The Mantle Source of the 2.7 Ga Fe-rich Qullinaaraaluk Intrusion (NE Superior Craton) inferred through long- and short-lived Sm-Nd Systematics
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To provide insight into the Fe-enriched mantle domains that may be the source of ferropicrites, we present a coupled 147Sm-143Nd and 146Sm-142Nd study of the Neoarchean Fe-enriched Qullinaaraaluk intrusion (NESP). An isochron yields an age of 2706 ± 29 Ma, which is interpreted to be the crystallization age of the intrusion. Accounting for the effects of crustal contamination, the initial Ɛ 143Nd values range from -0.39 to +1.26. High-precision measurements of 142Nd/144Nd ratios yield an average μ142Nd of -0.4 ± 5.5, revealing no deviation from the terrestrial standard. The absence of μ142Nd anomaly indicates that the Qullinaaraaluk mantle source does not have a Hadean-formed component. Time-integrated 147Sm/144Nd ratios between 0.1944-0.2012 suggest derivation from a mantle source more enriched than the present-day depleted mantle. Similarities between the initial Ɛ 143Nd of the Qullinaaraaluk intrusion and Superior province ferropicrites indicates that their Fe-enriched mantle source may share a similar history.
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Copyright © 2022 the author(s). Theses may be used for non-commercial research, educational, or related academic purposes only. Such uses include personal study, research, scholarship, and teaching. Theses may only be shared by linking to Carleton University Institutional Repository and no part may be used without proper attribution to the author. No part may be used for commercial purposes directly or indirectly via a for-profit platform; no adaptation or derivative works are permitted without consent from the copyright owner.
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