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- W2035915013 endingPage "690" @default.
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- W2035915013 abstract "Located in the Matagami mining district of the Abitibi greenstone belt, Quebec, the Bell River Complex is a >5-km-thick tholeiitic layered gabbro and/or anorthosite body (2724.6 +2.5/−1.9 MaU-Pb), which likely acted as the heat source that drove hydrothermal convection and volcanogenic massive sulfide (VMS) hydrothermal mineralization in the area.Abundant fractures and veins crosscutting the western lobe of the Bell River Complex formed over a range of temperatures from 250° to 700°C. The 250° to 400°C assemblage, quartz-epidote ± sericite ± chlorite ± plagioclase, is the most widespread and occurs as orthogonal, anastomosing, and random vein sets. Vein densities average between 15 and 25 veins per m2, locally reaching as high as 40 to 60 veins per m2. These veins, typically 1 to 3 mm wide, are interpreted to represent thermal cracking associated with hydrothermal fluid mineralization in the district. Furthermore, they crosscut earlier higher temperature pyroxene-plagioclase (>600°C) and magnetite-rich (300°–600°C) veins (1–10 mm wide; densities commonly ~0–5 veins per m2).Detailed field measurements of quartz-epidote vein geometries coupled with permeability tensor theory have produced a first-order approximation of the maximum model permeability structure (veins unfilled) of the hydrothermal cracking zone. Representative district-wide values indicate maximum model bulk permeabilities of 10−10 to 10−8 m2 for the hydrothermal cracking zone; similar to permeabilities calculated for the fractured sheeted dike complexes of the Semail and Troodos Ophiolites. However, a high-flow zone located within the central parts of the hydrothermal cracking zone is characterized by a maximum model permeability of 10−7 m2. Locally (<1 m2), the high-flow zone reaches maximum model permeability values as high as 10−6 to 10−5 m2 where two or more veins occur with apertures in excess of 2 cm.Mapping has shown that the hydrothermal cracking zone is confined to an ~350-m-thick interval located within a strongly layered gabbro and/or anorthosite horizon of the Layered zone, upper Bell River Complex. The base of this interval is 1,000 m below the top of the Bell River Complex. Furthermore, in and around the town of Matagami, the dominant orientation of quartz-epidote veins parallels the orientation of the layering (110° ± 15°). This parallelism is further reflected in the orientation of the calculated quartz-epidote vein permeability tensors (94° ± 30°, 1σ, n = 71). The parallelism suggests that heterogeneities associated with the layer contacts provided planes of low tensile strength along which the hydrothermal cracks preferentially developed. Such an interpretation further explains why the hydrothermal cracking zone appears to be restricted to the strongly layered zone; there are many more low tensile strength planes.Zones of quartz-epidote veining approximately orthogonal to layering are also present. The orthogonal veins are usually less continuous and commonly truncated (but not crosscut) by layer-parallel veins. The orthogonal subset of veins is interpreted to represent short pathways that allowed fluids to travel between adjacent layer-parallel veins. However, locally, longer layering-orthogonal quartz-epidote veins, showing offsets of 10 to 30 cm normal to the layering of the Bell River Complex, may represent initial conduits that allowed fluids to travel into overlying stratigraphy and through to the paleosea floor.Although volumetrically small in comparison with the permeability structure of the bulk sea floor, the significantly higher permeability of the hydrothermal cracking zone indicates its importance in controlling the flow paths and fluxes of fluids deep within the hydrothermal system." @default.
- W2035915013 created "2016-06-24" @default.
- W2035915013 creator A5040845528 @default.
- W2035915013 creator A5075598333 @default.
- W2035915013 date "2007-06-01" @default.
- W2035915013 modified "2023-10-17" @default.
- W2035915013 title "Fracture Analysis of a Volcanogenic Massive Sulfide-Related Hydrothermal Cracking Zone, Upper Bell River Complex, Matagami, Quebec: Application of Permeability Tensor Theory" @default.
- W2035915013 cites W1553603855 @default.
- W2035915013 cites W1567393896 @default.
- W2035915013 cites W1581830694 @default.
- W2035915013 cites W1669103651 @default.
