气候变化领域集成服务门户(CCPortal): Space weathering by simulated micrometeorite bombardment on natural olivine and pyroxene: A coordinated IR and TEM study

CCPortal

DOI	10.1016/j.epsl.2019.115884
	Space weathering by simulated micrometeorite bombardment on natural olivine and pyroxene: A coordinated IR and TEM study
	Weber I.; Stojic A.N.; Morlok A.; Reitze M.P.; Markus K.; Hiesinger H.; Pavlov S.G.; Wirth R.; Schreiber A.; Sohn M.; Hübers H.-W.; Helbert J.
发表日期	2020
ISSN	0012821X
卷号	530
英文摘要	We studied space-weathering effects caused by micrometeorite bombardment simulated by pulsed intense infrared laser, generating ∼15 mJ per pulse in high vacuum. For our investigation, we selected a natural olivine (San Carlos olivine (Fo91)) and a natural pyroxene (Bamble orthopyroxene (En87)) as important rock forming minerals of the Earth upper mantle as well as key planetary minerals. Irradiated areas of powdered pressed samples were examined by optical reflection spectroscopy in a broad optical and infrared wavelength range (visible-, near-, and mid-infrared) and transmission electron microscopy to identify changes due to micrometeorite impacts. The present study aims to investigate especially the effects of micrometeorite bombardment on reflectance spectra in the mid-IR in preparation for future space missions, as well as for the MERTIS experiment onboard the BepiColombo mission. For both irradiated samples, we found a reduction in albedo and in the reflectance of characteristic Reststrahlen bands and an increase of the transparency feature. VIS and NIR spectra of both minerals show the typical darkening and reddening as described for other space-weathered samples. TEM studies revealed that space-weathered layers in olivine and pyroxene differ in their respective thickness, ∼450 nm in olivine, 100-250 nm in pyroxene, as well as in developed “nanostratigraphy” of laser-ablated material, like nanophase iron (npFe). In conclusion, our spectral and structural findings were compared to samples in which space weathering was caused by different processes. A comparison with these data demonstrates that there is no difference in optical reflectance spectroscopy, but a significant difference in the microstructure of minerals due to the weathering source in space, as there are solar wind and solar flares cause other structural and chemical changes as the bombardment with micrometeorites. © 2019 Elsevier B.V.
关键词	MERTIS micrometeorite bombardment natural silicates npFe space weathering
英文关键词	Experimental mineralogy; High resolution transmission electron microscopy; Infrared devices; Olivine; Pulsed lasers; Reflection; Silicates; Spacecraft instruments; Infrared wavelengths; MERTIS; micrometeorite bombardment; npFe; Optical reflection spectroscopies; Reflectance spectrum; Rock-forming minerals; Space weathering; Weathering; infrared spectroscopy; micrometeorite; olivine; pyroxene; silicate; transmission electron microscopy; upper mantle; weathering
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202963
作者单位	Westfälische Wilhelms Universität Münster, Institut für Planetologie, Wilhelm – Klemm Str. 10, Münster, 48149, Germany; German Aerospace Center (DLR), Institute of Optical Sensor Systems, Rutherfordstr. 2, Berlin, 12489, Germany; Helmholtz-Zentrum Potsdam, Deutsches Geoforschungszentrum (GFZ), Telegrafenberg, Potsdam, 14473, Germany; Hochschule Emden/Leer, Constantiaplatz 4, Emden, 26723, Germany; German Aerospace Center (DLR), Institute of Planetary Research, Rutherfordstr. 2, Berlin, 12489, Germany
推荐引用方式 GB/T 7714	Weber I.,Stojic A.N.,Morlok A.,et al. Space weathering by simulated micrometeorite bombardment on natural olivine and pyroxene: A coordinated IR and TEM study[J],2020,530.
APA	Weber I..,Stojic A.N..,Morlok A..,Reitze M.P..,Markus K..,...&Helbert J..(2020).Space weathering by simulated micrometeorite bombardment on natural olivine and pyroxene: A coordinated IR and TEM study.Earth and Planetary Science Letters,530.
MLA	Weber I.,et al."Space weathering by simulated micrometeorite bombardment on natural olivine and pyroxene: A coordinated IR and TEM study".Earth and Planetary Science Letters 530(2020).