 | | Journal (article/letter/editorial) |
| Geologia dell'Universitgt di Firenze, Florence (Italy) (Received August 1, 1968) SUMMARY Magmatic activity...not known. The Jurassic ophiolites (serpentinite, gabbro and diabase) were repeatedly moved westward by...(rhyolites to latites), and ignimbrites are known in Tuscany, and pyroclastics are predominant in northern Latium;...(Capraia Island) are Upper Miocene; in southwest Tuscany near the coast (Campiglia, Gavorrano, Roccastrada)...granitite with no potash feldspar (Poggio Caprone, Livorno). The alkaline granites of the olistostromes are |
 | | Journal (article/letter/editorial) |
| JE~vls, Esq., F.G.S. [Abstract.] TIIE geology of Tuscany is peculiarly interesting, though presenting many...then first upheaved the littoral of Piedmont and Tuscany, where they formed the eastern barrier of the Maremme...chain of the Apennines. Throughout the whole of Italy, the lithelogical appearance of each successive...form a very dense rock, with large crystals of diallage and milk-white or slightly steel-grey crystals...in part by steatite--as at Impruneta, whero the diallage is easily cleaved by the nail : this is fawn-eoloured |
 | | Book (chapter) |
| relative position of the Serpentines (Ophiolites), Diallage Rocks (Euphotides), Jasper9 8$c. in some parts...(ophiolites), or rocks with a serpentine base, diallage rocks, and even jaspers ; notwithstanding the...Asbestiferous greenish serpentine, brown serpentine with diallage, and common serpentine. Throughout the whole valley...to Inurea^ &c. b. Diallage rock (Euphotide of Hatiy, Granitone of the Italians, Gabbro of M. von Buch)...felspar, of greenish serpentine, of schiller spar (diallage metalloide), and sometimes perhaps of quartz. |
 | | Book (chapter) |
| On Gabbro (Euphotide of Hauy)* By M. Von BUCH. Extracted by M. de BONNARt>. (Annales des Mines for 1816...by M. Leopold von Buchj upon the rock formed of diallage, united with either jade or felspar^ or with both...substances, a rock to which he assigns the name of Gabbro, given it by the Florentines. In the vii volume...a supplementary notice to his first memoir. The gabbro, spread over the four quarters of the world, forming...mineralogists have thought that smaragdite or diallage ought also * Diallage Rock. (Trans.) Downloaded from https://www |
 | | Journal (article/letter/editorial) |
| Ciminite, named from its occurrence on Monti Cimini, Italy, was defined2as consisting of alkali feldspar, basic...granodiorite (229). (23IO) Quartz-gabbro. Quartz-olivine-gabbro. Quartz-basalt. Quartz-olivine-basalt...t, monzogabbro. (2315) Gabbro voN BUCH. The term gabbro (granito di gabbro)was used by TargioniTozzetti4and...otherwritersfor diallageserpentine and related rocks from Tuscany. Von BuchSapplied 1Henry S. Washington, "The Roman...1768), II, 432. s Leopold von Buch, "Ueber den Gabbro" (read in Akad. d. Wissens., Berlin, October 12 |
 | | Report (volume) |
| Introduction 3 9 Summary 3 11 CHAP. I. The limits of the gabbro area near Baltimore and the general char13 acter...description of the hypersthene-gabbro 3 18 III. Petrographical description of the gabbro-diorite 3 27 34 IV. Genetic...the hypersthene-gabbro and the gabbro-diorite.3 1. Geological relations of the gabbro and diorite to each...relations of the gabbro and diorite 3 37 40 3. Microscopical relations of the gabbro and diorite 3 45... General conclusions 3 V. The olivine-bronzite-gabbro, peridotites, and associated serpentines and amphibole |
 | | Journal (article/letter/editorial) |
| 292 John Parkinson—Gabbro of Pegli, N. Italy. It has not so well developed a cingulura as have typical...natural size. II.—THE GLAUCOPHANE GABBRO OF P E G L I , NORTH ITALY. By JOHN PAKKINSON, F.G.S. (PLATE...incidentally the occurrence of glaucophane in the gabbro associated with these rocks at Pegli, a village...village and in its neighbourhood, when I found the gabbro in some abundance, in consequence, as I think,... 2. x about 75 times. Glaucophane Gabbro of Pegli, North Italy. Downloaded from https://www.cambridge |
 | | Journal (article/letter/editorial) |
| products of mineral alteration. The rocks now known as gabbro are quite well characterized by peculiarities that...Superior THE BASIC MASSIVE ROCKS, ETC. 435 province, which the writer desires to make as opportunities...At about the same time the names Euphotide and Gabbro were applied, respectively by Haüy' in France and...Euphotides as consisting of a compact feldspar and diallage, for which combination he constructed the name...hand-specimens from many localities. Von Buch's name, gabbro, was adopted from the Florentines3 to cover a group |
 | | Journal (article/letter/editorial) |
