Gold Deposits and Their δ<SUP>34</SUP>S Ratios of the Sikhote-Alin, Russia

ISHIHARA Shunso, IVANOV V.V., RATKIN Vladimir

doi:10.11456/shigenchishitsu1992.46.267

In Sikhote Alin, mesothermal gold deposits are mostly associated with small Cretaceous intrusives and epithermal deposits with Paleogene volcanic rocks. They are mostly quartz vein or veinlet types, but some occur in faulted sheared zone. Common alteration minerals are quartz, sericite, carbonates and chlorite. Tourmaline and fluorite are rarely present. Native gold and electrum occur associated mostly with chalcopyrite, pyrite, galena and sphalerite, and less commonly with arsenopyrite and other sulfides. Pyrrhotite is present in some places. Epithermal ores are rich in different Ag minerals. Adularia is not uncommon in these ore deposits; thus, they are generally low sulfidation type.<BR>δ³⁴S of these ore minerals vary from -9.3 to 5.1 permil, but nagative values are predominant, indicating that ilmenite-series granitoids are present much more than magnetite-series graitoids in the Sikhote Alin. Late Cretaceous mesothermal deposits have wider variation in the δ³⁴S values than Paleogene epithermal deposits. In the largest Mnogovershinnoe epithermal deposits, sulfides from Au-bearing ores (average -5.4‰) are 3.6 permil lower than those of Au-free ores. Because of scarcity of positive δ³⁴S values, the paired δ³⁴S values of the Inner Zone of Southwest Japan are not observed in the Sikhote Alin side. Late Cretaceous granitic magmatisms and mineralizations in the Sikhote Alin have some similarity to those of the Sanyo Belt, but gold deposits are much abundant in the Sikhote Alin side, and are quite different from those of the Gyeongsang basin in Korea and Fujian coastal province in China.

Gold Deposits and Their δ<SUP>34</SUP>S Ratios of the Sikhote-Alin, Russia

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