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Sm-Nd dating of the giant Sullivan Pb-Zn-Ag deposit, British Columbia

Geology

By:
, , and
DOI: 10.1130/0091-7613(2000)28<751:SDOTGS>2.0.CO;2

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Abstract

We report here Sm and Nd isotope data for hydrothermal tourmalinites and sulfide ores from the giant Sullivan Pb-Zn-Ag deposit, which occurs in the lower part of the Mesoproterozoic Purcell (Belt) Supergroup. Whole-rock samples of quartz-tourmaline tourmalinite from the footwall alteration pipe yield a Sm-Nd isochron age of 1470 ± 59 Ma, recording synsedimentary B metasomatism of clastic sediments during early evolution of the Sullivan hydrothermal system. Data for variably altered (chloritized and/or albitized) tourmalinites from the hanging wall of the deposit, which are believed to have formed originally ca. 1470 Ma, define a younger 1076 ± 77 Ma isochron because of resetting of Sm and Nd isotopes during Grenvillian metamorphism. HCl leachates of bedded Pb-Zn ore yield a Sm-Nd isochron age of 1451 ± 46 Ma, which is consistent with syngenetic-exhalative mineralization ca. 1470 Ma; this age could also reflect a slightly younger, epigenetic hydrothermal event. Results obtained for the Sullivan deposit indicate that the Sm-Nd geochronometer has the potential to directly date mineralization and alteration in stratabound sulfide deposits that are not amenable to dating by other isotope methods.

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Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Sm-Nd dating of the giant Sullivan Pb-Zn-Ag deposit, British Columbia
Series title:
Geology
DOI:
10.1130/0091-7613(2000)28<751:SDOTGS>2.0.CO;2
Volume
28
Issue:
8
Year Published:
2000
Language:
English
Publisher:
Geological Society of America
Publisher location:
Boulder, CO
Description:
4 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geology
First page:
751
Last page:
754
Country:
Canada
State:
British Columbia