- W2035915013 cites W17253664 @default.
- W2035915013 cites W1747260157 @default.
- W2035915013 cites W1792167038 @default.
- W2035915013 cites W1967746142 @default.
- W2035915013 cites W1969225519 @default.
- W2035915013 cites W1970961082 @default.
- W2035915013 cites W1972928272 @default.
- W2035915013 cites W1977664265 @default.
- W2035915013 cites W1978389715 @default.
- W2035915013 cites W1978555438 @default.
- W2035915013 cites W1983067651 @default.
- W2035915013 cites W1984803109 @default.
- W2035915013 cites W1990724354 @default.
- W2035915013 cites W1990782149 @default.
- W2035915013 cites W1995198158 @default.
- W2035915013 cites W1996266935 @default.
- W2035915013 cites W1998234287 @default.
- W2035915013 cites W1999207222 @default.
- W2035915013 cites W1999441529 @default.
- W2035915013 cites W2000816736 @default.
- W2035915013 cites W2002555513 @default.
- W2035915013 cites W2006063745 @default.
- W2035915013 cites W2007036174 @default.
- W2035915013 cites W2007055724 @default.
- W2035915013 cites W2007116652 @default.
- W2035915013 cites W2007970519 @default.
- W2035915013 cites W2010298998 @default.
- W2035915013 cites W2013634805 @default.
- W2035915013 cites W2014572538 @default.
- W2035915013 cites W2018988765 @default.
- W2035915013 cites W2022521625 @default.
- W2035915013 cites W2023366799 @default.
- W2035915013 cites W2023625712 @default.
- W2035915013 cites W2024335963 @default.
- W2035915013 cites W2034616078 @default.
- W2035915013 cites W2037945166 @default.
- W2035915013 cites W2039443168 @default.
- W2035915013 cites W2042362098 @default.
- W2035915013 cites W2044368181 @default.
- W2035915013 cites W2044395857 @default.
- W2035915013 cites W2045269768 @default.
- W2035915013 cites W2046262541 @default.
- W2035915013 cites W2047866664 @default.
- W2035915013 cites W2048615184 @default.
- W2035915013 cites W2053702065 @default.
- W2035915013 cites W2055044852 @default.
- W2035915013 cites W2058206594 @default.
- W2035915013 cites W2061160557 @default.
- W2035915013 cites W2061180928 @default.
- W2035915013 cites W2065905303 @default.
- W2035915013 cites W2072527059 @default.
- W2035915013 cites W2076221354 @default.
- W2035915013 cites W2076659016 @default.
- W2035915013 cites W2080790482 @default.
- W2035915013 cites W2084712840 @default.
- W2035915013 cites W2089921628 @default.
- W2035915013 cites W2091991433 @default.
- W2035915013 cites W2093714353 @default.
- W2035915013 cites W2102879515 @default.
- W2035915013 cites W2103412746 @default.
- W2035915013 cites W2104692056 @default.
- W2035915013 cites W2105037086 @default.
- W2035915013 cites W2109409781 @default.
- W2035915013 cites W2109573693 @default.
- W2035915013 cites W2115396824 @default.
- W2035915013 cites W2116704356 @default.
- W2035915013 cites W2120561086 @default.
- W2035915013 cites W2128996948 @default.
- W2035915013 cites W2129596536 @default.
- W2035915013 cites W2136887969 @default.
- W2035915013 cites W2137693422 @default.
- W2035915013 cites W2140080087 @default.
- W2035915013 cites W2156218776 @default.
- W2035915013 cites W2170432388 @default.
- W2035915013 cites W2185696359 @default.
- W2035915013 cites W2185778412 @default.
- W2035915013 cites W2187626844 @default.
- W2035915013 cites W2187978397 @default.
- W2035915013 cites W2188499961 @default.
- W2035915013 cites W2188549609 @default.
- W2035915013 cites W2209100281 @default.
- W2035915013 cites W2332732046 @default.
- W2035915013 cites W2338846737 @default.
- W2035915013 cites W2339846332 @default.
- W2035915013 cites W2342846905 @default.
- W2035915013 cites W2470778569 @default.
- W2035915013 cites W2480657467 @default.