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jasper

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Journal Article
Published: 29 February 2024
Geochemistry: Exploration, Environment, Analysis (2024) 24 (1): geochem2023-002.
... (hematite bands interbedded with jasper bands) Specularite, hematite, rarely magnetite, with sericite, siderite, quartz, calcite 25–50 m 2 Maly Khinghan BIFs Far East, Russia Underlying and overlying strata of iron formation are shale or slate with probable volcanic origin Banded (iron oxides bands...
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Journal Article
Published: 19 September 2023
Journal of the Geological Society (2023) 180 (5): jgs2023-054.
...%. Stage two involved the dissolution of dolomite, evinced by the abundant pores and rhombohedral grains of quartz, to form Cr- and Ni-rich jasper and quartzites. Formation of the jasper–quartzites involves a mass reduction of c. 80%. The listvenite-like and jasper–quartzite rocks show enrichment...
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Journal Article
Journal: Economic Geology
Published: 01 August 2023
Economic Geology (2023) 118 (5): 1085–1124.
... system evolving from low f S 2 / f O 2 conditions, locally sealed by jaspers, to a mound growth stage with widespread subseafloor brecciation/replacement with associated zone refining. Mandoos formed at the onset of the postaxial stage (Geotimes-Tholeiitic Alley transition), and Shinas is hosted within...
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Series: GSA Special Papers
Published: 09 September 2021
DOI: 10.1130/2021.2552(05)
EISBN: 9780813795522
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Journal Article
Journal: Economic Geology
Published: 01 September 2019
Economic Geology (2019) 114 (6): 1207–1222.
..., and minor siderite with distinct alternating iron-rich and silica-rich bands. The hematite shows δ 56 Fe and δ 18 O values in the range of –0.31 to 0.80‰ and 2.2 to 7.0‰, respectively, and the jasper yields δ 30 Si values of –1.90 to –1.20 ‰ . Iron and Si were both derived from hydrothermal fluids related...
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Series: EMU Notes in Mineralogy series
Published: 01 January 2019
DOI: 10.1180/EMU-notes.20.2
EISBN: 9780903056625
... from Pliny’s books, past and current supply areas and, finally, archaeometric provenance issues are addressed for each type of material. As for chalcedony, a comprehensive note on moganite has been included. The next section focuses on chert, flint and jasper. Given the large amount of materials...
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Journal Article
Published: 01 November 2017
Jour. Geol. Soc. India (2017) 90 (5): 623–627.
...Sanjeev Kumar Das; Ranjit Prasad; R. P. Singh; Abhilash ABSTRACT Quick depletion rate of high-grade iron ore paved to emphasise on banded hematite jasper and banded hematite quartzite with ∼30-40% iron. In the present investigation, efforts have been made to characterize the banded hematite jasper...
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Series: GSA Special Papers
Published: 01 October 2015
DOI: 10.1130/2015.2517(02)
Journal Article
Journal: GSA Bulletin
Published: 01 September 2014
GSA Bulletin (2014) 126 (9-10): 1245–1258.
... photosynthesis. Here we present new petrographic evidence from the Marble Bar Chert (in drill hole ABDP1) that shows that hematite in jasper bands formed via mineral replacement reactions. The hematite mostly occurs as sub-micron–sized inclusions within chert (so-called “dusty” hematite) that are typically...
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Journal Article
Published: 30 January 2012
Canadian Journal of Earth Sciences (2012) 49 (2): 455–476.
... of the Rapitan iron formation (65°12.856′N and 132°22.105′W) contains ~30 m of hematite–jasper iron formation. Most of this deposit (called the Crest or Snake River deposit) is located in Yukon. Good exposure in the Northwest Territories is limited to a series of incised canyons along the mountainsides east...
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Journal Article
Published: 01 July 2006
Journal of the Geological Society (2006) 163 (4): 723–736.
