Meteoritics & Planetary Science最新文献

{"title":"Correction to “Silicate–sulfide interaction within quenched melts of space weathered Ryugu grains”","authors":"","doi":"10.1111/maps.70113","DOIUrl":"https://doi.org/10.1111/maps.70113","url":null,"abstract":"<p>Laforet, S., Leroux, H., Le Guillou, C., Marinova, M., Néri, A., Teurtrie, A., et al. 2025. Silicate–Sulfide Interaction Within Quenched Melts of Space Weathered Ryugu Grains. <i>Meteoritics &amp; Planetary Science</i> 60: 1480–1501. https://doi.org/10.1111/maps.14366</p><p>Important information was missing from the originally published version of this article. This does not affect the scientific content of the publication.</p><p>In the section titled “Selected Grains and Their Handling,” we have added the following sentences: “A0159 was allocated to the Institut d'Astrophysique Spatiale (IAS, Orsay) through the first announcement of opportunity for Hayabusa2 samples. Small fragments detached from the surface of A0159 were prepared in Japan (JAXA) and transferred by IAS to University of Lille in the framework of the LARCAS French collaboration project”.</p><p>In the Acknowledgments, we have added the following: “We thank K. Hatakeda and the IAS team for preparing and transferring the fragments of A0159.” We have also added “LARCAS ANR (Reference No. SAN-22199)” should be “ANR project LARCAS under grant ANR-22-CE49-0009-01 of the French Agence Nationale de la Recherche.”</p><p>We apologize for these errors.</p>","PeriodicalId":18555,"journal":{"name":"Meteoritics & Planetary Science","volume":"61 3","pages":""},"PeriodicalIF":2.4,"publicationDate":"2026-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/maps.70113","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147564592","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Shock metamorphic effects in Itokawa phosphates: A comparison with megaregolith-derived meteorites","authors":"E. Dobrică,&nbsp;A. N. Krot,&nbsp;A. J. Brearley","doi":"10.1111/maps.70102","DOIUrl":"https://doi.org/10.1111/maps.70102","url":null,"abstract":"<p>Returned regolith samples from the asteroid Itokawa provide a unique opportunity to compare shock metamorphic effects in unconsolidated regolith materials with those preserved in lithified meteorites, that is, megaregolith. We analyzed four Itokawa particles (<i>Ueda</i>—RA-QD02-0519, <i>Narahara</i>—RA-QD02-0573, <i>Domon</i>—RA-QD02-0588, <i>Ishiuchi</i>—RX-MD03-0212) containing phosphates (merrillite and apatite) to assess their impact history. To place these observations in context, we also describe the associated mineral assemblages (silicates and chromite). While both space weathering effects, irradiation and impact, are present, the primary focus of this study is on impact-related modifications. We identified microcratering with a density comparable to that measured for Murchison, rare comminution effects in subsurface regolith materials, localized melting and vaporization, and partial decomposition of chromite into a high-pressure Fe₂Cr₂O₅ phase (modified ludwigite-type). The two apatite crystals analyzed lack any brittle deformation; however, one shows strong submicron-scale chlorine heterogeneity and porosity that are consistent with partial melting and volatile redistribution. In contrast, the two merrillite grains, identified in two different particles, contain dislocations. Their microstructures indicate distinct shock histories: one particle preserves only limited, localized deformation probably induced by micrometeoroid impacts, whereas the other shows extensive brittle deformation features consistent with a more pervasive shock event. The combination of ductile and brittle deformation, along with melting and comminution, reflects a more intense and spatially extensive shock metamorphic process. Dislocation densities are comparable to those observed in ordinary chondrites (OCs) of shock stage S2 (5–10 GPa). This study shows that phosphates in Itokawa regolith record highly localized and heterogeneous shock metamorphic overprints, in contrast to the more uniform relationship between shock metamorphic stage and phosphate deformation described in megaregolith OCs. Phosphates are sensitive shock metamorphic tracers in asteroidal regolith, but meteorite-based calibrations must be applied cautiously to unconsolidated materials.