Temporal consistency between granite evolution and tungsten mineralization in Huamei'ao, southern Jiangxi Province, China: Evidence from precise zircon U–Pb, molybdenite Re–Os, and muscovite 40Ar–39Ar isotope geochronology
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Molybdenite
Muscovite
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Wolframite
Radiometric dating
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Isochron dating
Metallogeny
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AbstractCentral Jilin Province lies along the eastern edge of the Xing–Meng orogenic belt of northeast China. At least 10 Mo deposits have been discovered in this area, making it the second-richest concentration of Mo resources in China. To better understand the formation and distribution of porphyry Mo deposits in the area, we investigated the geological characteristics of the deposits and applied zircon U–Pb and molybdenite Re–Os isotope dating to constrain the age of mineralization. Our new geochronological data show the following: the Jidetun Mo deposit yields molybdenite Re–Os model ages of 164.6–167.1 Ma, an isochron age of 168 ± 2.5 Ma, and a weighted mean model age of 165.9 ± 1.2 Ma; the Houdaomu Mo deposit yields molybdenite Re–Os model ages of 167.4–167.7 Ma, an isochron age of 168 ± 13 Ma, and a weighted mean model age of 167.5 ± 1.2 Ma; and the Chang'anpu Mo deposit yields a zircon U–Pb age for granodiorite porphyry of 166.9 ± 1.5 Ma (N = 16). These new age data, combined with existing molybdenite Re–Os dates, show that intense porphyry Mo mineralization was coeval with magmatism during the Middle Jurassic (167.8 ± 0.4 Ma, r > 0.999). The geotectonic mechanisms responsible for Mo mineralization were probably related to subduction of the Palaeo-Pacific plate beneath the Eurasian continent. Combining published molybdenite Re–Os and zircon U–Pb ages for northeast China, the Mo deposits are shown to have been formed during multiple events coinciding with periods of magmatic activity. We identified three phases of mineralization, two of which had several stages: the Caledonian (485–480 Ma); the Indosinian comprising the Early–Middle Triassic (248–236 Ma) and Late Triassic (226–208 Ma) stages; and the Yanshanian phase comprising the Early–Middle Jurassic (202–165 Ma), Late Jurassic–early Early Cretaceous (154–129 Ma), and Early Cretaceous (114–111 Ma) stages. Although Mo deposits formed during each phase/stage, most of the mineralization occurred during the Early–Middle Jurassic.Keywords: Re–Os and U–Pb geochronologyporphyry molybdenum depositsmineralization periodscentral Jilin Provincenortheast China AcknowledgementsWe thank the staff of the National Research Centre of Geoanalysis, Chinese Academy of Geological Sciences, and the State Key Laboratory of Continental Dynamics, Northwest University, Xi'an, China, for Re–Os and U–Pb zircon analysis dating. In particular, we express our gratitude to the reviewers for their critical reviews and excellent suggestions which provided for the improvement of this article. This work was jointly supported by the Project for Scientific and Technology Development (Grant No. 20100450), the National Natural Science Foundation of China (Grant No. 41172072), and the Chinese Geological Survey Programme (Grant No. [2010]01-26-06).
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Abstract The Yaogangxian tungsten deposit is located in the central part of the Nanling polymetallic metallogenic province. The orebodies occur as veins. Wolframite and molybdenite are the dominant ore minerals. Two samples were selected for molybdenite Re‐Os dating in order to elucidate the timing of mineralization. Re‐Os datings of molybdenite from quartz‐wolframite veins and disseminated in granite yield ages of 153±7 Ma and 163.2±4.2 Ma respectively. The results indicate that the Yaogangxian tungsten deposit is the product of large‐scale metallogenesis in the middle Yanshanian period in South China, and that the evolution from late magmatic to postmagmatic hypothermal mineralization occurred at about 10 Ma. The rhenium content of molybdenite in the Yaogangxian tungsten deposit suggests that the ore materials originated from the crust.
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At present,Re-Os isotopic dating of molybdenite is one of the direct ways to acquire the ore-forming age.Using TJA X-series ICP-MS,the authors dated five molybdenite samples collected from the Chilu molybdenum deposit and obtained model ages.The results show that the ore-forming age is about 105-106 Ma, quite close to the emplacement age of porphyritoid granite,adamellite and feldspar graphic granite(115±4 Ma, Rb-Sr isochron age),which are intimately related to the ore-forming processes in this area.This indicates that they are all products of late Yanshanian magmatism.The above outcome provides direct evidence not only for the research of late Yanshanian magmatism and mineralization in the Pucheng-Ningde NW-trending ore belt but also for the comparative study between the Pucheng-Ningde ore-forming belt and the Shanhang-Yuenxiao ore-forming belt,thus contributing to mineral exploration in these two belts.
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The Pa'nan deposit is a newly-discovered porphyry Mo deposit at the eastern edge of the ChongmudaNuri ore field in Shannan Prefecture of Tibet. According to field work, the vein-like monzonitic granite-porphyry related to mineralization intruded into the Paleocene granodiorite, resulting in strong molybdenite mineralization and hydrothermal alteration in the porphyry and the contact zone. The molybdenite mineralization was mainly related to the straight quartz vein where most molybdenite occurred with a minor impregnation in quartz veins near the surrounding rock. In this paper, direct Re-Os isotopic dating of molybdenites collected from the quartz-molybdenite veins in the Pa'nan porphyry Mo deposit was carried out, which yielded model ages ranging from 31.34 to 31.83 Ma, a weighted average age of 31.66± 0.22 Ma and an isochron age of 32.4± 1.5 Ma(MSWD= 1.5). The model ages and isochron age are consistent within the error range. Therefore the data represent the ore-forming age of the Pa'nan deposit, which is basically consistent with the previous studies whichsuggest that the mineralization of the Chongmuda-Nuri ore field occurred in Oligocene(30~ 23 Ma). These data indicate that the Pa'nan deposit had a similar deep dynamic progress to the other deposits in the ChongmudaNuri ore belt. Nevertheless, the metallogenic epoch of the Pa'nan porphyry deposit is slightly earlier than that of the other deposits in the Chongmuda-Nuri ore belt, suggesting that mineralization was probably started at ca.32 Ma and related to the delamination of post-collision thickened mantle lithosphere.
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