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| ...................................... Preston gabbro.................................................................................. Effect of the gabbro intrusion.................................. Effect......................................... Preston gabbro..................................................the Preston gabbro......I............ T.. Contract metamorphism. due to the Preston gabbro............................. Chlorite and asbestos veins in gabbro................................ Special erosionalfeatures |
 | Ibinoof, M.A., Bumby, A.J., Grantham, G.H., Abdelrahman, E.M., Eriksson, P.G., le Roux, P.J. (2016) Geology, geochemistry and Sr–Nd constraints of selected metavolcanic rocks from the eastern boundary of the Saharan Metacraton, southern Sudan: A possible revision of the eastern boundary. Precambrian Research, 281. 566-584 doi:10.1016/j.precamres.2016.06.010 | Journal (article/letter/editorial) |
| University of Pretoria, South Africa Council for Geoscience, Pretoria, South Africa d Geological Research...Sciences, Faculty of Science, University of Cape Town, South Africa b c a r t i c l e i n f o Article history:...volcano-sedimentary rocks in the Central African Republic. Dismembered and low-grade metamorphosed occurrences...of layered gabbro and minor cumulate hornblendite and a top layer of thick massive gabbro, pillowed basalt...Neoproterozoic oceanic arc/backarc assemblage. The massive gabbro and pillowed basalt of the Arid unit show the geochemical |
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| Falls, the most important town in the iron-bearing district of the same name. All are to be found in an area...direct contacts, but it is inferred from the occurrence of sedimentaries between the igneous exposures...under the title of "The Crystal Falls Ironbearing District of Michigan." For details which are not warranted...sedimentaries and intrusion of molten magma in a district no farther removed from the scene of eruptive...eruptive activity than is the Crystal Falls district from the Keweenawan, a distance of about thirty miles. It |
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| Geophysics Chinese Academy of Sciences Beijing People’s Republic of China Supervisor Prof. Ke-Zhang Qin Institute...Geophysics Chinese Academy of Sciences Beijing People’s Republic of China ISSN 2190-5053 ISSN 2190-5061 (electronic)...and geochronology of acidic rocks in the Beishan region, NW China: petrogenesis and tectonic implications...Craton in the north to the Tarim Craton in the south (Fig. 1.1; Sengör et al. 1993; Jahn et al. 2000a...Early Carboniferous. Whereas the existence of the South Tianshan ocean between the Tarim Craton and Middle |
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| ..................... Primary divisions of the region..--.........-.--.-.--.-.-.. Okanogan Valley .....-----.-.------.....-----.-.-.-...---Mount Baker district ................................... ..... Preliminary...............\................. ........ .... Occurrence........................................................:...................... 34 Hamilton district............................ .."..... .. .--.....dioritic rocks ............................... 45 Gabbro and diabase near Loomis ............-.---....-- |
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| WALCOTT, ])irector THE VERMILION IRON-BEARING DISTRICT OF MINNESOTA \VITH J. AN ATLAS M:oRG^]sr cle]mej^ts...of the I. 29 district 29 Introduction Previous geologic work 29 in the district Scope of the paper...Mesabi or Giants range. Area north and northwest The gabbro plateau 35 of Giants 36 37 38 range Gunfiint...Ely greenstone 130 Features of the greenstone Occurrence and character Distribution 131 131 - Exposures...composition of the metamorphosed rocks Contact effect of gabbro on greenstone Relation to adjacent formations |
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| ............ 49 Gabbro on Esther Island.............................x.... 49 Gabbro on Latouche Island...1908, which complete the preliminary work in this district. Should the mining interests continue to develop...far as possible the general laws governing the occurrence of the ore bodies. Incidental to this study,... facts were gathered bearing on the occurrence and extent of individual ore bodies, and many of these...however, that this statement of the geology of the region will be of great benefit to the mining interests |
 | TEGNER, C, DUNCAN, R, BERNSTEIN, S, BROOKS, C, BIRD, D, STOREY, M (1998) 40Ar39Ar geochronology of Tertiary mafic intrusions along the East Greenland rifted margin: Relation to flood basalts and the Iceland hotspot track. Earth and Planetary Science Letters, 156 (1) 75-88 doi:10.1016/s0012-821x(97)00206-9 | Journal (article/letter/editorial) |
| North Atlantic borderlands. More than ten layered gabbro complexes, including the -55 Ma Skaergaard intrusion...distinct time windows. Only Intrusion II of the Imilik Gabbro Complex, the Skaergaard intrusion, and the Sorgenfri...basalts and continental breakup. Other layered gabbro intrusions at Imilik (Intrusion III), Kruuse Fjord...incremental heating experiments from major layered gabbro intrusions and a large sill complex of the East...40Ar contamination. Geochemical data for the dated gabbro intrusions are discussed in a companion paper by |
