabbro-diorite intrusion, located on the coast of Maine between...granite, the base of the intrusion typically consists of strongly chilled gabbro with convex-downward lobate...solidified when the gabbro was emplaced. Roughly 90% of the exposed rocks are weakly layered gabbro and mafic diorite...diorite, both of which vary widely in grain-size and texture. Layers and lenses of medium-grained leucocratic...leucocratic diorite to granodiorite are widely intercalated with the chilled mafic rocks and commonly contain |  | | Journal (article/letter/editorial) | | USA Small (<5 km2), lithologically diverse gabbro and diorite that mafic magmas present during the production...I-type bath- KEY WORDS; arc magmatism; Cascades; gabbro; granitoid; trace eltoliths, and represent basaltic...1992), but in general these marily from multiple intrusion of related magmas, in some have been extensively...are obscured (Eberz & ation (gabbronorite-quartz diorite) is modeled by low-pres- Nicholls, 1990). By comparison...study the petrotopic variation among LKS gabbro—quartz diorite at Copper genesis of mantle-derived magmas |  | | Journal (article/letter/editorial) | | the south and include two magmatic bodies: (a) Gabbro-pyroxene quartz monzodiorite-quartz monzodiorite...Type-II crops out in the west and has a gabbro – gabbro-diorite composition. Geochemically, Chargar intrusive...magmatism. Type-I intrusions and Type-II mafic intrusion were originated from mantle source with amphibole-bearing...intrusions range in composition from quartz monzo-gabbro to diorite, quartz monzodiorite, monzonite, quartz monzonite...Intrusions in the south of Chargar deposit consisting of gabbro, pyroxene quartz monzodiorite, quartz monzodiorite |  | Gahlan, Hisham A., Obeid, Mohamed A., Azer, Mokhles K., Asimow, Paul D. (2018) An example of post-collisional appinitic magmatism with an arc-like signature: the Wadi Nasb mafic intrusion, north Arabian–Nubian Shield, south Sinai, Egypt. International Geology Review, 60 (7) 865-888 doi:10.1080/00206814.2017.1360804 | Journal (article/letter/editorial) | | with an arc-like signature: the Wadi Nasb mafic intrusion, north Arabian–Nubian Shield, south Sinai, Egypt...with an arc-like signature: the Wadi Nasb mafic intrusion, north Arabian–Nubian Shield, south Sinai, Egypt...with an arc-like signature: the Wadi Nasb mafic intrusion, north Arabian–Nubian Shield, south Sinai, Egypt...present new data for the Neoproterozoic mafic intrusion exposed in Wadi Nasb, south Sinai, Egypt (northernmost... The Nasb mafic intrusion (NMI) intrudes metasediments, Rutig volcanics, and diorite/granodiorite, and |  | | Journal (article/letter/editorial) | | Keywords Iron oxide–apatite deposit . Porphyritic gabbro– diorite . Alteration zoning . Hydrothermal origin ...the iron oxide–apatite ore formation and the intrusion of associated subvolcanic rocks within Miner...associated with subvolcanic porphyritic gabbro–diorite and/or pyroxene diorite intrusions. In terms of their mineralogical...district and include porphyritic gabbro–diorite and/or pyroxene diorite intrusions that have zircon U–Pb...Nanshan deposits, and is hosted by porphyritic gabbro– diorite and adjacent volcanic rocks. The main mineral |  | | Journal (article/letter/editorial) | | Pascal, 5 Rue Kessler, F-63038 Clermont-Ferrand, France Received 23 June 1995; accepted 8 March 1996 ...with S7Sr-enriched fluids. Mafic rocks comprise biotite-amphibole diorites, quartz diorites and tonalites... Granitoids range from amphibole-biotite tonalites, through biotite granodiorites to monzonitic granites...peraluminous leucogranites which form an independent intrusion and were emplaced shortly after the calc-alkaline...rocks (Galen, 1987a,b) point to simultaneous intrusion of all them. 3. Petrology A brief account of |  | | Journal (article/letter/editorial) | | the Atud gold deposit