The Kekura gold deposit (76.2 t Au at 8.1 g/t) is situated in Western Chukotka, a region that hosts several Au, Ag, Cu, and Mo deposits and prospects. The Kekura deposit is related to the eponymous granite intrusion that is cut by porphyry dikes. The U-Pb zircon age of one of these dikes is 112 ± 1 Ma (2σ) that corresponds to the latest Aptian/earliest Albian. Both intrusion and dikes are hydrothermally altered and are cut by gold-quartz and molybdenite-quartz veins and stringers. Two molybdenite samples yield Re-Os model ages of 112.5 ± 0.6 and 112.3 ± 0.6 Ma (2σ). These Re-Os ages indicate the close temporal relationship between the molybdenite mineralization and the porphyry dikes. The age of the Kekura mineral system is similar to that of the post-collisional granitic plutons of the Anyui zone spatially scattered, between 140 and 210 km northwest of Kekura. We suggest that this temporal relationship may increase the likelihood of further discoveries of economic gold mineralization related to the currently underexplored Aptian post-collisional magmatic complexes of the Western Chukotka area.

中文翻译：

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俄罗斯楚科奇西部 Kekura 金矿床的最新 Aptian/早期 Albian 年龄：对碰撞后岩浆作用相关矿化的影响

Kekura 金矿床（76.2 吨金，8.1 克/吨）位于楚科奇西部，该地区拥有多个金、银、铜和钼矿床和前景。Kekura 矿床与被斑岩岩脉切割的同名花岗岩侵入体有关。这些岩脉之一的 U-Pb 锆石年龄为 112 ± 1 Ma (2σ)，对应于最新的 Aptian/最早的 Albian。侵入岩和岩脉都被热液蚀变，并被金石英和辉钼矿石英脉和纵梁切割。两个辉钼矿样品产生的 Re-Os 模型年龄分别为 112.5 ± 0.6 和 112.3 ± 0.6 Ma (2σ)。这些 Re-Os 年龄表明辉钼矿矿化与斑岩脉脉之间存在密切的时间关系。Kekura 矿物系统的年龄与空间分散的安伊带后碰撞花岗岩体的年龄相似，在 Kekura 西北 140 至 210 公里之间。我们认为，这种时间关系可能会增加进一步发现与西楚科奇地区目前未充分勘探的 Aptian 碰撞后岩浆复合体相关的经济金矿化的可能性。