DOI: 10.1016/j.epsl.2019.115889
论文题名: Magma ascent at floor-fractured craters diagnoses the lithospheric stress state on the Moon
作者: Michaut C. ; Pinel V. ; Maccaferri F.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 530 语种: 英语
中文关键词: crustal stress field
; floor-fractured crater
; lunar mare
; magma intrusion
; magma path
英文关键词: Floors
; Fracture
; Moon
; Unloading
; Crustal stress
; Elastic lithosphere
; Lithospheric structure
; lunar mare
; Magma intrusion
; magma path
; Magmatic intrusions
; Terrestrial planets
; Stress analysis
; crater
; lithosphere
; lunar mantle
; magma
; Moon
; sill
; stress field
; trajectory
; unloading
英文摘要: On the Moon, floor-fractured craters (FFCs) present evidence of horizontal crater-centred magmatic intrusions. Crater floor uplift and moat formation indicate that these sill intrusions occur at shallow depths (<10 km). While a recent study has demonstrated that magma ascent below FFCs and mare-filled craters was triggered by crater unloading, the mechanism leading to the emplacement of shallow sills is still poorly understood. Here we show that the local stress field due to crater unloading is also responsible for the horizontalisation of the magma flow leading to sill-like intrusions. On Earth, caldera formation has been shown to similarly affect magma trajectories, inducing the formation of a sill-shaped storage zone. Magma ascent to shallow depths below FFCs was however made possible because of a regional tensional stress caused by mare loading on the lunar lithosphere. We show that the tensional stress generated by elastic lithosphere deformation caused by mare loading combined to the local crater stress field can explain the distribution of FFCs on the Moon, with the smallest FFCs being located over a larger distance range from the mare. In particular, FFCs distribution around Oceanus Procellarum is consistent with an average load thickness of ∼1 km. This study suggests that magma trajectory in the crust of terrestrial planets can provide a diagnostic of the lithospheric structure and state of stress. © 2019 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165163
Appears in Collections: 气候变化与战略
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作者单位: Laboratoire de Géologie de Lyon, Université de Lyon, Ecole Normale Supérieure de Lyon, Université Lyon-1, CNRS, UMR 5276, 46 allée d'Italie, Lyon, F-69364, France; Université Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IRD, IFSTTAR, ISTerre, Grenoble, 38000, France; German Research Centre for Geoscience (GFZ), Telegrafenberg, Potsdam, 14473, Germany; Istituto Nazionale di Geofisica e Vulcanologia INGV, Osservatorio Vesuviano, Napoli, Italy
Recommended Citation:
Michaut C.,Pinel V.,Maccaferri F.. Magma ascent at floor-fractured craters diagnoses the lithospheric stress state on the Moon[J]. Earth and Planetary Science Letters,2020-01-01,530