Pub Date : 2026-02-09DOI: 10.1016/j.chemgeo.2026.123292
David A. Wood
Substantial uncertainty remains regarding the petrogenetic and tectono-magmatic processes that influence IPB compositional heterogeneity. This study distinguishes young (<10 Ma) IPB compositions of continental regions (CIB), ocean islands underlain by or closely associated with continental crust (OIBc) and ocean islands underlain by oceanic crust (OIBo). These distinctions provide insights into the interactions of processes involved in their genesis. A recently compiled global IPB dataset (5911 samples) and the average intraplate basalt composition (WLD) is employed to categorize and interpret these three IPB groups. It does so with major- and trace-element, and Nd-, Sr- and Pb-isotope data distributions. The average regional IPB compositions are analysed using WLD-normalized profiles and two-dimensional representations of ternary compositional relationships. Average CIB and OIBo, and OIBo and OIBc groups can be distinguished with statistical significance but the OIBc and CIB groups cannot be so distinguished. A wider separation can be achieved between these three groups using elemental ternary relationships than with radiogenic isotopes. A ternary relationship incorporating average major-element, trace-element and Pb-isotope ratios (K2O/TiO2-Hf/Th-208Pb/206Pb) normalized to the WLD composition provides a useful integrated discriminator between the groups. The locations of overlapping regions between the CIB and OIBo groups suggest that the dynamics between continental crust and underlying mantle processes is complex and variable. A speculative petrogenetic model is proposed to distinguish CIB, OIBc, and OIBo compositions. It involves distinctive contributions from variably metasomatized lithospheric mantle, moderated by contributions from asthenosphere outflow, and ancient subducted crustal materials residing in the large low shear velocity provinces of deep mantle and the mantle transition zone. Bulk crustal contamination also variably impacts CIB and OIBc regions.
{"title":"Average benchmark compositions of intraplate basalts with continental and ocean island provenance","authors":"David A. Wood","doi":"10.1016/j.chemgeo.2026.123292","DOIUrl":"https://doi.org/10.1016/j.chemgeo.2026.123292","url":null,"abstract":"Substantial uncertainty remains regarding the petrogenetic and tectono-magmatic processes that influence IPB compositional heterogeneity. This study distinguishes young (<10 Ma) IPB compositions of continental regions (CIB), ocean islands underlain by or closely associated with continental crust (OIBc) and ocean islands underlain by oceanic crust (OIBo). These distinctions provide insights into the interactions of processes involved in their genesis. A recently compiled global IPB dataset (5911 samples) and the average intraplate basalt composition (WLD) is employed to categorize and interpret these three IPB groups. It does so with major- and trace-element, and Nd-, Sr- and Pb-isotope data distributions. The average regional IPB compositions are analysed using WLD-normalized profiles and two-dimensional representations of ternary compositional relationships. Average CIB and OIBo, and OIBo and OIBc groups can be distinguished with statistical significance but the OIBc and CIB groups cannot be so distinguished. A wider separation can be achieved between these three groups using elemental ternary relationships than with radiogenic isotopes. A ternary relationship incorporating average major-element, trace-element and Pb-isotope ratios (K<ce:inf loc=\"post\">2</ce:inf>O/TiO<ce:inf loc=\"post\">2</ce:inf>-Hf/Th-<ce:sup loc=\"post\">208</ce:sup>Pb/<ce:sup loc=\"post\">206</ce:sup>Pb) normalized to the WLD composition provides a useful integrated discriminator between the groups. The locations of overlapping regions between the CIB and OIBo groups suggest that the dynamics between continental crust and underlying mantle processes is complex and variable. A speculative petrogenetic model is proposed to distinguish CIB, OIBc, and OIBo compositions. It involves distinctive contributions from variably metasomatized lithospheric mantle, moderated by contributions from asthenosphere outflow, and ancient subducted crustal materials residing in the large low shear velocity provinces of deep mantle and the mantle transition zone. Bulk crustal contamination also variably impacts CIB and OIBc regions.","PeriodicalId":9847,"journal":{"name":"Chemical Geology","volume":"315 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2026-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146146727","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-02-08DOI: 10.1016/j.chemgeo.2026.123290
Emily J. Archibald, James W. Marschalek, Adrian R. Muxworthy, Teal Riley, Claus-Dieter Hillenbrand, Tom Jordan, Pieter Vermeesch, Michael J. Flowerdew, Martin Siegert, Dominic A. Hodgson, Tina van de Flierdt