</p>","PeriodicalId":18555,"journal":{"name":"Meteoritics & Planetary Science","volume":"61 3","pages":"351-370"},"PeriodicalIF":2.4,"publicationDate":"2026-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/maps.70102","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147567776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cover","authors":"","doi":"10.1111/maps.70114","DOIUrl":"https://doi.org/10.1111/maps.70114","url":null,"abstract":"<p>\u0000 \u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure>\u0000 </p>","PeriodicalId":18555,"journal":{"name":"Meteoritics & Planetary Science","volume":"61 2","pages":""},"PeriodicalIF":2.4,"publicationDate":"2026-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/maps.70114","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146193346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A new approach for gravity modeling of complex impact structures on earth based on their strain distribution","authors":"Thushan Ekneligoda,&nbsp;Herbert Henkel","doi":"10.1111/maps.70091","DOIUrl":"https://doi.org/10.1111/maps.70091","url":null,"abstract":"<p>The processes of crater formation relevant to impact-induced fracturing of the target are illustrated and linked with the variation of bulk strain with depth, as extracted from numerical modeling. To this, the concept of <i>remaining impact induced porosity</i> was studied based on measured formation porosity data from deep drilling in two complex impact structures, Puchezh-Katunki and Ries, resulting in a common porosity depth relation. The analysis of the strain distribution revealed a pattern of systematic strain regimes associated with complex impact structures. The bulk strain distribution calculated across the whole width of the model crater allows data from the ring basin of the Ries structure to be combined with the central uplift data of the Puchezh-Katunki structure. The measured formation porosity includes the effects of lithostatic pressure and hydrothermal overprint and represents the porosity remaining after impact. The common porosity-depth relation is then correlated with the bulk strain distribution derived by the numerical modeling for a complex impact crater. The bulk strain distribution combined with the empiric porosity relation results indirectly in the density structure of complex impact craters. The obtained density distribution differs considerably from conventional thinking as it was found that an upper common density region is characteristic for the whole upper part of the collapsed crater interior, including both the mega breccia ring basin and the central uplift. Our approach provides an additional constraint improving the accuracy in gravity modeling of complex impact structures. The derived relation between bulk strain and porosity was applied to calculate the gravity effect of the model crater and compare it with the measured gravity anomaly of a similar sized impact structure.</p>","PeriodicalId":18555,"journal":{"name":"Meteoritics & Planetary Science","volume":"61 2","pages":"317-341"},"PeriodicalIF":2.4,"publicationDate":"2026-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146193618","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Graphite crystallinity and thermal record in Campo del Cielo IAB iron meteorite: A window into impact processing on a chondritic body","authors":"Xiao Tian Deng,&nbsp;Hong Yi Chen,&nbsp;Yang Li,&nbsp;Jin Yu Zhang,&nbsp;Lan Fang Xie,&nbsp;Si Zhe Zhao,&nbsp;Zhuang Guo,&nbsp;Chen Li,&nbsp;Kai Rui Tai","doi":"10.1111/maps.70085","DOIUrl":"https://doi.org/10.1111/maps.70085","url":null,"abstract":"<p>The Campo del Cielo iron meteorite (IAB-MG) provides a unique window into early solar system processes, particularly the formation and evolution of carbon phases in non-magmatic iron meteorites. In this study, we conducted a systematic nanostructural investigation of three distinct graphite occurrences—cliftonite (type I), interstitial graphite (type II), and silicate-associated graphite (type III)—within a single meteorite sample. Using a multi-technique approach, including scanning and transmission electron microscopy, Raman spectroscopy, X-ray diffraction, and electron probe microanalysis, we characterized their crystallographic properties, crystallinity, crystallite size, and crystallization temperatures. Our results reveal that type III graphite exhibits the highest crystallinity and largest crystallite size (average La = 287.4 nm), with a peak crystallization temperature of ~1112°C, while types I and II show comparable nanostructural features and lower crystallization temperatures (~991°C and ~1013°C, respectively). These differences reflect a crystallization sequence from silicate-associated with metal-encapsulated graphite, consistent with formation in impact-generated metallic melt pools. The absence of diamond or diaphite structures indicates peak shock pressures below ~100 GPa. Combined with mineral chemistry data indicating a reduced, magnesium-rich silicate assemblage akin to CR chondrites, our findings support an origin via impact melting on a partially differentiated, CR-like parent body. This work underscores the role of localized, shock-induced thermal processing in shaping the carbon inventory of primitive planetary bodies and provides a mineralogical framework for understanding the complex formation history of IAB iron meteorites.