| 太古宙富铁苦橄岩与太古宙早期深部地幔不均一性 |
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| 引用本文： | 王潮,宋述光.太古宙富铁苦橄岩与太古宙早期深部地幔不均一性[J].岩石学报,2021,37(1):65-73. |
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| 作者姓名： | 王潮 宋述光 |
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| 作者单位： | 中国地质大学(北京)地球科学与资源学院, 北京 100083;造山带与地壳演化教育部重点实验室, 北京大学地球与空间科学学院, 北京 100871 |
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| 基金项目： | 本文受国家自然科学基金项目（41903028、42030304、41890831）和中央高校基本科研业务费项目（2652018115）联合资助. |
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| 摘 要： | 富铁苦橄岩是一类特殊的高镁地幔来源岩浆岩,具有高的FeOT含量(>14%)和MgO含量(>12%),并富集不相容元素和具有轻重稀土强烈分异的稀土元素配分模式。富铁苦橄岩通常与科马提岩产出于绿岩带中,或产出于大火成岩省中,因此富铁苦橄岩的形成与地幔柱活动有着密切的联系,与其他高镁地幔来源岩浆岩(科马提岩、苦橄岩)一道成为了探究地球深部地幔的最佳材料。根据太古宙科马提岩成分随时间的演化,以往的研究认为地球深部地幔中出现富集组分的时间约为2.7Ga。而最近在华北克拉通冀东地区发现的古太古代(3.45Ga)富铁苦橄岩表明地球深部地幔中铁和不相容元素的局部富集可能在3.45Ga前后便已出现。对太古宙富铁苦橄岩的进一步研究有助于我们理解地球早期各圈层相互作用的模式。
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| 关 键 词： | 富铁苦橄岩 地幔不均一性 太古宙 |
| 收稿时间： | 2020/9/2 0:00:00 |
| 修稿时间： | 2020/11/18 0:00:00 |
Archean ferropicrites and Early Archean deep mantle heterogeneity |
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| WANG Chao,SONG ShuGuang.Archean ferropicrites and Early Archean deep mantle heterogeneity[J].Acta Petrologica Sinica,2021,37(1):65-73. |
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| Authors: | WANG Chao SONG ShuGuang |
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| Institution: | School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China; MOE Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, China |
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| Abstract: | Ferropicrites are a unique kind of magnesium-rich mantle-derived magmatic rocks, which are characterized by high contents of FeOT (>14%) and MgO (>12%), enrichment of incompatible elements and strongly fractionated rare earth element patterns. Ferropicrites commonly occur in greenstone belts together with komatiites, or in large igneous provinces, implying the close relationship between the generation of ferropicrites and mantle plume activities. Thus ferropicrites and other magnesium-rich mantle-derived magmatic rocks (komatiites and picrites) can probe the compositional features of their deep mantle source. Based on the compositional evolution of Archean komatiites through time, previous researches proposed that the emergence of enriched domains in Earth''s deep mantle took place at around 2.7Ga. However, the recent discovery of Paleoarchean (3.45Ga) ferropicrites in eastern Hebei, the North China Craton indicates that partial enrichment of iron and incompatible elements was present in Earth''s deep mantle as early as 3.45Ga. Further study of Archean ferropicrites can help us better understand the interaction between Earth''s different layers during its early history. |
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| Keywords: | Ferropicrites Mantle heterogeneity Archean |
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