Nd isotopic evolution of Archean tonalitic–granodioritic rocks of the Napier Complex, East Antarctica

IF 0.9 4区地球科学 Q4 MINERALOGY

Journal of Mineralogical and Petrological Sciences Pub Date : 2023-01-01 DOI:10.2465/jmps.230330

Satoko SUZUKI, Tomokazu HOKADA, Masahiro ISHIKAWA, Takuji HAMAMOTO

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.

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东南极洲纳皮尔杂岩太古宙调性-花岗闪长岩的Nd同位素演化

研究了东南极洲Napier杂岩中Riiser-Larsen山太古宙调性-花岗闪长正长岩体样品的Sm-Nd同位素。经SHRIMP锆石分析，原岩形成时的εNd≈0约为3.27 ~ 3.07 Ga。这与之前报道的Napier杂岩最古老调性正剖面的Sm-Nd全岩同位素数据不同，在3.87 ~ 3.80 Ga (TCHUR)显示εNd = 0，与SHRIMP锆石分析的约3.8 Ga一致。这些数据表明，体积大且均匀的调性花岗闪长岩在整个原岩变质过程中保持了εNd≈0的信号，岩石的源物质在约3.80、3.27和3.07 Ga时表现出εNd≈0的特征。纳皮尔杂岩的调性-花岗闪长岩正长岩可能包含古太古代至中太古代Nd同位素演化的遗传信息。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Mineralogical and Petrological Sciences 地学-矿物学

CiteScore

1.80

自引率

14.30%

发文量

审稿时长

>12 weeks

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.