Sm-Nd dating of the giant Sullivan Pb-Zn-Ag deposit, British Columbia
Geology
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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.
Suggested Citation
Jiang, S., Slack, J.F., Palmer, M.R., 2000, Sm-Nd dating of the giant Sullivan Pb-Zn-Ag deposit, British Columbia: Geology, v. 28, no. 8, p. 751-754, https://doi.org/10.1130/0091-7613(2000)28<751:SDOTGS>2.0.CO;2.
Study Area
| 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 |
| Contributing office(s) | Eastern Mineral and Environmental Resources Science Center |
| 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 |