DOI: 10.1002/2016GL070874
论文题名: Olivine settling in cosmic spherules during atmospheric deceleration: An indicator of the orbital eccentricity of interplanetary dust
作者: Genge M.J. ; Suttle M. ; Van Ginneken M.
刊名: Geophysical Research Letters
ISSN: 0094-8497
EISSN: 1944-8228
出版年: 2016
卷: 43, 期: 20 起始页码: 10646
结束页码: 10653
语种: 英语
英文关键词: cosmic spherules
Scopus关键词: Dust
; Flight simulators
; Nucleation
; Olivine
; Orbits
; Silicate minerals
; Spacecraft observatories
; Cosmic spherules
; Entry velocity
; Heterogeneous nucleation
; Interplanetary dust
; Orbital eccentricity
; Orbital variations
; Ordinary chondrites
; Relative abundance
; Cosmology
英文摘要: A new type of cosmic spherule is reported with textures suggesting settling of olivine during atmospheric deceleration. Numerical simulations of entry heating reveal that relict forsterite, which survives melting, can settle over the 1–2 s of flight at high entry angles and entry velocities up to 16 km s−1. Enhanced crystallization of phenocrysts by heterogeneous nucleation on accumulated relict forsterites is the most likely origin of the observed cumulate textures in cosmic spherules. Such textures in cosmic spherules reveal interplanetary dust with higher encounter velocity with the Earth that correspond to orbital eccentricities >0.3. The relative abundance of cumulate spherules suggests that 14% of ordinary chondrite-related, S(IV)-type asteroid dust over the last 800 kyr had relatively high orbital eccentricity owing to secular and planetary perturbations. The textures of cosmic spherules collected from sediments can therefore be used to trace dust orbital variations with time, which may influence terrestrial climate. ©2016. The Authors. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84991701982&doi=10.1002%2f2016GL070874&partnerID=40&md5=f37b3e024d0b5527872d7493cffed6d6
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9460
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Impact and Astromaterials Research Centre (IARC), Department of Earth Science and Engineering, Imperial College London, London, United Kingdom
Recommended Citation:
Genge M.J.,Suttle M.,Van Ginneken M.. Olivine settling in cosmic spherules during atmospheric deceleration: An indicator of the orbital eccentricity of interplanetary dust[J]. Geophysical Research Letters,2016-01-01,43(20).