... to great depth in the bleached regolith followed the water tables down. The climate was warm and dry with a high water deficit. Groundwater silcretes formed near-horizontal lenses and pods of porcellanite and jasper in the bleached regolith. They preserve the primary fabric of the host rock. Groundwater...
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Journal Article
Journal: Economic Geology
Published: 01 December 2005
Economic Geology (2005) 100 (8): 1511–1527.
...Tor Grenne; John F. Slack Abstract Stratiform beds of jasper (hematitic chert), composed essentially of SiO 2 (69–95 wt %) and Fe 2 O 3 (3–25 wt %), can be traced several kilometers along strike in the Ordovician Løkken ophiolite, Norway. These siliceous beds are closely associated...
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Journal Article
Journal: Geology
Published: 01 April 2003
Geology (2003) 31 (4): 319–322.
...Tor Grenne; John F. Slack Abstract Laterally extensive beds of highly siliceous, hematitic chert (jasper) are associated with many volcanogenic massive sulfide (VMS) deposits of Late Cambrian to Early Cretaceous age, yet are unknown in analogous younger (including modern) settings. Textural studies...
FIGURES
Journal Article
Published: 01 June 2002
Russ. Geol. Geophys. (2002) 43 (6): 512–527.
...I. F. Nikitin Data on the stratigraphy of jasper-basalt deposits of Ordovician age from Central Kazakhstan have been summarized. The age, succession, and correlation between these deposits are refined. Geological dating and correlation are based chiefly on conodonts and, to a lesser extent...
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Journal Article
Journal: Economic Geology
Published: 01 August 2001
Economic Geology (2001) 96 (5): 1227–1237.
... number of stratiform quartz-hematite lenses (red jaspers). Rather than drill test all of these occurrences, a geochemical index was determined to assist in ranking them. Elevated Ba, S, and Pb along with positive chondrite-normalized Europium anomalies were found to be characteristics of proximal jaspers...
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Journal Article
Published: 01 August 1997
Jour. Geol. Soc. India (1997) 50 (2): 227–230.
.... JOUR.GEOL.SOC.JNDIA,VOL.50, AUG.1997 A CURIE BALANCE USING AN OPTICAL MOTION DETECTOR 229 Salrna Dyke (Asansole) ~ 1\ Granulite (South India) \ Gondwana 00 Banded Haernatite Jasper (Orissa) o 100 200 300 4.00 500 600 70G T emperoture Fig. 2. Examples of Sample Results JOURGEOLSOC.INDIA,VOL50, AUG_1997 230 J. A. SHARE...
Journal Article
Published: 01 March 1994
The Canadian Mineralogist (1994) 32 (1): 111–120.
Journal Article
Published: 01 July 1989
Canadian Journal of Earth Sciences (1989) 26 (7): 1325–1342.
...V. M. Levson; N. W. Rutter Abstract Geomorphic, stratigraphic, and sedimentologic evidence obtained from Quaternary sediments near Jasper, Alberta, is used to reconstruct depositional environments in the vicinity of two former confluent valley glaciers. Sedimentation occurred mainly in the valley...
Journal Article
Published: 01 September 1978
Bulletin of Canadian Petroleum Geology (1978) 26 (3): 343–361.
.... This distinctive, recessive-weathering unit occurs throughout much of Jasper National Park and was previously referred to as "map-unit 3." The type section is located on the north spur of Chetamon Mountain 13 mi (21 km) north of Jasper, Alberta. The lithology, paleontology, distribution and correlation are briefly...
Journal Article
Published: 01 June 1978
Bulletin of Canadian Petroleum Geology (1978) 26 (2): 218–236.
...David R. Kobluk ABSTRACT Assemblages of stromatoporoid forms in an Upper Devonian reef complex (Miette reef, Jasper, Alberta), produced by grouping individual fossiliferous stratigraphic units on the basis of common populations of forms, may be used to reconstruct the reef on a two-dimensional...