scholarly journals Lead isotope data for galenas from deposits in the Bulkley Valley region, British Columbia

1972 ◽  
Author(s):  
R V Kirkham ◽  
R I Thorpe
Keyword(s):  
British Columbia ◽  
Lead Isotope ◽  
Isotope Data

Mixing line isochrons; a new interpretation of galena lead isotope data from southeastern British Columbia

1984 ◽  
Vol 79 (5) ◽  
pp. 919-932 ◽  
Author(s):  
Anne Andrew ◽  
Colin I. Godwin ◽  
Alastair J. Sinclair
Keyword(s):  
British Columbia ◽  
Lead Isotope ◽  
Isotope Data ◽  
New Interpretation

Interpretation of lead isotope data from zinc–lead mineralization in the northern part of the western Canadian Cordillera

1982 ◽  
Vol 19 (5) ◽  
pp. 1070-1078 ◽  
Author(s):  
D. W. Morrow ◽  
G. L. Cumming
Keyword(s):  
British Columbia ◽  
Lead Isotope ◽  
Isotope Composition ◽  
Canadian Cordillera ◽  
Pb Isotope ◽  
Linear Arrays ◽  
Group Of Seven ◽  
Isotope Data ◽  
Devonian Shale ◽  
Linear Trends

Lead isotope data, from a group of seven zinc–lead deposits in Devonian carbonate strata of northeastern British Columbia, have very radiogenic and variable compositions and form a series of parallel linear arrays on Pb/Pb diagrams. These arrays are entirely separate from the less radiogenic and much less variable lead compositions of the Devonian shale-hosted zinc–lead deposits in the laterally adjacent Paleozoic basinal sequence, which themselves define steeply dipping linear trends. Both of these types of arrays reflect multistage histories during the evolution of Pb compositions. One stage may have been a period of residence of Pb in uranium-rich Paleozoic shale, which caused the development of the radiogenic leads that were emplaced later in the carbonate-hosted zinc–lead deposits.Unlike the Devonian carbonate-hosted deposits the "Silver-rich vein" group of deposits is homogeneous in Pb isotope composition. This contrast in the isotopic homogeneity between deposits may reflect differences in the mechanisms by which these deposits formed.

Lead isotope analyses from Tell Abraq, United Arab Emirates: new data regarding the ‘tin problem’ in Western Asia

Antiquity ◽  
1999 ◽  
Vol 73 (279) ◽  
pp. 49-64 ◽  
Author(s):  
Lloyd Weeks
Keyword(s):  
United Arab Emirates ◽  
Lead Isotope ◽  
Isotope Data ◽  
Western Asia ◽  
Tell Abraq ◽  
New Research ◽  
Isotope Analyses

The ‘tin problem’ forms the focus for discussion on the earliest use of tin and bronze in western Asia and the Aegean. New research on lead isotope data from Tell Abraq in the UAE has important implications for the advent of bronze in the region.

Lead-isotope study of mineralization in the Cobalt district, Ontario

1986 ◽  
Vol 23 (10) ◽  
pp. 1568-1575 ◽  
Author(s):  
R. I. Thorpe ◽  
M. D. Goodz ◽  
I. R. Jonasson ◽  
J. Blenkinsop
Keyword(s):  
Lead Isotope ◽  
Sedimentary Rocks ◽  
Time Range ◽  
Two Stage ◽  
Metal Source ◽  
Genetic Link ◽  
Isotope Data ◽  
Isotope Study ◽  
Homogeneous Composition ◽  
Isotope Analyses

Twenty-seven lead-isotope analyses for galena specimens from 14 localities in the Cobalt district represent sulphide-rich interflow sedimentary units in the Archean volcanic sequence, mineralized zones, fracture fillings, and local sulphide concentrations in the Cobalt Group (Proterozoic) sedimentary rocks, and vein-filling and breccia-cementing sulphides from within and near silver–arsenide veins. The analyses define a very homogeneous composition, averaging 206Pb/204Pb = 14.732, 2O7Pb/204Pb = 15.114, and 208Pb/204Pb = 34.301, for lead from these different geological settings. This result is in agreement with textural observations indicating a late paragenetic position for galena in the different settings mentioned. The model age for this lead is in general accord with the U–Pb age obtained in a study by Andrews et al. for a Nipissing diabase sheet at Gowganda.About one third of the galena specimens are interpreted by a two-stage evolution model to have formed or been remobilized during an event in the time range 1650–1945 Ma. The timing and character of this event are not clearly defined. The radiogenic composition of a specimen from the Pan Silver property is comparable to radiogenic values reported by Thorpe and suggests a young galena-forming event in the area.The lead-isotope data are permissive evidence for a genetic link between the Nipissing diabase sheets and mineralization of a variety of types in the Cobalt district. The metal source is not clearly indicated, but one analysis for Archean interflow sulphides suggests than an Archean source is unlikely for the lead in the silver–arsenide veins and other mineralized zones.

Sample Size and Related Issues in the Analysis of Lead Isotope Data

2000 ◽  
Vol 27 (10) ◽  
pp. 973-980 ◽  
Author(s):  
M.J. Baxter ◽  
C.C. Beardah ◽  
S. Westwood
Keyword(s):  
Sample Size ◽  
Lead Isotope ◽  
Isotope Data

LEAD ISOTOPE DATA FROM THE ISOTRACE LABORATORY, OXFORD: ARCHAEOMETRY DATA BASE 1, ORES FROM THE WESTERN MEDITERRANEAN

Archaeometry ◽  
1995 ◽  
Vol 37 (2) ◽  
pp. 407-415 ◽  
Author(s):  
Z. STOS-GALE ◽  
N. H. GALE ◽  
J. HOUGHTON ◽  
R. SPEAKMAN
Keyword(s):  
Data Base ◽  
Lead Isotope ◽  
Western Mediterranean ◽  
Isotope Data

A re-assessment of the Upper Mississippi valley lead isotope data

1972 ◽  
Vol 7 (3) ◽  
pp. 285-291 ◽  
Author(s):  
J. R. Richards ◽  
A. K. Yonk ◽  
C. W. Keighin
Keyword(s):  
Lead Isotope ◽  
Mississippi Valley ◽  
Isotope Data
Sign in / Sign up

Export Citation Format

Share Document