Re os dating sulfides
Silicic alteration locally occurred at the surface, while supergene argillic alteration overprinted the other alterations at shallow levels. Hydrothermal alteration types in the area include potassic, phyllic, and propylitic varieties. The mineralization is associated with a porphyry quartz-monzodiorite to quartz-diorite stock, which intruded into Eocene volcanic rocks consisting of andesite, basalt, and andesitic to dacitic tuff. AUTHORS:20170726-151335659 Full text is not posted in this repository. Use this Persistent URL to link to this item: AUTHORS:20170726-151335659The Chah-Firouzeh deposit with about 100 Mt ore reserves @ 0.5% Cu is a porphyry copper deposit located 14 km west of the Meiduk deposit in the northern section of the Kerman Cenozoic Magmatic Assemblage (KCMA), southeastern Iran.Mineralization occurs as quartz-sulfide veinlets and stockworks, as well as disseminations in the porphyry body and volcanic host rocks, in association with potassic and phyllic alteration.Hypogene minerals in the deposit include pyrite, chalcopyrite, magnetite, molybdenite, and bornite.Supergene enrichment is irregularly developed in the Chah-Firouzeh deposit.
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. 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. The calculated temperatures for sulfide pairs are compatible with those obtained from fluid inclusion microthermometry and show isotope equilibrium due to fluid evolution. Vijaya Kumar, Jamshid Hassanzadeh, Saeed Alirezaei, Holly J.
Sukhoi Log and Olympiada are the two largest orogenic gold deposits in Eurasia and some of the largest in the world, with resources of 96 Moz Au ( Migachev et al., 2008 ) and 60 Moz Au ( Wardell Armstrong, 2011 ), respectively. (2000) showed that the main metamorphism is early Paleozoic (516 ± 22 Ma), whereas their Rb–Sr dating of quartz from Sukhoi Log gave a middle Paleozoic (320 ± 16 Ma) age.Both deposits occur within the Neoproterozoic orogens at the southern and western periphery of the Siberian craton ( Fig. The opinion on age of gold mineralization at Sukhoi Log is currently ranging from Neoproterozoic ( Buryak, 1982; Buryak and Khmelevskaya, 1997 ) to middle Paleozoic ( Goldfarb et al., 2001; Laverov et al., 2000 ). Dating of granitoids ( Rundqvist et al., 1992 ) and alteration ( Goldfarb et al., 2001 ) revealed an age for both of 370–350 Ma.These ages are similar to the age of the large Barguzin batholiths, occupying most of Transbaikalia ( Kuz'min et al., 2006 ).The Tudun deposit is a medium-sized Cu–Ni sulfide deposit, located at the westernmost edge of the Huangshan–Jing’erquan Belt in the northern part of Eastern Tianshan, NW China.