... and zircon supports the contention that this granite was produced in a magmatic arc environment and, therefore, is likely an extension of the older Dubois Greenstone Belt of the Gunnison Igneous Complex (GIC) and the Needle Mountains (1,770–1,755 Ma). Rocks of the younger Cochetopa succession of the GIC...

... of the Dubois greenstone succession: An Early Proterozoic bimodal volcanic association in west central Colorado: Precambrian Research , v. 15 p. 131 – 155 . David , J. , and Syme , E.C. , 1994 , U-Pb geochronology of late Neoarchean tonalites in the Flin Flon Belt, Trans- Hudson orogen...

... rocks in an Early Proterozoic greenstone belt. In the Mako Belt the multi-stage deformed quartz veins and hydrothermally altered protoliths are characterised by distinctive microstructures and CL properties. The high-grade Au-bearing quartz veins contain one or more generations of hydrothermal quartz...

... for the purpose of comparing compositions ( Black, 1975 ; Cathelineau and Nieva, 1985 ; Martinez-Serrano and Dubois, 1998 ). Table 2. Representative EMPA analyses of phyllosilicates (borehole Y2-31: the Mikabu belt; boreholes II-2, IIe-3, IIi-1, IIj-1, IIj-2: the north Chichibu belt...

... origin of Archean greenstone belts and the evolution of the Archean mantle-crustal system ( Sylvester et al., 1997a ; Condie, 1994 , 1998 ; Dostal and Mueller, 1997 ; Polat et al., 1998 ; Kusky and Polat, 1999 ; Polat and Hofmann, 2003 ; Dostal et al., 2004 ). In this study, we report...

.... 64, No. 1–2, 2008 Magnetic signatures related to orogenic gold mineralization, central Lapland greenstone belt, Finland— M.-L. Airo and S. Mertanen 14 Vol. 32, No. 2–4, 2008 Geodynamics and metallogeny of the Altaid orogen— Wenjiao Xiao, Franco Pirajno, and Reimar...

... of Gunnison have been found to represent two separate bimodal assemblages based on U-Pb dating of zircons by Bickford (1986) and Bickford et al. (1989) . The older group, known as the Dubois succession (or “Dubois greenstone”), contains moderately deformed metarhyolites within a thick section...

... sequences currently southwest of the Cheyenne belt may have been built along a subduction zone with varying orientation, including counterclockwise rotation of the subduction zone. Two of the arcs they suggest are the ca. 1.75 Ga Granite Gorge metamorphic suite and the ca. 1.70–1.75 Ga Dubois-Cochetopa...

.... For example, based on the area of greenstone belts, greater than one order of magnitude more gold has been produced in the Yilgarn Craton than in the Pilbara Craton ( Groves et al. 1990 ). As such, gold occurrences in the Pilbara Craton have traditionally received little attention, and there are few modern...

... ). The Dubois succession could reflect arc ( Knoper and Condie, 1988 ) or backarc ( Condie and Nuter, 1981 ) magmatism with associated slab rollback (depicted in Fig. 9 ), or rift magmatism ( Hill and Bickford, 2001 ), any of which could have been associated with extension in the Cheyenne belt region...

... – stratigraphy and age, and their significance . Earth Science (‘Chikyu Kagaku’) 39 , 1 – 17 . Kiminami K , Kontani T and Miyashita S ( 1985 b) Lower Cretaceous strata covering the abyssal tholeiite (the Hidaka Western Greenstone Belt) in the Chiroro area, central Hokkaido, Japan...

... are concentrated within the 2250 to 2000 Ma greenstone belts of the Man-Leo shield, forming the southern part of the West Africa craton. Most of the major orebodies are best classified as orogenic gold deposit types, although there are paleoplacer and porphyry-skarn deposits within some of the greenstone belts...

...-amphibolite facies conditions ca. 1750 Ma and involved north-directed shortening and mylonite development along the Cheyenne Belt ( Fig. 1 ; Duebendorfer et al., 2006 ; D. Jones et al., 2010 ). Rocks of the ca. 1770–1750 Ma Dubois succession are the best candidate for correlative units to the south...

... . Huizenga , J.M. , and Touret , J.L.R. , 1999 , Fluid inclusions in shear zones, the case of the Umwindsi shear zone in the Harare-Shamva-Bindura greenstone belt, NE Zimbabwe : European Journal of Mineralogy , v. 11 , p. 1079 – 1090 . Kerrich , R. , 1987 , The stable isotope...

.... Tollon F. , 2000 , A Paleoproterozoic ultramafic-mafic assemblage and associated volcanic rocks of the Boromo greenstone belt: Fractionates originating from island-arc volcanic activity in the West African craton : Precambrian Research , v. 101 , p. 25 – 47 . Béziat D. Dubois M...

.... Oliver J. DuBois J. Pascal G. Descent of lithosphere beneath New Hebrides, Tonga, Fiji and New Zealand: evidence for detached slabs Nature, London 1973 242 98 101 Burke K. Dewey J. F. Kidd W. S. F. Windley B. F. Dominance of horizontal movements, arc...

... strike of foliation is preserved ( Jessup et al., 2005 ) that is mimicked by northwest-trending volcanic and/or plutonic belts that are progressively younger toward the northeast (Irving- Dubois-Cochetopa; Fig. 9 ). This is interpreted as a complex oceanic arc system (somewhat similar to the present-day...

... , Elsevier , p. 447 – 479 . Condie , K. C. , and Nuter , J. A. , 1981 , Geochemistry of the Dubois greenstone succession: an early Proterozoic bimodal volcanic association in west-central Colorado : Precambrian Research , v. 15 , p. 131 – 155 . Cullers , R. L. , Griffin , T...

... predominantly in greenstone terranes, supracrustal sedimentary rocks became increasingly important as hosts in the Paleoproterozoic. Unusually iron rich 1840 Ma marine mudstones in the Tanami region host one world-class gold deposit and many other large gold deposits. Fluid-rock modelling at 300° and 325°C...

... volcanic rocks of the Boromo greenstone belt: Fractionates originating from island-arc volcanic activity in the West African craton : Precambrian Research , v. 101 , p. 25 – 47 . Béziat D. Dubois M. Debat P. Nikiéma S. Salvi S. Tollon F. , 2008 , Gold metallogeny...