 | | Journal (article/letter/editorial) | | com/locate/precamres The formation of the Sudbury breccia in the North Range of the Sudbury impact structure Bruno Lafrance...Rietveld modal mineralogy a b s t r a c t In the North Range of the ca. 1.85 Ga Sudbury impact structure...long area immediately underlying the SIC in the North Range (Fig. 1). We analyzed the major and trace...more abundant immediately below the SIC, and the North Range escaped the post-impact reverse faulting event...Our results suggest that Sudbury breccia in the North Range formed by cataclasis in the displaced zone |  | | Journal (article/letter/editorial) | | 505-520 (2000) 0 Meteoritical Society, 2000 Printed in USA The South Range Breccia Belt of the Sudbury Impact...quartz, and ilmenite, with trace amounts of plagioclase, zircon, titanite, epidote, pyrite, chalcopyrite...SIC, and geochemical heterogeneities between the north and south ranges of the SIC have been attributed...granitoid and Levack gneissic target rocks in the North Range, and the Huronian metasedimentary and metavolcanic...(Archean) Sudbury Igneous Complex (SIC) Frood - Stobie Mine Huronian Supergroup Offset dykes: (metasedimentary |  | | Report (volume) | | Nickel Deposits of North America By H. R. CORNWALL GEOLOGICAL SURVEY BULLETIN 1223 Geology, resources...-----------------------------------Alexo Nickel mine ____________________________________ - ___ Kenora...----------------------------------------Saline CountY--------------------------------------------Cal...---------------------------------------Boulder CountY------------------------------------------Conne...-----------------------------------------JGnox CountY--------------------------------------------Min |  | | Journal (article/letter/editorial) | | Pseudotachylytes and their host rocks from the North Range of the 1.85 Ga Sudbury impact structure have...mechanically resistant quartz and, to a lesser extent, plagioclase as included mineral clasts. Three distinct assemblages...also been observed in Sudbury plagioclase (Dressler 1984), and Speers (1957, p 502) described optically...optically isotropic plagioclase in clasts within pseudo- 361 tachylytes from north and east of the SIC which...previously referred to as Levack Breccia in the North Range (north of the SIC) and Frood Breccia in the South |  | Sanislav, Ioan V., Kolling, Sergio L., Brayshaw, Mathew, Cook, Yvonne A., Dirks, Paul H.G.M., Blenkinsop, Thomas G., Mturi, Marwa I., Ruhega, Roger (2015) The geology of the giant Nyankanga gold deposit, Geita Greenstone Belt, Tanzania. Ore Geology Reviews, 69. 1-16 doi:10.1016/j.oregeorev.2015.02.002 | Journal (article/letter/editorial) | | University, Townsville, 4011 QLD, Australia Geita Gold Mine, Geita, P.O. Box 532, Geita Region, Tanzania School...The geological literature on the Geita area of North West Tanzania is extremely limited in spite of the...in a series of internal reports (e.g., Ryan and Speers, 2002; Porter, 2003; Skead et al., 2003; Marjoribanks...by undeformed 2660 and 2620 Ma granites to the north, east 3 and west (Sanislav et al., 2014), and...dominated unit; e) example of typical porphyritic plagioclase diorite forming the main intrusive body in the |  | | Journal (article/letter/editorial) | | ite)and the other is rich in plagioclase(referred to as the plagioclase-richrock). Field observationssuggestthat...granophyricmicropegmatiteintrudesand engulfsthe plagioclase-richrock. Modally the latter rock is distinguishedfrom...overlies the noritc of the Irruptive. Augite of the plagioclase-richrock is MgO-rich in comparisonwith that of...gabbro. Whole rock chemical data indicatethat the plagioclase-rich rock is similar to the upperpart of the...Na•.O, K20, and CaO. It is concluded that the plagioclase-rich rock is a phaseof the upperpart of the oxiderich |  | | Journal (article/letter/editorial) | | (1990) © Meteoritical Society, 1990. Printed in USA Implications for cratering mechanics from a study...1990) Abstract-The Footwall Breccia layer in the North Range of the Sudbury impact structure is up to 150...dikes. The Footwall Breccia is most abundant in the North and East Range (Dressler, 1984). gations were centered...Trill Township of the Sudbury North Range (Fig. I). GEOLOGY In the North Range of the Sudbury crater,...cross-section through the Footwall Breccia layer ofthe North Range (not scaled), showing genetic relationships |  | | Journal (article/letter/editorial) | | Nickel Irruptive and the Superior Province granites north of Sudbury R. W. HURST* Department of Geology,...Sudbury Nickel Irruptive, Superior Province granites north of Sudbury, Sudbury Breccia and subsequent metamorphism...disturbed and does not yield an isochron. A plagioclase-whole rock pair from the norite near the norite-mi~o~gmatite...Rb%r studies of the Superior Province granites north of Sudbury y&Id an age of 2698 + 162 Mvr (I.R. =...Superior