Variation of molybdenum isotopes in molybdenite from porphyry and vein Mo deposits in the Gangdese metallogenic belt, Tibetan plateau and its implications

From National Research Council Canada

DOIResolve DOI: https://doi.org/10.1007/s00126-015-0602-3
AuthorSearch for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: 1; Search for:
Name affiliation
  1. National Research Council of Canada. Measurement Science and Standards
FormatText, Article
Journal titleMineralium Deposita
ISSN0026-4598
1432-1866
Volume51
Issue2
Pages201–210
SubjectMolybdenite; Molybdenum isotope; Gangdese; Tibetan Plateau
Abstract
We present Mo isotopic ratios of molybdenite from five porphyry molybdenum deposits (Chagele, Sharang, Jiru, Qulong, and Zhuonuo) and one quartz-molybdenite vein-type deposit (Jigongcun) along the Gangdese metallogenic belt in the Tibetan Plateau. These deposits represent a sequence of consecutive events of the India-Asia collision at different periods. Additional molybdenite samples from the Henderson Mo deposit (USA), the oceanic subduction-related El Teniente (Chile), and Bingham (USA) porphyry Cu-(Mo) deposits were analyzed for better understanding the controls on the Mo isotope systematics of molybdenite. The results show that molybdenite from Sharang, Jiru, Qulong, and Zhuonuo deposits have similar δ⁹⁷Mo (∼0 ‰), in agreement with the values of the Henderson Mo deposit (−0.10 ‰). In contrast, samples from the Changle and Jigongcun deposit have δ⁹⁷Mo of 0.85 ‰ to 0.88 ‰ and −0.48 %, respectively. Molybdenite from the El Teniente and Bingham deposits yields intermediate δ⁹⁷Mo of 0.27 and 0.46 ‰, respectively. The Mo isotopes, combined with Nd isotope data of the ore-bearing porphyries, indicate that source of the ore-related magmas has fundamental effects on the Mo isotopic compositions of molybdenite. Our study indicates that molybdenite related to crustal-, and mantle-derived magmas has positive or negative δ⁹⁷Mo values, respectively, whereas molybdenite from porphyries formed by crust-mantle mixing has δ⁹⁷Mo close to 0 ‰. It is concluded that the Mo isotope composition in the porphyry system is a huge source signature, without relation to the tectonic setting under which the porphyry deposits formed.
Publication date
PublisherSpringer International Publishing
LanguageEnglish
Peer reviewedYes
Identifier602
NPARC number23000297
Export citationExport as RIS
Report a correctionReport a correction
Record identifier076f3af1-a5a4-4724-9891-2c9c9b373e16
Record created2016-07-05
Record modified2020-04-22
Report a problem on this page
Date modified: