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Evidence of Biogenic Activity in Quartz-Hematite Rocks of the Urals VMS Deposits

Citation

Ayupova, NR and Maslennikov, VV and Sadykov, SA and Maslennikova, SP and Danyushevsky, LV, Evidence of Biogenic Activity in Quartz-Hematite Rocks of the Urals VMS Deposits, Biogenic Abiogenic Interactions in Natural and Anthropogenic Systems, 20-22 October 2014, Saint Petersburg, Russia, pp. 109-122. ISBN 978-3-319-24985-8 (2016) [Refereed Conference Paper]

Copyright Statement

Copyright 2016 Springer International Publishing Switzerland

DOI: doi:10.1007/978-3-319-24987-2_10

Abstract

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.

Item Details

Item Type:Refereed Conference Paper
Keywords:tube microfossils, quartz-hematite rocks, authigenic minerals, trace elements, VMS deposits
Research Division:Earth Sciences
Research Group:Geology
Research Field:Igneous and Metamorphic Petrology
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Earth Sciences
Author:Danyushevsky, LV (Professor Leonid Danyushevsky)
ID Code:119604
Year Published:2016
Web of Science® Times Cited:2
Deposited By:CODES ARC
Deposited On:2017-08-03
Last Modified:2017-10-05
Downloads:0

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