High-precision geochronology of the Equatorial Atlantic Magmatic Province (EQUAMP): Temporal correlations with the Paraná-Etendeka Magmatic Province and the Weissert Event

IF 4.8 1区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Earth and Planetary Science Letters Pub Date : 2025-03-27 DOI:10.1016/j.epsl.2025.119330

Alisson L. Oliveira , Maria Helena B.M. Hollanda , Mark D. Schmitz , Antomat A. Macêdo Filho , Elisabetta Erba , James L. Crowley

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Abstract

The Equatorial Atlantic Magmatic Province (EQUAMP) is an intrusive large igneous province (LIP) related to the dismembering of the West Gondwana supercontinent and early opening stage of the South Atlantic Ocean. Here, we present the first set of high-precision (at the 100 ka-level) U-Pb zircon geochronology for the EQUAMP by the chemical abrasion isotope dilution thermal ionization mass spectrometry method. Based on our results, the EQUAMP was emplaced in a short time interval, between 133.805 ± 0.021 Ma and 133.071 ± 0.031 Ma and appears to be coeval with the Paraná Etendeka Magmatic Province (∼134.5–132.0 Ma). Both LIPs are currently exposed at the margins of the South Atlantic Ocean and could have jointly contributed greenhouse gasses and fresh mafic exposures susceptible to chemical weathering that ultimately fertilized the oceans, cooled the Earth, affected calcareous nannoplankton and produced a paleoclimate disturbance — the Valanginian Weissert Event.

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赤道大西洋岩浆省（EQUAMP）高精度年代学：与Paraná-Etendeka岩浆省和Weissert事件的时间相关性

赤道大西洋岩浆省（EQUAMP）是一个侵入性大型火成岩省（LIP），与西冈瓦纳超大陆的解体和南大西洋的早期开辟阶段有关。在此，我们采用化学磨蚀同位素稀释热电离质谱法，首次对EQUAMP进行了高精度（100ka级）U-Pb锆石地质年代的研究。根据我们的研究结果，EQUAMP是在133.805 ± 0.021 Ma和133.071 ± 0.031 Ma之间的短时间内形成的，似乎与Paraná Etendeka岩浆省（∼134.5-132.0 Ma）同时期。这两个LIPs目前都暴露在南大西洋的边缘，可能共同贡献了温室气体和易受化学风化影响的新鲜岩浆岩，最终使海洋肥沃、地球冷却、影响钙质楠木浮游生物并产生了古气候扰动--瓦朗基年魏塞特事件（Valanginian Weissert Event）。

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来源期刊

Earth and Planetary Science Letters 地学-地球化学与地球物理

CiteScore

10.30

自引率

5.70%

发文量

475

审稿时长

2.8 months

期刊介绍： Earth and Planetary Science Letters (EPSL) is a leading journal for researchers across the entire Earth and planetary sciences community. It publishes concise, exciting, high-impact articles ("Letters") of broad interest. Its focus is on physical and chemical processes, the evolution and general properties of the Earth and planets - from their deep interiors to their atmospheres. EPSL also includes a Frontiers section, featuring invited high-profile synthesis articles by leading experts on timely topics to bring cutting-edge research to the wider community.