Multistage, magmatic and hydrothermal evolution of the Debert Lake Rare Earth Element (REE) prospect, Nova Scotia, Canada
department or school: Science, Irving K. Barber Faculty of (Okanagan)
department or school: Earth, Environmental and Geographic Sciences, Department of (Okanagan)
data provider: DSpace
degree campus: UBCO
creator: Ersay, Lutfi
issued: 2020-12-24T20:40:58Z
issued: 2020
related degree: Master of Science - MSc
degree grantor: University of British Columbia
description: The Debert Lake Rare Earth Element (REE) prospect shows high, potentially economic, rare metal concentrations but requires a multi-faceted approach to uncover the complex formative processes and resolve timing for the deposit. This study provides a genetic model for REE mineralization at Debert Lake based on whole-rock and mineral geochemistry, together with U-Pb radiometric dates from zircon and monazite. The Wentworth plutonic complex in the Cobequid Highlands is associated with the Debert Lake REE prospect and is composed of granites and gabbros and their volcanic equivalents. The anorogenic (A-type) Hart Lake-Byers Lake (HLBL) granites, dominated by feldspar, quartz, and interstitial arfvedsonite, host the prospect. They show appreciable rare metal mineralization with grades of 1.2 wt.% REE₂O₃, 3.4 wt.% ZrO₂, and 0.4 wt.% Nb₂O₅ in strongly altered samples. Episodic mineralization yielded distinct REE assemblages including Nb-oxide (pyrochlore and fergusonite) phases, chevkinite, zircon, thorite, monazite, and titanite, formed during multiple magmatic-to-hydrothermal stages in the rare-metal bearing granites. Zircon, as a persistent phase of the REE assemblages, occurs in all granites. In the REE-rich granite, REE mineralization is characterized by REE assemblage minerals displaying intergranular to interstitial textures. “Spongy” zircon grains occur in patchy domains reflecting late magmatic stage fluid interaction with primary minerals and concentration of Y, Th and Zr mobilized by the fluids. U-Pb dating of these zircons yields an age of 355 to 360 Ma, approximately coeval with igneous monazite crystallization, dated at 366 ± 5 Ma. These findings document an early, late-magmatic REE mineralization event. A subsequent pulse of post-magmatic hydrothermal mineralization associated with Zr-F-rich fluid complexes produced two zircon populations, dated at ~ 310 to 318 Ma, with unusual habits and atypical REE patterns that are interpreted to be of hydrothermal origin…
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/76909
note: MULTISTAGE, MAGMATIC AND HYDROTHERMAL EVOLUTION OF THE DEBERT LAKE RARE EARTH ELEMENT (REE) PROSPECT, NOVA SCOTIA, CANADA by Lutfi Ersay B.Sc. Mugla Sitki Kocman University, 2014 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE in THE COLLEGE OF GRADUATE STUDIES (Earth and Environmental Sciences) THE UNIVERSITY OF BRITISH COLUMBIA (Okanagan) December 2020 © Lutfi Ersay, 2020 ii The following individuals certify that they have read, and recommend to the College of Graduate Studies for acceptance, a thesis/dissertation entitled: Multistage, magmatic and hydrothermal evolution of the Debert Lake REE Prospect, Nova Scotia, Canada submitted by Lutfi Ersay in partial fulfillment of the requirements of the degree of Master of Science. Dr. John D. Greenough, Irving. K. Barber School of Arts and Sciences Supervisor Dr. Kyle P. Larson, Irving. K. Barber School of Arts and Sciences Supervisory Committee Member Dr. Yuan Chen, Irving. K. Barber School of Arts and Sciences Supervisory Committee Member Dr. Jarda Dostal, St. Mary’s University External Examiner iii ABSTRACT The Debert Lake Rare Earth Element (REE) prospect shows high, potentially economic, rare metal concentrations but requires a multi-faceted approach to uncover the complex formative processes and resolve timing for the deposit. This study provides a genetic model for REE mineralization at Debert Lake based on whole-rock and mineral geochemistry, together with U-Pb radiometric dates from zircon and monazite. The Wentworth plutonic complex in the Cobequid Highlands is associated with the Debert Lake REE prospect and is composed of granites and gabbros and their volcanic equivalents. The anorogenic (A-type) Hart Lake-Byers Lake (HLBL) granites, dominated by feldspar, quartz, and interstitial arfvedsonite, host the prospect. They show appreciable rare metal mineralization with grades of 1.2 wt.% REE2O3, 3.4 wt.% ZrO2, and 0.4 wt.% Nb2O5 in strongly altered samples. Epis…
has type: Thesis/Dissertation
date issued: 2021-02
is shown at: 10.14288/1.0395402
language: eng
degree discipline: Earth and Environmental Sciences
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
type: Text
identifier URI: http://hdl.handle.net/2429/76909