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Porphyry Indicator Zircons (PIZ) and Geochronology of Magmatic Rocks from the Malmyzh and Pony Cu-Au Porphyry Ore Fields (Russian Far East)
Ore Geology Reviews ( IF 3.3 ) Pub Date : 2021-09-23 , DOI: 10.1016/j.oregeorev.2021.104491
O.V. Petrov 1 , A.I. Khanchuk 2 , V.V. Ivanov 2 , V.V. Shatov 1 , R. Seltmann 3 , A.V. Dolgopolova 3 , A.A. Alenicheva 1 , A.V. Molchanov 1 , A.V. Terekhov 1 , V.I. Leontev 1 , B.V. Belyatsky 1 , N.V. Rodionov 1 , S.A. Sergeev 1
Affiliation  

New data obtained by petrographical, geochemical and U-Pb geochronological studies of magmatic whole rock and zircon samples from the Malmyzh and Pony gold-copper porphyry ore fields are discussed. The trace elements distribution patterns (REE+Y, Hf, Ti, U, Th, Pb) in zircons have been measured by SIMS SHRIMP-IIe instrument in the same spots as for local U-Pb age dating. Geochronological data show a matching Cenomanian crystallization age of the Malmyzh and Pony magmatic rocks: 99-97 and 93 Ma, respectively. ∑REE in zircons from the Malmyzh granitoids varies from 217 to 1,158 ppm, Y – from 718 to 732 ppm, Hf – from 4,524 to 4,928 ppm, Ti – from 4.1 to 16.6 ppm, Pb – from 1.2 to 1.6 ppm, U – from 89 to 112 ppm, Th – from 58 to 76 ppm. Geochemical characteristics of zircons from the Pony monzodiorite-porphyry differ significantly from the Malmyzh granitoid zircons. Concentrations of most trace elements in the Pony zircons, especially LREE and MREE, as well as Y, Pb, U, Th, and Ti are two-three times higher than in zircons from the Malmyzh granitoids. Temperature of zircon crystallization of the Malmyzh granitoids revealed by «Ti in zircon» thermometer is estimated at 680-700°C, whereas temperature of zircon crystallization of the Pony monzodiorite-porphyry is approximately 784±15°C. Fertility assessment of magmatic rocks from the Malmyzh and Pony ore fields is based on geochemical characteristics of zircons like Eu/Eu* vs. Dy/Nd and Eu/Eu* vs. (Ce/Nd)/Y plots. These characteristics show that zircons from the Malmyzh granitoids fall into the field of fertile porphyry systems, whereas zircons from the Pony monzodiorite-porphyry plot within the field of barren suites. Comparative analysis of studied samples from the Malmyzh and Pony ore fields with magmatic rocks from porphyry deposits worldwide aids our understanding of the geodynamic framework of their formation and establishes links to adakitic granitoids generated under similar conditions. This result can be utilized during prognostic and metallogenic considerations not only within the limits of Sikhote-Alin territory but also within the whole Russian Far East region.



中文翻译:

Malmyzh 和 Pony Cu-Au 斑岩矿田(俄罗斯远东)的斑岩指示锆石 (PIZ) 和岩浆岩年代学

讨论了通过对来自 Malmyzh 和 Pony 金铜斑岩矿田的岩浆全岩和锆石样品进行岩石学、地球化学和 U-Pb 年代学研究而获得的新数据。用 SIMS SHRIMP-IIe 仪器在与当地 U-Pb 年龄定年相同的地点测量了锆石中的微量元素分布模式(REE+Y、Hf、Ti、U、Th、Pb)。地质年代学数据显示 Malmyzh 和 Pony 岩浆岩的匹配 Cenomanian 结晶年龄:分别为 99-97 和 93 Ma。来自 Malmyzh 花岗岩的锆石中的 ∑REE 从 217 到 1,158 ppm,Y – 从 718 到 732 ppm,Hf – 从 4,524 到 4,928 ppm,Ti – 从 4.1 到 16.6 ppm,Pb – 从 1.6 ppm 到 1 –。 89 至 112 ppm,Th – 58 至 76 ppm。Pony 二闪长斑岩中锆石的地球化学特征与 Malmyzh 花岗岩类锆石有显着差异。Pony 锆石中大多数微量元素的浓度,尤其是 LREE 和 MREE,以及 Y、Pb、U、Th 和 Ti 的浓度是 Malmyzh 花岗岩锆石的 2-3 倍。《锆石中的钛》温度计显示的 Malmyzh 花岗岩的锆石结晶温度估计为 680-700°C,而 Pony 二闪长斑岩的锆石结晶温度约为 784±15°C。Malmyzh 和 Pony 矿区岩浆岩的肥力评估基于锆石的地球化学特征,如 Eu/Eu* 和 Ti 比来自 Malmyzh 花岗岩的锆石高出两到三倍。《锆石中的钛》温度计显示的 Malmyzh 花岗岩的锆石结晶温度估计为 680-700°C,而 Pony 二闪长斑岩的锆石结晶温度约为 784±15°C。Malmyzh 和 Pony 矿区岩浆岩的肥力评估基于锆石的地球化学特征,如 Eu/Eu* 和 Ti 比来自 Malmyzh 花岗岩的锆石高出两到三倍。《锆石中的钛》温度计显示的 Malmyzh 花岗岩的锆石结晶温度估计为 680-700°C,而 Pony 二闪长斑岩的锆石结晶温度约为 784±15°C。Malmyzh 和 Pony 矿区岩浆岩的肥力评估基于锆石的地球化学特征,如 Eu/Eu*vs. Dy/Nd 和 Eu/Eu* vs. (Ce/Nd)/Y 图。这些特征表明,来自 Malmyzh 花岗岩的锆石属于富饶斑岩系统领域,而来自 Pony 二长闪长斑岩地块的锆石属于贫瘠套件领域。对来自 Malmyzh 和 Pony 矿区的研究样品与来自全球斑岩矿床的岩浆岩进行比较分析,有助于我们了解其形成的地球动力学框架,并建立与类似条件下产生的埃达克花岗岩的联系。该结果不仅可用于锡霍特-阿林地区范围内的预测和成矿考虑,还可用于整个俄罗斯远东地区。

更新日期:2021-09-23
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