Abstract

Based on the zircons of the Priiskovy massif, the U-Pb method (SHRIMP-II) established a close Cenomanian age of amphibole granodiorites of the magnetite and ilmenite series (96.91 ± 0.88 and 96.5 ± 1.2 Ma). Based on a set of features (measurements of magnetic susceptibility, the magnetic fraction content, the composition of dark and magnetic minerals, the content of Fe²⁺ and Fe³⁺), significant differences in the magnetic characteristics of the intrusive rocks of the same age were established. Among the relatively homogeneous central ilmenite zone of the Sikhote–Alin Orogenic Belt, the local occurrence of magnetite rocks of the Priiskovy massif explains the distribution of deposits and ore occurrences of the studied ore site. All Sn ore deposits and occurrences the Priiskovy massif are located in the distribution zone of rocks of the ilmenite series (reducing conditions) and gold deposits and placers and manifestations of polymetallic mineralization—in the zone of rocks of the magnetite series (oxidizing conditions).

中文翻译：

---

Priiskovy 地块岩石形成的氧化还原条件及其成矿后果（南锡霍特-阿林，滨海边疆区）

摘要

根据 Priiskovy 地块的锆石，U-Pb 方法 (SHRIMP-II) 确定了磁铁矿和钛铁矿系列角闪石花岗闪长岩的接近塞诺曼期年龄（96.91 ± 0.88 和 96.5 ± 1.2 Ma）。基于一组特征（磁化率测量、磁性分数含量、深色和磁性矿物的成分、Fe ²⁺和 Fe ^3+的含量），确定了同一时代的侵入岩的磁性特征存在显着差异。在锡霍特-阿林造山带相对均质的中央钛铁矿带中，Priiskovy 地块局部出现的磁铁矿岩石解释了研究矿点的矿床分布和矿石产状。Priiskovy 地块的所有锡矿床和产状均位于钛铁矿系岩石分布区（还原条件），而金矿床和砂矿以及多金属矿化表现位于磁铁矿系岩石区（氧化条件）。