NWA 12522分带辉石的显微矿物学:对辉石晶化史的启示

IF 2.2 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Meteoritics & Planetary Science Pub Date : 2024-11-08 DOI:10.1111/maps.14283
Zhuang Guo, Yu Zhu, Yang Li, Ian M. Coulson, Xiongyao Li, Jianzhong Liu
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引用次数: 0

摘要

玄武质闪长岩是火星陨石中最丰富的岩石类型,闪长岩中的辉石颗粒通常呈带状结构。本文结合扫描电子显微镜、电子微探针、拉曼光谱和透射电子显微镜,研究了玄武质舍尔格特岩 NWA 12522 中成片带状辉石的详细微观矿物学特征。结果表明,NWA 12522 中的带状辉石核心具有均匀的 Mg# 值,主要由奥氏体和鸽铁矿组成。相比之下,带状辉石的边缘极具铁性,并可根据截然不同的矿物学和纹理进一步划分为两个区域(即远核和近核辉石边缘)。近核边缘显示出狭窄的外溶解薄片(约 35 nm),这些薄片被细长的鸽血石细脉交叉切割,并含有大量纳米级的可变质辉石和鸽血石颗粒。在远核辉石边缘区域只观察到相对较粗的外溶蚀层(约 80 nm)。NWA 12522 中辉石边缘和核心的不同矿物学特征意味着不同的结晶条件,均质的富镁辉石核心应该是由深埋腔内的岩浆缓慢结晶而成的,随后在这些辉石核心上升到火星表面的过程中,这些辉石核心上出现了过度生长的演化熔体,在近核区域出现了纳米级的可转移相(辉石)的非平衡结晶。NWA 12522中辉石边缘异常低的ΣREE含量和陡峭的REE模式(高Yb/La比值)意味着莫来石应在辉石边缘之前结晶,使残余熔体变得REE贫化而HREE富集。
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Microscopic mineralogy of zoned pyroxene in NWA 12522: Implications for the crystallization histories of the shergottites

Basaltic shergottites are the most abundant rock type of Martian meteorites, and pyroxene grains within shergottites commonly show a zoned structure. Here, the detailed microscopic mineralogical characteristics of patchy zoned pyroxene in basaltic shergottite NWA 12522 were investigated by a combination of scanning electron microscopy, electron microprobe, Raman spectroscopy, and transmission electron microscopy. The results show that the cores of zoned pyroxene in NWA 12522 have a homogeneous Mg# value and consist mainly of augite and pigeonite. By contrast, the rim of zoned pyroxene is extremely ferroan and can be further divided into two regions based on quite distinct mineralogy and textures (i.e., far-core and near-core pyroxene rims). The near-core rim shows narrow exsolution lamellae (~35 nm) that were cross-cut by thin pigeonite veinlets and contain abundant nano-sized particles of metastable pyroxferroite and pigeonite. Only relatively coarse exsolution lamellae (~80 nm) were observed in the far-core pyroxene rim regions. The distinct mineralogical characteristics of the pyroxene rims and cores in NWA 12522 imply different crystallization conditions, and the homogeneous Mg-rich pyroxene cores should have slowly crystallized from magma within a deep-seated chamber, followed by an overgrown evolved melt on these pyroxene cores during their ascent to the Martian surface, and disequilibrium crystallization of nano-sized metastable phase (pyroxferroite) occurred in the near-core region. The abnormally low ΣREE contents and steep REE pattern (high Yb/La ratio) of the pyroxene rims in NWA 12522 imply that merrillite should have crystallized prior to the pyroxene rims, making the residual melt become REE-depleted and HREE-enriched.

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来源期刊
Meteoritics & Planetary Science
Meteoritics & Planetary Science 地学天文-地球化学与地球物理
CiteScore
3.90
自引率
31.80%
发文量
121
审稿时长
3 months
期刊介绍: First issued in 1953, the journal publishes research articles describing the latest results of new studies, invited reviews of major topics in planetary science, editorials on issues of current interest in the field, and book reviews. The publications are original, not considered for publication elsewhere, and undergo peer-review. The topics include the origin and history of the solar system, planets and natural satellites, interplanetary dust and interstellar medium, lunar samples, meteors, and meteorites, asteroids, comets, craters, and tektites. Our authors and editors are professional scientists representing numerous disciplines, including astronomy, astrophysics, physics, geophysics, chemistry, isotope geochemistry, mineralogy, earth science, geology, and biology. MAPS has subscribers in over 40 countries. Fifty percent of MAPS'' readers are based outside the USA. The journal is available in hard copy and online.
期刊最新文献
Issue Information Cover 2004 Barringer Medal for Peter Schultz A reappraisal of the petrogenesis of Apollo 17 lunar dunites 72415-72417: Relics of the deep lunar mantle? 2007 Service Award for John Schutt
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