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A multi-isotope approach towards constraining the origin of large-scale Paleoproterozoic B-(Fe) mineralization in NE China

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dc.contributor.authorDong, Aiguo
dc.contributor.authorZhu, Xiang-kun
dc.contributor.authorLi, Zhihong
dc.contributor.authorKendall, Brian
dc.contributor.authorLi, Shi-Zhen
dc.contributor.authorWang, Yue
dc.contributor.authorTang, Chao
dc.date.accessioned2018-09-10T18:44:28Z
dc.date.available2018-09-10T18:44:28Z
dc.date.issued2017-05-01
dc.descriptionThe final publication is available at Elsevier via https://doi.org/10.1016/j.precamres.2017.01.030 © 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.description.abstractBorate ore deposits occur predominantly in Phanerozoic evaporative sedimentary environments but are scarce in Precambrian strata. However, massive B- and Mg-rich borate deposits are abundant in the Paleoproterozoic strata of Northeast (NE) China. In addition, several of these borate deposits are dominated by Fe (e.g., >60% Fe2O3 content in the Wengquangou deposit). To constrain the origin of these unusual deposits, we obtained B, Fe, and Mg isotope data on the wall rocks and ores of the Mg-rich Houxianyu borate deposit and the Fe-rich Wengquangou borate deposit in NE China. The d11B values of the borate deposits (10.7 ± 4.4‰, n = 15) are higher than most types of igneous and non-evaporative sedimentary rocks, suggesting that B is of evaporative sedimentary origin. However, the borate deposits have a limited range of d56Fe values near 0‰ (0.05 ± 0.18‰, n = 24), which is similar to igneous rocks and thus points to a magmatic origin for the Fe. The d26Mg values of the ores and associated rocks ( 0.52 ± 0.34‰, n = 24) are intermediate between Mg-rich carbonate rocks and igneous rocks, suggesting a mixed sedimentary and magmatic origin for the Mg. Regional metamorphism and intense deformation modified the deposits significantly by promoting metasomatic alteration of the igneous rocks and evaporite minerals, thus resulting in mixing of magmatic and sedimentary-evaporative sources as well as recrystallization of the sedimentary borate precursors to metamorphic borate minerals. Hence, the B, Fe, and Mg isotope data together with geological and mineralogical observations indicate that formation of the Paleoproterozoic B-(Fe) deposits in NE China involved a three-stage process: enrichment of B and Mg by evaporative sedimentation, introduction of Fe and additional Mg by volcanism, and modification by regional metamorphism/metasomatism.en
dc.description.sponsorshipNSFC || (No. 41203004) NSFC || (No. 4127306 CAGS Research Fund || (YYWF201603) NSERC Discovery Grant || (RGPIN-435930)en
dc.identifier.urihttps://doi.org/10.1016/j.precamres.2017.01.030
dc.identifier.urihttp://hdl.handle.net/10012/13776
dc.language.isoenen
dc.publisherElsevieren
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectB isotopesen
dc.subjectFe isotopesen
dc.subjectMg isotopesen
dc.subjectBorate depositen
dc.subjectIron depositen
dc.subjectPaleoproterozoicen
dc.titleA multi-isotope approach towards constraining the origin of large-scale Paleoproterozoic B-(Fe) mineralization in NE Chinaen
dc.typeArticleen
dcterms.bibliographicCitationDong A., Zhu X., Li Z., Kendall B., Li S., Wang Y., Tang C., 2017. A multi-isotope approach towards constraining the origin of large-scale Paleoproterozoic B-(Fe) mineralization in NE China. Precambrian Research, v. 292, p. 115-129.en
uws.contributor.affiliation1Faculty of Scienceen
uws.contributor.affiliation2Earth and Environmental Sciencesen
uws.peerReviewStatusRevieweden
uws.scholarLevelFacultyen
uws.typeOfResourceTexten

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