Abstract

The activity of polyvalent elements in the geochemical processes is to a considerable extent determined by the valence state. A change in the valence is dependent on many factors, but the redox conditions of the medium where magma is generated are considered the main factor. The ratio between divalent and trivalent iron in magmatic rocks is a reliable and an accessible indicator of the redox conditions that determine a whole set of mineralogical, geochemical and physical parameters including ferruginosity of dark-colored minerals, the ore mineral (magnetite–ilmenite) composition, the weight of the ore fraction, and magnetic susceptibility. Based on the above parameters, the zones are distinguished where magmatic rocks of the magnetite and ilmenite series are developed in the Sikhote Alin Orogenic Belt. All known tin and tungsten deposits and occurrences in the Sikhote Alin are confined to the ilmenite series (the axial zone of the belt). The ilmenite rock series are framed by the magmatic rocks of the magnetite series; the epithermal gold–silver and copper–porphyry deposits are associated with these rocks.

中文翻译：

---

锡科特阿林造山带岩浆岩的氧化还原条件及相关的地球化学和成矿带

摘要

在地球化学过程中，多价元素的活性在很大程度上取决于化合价态。化合价的变化取决于许多因素，但是产生岩浆的介质的氧化还原条件被认为是主要因素。岩浆岩中二价铁和三价铁的比率是氧化还原条件的可靠且可访问的指标，氧化还原条件决定了整套矿物学，地球化学和物理参数，包括深色矿物的铁素体性，矿石矿物（磁铁矿-钛铁矿）的组成，矿石级分的重量和磁化率。根据以上参数，区分了锡克霍特阿林造山带中磁铁矿和钛铁矿系列岩浆岩发育的区域。Sikhote Alin中所有已知的锡和钨沉积物和矿床都限于钛铁矿系列（带的轴向区域）。钛铁矿岩石系列由磁铁矿系列的岩浆岩石构架。这些岩石与超热的金-银和铜-斑岩矿床有关。