Reexamining the Honolulu Volcanics: Hawai‘i's classic case of rejuvenation volcanism

IF 3.5 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Journal of Petrology Pub Date : 2024-09-05 DOI:10.1093/petrology/egae093
Michael O Garcia, Marc D Norman, Brian R Jicha, Kendra J Lynn, Peng Jiang
{"title":"Reexamining the Honolulu Volcanics: Hawai‘i's classic case of rejuvenation volcanism","authors":"Michael O Garcia, Marc D Norman, Brian R Jicha, Kendra J Lynn, Peng Jiang","doi":"10.1093/petrology/egae093","DOIUrl":null,"url":null,"abstract":"Rejuvenated volcanism is a worldwide phenomenon occurring on many oceanic islands in all of the major ocean basins. This plume-related volcanism follows the main edifice-building stage after a hiatus of variable duration (e.g., 0.6–2 Myrs in Hawai‘i). The Honolulu Volcanics (HV), the classic case of rejuvenated volcanism, involved monogenetic eruptions from at least 48 vent areas. Previous studies inferred these vents were aligned along 3–11 rifts oriented orthogonal to the propagation direction of the Hawaiian plume. HV basalts are known for having high MgO contents (>10 wt.%) and upper mantle xenoliths. Thus, HV magmas are assumed to be relatively primitive and to have ascended rapidly (<1 day) through the crust. However, new analyses of olivine cores in basalts from 24 HV vents are mostly too low in forsterite content (74–86 mol.%) to be in equilibrium with mantle melts. Olivine and clinopyroxene in HV basalts commonly show reverse zoning indicating magma mixing prior to eruption. These results are inconsistent with the rapid ascent of HV magmas directly from their mantle source. Many of the HV magmas underwent storage (probably in the lower crust or uppermost mantle), crystal fractionation and magma mixing prior to eruption. New 40Ar/39Ar dates were determined for 11 HV lavas to evaluate their eruptive history. These ages, 80 to 685 ka, combined with our previous and other 40Ar/39Ar ages for HV lavas reveal long gaps (>50 kyr) between some eruptions. Our comprehensive, whole-rock major and trace element database (63 XRF analyses, 57 ICPMS analyses) of basalts from 37 vents show remarkable compositional diversity with no obvious spatial pattern or temporal trends. The two most recent eruptive sequences have the greatest diversity (basanite and melilitite compositions). HV basanites show systematic trace element trends that may reflect mixing of multiple source components. The nephelinites and melilitites require a complex source history that may have involved residual accessory minerals during mantle melting and a metasomatic component that was not carbonatitic. The new ages and geochemical data show eruptions along most of the previously proposed rift systems were unrelated (except for the Koko Rift). Therefore, geodynamic models that relate HV volcanism to these rift systems are invalid. Lava volumes for two HV eruptions were estimated at 0.11 and 0.23 km3 using surface mapping and water well data. Similar size, recent monogenetic eruptions in Auckland, New Zealand, were inferred to have lasted several months. Thus, if another HV eruption were to occur, which is possible given the long hiatus between eruptions, it would be extremely disruptive for the nearly 1 million residents of Honolulu. None of the existing geodynamic models fully explain the age duration, volumes and the locations of Hawai‘i's rejuvenated volcanism. Thus, the cause of this secondary volcanism remains enigmatic.","PeriodicalId":16751,"journal":{"name":"Journal of Petrology","volume":null,"pages":null},"PeriodicalIF":3.5000,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Petrology","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.1093/petrology/egae093","RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"GEOCHEMISTRY & GEOPHYSICS","Score":null,"Total":0}
引用次数: 0

