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Nanorocks, volatiles and plate tectonics
Geoscience Frontiers ( IF 8.9 ) Pub Date : 2021-04-03 , DOI: 10.1016/j.gsf.2021.101188
Gautier Nicoli , Silvio Ferrero

The global geological volatile cycle (H, C, N) plays an important role in the long term self-regulation of the Earth system. However, the complex interaction between its deep, solid Earth components (i.e. crust and mantle), Earth’s fluid envelopes (i.e. atmosphere and hydrosphere) and plate tectonic processes is a subject of ongoing debate. In this study we want to draw attention to how the presence of primary melt (MI) and fluid (FI) inclusions in high-grade metamorphic minerals could help constrain the crustal component of the volatile cycle. To that end, we review the distribution of MI and FI throughout Earth’s history, from ca. 3.0 Ga ago up to the present day. We argue that the lower crust might constitute an important, long-term, volatile storage unit, capable to influence the composition of the surface envelopes through the mean of weathering, crustal thickening, partial melting and crustal assimilation during volcanic activity. Combined with thermodynamic modelling, our compilation indicates that periods of well-established plate tectonic regimes at <0.85 Ga and 1.7–2.1 Ga, might be more prone to the reworking of supracrustal lithologies and the storage of volatiles in the lower crust. Such hypothesis has implication beyond the scope of metamorphic petrology as it potentially links geodynamic mechanisms to habitable surface conditions. MI and FI in metamorphic crustal rocks then represent an invaluable archive to assess and quantify the co-joint evolution of plate tectonics and Earth’s external processes.



中文翻译:

纳米岩石,挥发物和板块构造

全球地质挥发性循环(H,C,N)在地球系统的长期自我调节中起着重要作用。但是,其深层的固体地球成分(即地壳和地幔),地球的流体包裹体(即大气和水圈)以及板块构造过程之间的复杂相互作用一直是争论不休的话题。在这项研究中,我们希望引起人们注意,高级变质矿物中主要熔体(MI)和流体(FI)夹杂物的存在如何有助于限制挥发性循环的地壳成分。为此,我们回顾了大约从2000年开始,整个地球历史上MI和FI的分布情况。3.0 Ga前到今天。我们认为,下地壳可能构成了重要的,长期的,易挥发的存储单元,能够通过火山活动期间的风化,地壳增厚,部分融化和地壳同化作用来影响表层外壳的组成。结合热力学模型,我们的编译结果表明,在<0.85 Ga和1.7–2.1 Ga范围内建立良好的板块构造时期可能更倾向于重覆表层岩性和下地壳中的挥发物存储。这种假设的含义超出了变质岩石学的范围,因为它可能将地球动力学机制与宜居地表条件联系起来。变质地壳中的MI和FI代表了一个宝贵的档案,用于评估和量化板块构造与地球外部过程的共同联合演化。火山活动中的部分融化和地壳同化。结合热力学模型,我们的编译结果表明,在<0.85 Ga和1.7–2.1 Ga范围内建立良好的板块构造时期可能更倾向于重覆表层岩性和下地壳中的挥发物存储。这种假设的含义超出了变质岩石学的范围,因为它可能将地球动力学机制与宜居地表条件联系起来。变质地壳中的MI和FI代表了一个宝贵的档案,用于评估和量化板块构造与地球外部过程的共同联合演化。火山活动中的部分融化和地壳同化。结合热力学模型,我们的编译结果表明,在<0.85 Ga和1.7–2.1 Ga范围内建立良好的板块构造时期可能更倾向于重覆表层岩性和下地壳中的挥发物存储。这种假设的含义超出了变质岩石学的范围,因为它可能将地球动力学机制与宜居地表条件联系起来。变质地壳中的MI和FI代表了一个宝贵的档案,用于评估和量化板块构造与地球外部过程的共同联合演化。可能更倾向于返修表壳岩性,并在下地壳中储存挥发物。这种假设的含义超出了变质岩石学的范围,因为它可能将地球动力学机制与宜居地表条件联系起来。变质地壳中的MI和FI代表了一个宝贵的档案,用于评估和量化板块构造与地球外部过程的共同联合演化。可能更倾向于返修表壳岩性,并在下地壳中储存挥发物。这种假设的含义超出了变质岩石学的范围,因为它可能将地球动力学机制与宜居地表条件联系起来。变质地壳中的MI和FI代表了一个宝贵的档案,用于评估和量化板块构造与地球外部过程的共同联合演化。

更新日期:2021-04-16
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