hosted in the metagabbro–diorite complex of Gabal Atud (Central Eastern Desert,...classified as an intrusion-related gold deposit, in which the gabbro–diorite host intrusion acted as the...February 2017 1. Introduction Genesis of most intrusion related-gold deposits in the Eastern Desert of...its ore-bearing fluids and metal sources. The intrusion-related gold deposits (IRGDs) are the most important...related to calcalkaline to alkaline, intermediate (diorite–monzonite), and I-type intrusions ranges from Cu–Au |  | | Journal (article/letter/editorial) | | feldspathic garnet – mica schists and fine-grained biotite gneisses are abundant in the supracrustal belts...well as gabbro – dioritic bodies (Fig. 2B and C). The granite bodies include mainly biotite granites...metasedimentary rocks (barite quartzite) Chapada feldspathic biotite schist, sericite rich schist, gedrite – anthophyllite...volcano-exhalative environment. Aluminous quartz– biotite schists, probably the product of metamorphism of...comprising feldspathic quartzite, feldspathic biotite schist of probable tuffaceous origin, calc-alkaline |  | | Journal (article/letter/editorial) | | ORIGINAL PAPER Petrogenesis of the Nesryin gabbroic intrusion in SW Sinai, Egypt: new contributions from mineralogy...Springer-Verlag 2008 Abstract The Wadi Nesryin gabbroic intrusion is part of the Neoproterozoic Pan-African basement...of Egypt. The intrusion comprises hornblende gabbro, pyroxene–hornblende gabbro, diorite and appinitic...fine-grained gabbro and dolerite and belongs to what is known throughout Egypt as the “younger gabbro suite”...rock Rb–Sr isochron age of the Nesryin gabbroic intrusion is 617±19 Ma with initial 87Sr/86Sr=0.70322±0 |  | | Journal (article/letter/editorial) | | deposit is related to magnetite-series gabbro-diorite to tonalite intrusion. It contains prograde magnesian...associated with gabbro-diorite, and retrograde skarn with Cu mineralization, formed after intrusion of tonalite...quartz-muscovite-carbonate veins, formed after intrusion of late mafic quartz monzogabbro dikes, contain...Au deposits of various types including reduced intrusion-related Au and possibly orogenic Au deposits (Muruntau...metallogenic assemblage that comprises mostly reduced intrusion-related Au deposits (Jilau; Cole et al. 2000) |  | | Report (issue) | | Charlotte Belt (Fig. 1) is the main region of igneous intrusion (17). The country rock of the Charlotte Belt consists...and Mount Carmel diorite) are all considered to be post-metamorphic (17). Rb-Sr biotite ages on the Newberry...coarse-grained syenite ring dike enclosing a gabbro-diorite intrusion (both phases were sampled for this study)...ages on the diorite phase of the complex (23) imply a minimum age for the time of intrusion ofothis unit...ratio of 0.704) an aplite dike found cutting the diorite at about 303 Ma. Fig. 1. Schematic geologic setting |  | Zoheir, Basem, Emam, Ashraf, Abd El-Wahed, Mohamed, Soliman, Nehal (2019) Gold endowment in the evolution of the Allaqi-Heiani suture, Egypt: A synthesis of geological, structural, and space-borne imagery data. Ore Geology Reviews, 110. 102938 doi:10.1016/j.oregeorev.2019.102938 | Journal (article/letter/editorial) | | ophiolites, island arc rocks, and intrusive quartz-diorite and suggested that the accretion and suture formation...al., 2018b). Gneisses (i.e., garnet-biotite and hornblende-biotite gneisses) are less abundant, and commonly...K/Ar ages of coexisting hornblende (≈600 Ma) and biotite (≈585 Ma) are interpreted as cooling ages following...Wadi Seiga area, garnetbiotite and hornblende-biotite gneisses occur at the northern part of the map...ages of a quartz diorite intrusion in Wadi Um Ashira (709±4 Ma) and a gabbro intrusion east of G. Muqsim |  | | Journal (article/letter/editorial) | | cumulate products in the Pleasant Bay layered intrusion, coastal