中亚新太古代基底、地幔富集与地壳萃取:中国东北2.5 Ga角闪岩和变质长岩的岩石成因

IF 1.9 3区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
Huichuan Liu, Jun Shao, G. Zhu, Yinglei Li
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引用次数: 2

摘要

中亚造山带(CAOB)的太古宙基底相对罕见,但它有可能为地球早期历史期间岩石圈地幔富集和地壳提取过程提供更多信息。我们在CAOB东南部Erguna Terrane的Bilya地区发现了新太古代角闪岩(2537−2565 Ma)和变闪长岩(2481−2539 Ma)。角闪岩的地球化学性质类似于MORB,具有弱左倾REE模式,锆石εHf(t)(−0.7−+6.2)值较低,全岩εNd(t)值(−1.7–+4.5)和εHf。我们的岩石成因建模表明,角闪岩来源于尖晶石稳定区(~65km深度)岩石圈地幔约20%的部分熔融。变闪长岩显示出接近零的εNd(t)(-0.5–+3.6)和εHf(t)值(+0.5–+1.4),可能源于镁铁质下地壳的部分熔融。变闪长岩和角闪岩可能形成于伸展大陆弧/弧后环境中,代表CAOB内微大陆的太古宙结晶基底。提出了三个阶段的地幔分离和地壳提取过程:(a)从原始地幔状岩石圈地幔中提取20%的熔体,留下贫化地幔;(b) 岩石圈地幔的俯冲相关流体/熔体交代作用及其部分熔融,形成弧型富集地幔和镁铁质下地壳;和(c)镁铁质下地壳的部分重熔产生了方钠石-方钠石花岗闪长岩(TTG)地壳。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Neoarchean basement, mantle enrichment and crustal extraction in central Asia: petrogenesis of 2.5 Ga amphibolite and metadiorite in NE China
Archean basement in the Central Asian Orogenic Belt (CAOB) is relatively rare, but it has the potential to provide additional information on the processes of lithospheric mantle enrichment and crust extraction processes during the early history of the Earth. We identified Neoarchean amphibolite (2537−2565 Ma) and metadiorite (2481−2539 Ma) in the Biliya area of the Erguna Terrane in the southeast CAOB. The amphibolite is geochemically MORB-like and has a weakly left-leaning REE pattern, and low zircon εHf(t) (−0.7−+6.2), and whole-rock εNd(t) (−1.7–+4.5) and εHf(t) (−1.9) values. Our petrogenetic modeling reveals that the amphibolite is derived from ∼20 % partial melting of the lithospheric mantle in the spinel stability field (∼65 km depth). The metadiorite shows near-zero εNd(t) (−0.5–+3.6) and εHf(t) (+0.5–+1.4) values and is likely derived from partial melting of mafic lower crust. The metadiorite and amphibolite likely formed in an extensional continental arc/back-arc setting and represent the Archean crystalline basement of the microcontinents within the CAOB. Three-staged mantle segregation and crust extraction processes have been proposed: (a) 20 % melt extraction from primitive mantle-like lithospheric mantle, leaving behind a depleted mantle; (b) subduction-related fluid/melt metasomatism of the lithospheric mantle and its partial melting, generating the arc-type enriched mantle and mafic lower crust; and (c) partial remelting of the mafic lower crust produced the Tonalite-trondhjemite-granodiorite (TTG) crust.
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来源期刊
American Journal of Science
American Journal of Science 地学-地球科学综合
CiteScore
5.80
自引率
3.40%
发文量
17
审稿时长
>12 weeks
期刊介绍: The American Journal of Science (AJS), founded in 1818 by Benjamin Silliman, is the oldest scientific journal in the United States that has been published continuously. The Journal is devoted to geology and related sciences and publishes articles from around the world presenting results of major research from all earth sciences. Readers are primarily earth scientists in academia and government institutions.
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