Abstract

Rejuvenated volcanism is a worldwide phenomenon occurring on many oceanic islands in all of the major ocean basins. This plume-related volcanism follows the main edifice-building stage after a hiatus of variable duration (e.g., 0.6–2 Myrs in Hawai‘i). The Honolulu Volcanics (HV), the classic case of rejuvenated volcanism, involved monogenetic eruptions from at least 48 vent areas. Previous studies inferred these vents were aligned along 3–11 rifts oriented orthogonal to the propagation direction of the Hawaiian plume. HV basalts are known for having high MgO contents (>10 wt.%) and upper mantle xenoliths. Thus, HV magmas are assumed to be relatively primitive and to have ascended rapidly (<1 day) through the crust. However, new analyses of olivine cores in basalts from 24 HV vents are mostly too low in forsterite content (74–86 mol.%) to be in equilibrium with mantle melts. Olivine and clinopyroxene in HV basalts commonly show reverse zoning indicating magma mixing prior to eruption. These results are inconsistent with the rapid ascent of HV magmas directly from their mantle source. Many of the HV magmas underwent storage (probably in the lower crust or uppermost mantle), crystal fractionation and magma mixing prior to eruption. New 40Ar/39Ar dates were determined for 11 HV lavas to evaluate their eruptive history. These ages, 80 to 685 ka, combined with our previous and other 40Ar/39Ar ages for HV lavas reveal long gaps (>50 kyr) between some eruptions. Our comprehensive, whole-rock major and trace element database (63 XRF analyses, 57 ICPMS analyses) of basalts from 37 vents show remarkable compositional diversity with no obvious spatial pattern or temporal trends. The two most recent eruptive sequences have the greatest diversity (basanite and melilitite compositions). HV basanites show systematic trace element trends that may reflect mixing of multiple source components. The nephelinites and melilitites require a complex source history that may have involved residual accessory minerals during mantle melting and a metasomatic component that was not carbonatitic. The new ages and geochemical data show eruptions along most of the previously proposed rift systems were unrelated (except for the Koko Rift). Therefore, geodynamic models that relate HV volcanism to these rift systems are invalid. Lava volumes for two HV eruptions were estimated at 0.11 and 0.23 km3 using surface mapping and water well data. Similar size, recent monogenetic eruptions in Auckland, New Zealand, were inferred to have lasted several months. Thus, if another HV eruption were to occur, which is possible given the long hiatus between eruptions, it would be extremely disruptive for the nearly 1 million residents of Honolulu. None of the existing geodynamic models fully explain the age duration, volumes and the locations of Hawai‘i's rejuvenated volcanism. Thus, the cause of this secondary volcanism remains enigmatic.
查看原文
分享 分享
微信好友 朋友圈 QQ好友 复制链接
本刊更多论文
重新审视檀香山火山岩:夏威夷火山再生的经典案例
活火山活动是一种世界性现象,发生在所有主要大洋盆地的许多海洋岛屿上。这种与羽状火山活动有关的火山活动是在主要火山建造阶段之后出现的,持续时间长短不一(如夏威夷的 0.6-2 Myrs)。檀香山火山群(HV)是典型的年轻化火山活动,至少有 48 个喷口区进行了单源喷发。之前的研究推断,这些喷口沿着与夏威夷羽流传播方向正交的 3-11 条裂谷排列。众所周知,HV玄武岩具有较高的氧化镁含量(>10 wt.%)和上地幔碎屑。因此,HV 岩浆被认为是相对原始的,并在地壳中快速上升(1 天)。然而,对来自 24 个 HV 喷口的玄武岩中的橄榄石核心进行的新分析表明,大部分橄榄石的辉石含量太低(74-86 mol.%),无法与地幔熔体达到平衡。HV玄武岩中的橄榄石和褐辉石通常呈现反向分带,表明岩浆在喷发前已经混合。这些结果与 HV 岩浆直接从地幔源快速上升的情况不符。许多HV岩浆在喷发前经历了储存(可能在下地壳或最上地幔)、晶体分馏和岩浆混合。对 11 个 HV 岩浆测定了新的 40Ar/39Ar 时间,以评估其喷发历史。这些年龄(80 至 685 ka)与我们以前和其他高纯度火山熔岩的 40Ar/39Ar 年龄相结合,揭示了一些火山喷发之间的长间隔(>50 kyr)。我们对来自 37 个喷口的玄武岩进行了全面的全岩主要元素和痕量元素数据库(63 项 XRF 分析、57 项 ICPMS 分析),结果表明玄武岩的成分具有显著的多样性,没有明显的空间模式或时间趋势。最近的两个喷发序列具有最大的多样性(玄武岩和熔岩成分)。高压玄武岩显示出系统的微量元素趋势,这可能反映了多种来源成分的混合。霞石和麦饭石需要一个复杂的来源历史,可能涉及地幔熔融过程中的残余附属矿物和非碳酸盐化的偏硅酸盐成分。新的年龄和地球化学数据显示,之前提出的大多数裂谷系统沿线的喷发都是不相关的(科科裂谷除外)。因此,将 HV 火山活动与这些裂谷系统联系起来的地球动力学模型是无效的。根据地表测绘和水井数据,两次 HV 火山喷发的熔岩体积估计分别为 0.11 和 0.23 立方公里。据推断,新西兰奥克兰最近发生的类似规模的单源喷发持续了几个月。因此,如果再发生一次 HV 火山喷发(鉴于喷发间隔时间较长,这是有可能发生的),将对檀香山近 100 万居民造成极大的破坏。现有的地球动力学模型都无法完全解释夏威夷年轻火山活动的持续时间、数量和位置。因此,这种二次火山活动的原因仍然是个谜。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 去求助
来源期刊
Journal of Petrology
Journal of Petrology 地学-地球化学与地球物理
CiteScore
6.90
自引率
12.80%
发文量
117
审稿时长
12 months
期刊介绍: The Journal of Petrology provides an international forum for the publication of high quality research in the broad field of igneous and metamorphic petrology and petrogenesis. Papers published cover a vast range of topics in areas such as major element, trace element and isotope geochemistry and geochronology applied to petrogenesis; experimental petrology; processes of magma generation, differentiation and emplacement; quantitative studies of rock-forming minerals and their paragenesis; regional studies of igneous and meta morphic rocks which contribute to the solution of fundamental petrological problems; theoretical modelling of petrogenetic processes.
期刊最新文献
Unraveling the Magmatic-to-Carbothermal Processes in the Ba-Sr-REE Mineralization of the Sevattur Carbonatites, India Geodynamic Evolution of the Proto-Tethys Ocean in the West Kunlun Orogenic Belt, NW Tibet: Implications from the Sub-Arc Crust and Lithospheric Mantle Modification Crystals and melt inclusions record deep storage of superhydrous magma prior to the largest known eruption of Cerro Machín volcano, Colombia Composite melt-rock interactions in the lowermost continental crust: insights from a dunite-pyroxenite-gabbronorite association of the Mafic Complex from the Ivrea-Verbano Zone (Italian Alps) Reexamining the Honolulu Volcanics: Hawai‘i's classic case of rejuvenation volcanism
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
已复制链接
已复制链接
快去分享给好友吧!
我知道了
×
扫码分享
扫码分享
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1