Massive chromatite occurs
commonly in ophiolite sequences, and in this document internet
access is given to unpublished ophiolitic chromite data from the
Bay of Islands ophiolite of Western Newfoundland and the
Thetford ophiolite of the Eastern Townships of Quebec. The
Bay of Islands data is derived from the Ph.D. thesis of Luca
Riccio (Riccio, Luca, 1976. Stratigraphy and Petrology of the
Peridotite-Gabbro component of the Western Newfoundland
Ophiolites. Ph.D. Thesis, University of Western Ontario, 265
p.), whereas the Thetford data is taken from the Hounours B.Sc.
thesis of Joanna Sharpe (Sharpe, Joanna L., 1983. Chromitite and
Associated Ultramafic Rocks, Black Lake, Quebec. Thesis, Honours
Bachelor of Science, University of Western Ontario, 73
p.). I hope eventually to include a discussion of an
important data set for the massive chromite units of the
so-called 'Ring of Fire' cumulate bodies of Northern Ontario,
that are currently being studied and described by Jordan
Laarman, a PhD student at Western University.
The 1977 paper by Church
and Riccio (Church, W.R. and Riccio, L. 1977.
Fractionation trends in the Bay of Islands ophiolite of
Newfoundland: polycyclic cumulate sequences in ophiolites and
their classification. CJES 14, 1156-1165) classified ophiolites
in terms of the crystallization sequences observed in ophiolites
in general, as well as the specific nature of the trends in
FeO/MgO ratio of both residual mantle and cumulate olivine,
clinpyroxene and spinel, and TiO2 in clinopyroxenes.
References:
Riccio, Luca 1976. Stratigraphy and Petrology of the
Peridotite-Gabbro component of the Western Newfoundland
Ophiolites. Ph.D. Thesis, University of Western Ontario, 265 p.
Church, W.R. and Riccio, L. 1977. Fractionation trends in the
Bay of Islands ophiolite of Newfoundland: polycyclic cumulate
sequences in ophiolites and their classification. CJES 14,
1156-1165.
http://instruct.uwo.ca/earth-sci/fieldlog/Chromitite/Riccio/church_riccio77.pdf
Sharpe, Joanna L., 1983. Chromitite and Associated Ultramafic
Rocks, Black Lake, Quebec. Thesis, Honours Bachelor of Science,
University of Western Ontario, 73 p.
http://instruct.uwo.ca/earth-sci/fieldlog/Chromitite/Sharpe/Sharpe_graded_chromititem.jpg
- graded chromitite ore at Black Lake, Thetford Mines, Quebec
Laarman, J.E., Barnett, R.L. and Duke, N.A. Preliminary results
on the geochemistry at the Black Label, Black Thor and Big Daddy
chromite deposit in the McFaulds Lake Greenstone Belt, Ontario.
TGI 3Section (44), 44-1 - 44-6.
Laarman, J.E., 2014. A detailed metallogenic study of the
McFaulds Lake chromite deposits, Northern Ontario. Ph.D.
(submitted). Western Ontario.
--------------------------------------------------------------------------------------------------
Map of the Bay of Islands ophiolite:
http://instruct.uwo.ca/earth-sci/fieldlog/Chromitite/Riccio/riccio_BOI.jpg
Detrital chromite in Ordovician
sediments underlying the Bay of Island ophiolite
http://instruct.uwo.ca/earth-sci/200a-001/ophiolite/chroclast.jpg
The stratigraphic arrangement of Mantle and
Cumulate sequences in the Bay of Islands ophiolite is
illustrated in:
http://instruct.uwo.ca/earth-sci/fieldlog/Chromitite/Riccio/Riccio_Fig24.jpg
and the sections in Riccio's thesis dealing
with chromite (thesis pages 181 to 195) have been scanned
(ricciop181-195.rtf) and can be accesses via the link:
http://instruct.uwo.ca/earth-sci/fieldlog/Chromitite/Riccio/ricciop181-195.rtf
(p. 181 C Spinels as Petrogenetic Indicators;
p. 191 D SUMMARY AND CONCLUSIONS)
The
following provides links to some of the Tables and Figures in
the thesis:
Figures
Riccio_Fig25.jpg -
C:\fieldlog\Canadapdfs\Laarman\Riccio\Riccio_Fig25.jpg
Ni v Fe/Mg atomic ratio in
olivines (annotated)
