High-Precision Geochronology of LIP Intrusions: Records of Magma–Sediment Interaction

IF 2.2 2区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
S. Gaynor, Joshua Davies, U. Schaltegger
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引用次数: 0

Abstract

Reconstructing the tempo and emplacement mechanisms of large igneous provinces (LIPs) and establishing potential links to environmental change and biological crises requires detailed and targeted high-precision geochronology. Contact metamorphism during LIP intrusive magmatism can release large volumes of thermogenic gas, so determining the timing of these events relative to global climate change is crucial. The most reliable age information comes from U-Pb geochronology; however, LIP mafic igneous rocks do not commonly crystallize U-bearing minerals, such as zircon or baddeleyite. Recent work has shown that U-rich minerals can crystallize in fractionated melt pockets in intrusive components of LIPs after contamination of the melt by sedimentary rocks at emplacement level. Zircon and baddeleyite from these pockets make high-precision U-Pb geochronology of LIPs possible, but these unique mechanisms add other complexities.
LIP侵入体的高精度地质年代:岩浆-沉积相互作用的记录
要重建大型火成岩带(LIPs)的形成速度和成岩机制,并建立与环境变化和生物危机的潜在联系,需要详细而有针对性的高精度地质年代学。大火成岩带侵入岩浆作用期间的接触变质作用可释放出大量热成气体,因此确定这些事件与全球气候变化的时间关系至关重要。最可靠的年龄信息来自 U-Pb 地质年代学;然而,LIP 黑云母火成岩通常不会结晶出锆石或巴德磊石等含铀矿物。最近的研究表明,LIPs侵入成分中的熔体在成岩阶段受到沉积岩的污染后,可在分馏熔体袋中结晶出富铀矿物。这些熔块中的锆石和巴德磊石使得高精度的 LIPs U-Pb 地质年代成为可能,但这些独特的机制增加了其他复杂性。
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来源期刊
Elements
Elements 地学-地球化学与地球物理
CiteScore
7.20
自引率
0.00%
发文量
1
审稿时长
>12 weeks
期刊介绍: Elements is an international magazine of mineralogy, petrology, and geochemistry. Published bimonthly, every issue explores a theme of broad and current interest. Elements publishes invited peer-reviewed articles for each thematic collection of papers. Topics of interest can be proposed to the editors who will review every proposal submitted. Elements also presents regular features including a opinion articles, calendar of events, short course announcements, awards, conference reports, policy news, as well as news of the 18 participating societies.
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