气候变化领域集成服务门户(CCPortal): Earth-like lithospheric thickness and heat flow on Venus consistent with active rifting

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DOI	10.1038/s41561-022-01068-0
	Earth-like lithospheric thickness and heat flow on Venus consistent with active rifting
	Smrekar, Suzanne E.; Ostberg, Colby; O'Rourke, Joseph G.
发表日期	2023
ISSN	1752-0894
EISSN	1752-0908
起始页码	13
结束页码	+
卷号	16 期号:1 页码:12
英文摘要	Venus is Earth's twin in size and radiogenic heat budget, yet it remains unclear how Venus loses its heat absent plate tectonics. Most Venusian stagnant-lid models predict a thick lithosphere with heat flow about half that of Earth's mobile-lid regime. Here we estimate elastic lithospheric thickness at 75 locations on Venus using topographic flexure at 65 coronae-quasi-circular volcano-tectonic features-determined from Magellan altimetry data. We find an average thickness at coronae of 11 +/- 7 km. This implies an average heat flow of 101 +/- 88 mW m(-2), higher than Earth' s average but similar to terrestrial values in actively extending areas. For some locations, such as the Parga Chasma rift zone, we estimate heat flow exceeding 75 mW m(-2). Combined with a low-resolution map of global elastic thickness, this suggests that coronae typically form on thin lithosphere, instead of locally thinning the lithosphere via plume heating, and that most regions of low elastic thickness are best explained by high heat flow rather than crustal compensation. Our analysis identifies likely areas of active extension and suggests that Venus has Earth-like lithospheric thickness and global heat flow ranges. Together with the planet's geologic history, our findings support a squishy-lid convective regime that relies on plumes, intrusive magmatism and delamination to increase heat flow. An analysis of elastic lithospheric thickness suggests most coronae on Venus form on thin lithosphere with heat flow similar to that of rift zones on Earth, supporting a planet with active rifting and a squishy-lid convective regime.
学科领域	Geosciences, Multidisciplinary
语种	英语
WOS研究方向	Geology
WOS记录号	WOS:000883294100005
来源期刊	NATURE GEOSCIENCE
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/272625
作者单位	California Institute of Technology; National Aeronautics & Space Administration (NASA); NASA Jet Propulsion Laboratory (JPL); University of California System; University of California Riverside; Arizona State University; Arizona State University-Tempe
推荐引用方式 GB/T 7714	Smrekar, Suzanne E.,Ostberg, Colby,O'Rourke, Joseph G.. Earth-like lithospheric thickness and heat flow on Venus consistent with active rifting[J],2023,16(1):12.
APA	Smrekar, Suzanne E.,Ostberg, Colby,&O'Rourke, Joseph G..(2023).Earth-like lithospheric thickness and heat flow on Venus consistent with active rifting.NATURE GEOSCIENCE,16(1),12.
MLA	Smrekar, Suzanne E.,et al."Earth-like lithospheric thickness and heat flow on Venus consistent with active rifting".NATURE GEOSCIENCE 16.1(2023):12.