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Mineralogy and geochemistry of metalliferous black slates in the okcheon metamorphic belt, Korea: a metamorphic analogue of black shales in the South China block

Content Provider	Springer Nature Link
Author	Jeong, Gi Young
Copyright Year	2006
Abstract	Metalliferous black slates, which were locally exploited for their low-quality coal, are distributed in the Late Proterozoic to Paleozoic Okcheon Metamorphic Belt (OMB) of the Korean Peninsula. The mineralogy of the fine matrix is dominated by either quartz–(Ba, V)–mica–graphite or Quartz-Ba-feldspar–graphite. Polycrystalline submillimeter ellipsoids and elongate lenses aligned along foliations and veinlets are scattered through the fine matrix. Both ellipsoids and veinlets include many minor minerals containing rare elements: titanite, apatite, allanite, rutile, polycrase, barite, uraninite, xenotime, armenite, zircon, molybdenite, and sphalerite. Large graphite–apatite ellipsoids (nodules) with widths of several centimeters also occur in the highly carbonaceous black slates. Goldmanite occurs locally as porphyroblasts. The maximum rare element contents are: Ba 9.7%, V 2.04%, Mo 0.13%, U 0.11%, Cr 0.33%, Cu 254 ppm, Ni 479 ppm, Zn 607 ppm, Y 255 ppm, platinum-group element (PGE) + Au 309 ppb, and carbon 57%. The occurrence of the black slates and their elemental abundances suggests that most of the rare elements were accumulated from seawater in an oxygen-poor environment. However, the high Ba content of the OMB black slates indicates some hydrothermal input into an organic-rich basin. Although metamorphism and multiple deformations prevent a direct temporal and spatial correlation, metal abundances and a close association with graphite–apatite nodules and low-quality coal suggest that the OMB black slates are metamorphosed analogues of the Early Cambrian Ba–V deposits hosted by the black shales in the South China Block.
Starting Page	469
Ending Page	481
Page Count	13
File Format	PDF
ISSN	00264598
Journal	Mineralium Deposita
Volume Number	41
Issue Number	5
e-ISSN	14321866
Language	English
Publisher	Springer-Verlag
Publisher Date	2006-05-24
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Black shale Korea Uranium Vanadium Barite Mineralogy Mineral Resources Geology
Content Type	Text
Resource Type	Article
Subject	Geophysics Economic Geology Geochemistry and Petrology

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