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			<titleStmt><title level='a'>Tracing primary signatures in Eo-Paleoarchean terranes: Mineral-scale constraints on disturbed bulk-rock isotope records</title></titleStmt>
			<publicationStmt>
				<publisher>Elsevier</publisher>
				<date>12/01/2025</date>
			</publicationStmt>
			<sourceDesc>
				<bibl> 
					<idno type="par_id">10688582</idno>
					<idno type="doi">10.1016/j.epsl.2025.119668</idno>
					<title level='j'>Earth and Planetary Science Letters</title>
<idno>0012-821X</idno>
<biblScope unit="volume">671</biblScope>
<biblScope unit="issue">C</biblScope>					

					<author>Manuela Botero</author><author>Jeffrey D Vervoort</author><author>Vinicius T Meira</author>
				</bibl>
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			<abstract><ab><![CDATA[The Hf and Nd isotope records from Earth’s earliest history are essential for understanding the processes of crustmantleevolution in the early Earth. These records, however, have been largely obtained from bulk-rock samplesthat have often been compromised by post-crystallization processes. Complexities resulting from open-systembehavior and mixing of different components are reflected in heterogeneous Eo-Paleoarchean bulk-rock Hfand Nd isotope records. In this study, we integrate in-situ Sm-Nd isotope analyses of REE-rich minerals with U-Pbtitanite geochronology to assess the reliability of the bulk-rock isotope record in ~3.6 Ga gneisses from thenorthern S˜ao Francisco Craton (NSFC). Our results demonstrate that Nd isotope compositions of minerals controllingthe elemental budget in rocks provide a more robust record of the early Earth. The NSFC mineral phasespreserving primary signatures have chondritic ƐNd(i) (0.0 to +0.3) at their crystallization ages (~3.6 Ga). Incontrast, bulk-rock Hf and Nd isotope compositions exhibit extreme heterogeneity (i.e. ƐNd(i) +4 to −12 ƐHf(i) +8to −14) reflecting post-crystallization disturbances at 2.5–2.0 Ga. When mineral phases in these rocks have Sm-Nd isochron ages that agree with their U-Pb crystallization ages, their initial Nd isotope compositions areconsistent with the zircon Hf isotope data. These findings align with global zircon Hf isotope data, which indicatea chondritic mantle reservoir until ~3.8 Ga, with evidence of significant mantle depletion and crustal differentiationemerging in the isotope record thereafter. This study underscores the importance of mineral-scaleisotope investigations in refining interpretations of early crust-mantle evolution and the mechanisms affectingbulk-rock isotope records in Precambrian terranes.]]></ab></abstract>
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