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hematite from Rhode Island

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Journal Article
Published: 01 February 1922
American Mineralogist (1922) 7 (2): 27–29.
...Alfred C. Hawkins Abstract The minerals here described are all from localities not previously mentioned in the literature. They were collected while the writer was teaching at Brown University in 1915-16. The apatite was measured on the two-circle goniometer at Harvard University, and thanks...
Journal Article
Published: 15 August 2007
Canadian Journal of Earth Sciences (2007) 44 (7): 1005–1013.
... are composed of glass, cordierite-group minerals, hematite, magnetite, tridymite, mullite, and cristobalite. They represent paralavas resulting from subsurface combustion of the Tertiary coal seams under conditions similar to those in a blast furnace. An origin by anthropogenic activity or a volcanic origin...
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Journal Article
Journal: Economic Geology
Published: 01 November 2020
Economic Geology (2020) 115 (7): 1519–1536.
... not reveal the same systematic relationship between decreasing δ 18 O values and increasing hematite content as reported by Rhodes and Oreskes ( 1999 ). Nyström et al. ( 2008 ) reported that the range of δ 18 O values in magnetite from “magmatic-textured ore” overlaps the range of δ 18 O values...
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Journal Article
Published: 01 October 2011
American Mineralogist (2011) 96 (10): 1537–1546.
... and nearly disappears at x = ~0.6. Combining the two relative intensities potentially provides a sensitive indicator of Ti content. The technique was applied to study titanomagnetite in grains from Hana Volcanics and melatroctolite from Rhode Island. * E-mail: zinin@soest.hawaii.edu 09 05 2011...
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Journal Article
Published: 19 May 2023
Canadian Journal of Earth Sciences (2023) 60 (9): 1349–1355.
... by “old fashioned stratigraphy” from Avalonian inlier to inlier ( Landing et al. 2019 ) defines a unified Avalonian terrane from Rhode Island to Belgium ( Landing 1996 ; Landing et al. 2022 , 2023 ). Avalonian areas in the A–C orogen, as the Mb, should not be regarded as terranes, but are Middle...
FIGURES
Journal Article
Journal: Economic Geology
Published: 01 November 2017
Economic Geology (2017) 112 (7): 1595–1628.
... of pyrite in drill core from up to 500 m in depth. Massive anhydrite presumably related to the earlier alkalicalcic alteration was replaced by gypsum, and magnetite was altered to hematite during the acid-sulfate alteration. The formation of large amounts of gypsum is interpreted to have been related...
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Journal Article
Journal: Geology
Published: 01 June 2016
Geology (2016) 44 (6): 427–430.
... is pervasively altered to hematite. The hydrothermal fluids at El Laco could have been derived from three possible reservoirs: (1) magmatic-hydrothermal fluids from the degassing of a crystallizing magma; (2) basinal fluids convecting from nearby salares (salt lakes); or (3) meteoric waters from...
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Journal Article
Published: 27 May 2003
Canadian Journal of Earth Sciences (2003) 40 (5): 715–730.
... of lack of outcrop. The fossil grainstone of the Red Head boulder with its hematite ooids, apparent glauconite grains, and fauna dominated by orthids, gastropods, and bivalves suggests an extension of the high-energy, shallow sedimentary iron ore facies. Although available outcrops of Bell Island –Wabana...
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Journal Article
Published: 01 February 2013
Clays and Clay Minerals (2013) 61 (1): 11–25.
... soluble at pH 7–8 ( Schwertmann and Murad, 1983 ), where goethite formation has its minimum and hematite is favored. Conversely, goethite formation from ferrihydrite has its maximum at pH 12 in alkaline media and pH 4 in acidic media at room temperature ( Schwertmann and Murad, 1983 ). The third notable...
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Journal Article
Journal: Geology
Published: 18 March 2020
Geology (2020) 48 (5): 514–518.
... nanoparticles. Hematite He analyses of undeformed starting material are compared with those of FM and gouge run products from high-slip-velocity experiments, showing >71% ± 1% (1σ) and 18% ± 3% He loss, respectively. Documented He loss requires short-duration, high temperatures during slip. The spatial...
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Journal Article
Published: 01 April 2005
The Canadian Mineralogist (2005) 43 (2): 585–599.
... aggregates ( Figs. 4a, b ) and individual subhedral to euhedral grains that range in size from 0.1 to 2 mm. In the southern part of Gamsberg, the C2 unit is dominated by massive, fine-grained garnet–quartz–hematite rocks (sample G77–632). Garnet is commonly poikiloblastic and contains inclusions of quartz, K...
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