| characters which are admitted to be distinctive of a gabbro, steadfastly refuse to call it by that name. In...therefore insisted upon that the differences between gabbro and tachylyte on the one hand, and between granite...other districts, such as the Auvergne, Bohemia, or Italy, we shall find t h a t there are groups of characters...e d in the same petrographical province* This petrographical province was one of vast extent. From Iceland...rocks of" the ]3rite-Icelandic petrographical province are seen to exhibit the most striking resemblances |
 | | Report (issue) |
| . . . . 20 Coronite troctolite 23 Olivine gabbro 29 Wehrlite . . 31 Orthoamphibolite 33 Veins... 13. Opaque minerals in troctolite and olivine gabbro . 27 14. Photomicrograph of a corona . . . ....Photomicrograph of olivine gabbro 31 18. Photograph of a large diallage crystal 32 19. Photomicrograph...38 olivine gabbro 22. Photomicrograph of amphibolite . 39 23. Photograph of a diallage-plagioclase...by olivine gabbro. Outwards, towards the margin of the sill, troctolite and olivine gabbro show a progressive |
 | | Journal (article/letter/editorial) |
| and SC Technology, Shenzhen 518055, Guangdong Province, China yjjchina5188@163.com; First author,...Silurian gabbroic rocks comprise troctolite, olivine gabbro, and leucogabbro enclosed by Early Permian diorites...support from incompatible trace elements in olivine gabbro and leucogabbro, which display enrichment in large...hydrous basaltic magmas with a former arc olivine-diallage matrix which suggests multiple arc basaltic magmatism...comprise MA ultramafic rocks and evolved hornblende gabbro resulting from differentiation of a basaltic magma |
 | | Journal (article/letter/editorial) |
| 1889. . n i H E Eocene eruptive rocks of Northern Italy have already acquired _l a somewhat extensive literature...harzburgite " (Kosenbusch). The occasional presence of diallage as at Levanto (Bonney), and at Pria Borgheise...approach to lherzolite; but the author regards the diallage in these cases as always accessory, and hence...view based on superficial resemblances ; (2) from diallage, as urged by Berwerth for that of Eosignano, in...Apennines. mistaken the bastite and enstatite for diallage; (3) from enstatite or other pyroxene in cases |
 | | Journal (article/letter/editorial) |
| composed of fragments of serpentine, with some of gabbro, and a few of a dark slaty rock in an ashy-looking...the field to come to a positive conclusion. The gabbro is probably the latest rock, being intrusive in...next two headlands to the west mainly consist of gabbro. This rock varies from a fine-grained variety of...saussuritic mineral and a dark green or almost black diallage or augite. The latter rock much resembles some...aspect. I have examined a slide of the more compact gabbro. At a glance it is seen to have been highly altered |
 | | Journal (article/letter/editorial) |
| quantity in the black copper ores of the Spanish province of Leon. It occurs also ia iron ores and innumerous...composed of saussuritic labradorite, grey or green diallage, some magnetic iron, and pyrites. The labradorite...serpentine, hornblende schists, and zobtenite (veined gabbro) occurs also in Saxon gmuulite. This interlacing...saussuritic labradorite with coarse grossularite, diallage, and titanic iron. At Frankenstein, fine and coarse-grained...Norway, is composed of plagioclase, sea-green diallage, hy pers then e, green horn ble ri de, apatite |
 | | Report (issue) |
| ........................................... .. Gabbro ........................................................................................... .. Diallage ............................................................................................ . GABBRO .......................................................................... .. Iron ore mined in gabbro ............................................................................................ . Diallage ......................................... ... |
 | | Journal (article/letter/editorial) |
| olivine gabbro and massive saxonite serpentine and dunite serpentine- Dunite intrudes olivine gabbro; saxonite...lies in saxonite near its contact with olivine gabbro. The largest body is roughly oval and lies slightly...associated dunite, melano-troctolite, and olivine gabbro. Dense ore forms most of the deposit as well as...gangue, partly dunite serpentine and partly olivine gabbro. The chromite is fractured and in places anisotropic...corroded in contact with the silicates. Olivine gabbro gangue shows microscopic zonal distribution of |
 | | Report (volume) |
| . Hypersthene-gabbro .......................... .............................. Gabbro-diorite ........................................ 7 8 10 15 18 Gabbro-grauite.............................................................. The Iron Hill gabbros and gabbro-diorites................................... Diorite...transformations....................................... Gabbro-diorite and hornblende-gneiss.............................................................. The gabbro belt.......................................... |
