Plumbing System Architecture and Differentiation Processes of the Nyiragongo Volcano, DR Congo

地质学 岩浆房 地球化学 火山 熔岩 岩浆 黄铁矿 微量元素 岩性 橄榄石 不相容元素 分步结晶(地质学) 分馏 火成岩分异 矿物学 部分熔融 结壳 古生物学 化学 有机化学 尖晶石
作者
Sander M. Molendijk,Olivier Namur,Ephrem Kamate Kaleghetso,Paul R.D. Mason,Benoît Smets,Jacqueline Vander Auwera,David A. Neave
出处
期刊:Journal of Petrology [Oxford University Press]
卷期号:65 (1) 被引量:3
标识
DOI:10.1093/petrology/egad088
摘要

ABSTRACT The Nyiragongo volcano is one of the most alkali-rich volcanic centres on the planet (Na2O + K2O generally >10 wt.%, agpaitic index up to 1.34), characterized by a semi-permanently active lava lake which hosts silica-undersaturated (SiO2 < 40 wt.%), low viscosity lavas. To improve our understanding of this unique magmatic system, we present a set of 291 samples, acquired during new field excursions between 2017 and 2021. The major and trace element composition of all samples was measured, revealing a lithological range extending from primitive picrites (Mg# 82) erupted from parasitic cones to a variety of highly evolved nephelinites, leucitites, and melilitites erupted from the main edifice as recently as 2002, 2016, and 2021. We measured major and trace element compositions from the full spectrum of minerals present in all sampled lithologies. From these we calculated that the main magma reservoirs feeding Nyiragongo are at approximately 9–15 and 21–33 km depth, in agreement with recent seismic observations. Fractional crystallization modelling using observed mineral compositions and proportions was performed to quantitatively link the lithologies to specific residual liquid fractions assuming evolution from an olivine-melilite parental melt. Our modelling indicates that fractionation and cumulate formation in deep chambers reduces the remaining melt fraction to ~60%, after which melts are injected into upper, liquid dominated magma chambers where fractionation and accumulation of clinopyroxene, melilite, and feldspathoids dominates. Characterisation of mineral textures and geochemistry reveals high crystal mobility in a repeatedly recharging plumbing system split between liquid-dominated, evolved magma chambers and more solid-dominated, primitive mushes, decreasing in liquid fraction with depth.
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
lin发布了新的文献求助10
刚刚
1秒前
九湖夷上完成签到 ,获得积分10
1秒前
噼里啪啦完成签到 ,获得积分10
2秒前
大个应助hahaha123213123采纳,获得30
2秒前
2秒前
惊天大幂幂完成签到,获得积分10
2秒前
英姑应助Fang Xianxin采纳,获得10
3秒前
宋老师发布了新的文献求助30
3秒前
王洋完成签到,获得积分10
4秒前
lw777完成签到,获得积分20
4秒前
慢慢完成签到,获得积分10
4秒前
5秒前
靖123456发布了新的文献求助10
5秒前
拓跋箴完成签到,获得积分10
5秒前
彭于晏应助zy采纳,获得10
6秒前
精明玲完成签到 ,获得积分10
7秒前
7秒前
乐乐完成签到,获得积分10
8秒前
VirSnorlax完成签到,获得积分10
8秒前
SciGPT应助LL采纳,获得10
8秒前
妖孽宇发布了新的文献求助10
9秒前
aa完成签到,获得积分20
9秒前
aaaa完成签到,获得积分10
9秒前
马香芦完成签到,获得积分10
10秒前
西红柿完成签到,获得积分10
11秒前
12秒前
懵懂的冬灵完成签到,获得积分10
12秒前
碧蓝可仁完成签到 ,获得积分10
13秒前
王拉拉完成签到 ,获得积分10
13秒前
西西完成签到,获得积分10
13秒前
深情安青应助mkmimii采纳,获得10
14秒前
上官若男应助小王采纳,获得10
14秒前
bkagyin应助旦皋采纳,获得10
14秒前
Orange应助欣欣采纳,获得10
15秒前
玄学大哥完成签到,获得积分10
15秒前
15秒前
15秒前
kk完成签到,获得积分10
15秒前
ww007完成签到,获得积分10
17秒前
高分求助中
【提示信息,请勿应助】关于scihub 10000
Les Mantodea de Guyane: Insecta, Polyneoptera [The Mantids of French Guiana] 3000
徐淮辽南地区新元古代叠层石及生物地层 3000
The Mother of All Tableaux: Order, Equivalence, and Geometry in the Large-scale Structure of Optimality Theory 3000
Global Eyelash Assessment scale (GEA) 1000
Picture Books with Same-sex Parented Families: Unintentional Censorship 550
Research on Disturbance Rejection Control Algorithm for Aerial Operation Robots 500
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 4038388
求助须知:如何正确求助?哪些是违规求助? 3576106
关于积分的说明 11374447
捐赠科研通 3305798
什么是DOI,文献DOI怎么找? 1819322
邀请新用户注册赠送积分活动 892672
科研通“疑难数据库(出版商)”最低求助积分说明 815029