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| ............................... Seven Troughs district.................................................Outlook for the district................................................. Rosebud district................................................... Red Butte district........................................................................ Chafey and the Sierra district.......................................... Kennedy............ Types of deposits represented in the region................................... Basis of classification |
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| AHVENISTO MASSIF IN FINLAND THE AGE OF THE SURROUNDING GABBRO-ANORTHOSITE COMPLEX AND THE CRYSTALLIZATION OF...AHVENISTO MASSIF IN FINLAND THE AGE OF THE SURROUNDING GABBRO-ANORTHOSITE COMPLEX AND THE CRYSTALLIZATION OF...ROCKS OF THE GABBRO -ANORTHOSI TE COMPLEX . . . . . . . . . . . .. . MARGINAL ZONES OF THE GABBRO-ANORTHOSITE...OF THE GABBRO-ANORTHOSITE COMPLEX AGAINST OLDER ROCKS AND THE BOUNDARIES BETWEEN DIFFERENT GABBRO -ANORTHOSITE...30 CONTACTS BETWEEN THE MICROCLINE GRANITE AND GABBRO -ANOR THOSITE INTRUSIONS . . . . . . . . . . . |
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| schist-__--__-____-__-_-____--__--_-.-__--___ Occurrence ______--_----_-_---_-_---_-------------------General...greenstone-----___-_-_-_-_-__---__--__-____--_-----___ Occurrence __-_-_____--__-_._--___-_-_. ________ .___ General...group ----_-----_-_--__..____-_-----_-_--___ Occurrence ______________________________________________... ______-___-_____________________ ______.___ Occurrence __-___-___-___-__-.___-___-___________-_-_--__..._____________________________________________ Occurrence _---__-----_-_-___________-___________________ |
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| distribution________________________________ Ketchikan district.._______________________________________ Vicinity..._ Page 45 49 49 52 57 59 60 66 68 68 Juneau district..... ____________--___-____-_-. Schistose greenstone...neighboring islands.____________________ Character and occurrence.______________________________ Fossils..------...rocks-___________________________________ Southern Ketchikan district, by Theodore Chapin_______. 88 90 90 94 94 94...__-_--________-----___---------__---Character and occurrence._____-___-______--_--_-__-_-_ Age and correl |
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| Appalachian region................................................... 21 21 Great Lakes region...........Mississippi Valley region.............................................. Ozark region.....................Rocky Mountain region............................................... Great Basin region ................Appalachian region....................................:.............. Great Lakes region ..............Rocky [Mountain region............................................... Great Basin region ............. |
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| .............................. Character and occurrence.................................. Metamorphism............................... *Condition of the region in pre-Cambrian time................... Algonkian................................. Character and occurrence. .^ ........................... Smithfield limestone...................... Iron ores of the Richmond district............................. Eastern Massachusetts............................................... Occurrence............................................. |
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| chemistry and simple modeling indicate that each gabbro body records different magmatic processes ranging...during the Tertiary (Froitzheim et al. 1996). The south-Pennine ophiolites of the Arosa zone, the Platta...to epidote-amphibolite facies conditions in the south (Malenco complex, Trommsdorff and Evans 1974). Together...1b). In the Fuorcla da Faller area, an individual gabbro body, about 100 m across, largely preserves its...diversity in composition, from primitive olivine-gabbro to highly differentiated Fe-Ti-P- gabbros and diorite |
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| WALCOTT, DIRECTOR THE MENOMINEE IRON-BEARING DISTRICT OF MICHIGAN BY WILLIAM SHIRLEY BAYLEY CHARLES...tongue Economic importance of the district Previous work in the district 35 Method of 33 35 36 - ...study 277 Upper Menominee series Character and occurrence Component formations Section 2. 280 280 280...and relations Age Section W 500 Lake Superior region 501 503 ILLUSTRATIONS. Page. Plate I. map...Geological of part of Menominee with II. of the region Felch Mountain of the respect to other III. |