 | | Journal (article/letter/editorial) |
| PERIPHERAL PHASES OF NORTHEASTERN THE GREAT GABBRO MASS IN MINNESOTA.1 C. The Granulitic Gabbros...great mass of the normal The gabbro, viz., magnetite, olivine, diallage and plagioclase. is in marked...of the components is absent it is usually the diallage. In the granulitic phase, olivine is more frequently...granulitic gabbros than among those with the true gabbro structure. Another quite widely spread constituent...north limit of the gabbro area, and not far north of localities where the normal gabbro occurs in its usual |
 | | Journal (article/letter/editorial) |
| ROCKS OF THE LAKE SUPERIOR REGION. III. THE GREAT GABBRO MASS OF NORTH-EASTERN MINNESOTA.' A. Introduction...are associated. B. The Position of the Gabbro. The great gabbro mass which is the subject of this paper...Keweenawan series is closely linked with "the great gabbro flow," to which reference will be made hereafter...p. 3) the same writer discusses the age of the gabbro and concludes that it is much older than the Potsdam...miles east of Fond du Lac. A second' area of basal gabbro is in the Bad River region in Here the rock forms |
 | | Journal (article/letter/editorial) |
| ............................. Ilmenite-apatite gabbro..................................................of Cambro-Ordovician rocks of the Great Valley province. The basal member of this series is a quartzite...by the writers as the Blue Eidge petrographic province, shows certain important differences in mineralogy...Ridge igneous complex of the larger Blue Ridge province. Q u a r t z - b e a r in g H y p e r s t h e...forms a part of the larger Blue Ridge petrographic province, contain as the dominant feldspar a calcic andesine |
 | | Journal (article/letter/editorial) |
| west is formed.partly of igneous rocks—such as gabbro, greenstone, serpentine,'-&hd granite—and partly...time to add one or two from my own observation. Gabbro occupies an area of six or seven square miles in...greenstone " or " epidiorite " associated with the gabbro increases towards the north until it exceeds that...the latter rock. Although the junctions of the gabbro and the greenstone are perfectly sharp, it is impossible...on the Survey Map, consists for the most part of gabbro in which veins and dykes of greenstone are very |
 | | Journal (article/letter/editorial) |
| hand, and apparentlyinto the differenttypes of gabbro,on the other. Severaldioritedikes occur cutting...Quarry Hill, showing diorite dikes in pyroxenite, gabbro, two sets: an older set of five nearly vertical...displacementin no case exceedsa few feet. Pyroxenite,gabbro, and serpentinefill the space between the dikes...which may FIG. 2.-Banded structure in olivine gabbro-Quarry pyroxenite and norite. Hill-common also... They range from a typical olivine gabbro to a hypersthene gabbro. There is no evidence of intrusion |
 | | Journal (article/letter/editorial) |
| Websterite. The occurrence of a similar rock in Northern Italy seems worth recording. Our specimens were collected...coarsely crystalline aggregate of lustrous black diallage, in which the rhombic pyroxene which forms the...[1086] shows the rock to consist of large plates of diallage moulding smaller grains of hypersthene, neither...nearly colourless ; diallage is in colourless, irregular plates, often slightly...occurs rarely, in small scraps, intergrown with the diallage near its contact with the hypersthene. There is |
 | | Journal (article/letter/editorial) |
| the ~reater part of the mountain is eoloured as gabbro, and the same rock forms a small peak near the...Arolla glacier) where, according to the map, the gabbro can be seen in situ, in contact with the gneissoid...covered up the junction. Hence my examination of the gabbro has been confined to the specimens which are brought...about 1,, long, of a pyroxenie mineral, augite or diallage, of rather dull non-metallic lustre. The other...rock sometimes occur : and in these may be seen diallage crystals, an inch or so in diameter, which are |
 | | Journal (article/letter/editorial) |
| the ~reater part of the mountain is eoloured as gabbro, and the same rock forms a small peak near the...Arolla glacier) where, according to the map, the gabbro can be seen in situ, in contact with the gneissoid...covered up the junction. Hence my examination of the gabbro has been confined to the specimens which are brought...about 1,, long, of a pyroxenie mineral, augite or diallage, of rather dull non-metallic lustre. The other...rock sometimes occur : and in these may be seen diallage crystals, an inch or so in diameter, which are |
Gabbro, Rosignano Marittimo, Livorno Province, Tuscany, Italy