{"title":"Nd isotopic evolution of Archean tonalitic–granodioritic rocks of the Napier Complex, East Antarctica","authors":"Satoko SUZUKI, Tomokazu HOKADA, Masahiro ISHIKAWA, Takuji HAMAMOTO","doi":"10.2465/jmps.230330","DOIUrl":null,"url":null,"abstract":"We examined Sm–Nd isotopes of samples from the Archean tonalitic–granodioritic orthogneiss mass of Mt. Riiser-Larsen in the Napier Complex, East Antarctica. Analytical data show εNd ≈ 0 of ca. 3.27 and ca. 3.07 Ga at the time of protolith formation, as determined by SHRIMP zircon analyses. This differs from previously reported Sm–Nd whole-rock isotope data from the oldest tonalitic orthogneisses of Mt. Sones in the Napier Complex, which show εNd = 0 at 3.87 to 3.80 Ga (TCHUR), which is coincident with ca. 3.8 Ga from SHRIMP zircon analyses. These data suggest that the voluminous and homogeneous tonalitic–granodioritic rocks retained the εNd ≈ 0 signal throughout the protolith–metamorphic process and that the source materials of the rocks showed εNd ≈ 0 at ca. 3.80, 3.27 and 3.07 Ga. Tonalitic–granodioritic orthogneisses from the Napier Complex may contain genetic information regarding Nd isotopic evolution from the Paleoarchean to Mesoarchean.","PeriodicalId":51093,"journal":{"name":"Journal of Mineralogical and Petrological Sciences","volume":"85 1","pages":"0"},"PeriodicalIF":0.9000,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Mineralogical and Petrological Sciences","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.2465/jmps.230330","RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"MINERALOGY","Score":null,"Total":0}
引用次数: 0
Abstract
We examined Sm–Nd isotopes of samples from the Archean tonalitic–granodioritic orthogneiss mass of Mt. Riiser-Larsen in the Napier Complex, East Antarctica. Analytical data show εNd ≈ 0 of ca. 3.27 and ca. 3.07 Ga at the time of protolith formation, as determined by SHRIMP zircon analyses. This differs from previously reported Sm–Nd whole-rock isotope data from the oldest tonalitic orthogneisses of Mt. Sones in the Napier Complex, which show εNd = 0 at 3.87 to 3.80 Ga (TCHUR), which is coincident with ca. 3.8 Ga from SHRIMP zircon analyses. These data suggest that the voluminous and homogeneous tonalitic–granodioritic rocks retained the εNd ≈ 0 signal throughout the protolith–metamorphic process and that the source materials of the rocks showed εNd ≈ 0 at ca. 3.80, 3.27 and 3.07 Ga. Tonalitic–granodioritic orthogneisses from the Napier Complex may contain genetic information regarding Nd isotopic evolution from the Paleoarchean to Mesoarchean.
期刊介绍：
The Journal of Mineralogical and Petrological Sciences (JMPS) publishes original articles, reviews and letters in the fields of mineralogy, petrology, economic geology, geochemistry, planetary materials science, and related scientific fields. As an international journal, we aim to provide worldwide diffusion for the results of research in Japan, as well as to serve as a medium with high impact factor for the global scientific communication
Given the remarkable rate at which publications have been expanding to include several fields, including planetary and earth sciences, materials science, and instrumental analysis technology, the journal aims to encourage and develop a variety of such new interdisciplinary scientific fields, to encourage the wide scope of such new fields to bloom in the future, and to contribute to the rapidly growing international scientific community.
To cope with this emerging scientific environment, in April 2000 the journal''s two parent societies, MSJ* (The Mineralogical Society of Japan) and JAMPEG* (The Japanese Association of Mineralogists, Petrologists and Economic Geologists), combined their respective journals (the Mineralogical Journal and the Journal of Mineralogy, Petrology and Economic Geology). The result of this merger was the Journal of Mineralogical and Petrological Sciences, which has a greatly expanded and enriched scope compared to its predecessors.
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