</p>","PeriodicalId":18555,"journal":{"name":"Meteoritics & Planetary Science","volume":"61 2","pages":"300-316"},"PeriodicalIF":2.4,"publicationDate":"2026-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/maps.70085","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146193557","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cover","authors":"","doi":"10.1111/maps.70096","DOIUrl":"10.1111/maps.70096","url":null,"abstract":"<p>\u0000 \u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure>\u0000 </p>","PeriodicalId":18555,"journal":{"name":"Meteoritics & Planetary Science","volume":"61 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2026-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/maps.70096","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146091346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Crater Ray Explorer (CRAYEX): Toolkit to evaluate the spallation expanse of rayed craters on lunar surface","authors":"Arya Nandakumar,&nbsp;Subhami Mohan,&nbsp;Sachana Sathyan,&nbsp;V. R. Rani,&nbsp;K. S. Sajinkumar,&nbsp;Megha Bhatt,&nbsp;Shyama Narendranath","doi":"10.1111/maps.70097","DOIUrl":"https://doi.org/10.1111/maps.70097","url":null,"abstract":"<p>Among the various impact features on the Moon, the ejecta—especially the distinct ray systems—are particularly noteworthy. Impact craters formed during the Eratosthenian (3.16–0.8 Ga) and Copernican (0.8 Ga to present) periods tend to preserve these ray systems, although later impacts can obscure rays from older craters. In this study, a faster approach for ejecta ray delineation is proposed through a toolkit named CRAYEX (Crater RAY EXplorer). An image-based methodology is applied to trace crater ejecta rays, taking advantage of albedo variations to discern both younger and older rayed ejecta material. The efficiency of this toolkit was demonstrated through a preliminary study of 10 representative craters distributed across both mare and highland terrains. To assess accuracy, the reliability of the thresholding method was tested by comparing Otsu, Multi-Otsu, Li, Yen, inverted Otsu, and F1-optimized thresholds. Among these, Otsu's method—based on the minimization of variance—proved to be the best approach for providing accurate segmentation results in remotely sensed images, yielding nearly optimal F1 measures. Using this approach, threshold values ranging from 0.4636 to 0.5118 were found to be effective for ejecta delineation from optical maturity (OMAT) images. Through iterative processes employing established methods (such as CraterPy for crater extraction and density slicing for intensity-based segmentation), CRAYEX successfully delineated rayed ejecta materials with observed F1 scores ranging from 0.4 to 0.6. Thus, CRAYEX paves the way for a more comprehensive exploration of lunar impact craters.</p>","PeriodicalId":18555,"journal":{"name":"Meteoritics & Planetary Science","volume":"61 2","pages":"285-299"},"PeriodicalIF":2.4,"publicationDate":"2026-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146176529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"New evidence on the formation conditions of the Libyan Desert Glass (Western Egypt): Clues from a dendritic zircon inclusion","authors":"Niccolò Magnani,&nbsp;Enrico Mugnaioli,&nbsp;Sofia Lorenzon,&nbsp;Lidia Pittarello,&nbsp;Tatiana E. Gorelik,&nbsp;Matteo Masotta,&nbsp;Luigi Folco","doi":"10.1111/maps.70094","DOIUrl":"https://doi.org/10.1111/maps.70094","url":null,"abstract":"<p>Libyan Desert Glass (LDG) is an ~29 million years old, silica-rich glass found in Western Egypt. Whether this glass formed in an impact cratering context associated with the hypervelocity collision of a cometary/asteroidal body or radiative heating during an airburst is debated. Determination of the formation temperatures and pressures of rare mineral components in LDG can provide key petrogenetic constraints on its origin. Here, we report the occurrence of a zircon inclusion, whose textural, chemical, and