{"title":"Geochemical characterisation of the Ellsworth-Whitmore Mountains crustal block: a critical piece in the puzzle to unravel ice retreat in West Antarctica","authors":"Emily J. Archibald, James W. Marschalek, Adrian R. Muxworthy, Teal Riley, Claus-Dieter Hillenbrand, Tom Jordan, Pieter Vermeesch, Michael J. Flowerdew, Martin Siegert, Dominic A. Hodgson, Tina van de Flierdt","doi":"10.1016/j.chemgeo.2026.123290","DOIUrl":"https://doi.org/10.1016/j.chemgeo.2026.123290","url":null,"abstract":"","PeriodicalId":9847,"journal":{"name":"Chemical Geology","volume":"5 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2026-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146138458","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-02-08DOI: 10.1016/j.chemgeo.2026.123289
Ni Su, Junjie Guo, Xiaolei Xie, Zhouyang Wu, Yalong Li, Shouye Yang
{"title":"Strontium isotopes tracing of weathering processes and tidal mixing in a mountainous river system","authors":"Ni Su, Junjie Guo, Xiaolei Xie, Zhouyang Wu, Yalong Li, Shouye Yang","doi":"10.1016/j.chemgeo.2026.123289","DOIUrl":"https://doi.org/10.1016/j.chemgeo.2026.123289","url":null,"abstract":"","PeriodicalId":9847,"journal":{"name":"Chemical Geology","volume":"1 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2026-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146138459","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Multiple-stage evolution of the Cenozoic ductile deformation in the Tethyan orogenic belt constrained via single-grain mica Rb Sr isochron ages","authors":"Weiyong Li, Dongyang Huo, Shuhao Tang, Chengzhang Dou, Jun He, Fukun Chen","doi":"10.1016/j.chemgeo.2026.123287","DOIUrl":"https://doi.org/10.1016/j.chemgeo.2026.123287","url":null,"abstract":"","PeriodicalId":9847,"journal":{"name":"Chemical Geology","volume":"91 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2026-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146135027","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-02-04DOI: 10.1016/j.chemgeo.2026.123286
Fay M. Amstutz, Michael J. Stock, Victoria C. Smith, Roberto Isaia, David van Acken, Stefano Vitale, Jacopo Natale, J. Stephen Daly, Adrian Boyce
{"title":"Isotopic constraints on volcano-tectonically controlled assimilation at Campi Flegrei, Italy","authors":"Fay M. Amstutz, Michael J. Stock, Victoria C. Smith, Roberto Isaia, David van Acken, Stefano Vitale, Jacopo Natale, J. Stephen Daly, Adrian Boyce","doi":"10.1016/j.chemgeo.2026.123286","DOIUrl":"https://doi.org/10.1016/j.chemgeo.2026.123286","url":null,"abstract":"","PeriodicalId":9847,"journal":{"name":"Chemical Geology","volume":"295 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2026-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146110941","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-02-02DOI: 10.1016/j.chemgeo.2026.123284
Shuaiqi Liu, Guibin Zhang, Qi Jin, Lu Xiong, Shuzhen Wang
{"title":"Boron isotopes of tourmaline and muscovite record melt formation and fluid-magma interactions in high-silica granitic rocks","authors":"Shuaiqi Liu, Guibin Zhang, Qi Jin, Lu Xiong, Shuzhen Wang","doi":"10.1016/j.chemgeo.2026.123284","DOIUrl":"https://doi.org/10.1016/j.chemgeo.2026.123284","url":null,"abstract":"","PeriodicalId":9847,"journal":{"name":"Chemical Geology","volume":"289 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2026-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146110623","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-31DOI: 10.1016/j.chemgeo.2026.123281
Kwangchul Jang, Youngsook Huh, Yeongcheol Han
{"title":"Glacially enhanced incongruent weathering in the Bering Sea recorded by hafnium‑neodymium isotopes","authors":"Kwangchul Jang, Youngsook Huh, Yeongcheol Han","doi":"10.1016/j.chemgeo.2026.123281","DOIUrl":"https://doi.org/10.1016/j.chemgeo.2026.123281","url":null,"abstract":"","PeriodicalId":9847,"journal":{"name":"Chemical Geology","volume":"32 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2026-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146095920","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-31DOI: 10.1016/j.chemgeo.2026.123280
Maddison L. Lauer, Ashlea N. Wainwright, Roland Maas, Amy Roberts, Rachel S. Popelka-Filcoff
{"title":"Strontium, neodymium and lead isotope systems for tracing cultural ochre provenance","authors":"Maddison L. Lauer, Ashlea N. Wainwright, Roland Maas, Amy Roberts, Rachel S. Popelka-Filcoff","doi":"10.1016/j.chemgeo.2026.123280","DOIUrl":"https://doi.org/10.1016/j.chemgeo.2026.123280","url":null,"abstract":"","PeriodicalId":9847,"journal":{"name":"Chemical Geology","volume":"17 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2026-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146095921","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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