Petrographic and Geochemical Characterization of Ore-bearing Intrusions of the Noril'sk type, Siberia; With Discussion of Their Origin, Including Additional Datasets and Core Logs
By Gerald K. Czamanske
U.S. Geological Survey Open-File Report 02-74
This report is preliminary and has not been reviewed for conformity with U.S.
Geological Survey (USGS) editorial standards or with the North American Stratigraphic
Code. Any use of trade, firm, or product names is for descriptive purposes only
and does not imply endorsement by the U.S. Government.
Abstract
The Noril'sk I, Talnakh, and Kharaelakh intrusions of the Noril'sk district host one of the outstanding metal concentrations in the world; contained Cu-Ni resources are comparable to the deposits at Sudbury, Ontario and the platinum group element (PGE) resource is second only to that of the Bushveld Complex. Our opportunity to cooperatively sample and study this district in Siberian Russia arose in 1990 through a memorandum of understanding between the U.S. Geological Survey and the former Ministry of Geology of the U.S.S.R. The world-class significance of these deposits and the possibility that understanding their geologic context, including construction of a credible "ore-deposit model," will lead to discovery of similar deposits elsewhere, inspired extensive studies of the ores, the mafic-intrusions which host them, and associated flood basalts.
Simplified geologic map of the Noril'sk-Talnakh district
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Contents
Resource_Geology - Directory containing the paper Petrographic and Geochemical Characterization of Ore-bearing Intrusions of the Noril'sk type, Siberia; With Discussion of Their Origin by Gerald K. Czamanske, Tatyana E. Zen'ko, Valeri A. Fedorenko, Lewis C. Calk, James R. Budahn, John H. Bullock Jr., Terry L. Fries, Bi-Shia W. King, and David F. Siems that was published in Resource Geology Special Issue, No. 18, 1-48, 1995. The file in this directory is:
Resource_Geology.pdf
Geochemistry_Tables - Directory containing expanded versions of Appendixes 1 and 2 from the Resource Geology paper. Presented are major-element data, extensive minor-element data, and Sr- and Pb-isotopic data corrected for 250 Ma. The whole-rock major-element analyses have been normalized to 100% volatile free, with all Fe as FeO. The files in this directory consist of:
Kharaelakh_KZ-1879.txt
Kharaelakh_KZ-1879.xls
Lower_Talnakh_SG-28.txt
Lower_Talnakh_SG-28.xls
Norilsk-1_NP-29.txt
Norilsk-1_NP-29.xls
Talnakh_KZ-1713.txt
Talnakh_KZ-1713.xls
Talnakh_KZ-1799.txt
Talnakh_KZ-1799.xls
The *.txt files are tab-delimited-ASCII files and the *.xls files are for Microsoft Excel.
Intrusion_Logs - Directory containing intrusion logs for the four cores: Kharaelakh_KZ-1879, Lower_Talnakh_SG-28, Norilsk-1_NP-29, and Talnakh_KZ-1713+1799. In addition to detailed representation of the internal lithologic stratigraphy of the four intrusions, these logs present critical major- and minor-element data, as well as Pb- and Sr-isotopic data.
The file in this directory is:
Intrusion_Logs.pdf
Intrusion_Logs_Zenko - Directory containing additional core logs for the ore-bearing intrusions of the Talnakh ore junction to indicate the variability of the lithologic sequence within them. These six pages are Figures 12, 13, and 14 in:
Zen'ko, T.E. and Czamanske, G.K., 1994, Tectonic controls on ore-bearing intrusions of the Talnakh ore junction: Position, morphology, and ore distribution. Internat. Geol. Rev., v. 36, p. 1033-1057.
The file in this directory is:
Intrusion_Logs_Zenko.pdf
Lower_Talnakh_Rock_Units - Directory containing a table showing characteristics of rocks of the Lower Talnakh intrusion (drill hole SG-28). See Tables 1 and 2 of Resource_Geology.pdf, above for clarification.
The file in this directory is:
Lower_Talnakh_rock_units.pdf
Supplementary_core_logs - Directory containing logs and tables for Kharaelakh_KZ-1879, Lower_Talnakh_SG-28, Noril'sk-1_NP-29, Talnakh_KZ-1713, and Talnakh_KZ-1799. Presented are data for olivine abundance and composition, as well as for whole-rock Cr and MgO contents and Pb- and Sr-isotopic compositions. These logs are presented at the same vertical scale to allow a better comparison of the intrusions. The contents of this directory consist of the file
Olivine.pdf (which includes logs and tables)
and the directory Tables_Full-oxide_dataset that contains the files:
Kharaelakh_KZ-1879.txt
Kharaelakh_KZ-1879.xls
Lower_Talnakh_SG-28.txt
Lower_Talnakh_SG-28.xls
Norilsk-1_NP-29.txt
Norilsk-1_NP-29.xls
Talnakh_KZ-1713.txt
Talnakh_KZ-1713.xls
Talnakh_KZ-1799.txt
Talnakh_KZ-1799.xls
The *.txt files are tab-delimited-ASCII files and the *.xls files are for Microsoft Excel.
Chromite_Olivine_Pairs - This directory contains analyses of chromite grains and their olivine hosts made by G.K. Czamanske and Lewis Calk in 1996 on the USGS JEOL microprobe in Menlo Park, California. Calculated analyses for the primary standards employed are included in the datasets. Due to circumstances beyond our control, interpretation and evaluation of these data were never carried out.
Analyses of chromite-olivine pairs were made for each of the samples of the ore-bearing intrusions in which chromite inclusions in olivine were recognized. Standard setups as follows -- for chromite: Mg and Al, synthetic MgAl2O4; Si, Cpx-1; Fe, Mn, Ti, Ni, and V, synthetic oxides; Cr, Tiebaghi chromite (Cr2O3, 60.5 wt%). For olivine: Si and Mg, San Carlos olivine (SiO2, 40.81 and MgO, 49.42 wt%); Fe, synthetic fayalite; Ca, Cpx-1; Mn and Ni, synthetic oxides. No correction of the V concentrations has been made for the presence of Ti. This correction has been found to be; V corrected = V measured - (0.00484 x wt% TiO2 measured).
Photomicrographic documentation and back-scattered electron images of all samples are available to anyone who elects to utilize these data. The full cooperation of Dr. Czamanske will be offered to such an individual.
The contents of this directory consist of the file
1_README.TXT that repeats the above explanation,
The directory Olivine that contains the files:
OLIVINE1.txt
OLIVINE1.xls
OLIVINE2.txt
OLIVINE2.xls
OLIVINE3.txt
OLIVINE3.xls
OLIVINE3B.txt
OLIVINE3B.xls
OLIVINE3C.txt
OLIVINE3C.xls
OLIVINE3PRZ.txt
OLIVINE3PRZ.xls
OLIVINE4.txt
OLIVINE4.xls
OLIVINE5.txt
OLIVINE5.xls
OLIVINE6.txt
OLIVINE6.xls
The directory Oxide that contains the files:
OXIDES1.txt
OXIDES1.xls
OXIDES2.txt
OXIDES2.xls
OXIDES3.txt
OXIDES3.xls
OXIDES4.txt
OXIDES4.xls
OXIDES5.txt
OXIDES5.xls
OXIDES6.txt
OXIDES6.xls
The *.txt files are tab-delimited-ASCII files and the *.xls files are for Microsoft Excel.
The file version_history.txt - gives dates and nature of initial release and any changes to this report.
For questions about the content of this report, email Gerald K. Czamanske (czamrandg@earthlink.net).
