Sub-arc mantle heterogeneity of the Northern Luzon Volcanic Arc: mineral and whole rock compositional variability in mantle xenoliths from Lutao Island

IF 3.5 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Journal of Petrology Pub Date : 2024-03-28 DOI:10.1093/petrology/egae037
J Gregory Shellnutt, Meng-Wan Yeh, Tung-Yi Lee, Yoshiyuki Iizuka, Wei-Yu Chen, M P Manu Prasanth
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Abstract

Mantle xenoliths hosted in volcanic rocks from the island of Lutao offer a glimpse into the nature of the mantle beneath the northern Luzon volcanic arc. The xenoliths are spinel-bearing and composed mostly of harzburgite with one lherzolite and one olivine orthopyroxenite. The olivine (Fo92.5-88.9), orthopyroxene (Mg# = 94.6-89.2), and clinopyroxene (Wo49.1-38.1En57.0-45.4Fs3.0-11.0) compositions are similar to those of abyssal peridotites. The spinel compositions are variable and can be principally divided into high-Al (Cr# < 45) and low-Al (Cr# > 45) groupings. The whole rock compositions are similar to abyssal peridotite (Al2O3 = 0.95-2.07 wt%; Mg# = 88.5-90.9) and have U-shaped chondrite normalized rare earth element patterns. The Sr-Nd isotopes of the xenoliths are broadly chondritic (87Sr/86Sri = 0.704400-0.707908; εNd(t) = 0.0-+1.5). The two-pyroxene equilibrium temperatures range from 900-1200°C with the majority of temperature estimates >1000°C. The olivine-orthopyroxene-spinel oxygen barometry estimates yielded ΔFMQ values from 0 to +2 and correspond to moderately oxidizing to oxidizing conditions. The xenoliths are likely derived from the Philippine Sea Plate lithospheric mantle that was modified by melt extraction and/or fluid enrichment processes. Trace element and isotopic mixing modeling indicate that 1% to 2% contamination by subducted South China Sea sediment can explain the Sr-Nd isotopic enrichment and Th and U elemental variability within the xenoliths assuming an initial composition similar to enriched depleted mid-ocean ridge mantle (E-DMM). The anomalously high two-pyroxene equilibrium temperatures of the Lutao xenoliths relative to other regions of the northern Luzon volcanic arc (Iraya < 1000°C) indicate that they were affected by a high temperature event that was likely a consequence of recent intra-arc rifting that occurred after collision (< 6 Ma) between the Luzon arc and the Eurasian margin.
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北吕宋火山弧的弧下地幔异质性:吕陶岛地幔异岩石中的矿物和全岩成分变异性
吕桃岛火山岩中的地幔异长岩让人们得以一窥吕宋岛北部火山弧下地幔的性质。这些奇石含有尖晶石,主要由哈兹堡垒岩组成,还有一块蛭石和一块橄榄石正长石。橄榄石(Fo92.5-88.9)、正辉石(Mg# = 94.6-89.2)和鳞辉石(Wo49.1-38.1En57.0-45.4Fs3.0-11.0)的成分与深海橄榄岩相似。尖晶石成分多变,主要可分为高铝(Cr# < 45)和低铝(Cr# > 45)两组。整个岩石成分与深海橄榄岩相似(Al2O3 = 0.95-2.07 wt%;Mg# = 88.5-90.9),并具有U形的软玉稀土元素归一化模式。这些辉石的 Sr-Nd 同位素大致为软玉性质(87Sr/86Sri = 0.704400-0.707908; εNd(t) = 0.0-+1.5)。双辉石平衡温度范围为 900-1200°C,大部分温度估计值为 >1000°C 。橄榄石-正辉石-尖晶石氧压估算得出的ΔFMQ值从0到+2不等,对应于中度氧化到氧化条件。这些岩石很可能来自菲律宾海板块岩石圈地幔,该地幔经过熔融萃取和/或流体富集过程而发生变化。痕量元素和同位素混合建模表明,1%-2%的南海俯冲沉积物污染可以解释硒钕同位素的富集,以及假设初始成分类似于富集贫化洋中脊地幔(E-DMM)的 Th 和 U 元素变异。相对于吕宋岛火山弧北部的其他地区(Iraya < 1000°C),吕桃岛奇石的双辉石平衡温度异常高,这表明它们受到了高温事件的影响,而高温事件很可能是吕宋岛火山弧与欧亚大陆边缘碰撞(< 6 Ma)后发生的近期弧内裂解的结果。
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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.
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