DOI: 10.1038/s41561-021-00797-y
论文题名: Carbon concentration increases with depth of melting in Earth’s upper mantle
作者: Aiuppa A. ; Casetta F. ; Coltorti M. ; Stagno V. ; Tamburello G.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2021
语种: 英语
英文摘要: Carbon in the upper mantle controls incipient melting of carbonated peridotite and so acts as a critical driver of plate tectonics. The carbon-rich melts that form control the rate of volatile outflux from the Earth’s interior, contributing to climate evolution over geological times. However, attempts to constrain the carbon concentrations of the mantle source beneath oceanic islands and continental rifts is complicated by pre-eruptive volatile loss from magmas. Here, we compile literature data on magmatic gases, as a surface expression of the pre-eruptive volatile loss, from 12 oceanic island and continental rift volcanoes. We find that the levels of carbon enrichment in magmatic gases correlate with the trace element signatures of the corresponding volcanic rocks, implying a mantle source control. We use this global association to estimate that the mean carbon concentration in the upper mantle, down to 200 km depth, is approximately 350 ppm (range 117–669 ppm). We interpret carbon mantle heterogeneities to reflect variable extents of mantle metasomatism from carbonated silicate melts. Finally, we find that the extent of carbon enrichment in the upper mantle positively correlates with the depth at which melting starts. Our results imply a major role of carbon in driving melt formation in the upper mantle. © 2021, The Author(s), under exclusive licence to Springer Nature Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169709
Appears in Collections: 气候变化与战略
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作者单位: Dipartimento di Scienze della Terra e del Mare, Università di Palermo, Palermo, Italy; Dipartimento di Fisica e Scienze della Terra, Università di Ferrara, Ferrara, Italy; Dipartimento di Scienze della Terra, Università di Roma La Sapienza, Rome, Italy; Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Bologna, Bologna, Italy
Recommended Citation:
Aiuppa A.,Casetta F.,Coltorti M.,et al. Carbon concentration increases with depth of melting in Earth’s upper mantle[J]. Nature Geoscience,2021-01-01