Maine Received: 17 January 1997 / Accepted:...layer in the Pleasant Bay ma®c-silicic layered intrusion. The compositions of olivine (Fo1 ) and plagioclase...endstage liquids related to the Skaergaard layered intrusion, and are consistent with recent experimental studies...chilled liquid and cumulate in the Pleasant Bay intrusion suggests that late stage liquids in tholeiitic...stages of fractionation in the Skaergaard layered intrusion (Hunter and Sparks 1987). These highly fractionated |  | | Journal (article/letter/editorial) | | were derived from asthenospheric upwelling. The gabbro-dioritic rocks with higher light to heavy REE ratios...serpentinized peridotite, cumulate pyroxenite, gabbro and SC R troctolite, diabase, basalt, plagiogranite...crystalline series are mainly composed of massive gabbro and diabase. NU The Kelameili ophiolite is composed...peridotite, serpentinite, MA cumulate pyroxenite and gabbro, diabase, olivine basalt, plagiogranite, basalt...include peralkaline granite, monzogranite, gabbro-diorite and diorite that tend to be elongate and trend NW-SE |  | | Report (chapter) | | significance of Neoarchaean variably alkali-enriched gabbro and diorite intrusions of the western Karelia Province...approached individually. Three Neoarchaean gabbro and diorite intrusions and two associated mafic dykes...Neoarchaean events is the widespread migmatization and intrusion of anatectic leucogranitoids at 2.7 Ga (Käpyaho...overprinting as evidenced by resetting of hornblende and biotite K– Ar ages (Kontinen et al. 1992) and variable...O-isotope ratios of zircons from the Änäkäinen intrusion were measured using Cameca IMS 1280 multi-collector |  | | Journal (article/letter/editorial) | | principal units with compositions ranging from gabbro to granite. Sr and O isotopic and major element...petrogenesis of the marie suite which ranges from gabbro to diorite. The entire complex appears to have been formed...indistinguishable from the initial ratio of the most primitive gabbro. Initial 87Sr/86Sr ratios and 5180 values for the...development of a cogenetic suite, the gabbro to diorite mafic intrusion of the Ascutney Mountain complex....Ascutney Mountain complex is an alkaline, multistage intrusion in eastern Vermont, just west of the Connecticut |  | | Journal (article/letter/editorial) | | two-pyroxene—biotite diorite and monzodiorite; (3) heterogeneous hornblende-rich rocks varying from gabbro to diorite;...diorite; (4) leucocratic rocks, chiefly consisting of biotite tonalite and granodiorite; and (5) late...field relations, suggest that the two-pyroxene-biotite diorite/monzodiorite unit was consanguineous with the...clinopyroxene-rich ultramafic and gabbroic rocks. The diorite/ monzodiorite unit, therefore, is an intermediate...rare-earth-element data characteristic of the diorite/monzodionte unit indicate strong similarities to |  | Gao, Lei, Liu, Shuwen, Sun, Guozheng, Guo, Rongrong, Hu, Yalu, Fu, Jinghao, Wang, Maojiang, Ma, Chenchen, Hu, Fangyang (2018) Petrogenesis of late Neoarchean high-K granitoids in the Western Shandong terrane, North China Craton, and their implications for crust-mantle interactions. Precambrian Research, 315. 138-161 doi:10.1016/j.precamres.2018.07.006 | Journal (article/letter/editorial) | | granodioritic gneisses (Group #3) and coarse-grained gabbro-diorites (Group #4). The first three groups of...A/NK versus A/CNK plot. In contrast, the gabbro and diorite samples display low SiO2 and K2O contents...3) were emplaced at ~2511-2497 Ma and that the gabbro-diorites were emplaced at ~2511 Ma. All of these...metagreywackes at lower to mid-crustal levels. The gabbro-diorites (Group #4) were derived from the partial...Martin et al., 2005, 2010; Wang et al., 2009a); (3) biotite- and two-mica granites formed by the melting of |
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