Titania in Australian massive silcretes

R. A. Eggleton, G. Taylor

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Selected silcretes formed by cementation of stream sediments and having >90 wt% SiO2, have been examined optically and by scanning electron microscopy. Such silcretes have quartz framework grains cemented by a plasma of quartz and anatase. Both the plasma quartz and the anatase are euhedral where they line cavities in the silcrete. Such quartz is typically up to 5 µm in diameter; the anatase crystals are platy on (001) and 50–100 nm in diameter. Comparison of the SiO2, TiO2 and Zr content of 138 silcretes with that of 2345 Australian stream sediments suggests the source of titania in silcretes is endogenous. The morphology of the quartz and anatase leads to the conclusion that both precipitated in situ.

Original languageEnglish
Pages (from-to)1017-1026
Number of pages10
JournalAustralian Journal of Earth Sciences
Volume64
Issue number8
DOIs
Publication statusPublished - 17 Nov 2017

Fingerprint

titanium
anatase
quartz
fluvial deposit
silcrete
plasma
cementation
cavity
scanning electron microscopy
crystal

Cite this

Eggleton, R. A. ; Taylor, G. / Titania in Australian massive silcretes. In: Australian Journal of Earth Sciences. 2017 ; Vol. 64, No. 8. pp. 1017-1026.
@article{8a9445a5dcf8422bb7287ea3dcf19109,
title = "Titania in Australian massive silcretes",
abstract = "Selected silcretes formed by cementation of stream sediments and having >90 wt{\%} SiO2, have been examined optically and by scanning electron microscopy. Such silcretes have quartz framework grains cemented by a plasma of quartz and anatase. Both the plasma quartz and the anatase are euhedral where they line cavities in the silcrete. Such quartz is typically up to 5 µm in diameter; the anatase crystals are platy on (001) and 50–100 nm in diameter. Comparison of the SiO2, TiO2 and Zr content of 138 silcretes with that of 2345 Australian stream sediments suggests the source of titania in silcretes is endogenous. The morphology of the quartz and anatase leads to the conclusion that both precipitated in situ.",
keywords = "Anatase, dissolution, silcrete, titania",
author = "Eggleton, {R. A.} and G. Taylor",
year = "2017",
month = "11",
day = "17",
doi = "10.1080/08120099.2017.1338617",
language = "English",
volume = "64",
pages = "1017--1026",
journal = "AGSO Journal of Australian Geology and Geophysics",
issn = "0812-0099",
publisher = "Taylor and Francis Ltd.",
number = "8",

}

Titania in Australian massive silcretes. / Eggleton, R. A.; Taylor, G.

In: Australian Journal of Earth Sciences, Vol. 64, No. 8, 17.11.2017, p. 1017-1026.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Titania in Australian massive silcretes

AU - Eggleton, R. A.

AU - Taylor, G.

PY - 2017/11/17

Y1 - 2017/11/17

N2 - Selected silcretes formed by cementation of stream sediments and having >90 wt% SiO2, have been examined optically and by scanning electron microscopy. Such silcretes have quartz framework grains cemented by a plasma of quartz and anatase. Both the plasma quartz and the anatase are euhedral where they line cavities in the silcrete. Such quartz is typically up to 5 µm in diameter; the anatase crystals are platy on (001) and 50–100 nm in diameter. Comparison of the SiO2, TiO2 and Zr content of 138 silcretes with that of 2345 Australian stream sediments suggests the source of titania in silcretes is endogenous. The morphology of the quartz and anatase leads to the conclusion that both precipitated in situ.

AB - Selected silcretes formed by cementation of stream sediments and having >90 wt% SiO2, have been examined optically and by scanning electron microscopy. Such silcretes have quartz framework grains cemented by a plasma of quartz and anatase. Both the plasma quartz and the anatase are euhedral where they line cavities in the silcrete. Such quartz is typically up to 5 µm in diameter; the anatase crystals are platy on (001) and 50–100 nm in diameter. Comparison of the SiO2, TiO2 and Zr content of 138 silcretes with that of 2345 Australian stream sediments suggests the source of titania in silcretes is endogenous. The morphology of the quartz and anatase leads to the conclusion that both precipitated in situ.

KW - Anatase

KW - dissolution

KW - silcrete

KW - titania

UR - http://www.scopus.com/inward/record.url?scp=85023781120&partnerID=8YFLogxK

U2 - 10.1080/08120099.2017.1338617

DO - 10.1080/08120099.2017.1338617

M3 - Article

VL - 64

SP - 1017

EP - 1026

JO - AGSO Journal of Australian Geology and Geophysics

JF - AGSO Journal of Australian Geology and Geophysics

SN - 0812-0099

IS - 8

ER -