DOI: 10.1038/s41561-020-0595-0
论文题名: Evidence for a hot start and early ocean formation on Pluto
作者: Bierson C.J. ; Nimmo F. ; Stern S.A.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2020
卷: 13, 期: 7 起始页码: 468
结束页码: 472
语种: 英语
英文关键词: accretion
; ice ridge
; numerical model
; Pluto
; radioactive decay
; subsurface flow
; tectonics
; trough
; warming
英文摘要: Pluto is thought to possess a present-day ocean beneath a thick ice shell. It has generally been assumed that Pluto accreted from cold material and then later developed its ocean due to warming from radioactive decay; in this ‘cold start’ scenario, the ice shell would have experienced early compression and more recent extension. Here we compare thermal model simulations with geological observations from the New Horizons mission to suggest that Pluto was instead relatively hot when it formed, with an early subsurface ocean. Such a ‘hot start’ Pluto produces an early, rapid phase of extension, followed by a more prolonged extensional phase, which totals ~0.5% linear strain over the last 3.5 Gyr. The amount of second-phase extension is consistent with that inferred from extensional faults on Pluto; we suggest that an enigmatic ridge–trough system recently identified on Pluto is indicative of early extensional tectonics. A hot initial start can be achieved with the gravitational energy released during accretion if the final stage of Pluto’s accretion is rapid (<30 kyr). A fast final stage of growth is in agreement with models of the formation of Kuiper belt objects via gravitational collapse followed by pebble accretion, and implies that early oceans may have been common in the interiors of large Kuiper belt objects. © 2020, 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/169556
Appears in Collections: 气候变化与战略
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作者单位: Department of Earth and Planetary Sciences, University of California Santa Cruz, Santa Cruz, CA, United States; Southwest Research Institute, Boulder, CO, United States
Recommended Citation:
Bierson C.J.,Nimmo F.,Stern S.A.. Evidence for a hot start and early ocean formation on Pluto[J]. Nature Geoscience,2020-01-01,13(7)