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Evidence of Biogenic Activity in Quartz-Hematite Rocks of the Urals VMS Deposits
conference contribution
posted on 2023-05-23, 12:23 authored by Ayupova, NR, Maslennikov, VV, Sadykov, SA, Maslennikova, SP, Leonid DanyushevskyThe textural, mineralogical, and geochemical features of quartz-hematite rocks associated with Urals VMS deposits indicate that the tube microfossils are responsible for immobil ization and accumulation of chemical elements during precipitation of authigenic minerals. The cryStallization of authigen ic minerals is a result of submarine transfonnation of mixed hyaloclastitic, sulfide, and carbonate sediments and d iagenetic processes, which modify the mineralogy and geochemistry of sediments. The tube microfossils about 100 μm across and up to l mm long consist of the external rim made up of fine-disperse hematite or hematite-quaitz aggregates and of the internal channel filled with hematite and/or transparent quartz, fine-disperse hematite-qua11z aggregates, leucoxene, rare sulfides, apatite, Fe-chlorite, and Mn-calcite. The carbon isotopic composition of calcite from quartz-hematite rocks with nrbe microfossils (up to - 26.2 %.>) indicates its biogenic origin. The habitat conditions of the tube microfossils favored the mineral precipitation. The newly formed apatite, rutile, illite, monazite, dolomite, ankerite, siderite, monheimite, REE carbonates, ana1ase, leucoxene, Mn-oxides, 1itanomagne1ite, and hematitized framboidal pyrite are observed in qua1tz-hema1ite matrix with abundant tube organisms in contrast to quartz-hematite rocks free of tube microfossils. Biomorphic hematite contains high contents of Mn (up to 9393 ppm), As (up to 1872 ppm), V (up to 779 ppm), W (up to 1091 ppm), Mo (up to 40 ppm), and U (up to 8.68 ppm), which are indicative of biological mechanisms of accumulation and conservation of these metals in the system.
History
Publication title
Biogenic—Abiogenic Interactions in Natural and Anthropogenic SystemsEditors
OV Frank-Kamenetskaya, EG Panova, DY VlasovPagination
109-122ISBN
978-3-319-24985-8Department/School
School of Natural SciencesPublisher
Springer International PublishingPlace of publication
SwitzerlandEvent title
5th International Symposium on Biogenic-Abiogenic Interactions in Natural and Anthropogenic SystemsEvent Venue
Saint Petersburg, RussiaDate of Event (Start Date)
2014-10-20Date of Event (End Date)
2014-10-22Rights statement
Copyright 2016 Springer International Publishing SwitzerlandRepository Status
- Restricted