http://instruct.uwo.ca/earth-sci/fieldlog/Chromitite/Riccio/Riccio_Fig25.jpg
Riccio_Fig34Al_Cr_TivFeMg.jpg
C:\fieldlog\Canadapdfs\Laarman\Riccio\Riccio_Fig34
Al_Cr_TivFeMg.jpg Cr, Al, Ti,
Fe+3 versus Fe2+/Mg atomic ratio of spinels
http://instruct.uwo.ca/earth-sci/fieldlog/Chromitite/Riccio/Riccio_Fig34Al_Cr_TivFeMg.jpg
Riccio_Fig35FeMgOlvFeMgSp.jpg -
C:\fieldlog\Canadapdfs\Laarman\Riccio\Riccio_Fig35
FeMgOlvFeMgSp.jpg Fe/Mg olivine versus Fe2+/Mg spinel
and Fe2+/MgO spinel versus Temperature,
Olivine-Spinel geothermometer of Jackson (1969)
http://instruct.uwo.ca/earth-sci/fieldlog/Chromitite/Riccio/Riccio_Fig35FeMgOlvFeMgSp.jpg
------------------------------------------------------------------------------------------
Tables
riccio_app4Tab1.jpg /
riccio_app4Tab1a.jpg - Appendix 4 Table 1 Physical
characteristics and
nomenclature of disseminated spinels
riccio_app4Tab2.jpg /
riccio_app4Tab2a.jpg - Appendix 4 Table 2 Physical
characteristics and
nomenclature of massive spinels
riccio_chr_ap3tab4_231.jpg
- Appendix 3, p. 231, Table 4 Spinel analyses
http://instruct.uwo.ca/earth-sci/fieldlog/Chromitite/Riccio/riccio_chr_ap3tab4_231.jpg
riccio_chr_ap3tab4_232.jpg
- Appendix 3, p. 232, Table 4 Spinel analyses
http://instruct.uwo.ca/earth-sci/fieldlog/Chromitite/Riccio/riccio_chr_ap3tab4_232.jpg
riccio_chr_ap3tab4_233.jpg
- Appendix 3, p. 233, Table 4 Spinel analyses
http://instruct.uwo.ca/earth-sci/fieldlog/Chromitite/Riccio/riccio_chr_ap3tab4_233.jpg
riccio_chrm_descripT1a.jpg
- Appendix 4 Table 1 description
of disseminated spinels
http://instruct.uwo.ca/earth-sci/fieldlog/Chromitite/Riccio/riccio_chrm_descripT1a.jpg
riccio_chrm_descripT2a.jpg
- Appendix 4 Table 2
description of massive spinels
http://instruct.uwo.ca/earth-sci/fieldlog/Chromitite/Riccio/riccio_chrm_descripT2a.jpg
Riccio_P116Table7.rtf - Page 116, Table
7 Composition of adjacent grains of spinel and olivine and
calculated equililbrium temperatures for the Hare Bay and Bay of
Islands Upper Mantle Peridotite.
http://instruct.uwo.ca/earth-sci/fieldlog/Chromitite/Riccio/Riccio_P116Table7.rtf
Riccio_P187Table11.jpg - Page
187, Table 11 Composition of adjacent grains of spinel and
olivine and calculated equililbrium temperatures for the Hare
Bay and Bay of Islands Cumulates.
http://instruct.uwo.ca/earth-sci/fieldlog/Chromitite/Riccio/Riccio_P187Table11.jpg
The figure "Partial Melting"
versus "Fractionation" trends as evident in cumulate and
residual mantle spinels illustrates the variation in xAl2O4 v
xCr2O4 and FeO v MgO
(corners of rhomb are MgAl2O4,
FeAl2O4, MgCr2O4, FeCr2O4) can be accessed via the link:
http://instruct.uwo.ca/earth-sci/fieldlog/Chromitite/Riccio/Riccio_Fig36meltvfract.jpg
Partial fusion trends causes spinels
to lose XAl2O4 and increase XCr2O4, and to increase Fe relative
to Mg:
MgAl2O4 + CaMgSi2O6 + Mg2Si2O6 = CaAl2SiO6 + 2 Mg2SiO4
K = (Pl x Ol2 ) / MgAl2O4 x Cpx x Opx
the Lewis Hills fractionation trends start at
the same degree of partial melting as the Table Mountain, North
Arm, Blow Me Down Mnt trend but shows an immediate increase in
XAl2O4 towards spinels
with 55% MgAl2O4 and 0 XCr2O4, i.e. relatively Al enriched
compositions. The Table Mountain, North Arm, Blow Me Down Mnt
spinels trend initially towards FeCr2O4 but then turn towards
FeAl2O4 enriched compositions.
---------------------------------------------------------------------------------
Scanned material is archived in:
C:\fieldlog\Canadapdfs\Laarman\Riccio and
C:\fieldlog\Chromitite\Riccio - scanned text and data pages
The data is also archived at
http://instruct.uwo.ca/earth-sci/fieldlog/Chromitite/Riccio/
-----------------------------------------------------------------------------------------
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