Province granites. The granitic rocks _ 150km north of Sudbury have been undisturbed for _ 2.6 Byr based |  | | Journal (article/letter/editorial) | | sheet in the makeup of the breccias. Quartz and plagioclase in clasts and matrix of the breccias are transected...long been recognized to be similar in appearance (Speers, 1957) and origin as the Vredefort breccias (Dietz...an igneous textured matrix defined by stubby plagioclase laths that grew during contact metamorphism next...rocks set in a black to dark grey aphanitic matrix (Speers, 1957; Dietz, 1964; Dressler, 1984a; Peredery and...after primary clinopyroxene(?), tabular laths of plagioclase, orthopyroxene, as well as minor quartz, oxides |  | | Journal (article/letter/editorial) | | conditions (e.g. Garrison, 1939; Jefferis, 1982; Speers et al., 1987). This phenomenon is commonly attributed...below. First, the authors state that the large plagioclase content of the DY-100S bentonite ‘‘may hinder...edition. Gulf Professional Publishing, Houston, Texas, USA. Garrison, A.D. (1939) Surface chemistry of clays...cutoff walls. Clays and Clay Minerals, 60, 40 51. Speers, R.A., Holme, K.R., Tung, M.A., and Williamson |  | | Report (issue) | | ............................................18 North Range Deposits ...................................Huronian Supergroup and other Proterozoic rocks], just north of the Grenville Province (Figure 1). It comprises...which are very widespread and occur up to 80 km north of the Igneous Complex. The footwall rocks are Archean...gneisses and granitic and mafic igneous rocks to the north, west, and east of the Complex, and metavolcanic...townships), dip vertically or are overturned and north dipping, where they are within 100 to 750 m of |  | | Journal (article/letter/editorial) | | A Study of the Strathcona Mine and Its Bearing on the Origin of the Nickel-Copper Ores of the Sudbury...base of the Sudbury Nickel Irruptive along the north rim of the Sudbury basin. In the vicinity of the...contains a higher proportion of xenoliths. A quartz-plagioclase-augite gneiss (the 'footwall gneiss') underlies...near, magmatic temperature. The composition of plagioclase in the felsic norite, mafic norite, and xenolithic...to the footwall breccia. The composition of plagioclase within the breccia varies between An32 and An43 |  | | Journal (article/letter/editorial) | | graphite and associatedrocks at the Franklin Pierce mine, Goshen, New carbonin vein graphiteis not derived...Cosmochim.Acta, v. 7, p. 255-286. Hobson,G. D., and Speers,G. C., eds., Advancesin organic Mainwaring,P.,...carbonisotopesin Swedishrocks:Jour. Geology, Amsterdam,North-Holland, p. 92-102. Smith,J. W., Schopf,J. W., and...591-595. Melson,W. G., and Switzer,G., 1966, Plagioclase-spinel-graphite 113ratios:GeochemistryInternat |  | Naldrett, A. J., Bray, J. G., Gasparrini, E. L., Podolsky, T., Rucklidge, J. D. (1970) Cryptic variation and the petrology of the Sudbury nickel irruptive. Economic Geology, 65 (2) 122-155 doi:10.2113/gsecongeo.65.2.122 | Journal (article/letter/editorial) | | of sedimentary rocks. The Irruptive rocks of the north and east ranges of the ring resemble one another...range. On the north and east ranges, 1,000 from 1,500 feet of "felsic noritc," a plagioclase-hypersthene-orthocumulate...e-orthocumulate, consistingof about 50% plagioclase,15% hypersthene,7% augitc and 25% of a micrographicintergrowthof..."oxide-richgabbro," a plagioclase-augite-ulvospinel orthocumulate,consisting,on average, of 47% plagioclase,22% augitc...that it is much more strongly sheared,resemblesthe north range micropegmatite. The upper gabbro is underlainby |  | | Journal (article/letter/editorial) | | Cosmochim.Acta, v. 7, p. 255-286. Hobson,G. D., and Speers,G. C., eds., Advancesin organic Mainwaring,P.,...carbonisotopesin Swedishrocks:Jour. Geology, Amsterdam,North-Holland, p. 92-102. Smith,J. W., Schopf,J. W., and...591-595. Melson,W. G., and Switzer,G., 1966, Plagioclase-spinel-graphite 113ratios:GeochemistryInternat |  | | Report (issue) | | in Southern Mecklenburg County and Vicinity, North Carolina 'and South Carolina By Frederick Albert Wilson...IN SOUTHERN MECKLENBURG COUNTY AND VICINITY NORTH CAROLINA AND SOUTH CAROLINA By Frederick Albert Wilson...part of the Charlotte and Carolina slate belts in southern Mecklenburg County and vicinity to help interpret...as metavolcanic rocks* Gravity models of the Carolina slate belt Indicate that it is a synform containing...work II. 11 ^*c*rtT ^^^y Intr oduct Ion 11 Carolina slate belt 13 Millingport Formation 14 Cid |  | | Journal (article/letter/editorial) | | fine-grained,even-textured grey rock that contains plagioclase,perthitic alkali feldspar, biotite, ferrian-ilmenite...bearing rock should not be stable North Carolina. The rock contains plagioclase, eastern with hematite. perthitic...feldspar rocks, an alkali In qtartz, and ilmenite. Speers estimated