Re os dating sulfides

Comments and suggestions from Wen Jiao Xiao, anonymous reviewers and Editor-in-Chief Prof.

Wolf–Christian Dullo greatly improved the quality of the paper.

Molybdenite Re–Os dating on two samples separated from “B and D type” veinlets show that mineralization occurred at 16.60 ± 0.06 Ma and 15.99 ± 0.06 Ma, implying a time span of about 0.6 Ma for mineralization.

The δ^(34)S values for molybdenite, chalcopyrite, and pyrite from “A, B, and D type” veinlets vary from −1.4 to 2.5‰ suggesting a magmatic source for sulfur.

Two modes of occurrence of molybdenite are observed in the Escondida deposit: aggregates with Cu-Fe-sulfide minerals in fine veinlets (sulfide-veinlet type), and monomineralic microveinlets associated with NE-trending faults.

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The U–Pb monazite and zircon data from their Sukhoi Log study support the Re–Os modeling we performed in our pilot study.

The Early-Middle Miocene epoch marks the most important period of porphyry Cu mineralization in the KCMA. Babu, Zircon U–Pb and molybdenite Re–Os geochronology, with S isotopic composition of sulfides from the Chah-Firouzeh porphyry Cu deposit, Kerman Cenozoic arc, SE Iran, Ore Geology Reviews, Volume 88, 2017, Pages 384-399, ISSN 0169-1368,

During this period, many adakitic magmas intruded the Eocene volcano-sedimentary sequences and formed some of the largest porphyry copper deposits in Iran, such as Sarcheshmeh and Meiduk.

The Tudun deposit shares the same age and Re–Os isotopic compositions with other orthomagmatic Cu–Ni sulfide deposits in Huangshan–Jing’erquan Belt, suggesting that they have formed in Early Permian.

This study was supported by grants from the National Natural Science Foundation of China (No. 12120114016601), the Special Fund for Basic Scientific Research of Central Colleges, China University of Geosciences (Wuhan) (No.

The Re-Os age data combined with those of the porphyry emplacement suggest that the molybdenite mineralization in the Escondida district occurred as several short episodic pulses during the late-magmatic to hydrothermal transition, and that the Cu-Mo deposits were formed in a variable overall period spanning 1 to 5 m.y.

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