Minerals in the Triassic carbonaceous silicites of Sikhote Alin


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Over 60 minerals, including native elements, intermetallic compounds, haloids, sulfides, sulfates, arsenides, oxides and hydroxides, silicates, borosilicates, wolframates, phosphates and REE phosphates, were established in Triassic siliceous rocks of Sikhote Alin. Allothigenic and authigenic minerals in the carbonaceous silicites were formed over a long period through several stages. Judging from morphology, chemical composition, and structural position, K-feldspar (K-Fsp), illite, kaolinite, metahalloysite, monazite, xenotime, zircon, rutile, or its polymorphs are the disintegration products of sialic rocks of continental crust. Authigenic sulfides are dominated by diagenetic pyrite (fine-crystalline, microglobular, framboidal, as well as those developed after biogenic siliceous and carbonate fragments), which has been formed prior to precipitation of siliceous cement and lithification of siliceous rocks. Most of other sulfides (sphalerite, galena, chalcopyrite, pyrrhotite, argentite, pentlandite, antimonite, ulmanite, and bravoite), arsenides and sulfoarsenides (arsenopyrite, nickeline, skutterudite, cobaltite, glaucodot, and gersdorffite), wolframates (scheelite and wolframite), intermetallides (Cu2Zn, Cu3Zn2, Cu3Zn, Cu4Zn, CuSn, Cu4Sn, Cu8Sn, Cu4Zn2Ni, Ni2Cu2Zn, Ni4Cd), and native elements (Au, Pd, Ag, Cu, Fe, W, Ni, Se) were crystallized later (during catagenesis after the lithification and brecciation of siliceous beds) from metals involved in the easily mobile fractions of bitumens. Supergene mineral formation was mainly expressed in the sulfide oxidation and replacement of diagenetic pyrite by jarosite and iron hydroxides.

作者简介

Yu. Volokhin

Far East Geological Institute, Far East Branch

编辑信件的主要联系方式.
Email: yvolokhin@mail.ru
俄罗斯联邦, pr. Stoletiya Vladivostoka 159, Vladivostok, 690022

A. Karabtsov

Far East Geological Institute, Far East Branch

Email: yvolokhin@mail.ru
俄罗斯联邦, pr. Stoletiya Vladivostoka 159, Vladivostok, 690022

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