U-Pb Geochronology and Lu-Hf Isotopic Characterization of the Canadian High Arctic Large Igneous Province (HALIP): Comparison to Oceanic Plateau Magmatism

IF 3 2区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Geochemistry Geophysics Geosystems Pub Date : 2025-02-10 DOI:10.1029/2024GC011762

D. M. Dockman, T. Hadlari, D. G. Pearson, L. M. Heaman, C. Sarkar, K. Dewing

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Abstract

Recent high-precision geochronological studies have delineated three main pulses of basaltic magmatism between ca. 130-80 Ma in the Cretaceous High Arctic Large Igneous Province (HALIP) in northern Canada. Here we report new U-Pb TIMS baddeleyite and zircon dates for samples from Axel Heiberg and Ellesmere Islands, which further support the duration and pulsed nature of the magmatism previously documented. We add new LA-ICPMS U-Pb zircon dates on samples analyzed in a previous study to help resolve age heterogeneity observed in some samples. We also report the first LA-ICPMS zircon Lu-Hf results from HALIP intrusives to better constrain the HALIP mantle source composition. Initial εHf zircon results for five HALIP basalts with minimal evidence for continental crustal contamination from the Canadian Arctic Islands range from +9.0 to +14.7, and indicate extraction from a depleted mantle source similar to plume-derived oceanic plateaux such as Kerguelen.

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加拿大高北极大火成岩省（HALIP） U-Pb年代学和Lu-Hf同位素特征：与海洋高原岩浆活动的比较

最近的高精度地质年代学研究描绘了加拿大北部白垩纪高北极大火成岩省（HALIP）约130-80 Ma之间的三个主要玄武岩岩浆活动脉冲。本文报道了来自阿克塞尔海伯格岛和埃尔斯米尔岛样品的新的U-Pb TIMS bad - yite和锆石日期，进一步支持了之前记录的岩浆活动的持续时间和脉冲性质。我们在之前的研究中分析的样品中添加了新的LA-ICPMS U-Pb锆石日期，以帮助解决一些样品中观察到的年龄异质性。我们还报道了来自HALIP侵入体的首次LA-ICPMS锆石Lu-Hf结果，以更好地约束HALIP地幔源组成。来自加拿大北极群岛的5块HALIP玄武岩的初始εHf锆石结果在+9.0 ~ +14.7之间，表明其来自一个类似于Kerguelen等羽状海洋高原的枯竭地幔源。

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来源期刊

Geochemistry Geophysics Geosystems 地学-地球化学与地球物理

CiteScore

5.90

自引率

11.40%

发文量

252

审稿时长

1 months

期刊介绍： Geochemistry, Geophysics, Geosystems (G3) publishes research papers on Earth and planetary processes with a focus on understanding the Earth as a system. Observational, experimental, and theoretical investigations of the solid Earth, hydrosphere, atmosphere, biosphere, and solar system at all spatial and temporal scales are welcome. Articles should be of broad interest, and interdisciplinary approaches are encouraged. Areas of interest for this peer-reviewed journal include, but are not limited to: The physics and chemistry of the Earth, including its structure, composition, physical properties, dynamics, and evolution Principles and applications of geochemical proxies to studies of Earth history The physical properties, composition, and temporal evolution of the Earth''s major reservoirs and the coupling between them The dynamics of geochemical and biogeochemical cycles at all spatial and temporal scales Physical and cosmochemical constraints on the composition, origin, and evolution of the Earth and other terrestrial planets The chemistry and physics of solar system materials that are relevant to the formation, evolution, and current state of the Earth and the planets Advances in modeling, observation, and experimentation that are of widespread interest in the geosciences.