Relict sulfides in terrigenous rocks of the Upper Kolyma Region |
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| Authors: | E E Tyukova A V Volkov A A Sidorov |
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| Institution: | (1) Federal Institute for Geosciences and Natural Resources (BGR), Stilleweg 2, 30655 Hannover, Germany;(2) Present address: ARC National Key Centre for Geochemical Evolution and Metallogeny of Continents (GEMOC), Department of Earth and Planetary Sciences, Macquarie University, Sydney, Australia; |
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| Abstract: | In terrigenous flysch strata of the Upper Kolyma Region in northeastern Russia, microaggregates of sulfides with spherical
form are widespread. During dynamic metamorphism, spherical sulfide units were segregated into lenticular aggregates along
the cleavage planes, were as seed, or were recrystallized into faceted metacrystals. Further stress on the rock sometimes
led to a morphologically expressed particular dissolution of pyrite crystals along the cleavage directions, and to their depletion
with admixture elements. A more substantial effect led to transformation of pyrite into pyrrotine with inclusions of chalcopyrite
and Fe-Ni-Co-sulfoarsenides. Relict sulfides reflect, to a certain degree, the primary geochemical condition of the sedimentation
period and its further evolution. When studying the numerous sulfidization zones, the composition of relict sulfides allows
us to predict the geochemical specialization and the degree of inheritance of post-sedimentation mineralization. |
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