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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 Danyushevsky
The 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 Systems

Editors

OV Frank-Kamenetskaya, EG Panova, DY Vlasov

Pagination

109-122

ISBN

978-3-319-24985-8

Department/School

School of Natural Sciences

Publisher

Springer International Publishing

Place of publication

Switzerland

Event title

5th International Symposium on Biogenic-Abiogenic Interactions in Natural and Anthropogenic Systems

Event Venue

Saint Petersburg, Russia

Date of Event (Start Date)

2014-10-20

Date of Event (End Date)

2014-10-22

Rights statement

Copyright 2016 Springer International Publishing Switzerland

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the earth sciences

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