the condition of always present.Addition...Dome, has a mineral assemblagethat contains plagioclase, perthitic alkali feldspar, garnet, biotite,...garnet, muscovite, magnetite, quartz, as well as plagioclase, staurolite, cordierite, chlorite, and ilmenite |  | | Journal (article/letter/editorial) | | between the two have been noted as well (e.g., Speers, 1957; Dressler, 1984; Reimold, 1991; Rousell et...pairs from the Sudbury impact structure, Canada (Speers, 1957; Rousell et al., 2003; Al Barazi et al.,...matrix is generally composed of alkali feldspar, plagioclase, pyroxene, amphibole, Ti-augite, biotite, muscovite...displaying microcrystalline matrix with intersertal plagioclase enveloping minute quartz fragments. (b) Flow-banded...matrix is associated with quartz fragments. Plagioclase fragment at the vein margin is broken off from |  | | Journal (article/letter/editorial) | | Mesozoic shales in the Bergen High area, northern North Sea, was studied using mineralogic, isotopic, and...fields in the Norwegian sector of the northern North Sea (Figure 1). The goals of the study were: (1)...migration in the Brent sandstone; and (4) to contrast North Sea shale diagenesis with diagenetic trends in shales...Group sandstones in the Bergen High area, northern North Sea, consist largely of hemipelagic mudstones and...northern North Sea and have been widely studied to determine maturation history (Dahl and Speers, 1985; |  | | Journal (article/letter/editorial) | | Copyright© 1996 ElsevierScienceLtd Printed in the USA. All rights reserved 0016-7037/96 $15.00 + .00 Pergamon...Institute, 3600 Bay Area Boulevard, Houston, TX 77058, USA 2Bundesanstalt ftir Geowissenschaften und Rohstoffe...of these rocks up to a distance of about 80 km north of the SIC (Dressier, 1984; Peredery and Morrison...to 30 km north of the Grenville Province. Gneissic rocks of the Superior Province to the north of the structure...al., 1984). Outliers of these rocks also occur north and west of the SIC and, coupled with the presence |  | | Journal (article/letter/editorial) | | ..................... 536 Zoning at the Frood Mine .................................................. zonaldistributionof mineralsin the famousFrood mine of the Sudbury district(Fig. 1), although notedby...brecciais one of the outstanding examplesof what Speers(26) refersto as commonSudburybrecciaof pre-.norite...thoughnot yet clearly delineated,was believed by Speers to be confined largely to the northern contact...notedmanyyearsago, of nearlyequal amountsof plagioclase (zonedbytowniteto oligoclase),quartz, hornblende |  | | Journal (article/letter/editorial) | | water for Na in clay minerals; (3) weathering of plagioclase to montmorillonite; (4) precipitation of zeolite...and 67) show the phenocrysts consist mainly of plagioclase feldspar with lesser amounts of alkali feldspar...feldspar and quartz (Table 1). Four plagioclase samples range in Ca content from 17--45% (BARROWS,1972). A...contains 1136% phenocrysts of predominantly plagioclase and 498 James M. Thomas et al. Table 1. Mineralogical...Groundmass Phenocrysts Quartz Alkali feldspar Plagioclase Biotite Pyroxene Mean Range Mean Range 93 |  | | Report (issue) | | rock: pre-crater?. .......... 15 Stop (2) Maclellan Mine. Breccia preserved as boulders in glacial drift...Irruptive. ............... 21 Stop (7) Near Strathcona Mine: contact between Sudbury breccia and sublayer ....control in the vertical direction has been provided by mine workings and exploratory drilling. In spite of...at 1.7 b.y. These rocks form ridges, e.g., the North Range and South Range (fig. 2). In most places,...Basin is surrounded by Precambrian rocks. To the north and west, there consist of granite and gneiss more |  | | Report (volume) | | -GEOL_OGIC .AL ,.,.. i ' I Bibliography of North American Geology, 1957 By RUTH REECE KING, VIRGINIA...___________ III 1 3 9 271 BIBLIOGRAPHY OF NORTH AMERICAN GEOLOGY 1957 By RuTH REECE KING, VIRGINIA...appeared during 1957 concerning the geology of the North American continent, including Greenland, the West...in foreign journals are cited if they deal with North American localities or are of a general nature,...with foreign areas. Articles by foreign authors on North America are included regardless of place of publication; |  | | Journal (article/letter/editorial) | | block rotation of the south range relative to the north range. Two phasesof remanence-carryingsulfide have...intrusion the remanence directions observed on the north and of the norite. We describe the tectonometa-...method of defining rotation of the north range. Accepting that the north range norite remanence was acquired... they noted that "the original attitude of the north range can therefore be reconstructed by rotating...restricted TABLE 2. to each remanence at that North Range Remanences N3 Site no. TR N•p No R |
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