Evaluating the geochemistry and paired silicon and oxygen isotope record of quartz in siliceous rocks from the ~3 Ga Buhwa Greenstone Belt, Zimbabwe, a critical link to deciphering the Mesoarchean silica cycle

Brengman, Latisha Ashley; Fedo, Christopher M.; Whitehouse, Martin J.; Jabeen, Iffat; Banerjee, Neil R.

doi:10.1016/j.chemgeo.2021.120300

Cited by 3 publications

(1 citation statement)

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“…For siliceous formations of the Elmus structure, the Ce-anomaly falls within the range of 0.48-0.78; for similar rocks of the Koikari structure, it does not go beyond 0.65-0.70. Positive Eu-, Y-, Ho-anomalies are noted in hydrothermal formations [22,23]. In the studied formations, the content of holmium is at the level of its concentration in NASC, and yttrium is at the level of post-Archaean shales.…”

Section: Chemical (Wt%) and Trace Element (Mg/kg Or Ppm) Composition ...mentioning

confidence: 90%

The problem of the genesis of the Mesoarchean aluminosilicate rocks from the Karelian craton and their possible use as a quartz-feldspar raw material

Kondrashova¹,

Bubnova

Медведев

2022

PMI

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The article presents original data obtained in the study of the chemical and mineral compositions of the Late Archean aluminosilicate rocks (formerly called silicites) from the Koikari and Elmus structures of the Vedlozero-Segozero greenstone belt of the Karelian craton (Central Karelia). A comprehensive study of these formations revealed their complex genesis as a result of the late imposition of hydrothermal and metamorphic alteration on sedimentary and volcanic-sedimentary rocks of feldspar-quartz composition. Due to the superimposed metasomatic (temperature?) impact on feldspar-quartz siltstones, Fe was removed from microinclusions in quartz and feldspar and its oxides were concentrated along the grain boundaries. Minerals such as monazite, parisite, allanite are also located either along the grain boundaries of quartz and feldspars, or together with calcite they fill microfractures, which makes it possible to get rid of them when preparing quartz-feldspar concentrates using various beneficiation technologies. According to most indicators limited by GOSTs, individual samples in their natural form meet the requirements for quartz-feldspar raw materials for use as part of batch in the production of diverse types of glass. Additional beneficiation of the feedstock (grinding, screening into narrow classes and further magnetic separation) leads to a decrease in Fe2O3 content to normalized values. The resulting quartz-feldspar concentrates with various particle sizes can be used in the production of building material and fine ceramics (sanitary and ceramic products, facing and finishing tiles, artistic, household porcelain and faience). The homogeneity of the mineral and chemical composition, the possibility of compact extraction and beneficiation (including in mobile small-sized installations) increase the prospects and competitiveness of this non-traditional feldspar raw material from Central Karelia.

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Section: Chemical (Wt%) and Trace Element (Mg/kg Or Ppm) Composition ...mentioning

confidence: 90%