crystallographic features point to a rapid formation during solidification of the silica-rich LDG melt. The study was conducted combining dual beam microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, and three-dimensional electron diffraction. The inclusion is a few tens of micrometer in size and consists of dendritic branches of zircon arranged in a reticulate-cruciform texture. The high-silica glass filling interstices between dendrites have longer chemical bonds compared to matrix glass, as indicated by electron pair distribution function analysis, and is enriched in Al₂O₃. The lack of incongruent melt products (ZrO₂, SiO₂) suggests that the inclusion formed during cooling from supraliquidus conditions, by dynamic crystallization from an (immiscible) undercooled liquid droplet. Such droplet would derive from shock-induced melting of a precursor zircon grain, possibly mixed with the SiO₂-rich liquid formed by melting of the LDG precursor material. The formation model proposed for this inclusion does not allow us to discriminate between the two genetic processes proposed for LDG, but sets a new minimum to the liquidus temperature of the corresponding chemical system of ~2250°C.</p>","PeriodicalId":18555,"journal":{"name":"Meteoritics & Planetary Science","volume":"61 2","pages":"272-284"},"PeriodicalIF":2.4,"publicationDate":"2026-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/maps.70094","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146199402","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Correction to “Petrography and isotopic studies of refractory inclusions and Al-rich chondrules in Semarkona, ALHA81251, and Chainpur unequilibrated ordinary chondrites”","authors":"","doi":"10.1111/maps.70100","DOIUrl":"https://doi.org/10.1111/maps.70100","url":null,"abstract":"<p>Mishra, R.K., Marhas, K.K., Simon, J. I., Marrocchi, Y., and Villeneuve, J. (2025) Petrography and isotopic studies of refractory inclusions and Al-rich chondrules in Semarkona, ALHA81251, and Chainpur unequilibrated ordinary chondrites. <i>Meteoritics &amp; Planetary Science</i>, 60, 12, 2784–2810. https://doi.org/10.1111/maps.70062</p><p>In the legend for Figure 9b, Vigarano has been corrected to Chainpur. We apologize for this error.</p>","PeriodicalId":18555,"journal":{"name":"Meteoritics & Planetary Science","volume":"61 2","pages":""},"PeriodicalIF":2.4,"publicationDate":"2026-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/maps.70100","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146176459","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Fifth Arab and Africa Impact Cratering and Astrogeology Conference (AICAC V), November 9–15, 2025, Accra (Ghana)","authors":"M. S. Sapah,&nbsp;D. Baratoux,&nbsp;H. Chennaoui-Aoudjehane,&nbsp;C. Koeberl","doi":"10.1111/maps.70092","DOIUrl":"https://doi.org/10.1111/maps.70092","url":null,"abstract":"<p>We present a comprehensive report on the fifth edition of the Arab and Africa Impact Cratering and Astrogeology Conference (AICAC V), successfully held on November 9–15, 2025, in Ghana. This event was hosted by the Department of Earth Science at the University of Ghana in partnership with the African Initiative for Planetary and Space Science (AFIPS). It was the first time that a conference in this series was held in sub-Saharan Africa. It featured a pre-conference training workshop on the identification of impact craters, impactites, and meteorites; 2 days of scientific sessions with 27 presentations including special sessions and keynote talks (both held in Accra); and a 4-day field excursion to the IUGS Geological Heritage Site, the Bosumtwi impact crater. There were also hands-on exhibitions of CanSat and PocketQube satellites, telescopes, and space-themed artwork. With 62 conference participants from 15 (mostly African) countries, AICAC V helped to bring Africa's planetary science community together. Other key outcomes of the conference include its contribution to capacity building, particularly for local students. This event also highlighted the research, educational, and geotourism/ecotourism potentials of the Bosumtwi impact crater. The conference ended with a round table discussion, which resulted in a formal proposal for Egypt to host the next edition of the conference.</p>","PeriodicalId":18555,"journal":{"name":"Meteoritics & Planetary Science","volume":"61 2","pages":"342-347"},"PeriodicalIF":2.4,"publicationDate":"2026-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146176419","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}