干旱区生态环境知识资源中心(Arid): Blaubeuren, Cloppenburg, and Machtenstein-Three recently recognized H-group chondrite finds in Germany with distinct terrestrial ages and weathering effects

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DOI	10.1111/maps.13779
	Blaubeuren, Cloppenburg, and Machtenstein-Three recently recognized H-group chondrite finds in Germany with distinct terrestrial ages and weathering effects
	Bischoff, Addi; Storz, Jakob; Barrat, Jean-Alix; Heinlein, Dieter; Jull, A. J. Timothy; Merchel, Silke; Pack, Andreas; Rugel, Georg
通讯作者	Bischoff, A (corresponding author)，Westfalische Wilhelms Univ Munster, Inst Planetol, Wilhelm Klemm Str 10, D-48149 Munster, Germany.
来源期刊	METEORITICS & PLANETARY SCIENCE
ISSN	1086-9379
EISSN	1945-5100
出版年	2022
卷号	57 期号:1 页码:136-153
英文摘要	In the last 7 years, three meteorites (Blaubeuren, Cloppenburg, and Machtenstein) found in Germany were identified as chondrites. Two of these rocks had been recovered from the impact sites decades ago but not considered to be meteorites. The aim of this study is to fully characterize these three meteorites. Based on the compositional data on the silicates, namely olivine and low-Ca pyroxene, these meteorites fit nicely within the H-group ordinary chondrites. The brecciated texture of Blaubeuren and Cloppenburg (both H4-5) is perfectly visible, whereas that of Machtenstein, officially classified as an H5 chondrite, is less obvious but was detected and described in this study. Considering chondrites in general, brecciated rocks are very common rather than an exception. The bulk rock degree of shock is S2 for Blaubeuren and Machtenstein and S3 for Cloppenburg. All samples show significant features of weathering. They have lost their original fusion crust and more than half (W3) or about half (W2-3) of their original metal abundances. The oxygen isotope compositions of the three chondrites are consistent with those of other H chondrites; however, the Cloppenburg values are heavily disturbed and influenced by terrestrial weathering. This is supported by the occurrence of the very rare hydrated iron phosphate mineral vivianite (Fe2+ Fe-2(2+)[PO4](2)center dot 8H(2)O), which indicates that the chondrite was weathered in a very wet environment. The terrestrial ages of Blaubeuren (similar to 9.2 ka), Cloppenburg (similar to 5.4 ka), and Machtenstein (similar to 1.8 ka) show that these chondrites are very similar in their degree of alteration and terrestrial age compared to meteorite finds from relatively wet terrestrial environments. They still contain abundant metal, although, as noted, the oxygen isotope data indicate substantial weathering of Cloppenburg. The bulk compositions of the three meteorites are typical for H chondrites, although terrestrial alteration has slightly modified the concentrations, leading in general to a loss of Fe, Co, and Ni due to preferential alteration of metals and sulfides. As exceptions, Co and Ni concentrations in Machtenstein, which has the shortest terrestrial age, are typical for H chondrites. The chemical data show no enrichments in Ba and Sr, as is often observed in different meteorite groups of desert finds.
类型	Article
语种	英语
开放获取类型	hybrid, Green Published
收录类别	SCI-E
WOS记录号	WOS:000743075100001
WOS关键词	OXYGEN-ISOTOPE COMPOSITION ; AQUEOUS ALTERATION ; CARBONACEOUS CHONDRITE ; SHOCK METAMORPHISM ; REGOLITH BRECCIA ; ALMAHATA SITTA ; LATE ACCRETION ; PARENT BODIES ; METEORITE ; UNIQUE
WOS类目	Geochemistry & Geophysics
WOS研究方向	Geochemistry & Geophysics
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/376550
作者单位	[Bischoff, Addi; Storz, Jakob] Westfalische Wilhelms Univ Munster, Inst Planetol, Wilhelm Klemm Str 10, D-48149 Munster, Germany; [Barrat, Jean-Alix] Univ Brest, LEMAR, IFREMER, CNRS,IRD, F-29280 Plouzane, France; [Barrat, Jean-Alix] Inst Univ France, F-75005 Paris, France; [Heinlein, Dieter] German Fireball Network, Lilienstr 3, D-86156 Augsburg, Germany; [Jull, A. J. Timothy] Univ Arizona, AMS Lab, 1118 East Fourth St, Tucson, AZ 85721 USA; [Jull, A. J. Timothy] Hungarian Acad Sci, Inst Nucl Res, Isotope Climatol & Environm Res Ctr ICER, Bem Ter 18-C, H-4026 Debrecen, Hungary; [Merchel, Silke; Rugel, Georg] Helmholtz Zentrum Dresden Rossendorf, Bautzner Landstr 400, D-01328 Dresden, Germany; [Merchel, Silke] Univ Vienna, VERA Lab, Isotope Phys, Fac Phys, Wahringer Str 17, A-1090 Vienna, Austria; [Pack, Andreas] Univ Gottingen, Geowissensch Zentrum, Goldschmidtstr 1, D-37077 Gottingen, Germany
推荐引用方式 GB/T 7714	Bischoff, Addi,Storz, Jakob,Barrat, Jean-Alix,et al. Blaubeuren, Cloppenburg, and Machtenstein-Three recently recognized H-group chondrite finds in Germany with distinct terrestrial ages and weathering effects[J],2022,57(1):136-153.
APA	Bischoff, Addi.,Storz, Jakob.,Barrat, Jean-Alix.,Heinlein, Dieter.,Jull, A. J. Timothy.,...&Rugel, Georg.(2022).Blaubeuren, Cloppenburg, and Machtenstein-Three recently recognized H-group chondrite finds in Germany with distinct terrestrial ages and weathering effects.METEORITICS & PLANETARY SCIENCE,57(1),136-153.
MLA	Bischoff, Addi,et al."Blaubeuren, Cloppenburg, and Machtenstein-Three recently recognized H-group chondrite finds in Germany with distinct terrestrial ages and weathering effects".METEORITICS & PLANETARY SCIENCE 57.1(2022):136-153.