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| zonations a section of a tourmaline crystal (.Malagasy Republic) in 32 be deposited on growth surfaces (crystal...objects or replacing fibers of wooden supports. Occurrence up to 3 cm (1 .1 The 8 finest crystals of...mineral, either in ciated with calcite or e Occurrence The finest dendritic and wirelike crystals come...deposits, formed at high hydrothermal conditions. Occurrence The main gold-bearing temperature under districts...districts are the Witwa- tersrand (South Africa), the Mother Lode (California, USA), the Yukon (Alaska |
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| ............................. Basic stock; its gabbro and diorite phases -................_...... Basic...and a study of the geological structure of the region proves, that Ascutney is a residual of erosion...weather than either the gabbro-diorite stock on the north or the gneisses on the south. The shapely cone north...gorge-like part of its course between the elbow south-southeast of Windsor and its confluence with the...a complex stock-like boss. The structure of the region shows that the radiating drainage is not the result |
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| Blue Mountain is a central-type alkali ultrabasic-gabbro ring complex (lxl-5 km) introducing Upper Jurassic...titanaugite-ilmenite gabbro and lamprophyre. The margin of the intrusion is defined by a ring dyke of alkali gabbro. The...titanaugite-ilmenite gabbro and lamprophyre ring dykes, marginal alkali gabbro and lamprophyre dyke swarm...the Inland Kaikoura Range, Marlborough Province, South Island of New Zealand. Reconnaissance surveys by...Blue Mountain is a central type alkali ultrabasic-gabbro ring complex of Cretaceous age and is the smaller |
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| DIEECTOE BULLETIN 608 ^A'£Vfy r THE BROAD PASS REGION, ALASKA BY FRED H. MOFFIT WITH SECTIONS ON QUATERNARY............'......................... 60 Olivlne gabbro..................................................Broad Pass region.... In pocket. II. Geologic reconnaissance map of the Broad Pass region........ In...Glacier........................................ A, South wall of Broad Pass viewed from the bars of Jack...distribution of spruce timber in the Broad Pass region............................................... |
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| Appalachian region ..................................................... 155 Great Lakes region ................................... 155 Rocky Mountain region.................................................................................... Appalachian region ................................................................................ Rocky Mountain region......................................................................^............. Appalachian region .............................................. |
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| Synonyms and Other Names or Spellings Deposit or District Name Province Latitude Longitude Commodity(s)...the name of the mine, deposit, field, area, or occurrence being described. Synonyms and Other Names or...might also 5 include any specific mine or occurrence names that are known, i.e. "includes Northern...Deposit or District Name field contains the name of any larger deposit, field, or district to which the...site has produced and when or if it is a mineral occurrence or showing. Host Rock Age and Host Rock contain |
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| One characteristic of the Shimanto belt is the occurrence of well developed magmatic bodies of Middle Miocene...Most of the studied igneous complexes lie to the south of the BTL (Fig. 1 ). K-Ar (mineral and whole-rock)...Muroto and Shionomisaki Eto T-Morb are located far south along the Pacific coast. The I-type complexes crop...assemblages. The complexes show various modes of occurrence. Shibisan, Takakuma, Ichifusa, Uwajima 88 ...Petrography The Ashizuri complex, ranging from gabbro to syenite and biotite-granite, is the only alkaline |
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| differentiation. _______ .___.__--__------.-_--Gabbro.... ........ ------..----------------------.------Dikes...ILLUSTRATIONS PLATE 11. Geologic map of Willow Creek district._______-_----__-__-_ 12. A, Chalcopyrite-molybdenite...mixed sulphides (the Eureka area in the Kantishna district, Mount Eielson, formerly known as Copper Mountain...of the nonmetalliferous resources of the entire region traversed by the railroad was included in the projects...become more favorable cannot be doubted. The entire region is becoming more accessible each year, and as a |
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| .............................................. Gabbro......................................................................................... 57 Occurrence and character..................................ILLUSTRATIONS. Pago. PLATE I. Map of the St. Cloud region, Minn., showing rock outcrops and quarries.......FIGURE 1. Sketch map showing relations of rocks south of Sauk Rapids Bridge, sec. 2, St. Cloud Township...St. Cloud region................... 56 58 6. Strike of aplite dikes in the St. Cloud region......... |
