The effects of partial melting and metasomatism on peridotite water contents: insights from Shuangliao Volcano Group, Northeast China

IF 3.5 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Chang-Yu Zhu, Huan Chen, Yan-Tao Hao
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Abstract

Many minerals within the subcontinental lithospheric mantle (SCLM) contain structurally bonded hydrogen (commonly referred to as “water”), which significantly impacts their physical properties and associated geodynamic processes. Observations from different localities worldwide make understanding the behavior of hydrogen during partial melting and mantle metasomatism a contentious issue, as different localities reveal either melting or metasomatism as the controlling factor. To provide new insights, major elements, trace elements and water contents of peridotite xenoliths from three volcanoes of the Shuangliao Volcano Group in Northeast China were analyzed. Minerals display variations in major and trace elements, particularly in clinopyroxene. Most olivine contain no observable water, while orthopyroxene and clinopyroxene retained 14-157 μg/g and 46-351 μg/g of water, respectively. Samples were divided into 3 types according to trace element patterns, namely, type 1: Light Rare Earth Elements (LREE)-depleted samples; type 2: “spoon-shaped” samples featuring slight enrichment of the most incompatible elements (La and Ce) and relative depletion of Mid-REE; and type 3: LREE-enriched samples. Combined with major element trends, the Shuangliao SCLM experienced varying degrees of partial melting and cryptic metasomatism. Different water contents in the Shuangliao SCLM are a combined result of melting and metasomatism: less metasomatized samples (LREE-depleted and “spoon-shaped”) preserved the control of water contents by partial melting, while strongly metasomatized samples (LREE-enriched), equilibrated at higher oxygen fugacity and temperature, display considerable post-melting modifications of water contents, possibly associated with Fe redox. These characteristics suggest that hydrous and oxidized melts/fluids likely released by the stagnant Pacific slab in the Big Mantle Wedge (BMW) have metasomatized the shallow SCLM beneath Shuangliao, which indicates the circulation of materials released by the stagnant slab throughout the upper mantle.
部分熔融和变质作用对橄榄岩含水率的影响:中国东北双辽火山群的启示
亚大陆岩石圈地幔(SCLM)中的许多矿物都含有结构键氢(通常称为 "水"),这对它们的物理性质和相关的地球动力学过程产生了重大影响。全球不同地区的观测结果表明,氢在部分熔化和地幔变质过程中的行为是一个有争议的问题,因为不同地区的观测结果表明,熔化或变质是控制氢的因素。为了提供新的见解,研究人员分析了中国东北双辽火山群三座火山的橄榄岩奇石中的主要元素、微量元素和水含量。矿物中的主要元素和微量元素都有变化,特别是在褐辉石中。大多数橄榄石不含有可观察到的水分,而正长石和霞石分别含有 14-157 μg/g 和 46-351 μg/g 的水分。根据微量元素的变化规律,将样品分为三类:第一类:轻稀土元素贫化样品;第二类:"勺形 "样品,其特征是最不相容元素(La 和 Ce)轻微富集,而中稀土元素相对贫化;第三类:轻稀土元素富集样品。结合主要元素的变化趋势,双辽SCLM经历了不同程度的部分熔融和隐伏变质作用。双辽SCLM中不同的含水率是熔融和变质作用的综合结果:变质作用较弱的样品(LREE贫化和 "勺状")通过部分熔融保留了对含水率的控制;而在较高的氧富集度和温度下平衡的强变质样品(LREE富集)则显示出熔融后含水率的显著变化,可能与铁氧化还原作用有关。这些特征表明,大地幔楔(BMW)中停滞的太平洋板块可能释放出的含水和氧化熔体/流体对双辽地下的浅层SCLM进行了元气化,这表明停滞板块释放的物质在整个上地幔中进行了循环。
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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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