Geochemistry and mineralogy of trace and rare-earth elements In acidified estuarine dredge spoil and associated sulfidic drain sediments, South Yunderup, Western Australia

Nian Xu

Research output: ThesisDoctoral Thesis

Abstract

I investigated rare earth element (REE) behaviour and associations with iron, sulfide, and phosphate minerals both in the source (dredge spoil) and sink (adjacent sediment). REE mineralogy and geochemistry were examined using bulk composition and electron microscopy. REE-Phosphate minerals such as florencite and monazite (possibly reflecting anthropogenic phosphate inputs) control REE geochemistry not iron as previously thought. A novel occurrence for REEs is discrete La2O3 phases coprecipitated, or coating surfaces of, Fe oxyhydroxides at nanometer scales. Lanthanum coprecipitation with mackinawite (FeS) is more likely than adsorption.
LanguageEnglish
QualificationDoctor of Philosophy
Awarding Institution
  • The University of Western Australia
Supervisors/Advisors
  • Rate, Andrew, Supervisor
  • Morgan, Bree, Supervisor, External person
  • Leopold, Matthias, Supervisor
Thesis sponsors
Award date30 Jan 2018
DOIs
StateUnpublished - 2018

Fingerprint

dredge spoil
drain
mineralogy
rare earth element
geochemistry
sediment
phosphate
mackinawite
iron sulfide
monazite
mineral
electron microscopy
coating
adsorption
iron

Cite this

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title = "Geochemistry and mineralogy of trace and rare-earth elements In acidified estuarine dredge spoil and associated sulfidic drain sediments, South Yunderup, Western Australia",
abstract = "I investigated rare earth element (REE) behaviour and associations with iron, sulfide, and phosphate minerals both in the source (dredge spoil) and sink (adjacent sediment). REE mineralogy and geochemistry were examined using bulk composition and electron microscopy. REE-Phosphate minerals such as florencite and monazite (possibly reflecting anthropogenic phosphate inputs) control REE geochemistry not iron as previously thought. A novel occurrence for REEs is discrete La2O3 phases coprecipitated, or coating surfaces of, Fe oxyhydroxides at nanometer scales. Lanthanum coprecipitation with mackinawite (FeS) is more likely than adsorption.",
keywords = "rare earth element, Acid sulfate soil, dredge spoil, Sediment, iron sulfides, trace elements",
author = "Nian Xu",
year = "2018",
doi = "10.4225/23/5a7bfb924a9b5",
language = "English",
school = "The University of Western Australia",

}

TY - THES

T1 - Geochemistry and mineralogy of trace and rare-earth elements In acidified estuarine dredge spoil and associated sulfidic drain sediments, South Yunderup, Western Australia

AU - Xu,Nian

PY - 2018

Y1 - 2018

N2 - I investigated rare earth element (REE) behaviour and associations with iron, sulfide, and phosphate minerals both in the source (dredge spoil) and sink (adjacent sediment). REE mineralogy and geochemistry were examined using bulk composition and electron microscopy. REE-Phosphate minerals such as florencite and monazite (possibly reflecting anthropogenic phosphate inputs) control REE geochemistry not iron as previously thought. A novel occurrence for REEs is discrete La2O3 phases coprecipitated, or coating surfaces of, Fe oxyhydroxides at nanometer scales. Lanthanum coprecipitation with mackinawite (FeS) is more likely than adsorption.

AB - I investigated rare earth element (REE) behaviour and associations with iron, sulfide, and phosphate minerals both in the source (dredge spoil) and sink (adjacent sediment). REE mineralogy and geochemistry were examined using bulk composition and electron microscopy. REE-Phosphate minerals such as florencite and monazite (possibly reflecting anthropogenic phosphate inputs) control REE geochemistry not iron as previously thought. A novel occurrence for REEs is discrete La2O3 phases coprecipitated, or coating surfaces of, Fe oxyhydroxides at nanometer scales. Lanthanum coprecipitation with mackinawite (FeS) is more likely than adsorption.

KW - rare earth element

KW - Acid sulfate soil

KW - dredge spoil

KW - Sediment

KW - iron sulfides

KW - trace elements

U2 - 10.4225/23/5a7bfb924a9b5

DO - 10.4225/23/5a7bfb924a9b5

M3 - Doctoral Thesis

ER -