Abstract

The Komsomolsk tin-ore district is located along the Miao-Chan Ridge in the Middle Amur River area (Khabarovsk krai) within the Badzhal accretionary terrane of the Sikhote-Alin orogenic belt. This work presents new results of U–Pb zircon dating of tonalite from the Miao-Chan complex of the Silinka granite pluton (99.7 ± 1.1 Ma) and rhyolites of the lower part of the Kholdami Formation (98.4 ± 1.0 and 98.7 ± 1.2 Ma) from the northeastern part of the Komsomolsk district. The geochemical characteristics of the rocks studied show that granitoids of the Miao-Chan complex are I-type rocks and that synchronous rhyolites of the Kholdami Formation are highly aluminous and correspond to S-type rocks. New data on the composition and early Cenomanian age of the rocks make it possible to consider the ore-magmatic system of the Komsomolsk ore district as part of the previously identified Albian–Cenomanian igneous province of Pacific Asia.

中文翻译：

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共青城矿区（阿穆尔河中游地区）白垩纪火成岩U/Pb测年新结果

摘要

共青城锡矿区位于锡霍特-阿林造山带巴德扎尔增生地体内阿穆尔河中游地区（哈巴罗夫斯克边疆区）的妙陈山脊沿线。这项工作提出了对来自 Silinka 花岗岩体 Miao-Chan 杂岩 (99.7 ± 1.1 Ma) 和 Kholdami 组下部流纹岩 (98.4 ± 1.0 和 98.7 ± 1.2 Ma) 的英辉长岩进行 U-Pb 锆石定年的新结果。来自共青城地区的东北部。研究的岩石地球化学特征表明，Miao-Chan杂岩花岗岩类为I型岩石，而Kholdami组同步流纹岩为高铝质，对应于S型岩石。关于岩石成分和早期塞诺曼阶年龄的新数据使得将共青城矿区的矿石-岩浆系统视为先前确定的太平洋亚洲阿尔布-塞诺曼阶火成岩省的一部分成为可能。