Meteoritics & Planetary Science最新文献

{"title":"Cover","authors":"","doi":"10.1111/maps.14211","DOIUrl":"https://doi.org/10.1111/maps.14211","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":"60 9","pages":""},"PeriodicalIF":2.4,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/maps.14211","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145101500","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":"87th Annual Meeting of the Meteoritical Society 2025: Abstracts","authors":"","doi":"10.1111/maps.70033","DOIUrl":"https://doi.org/10.1111/maps.70033","url":null,"abstract":"","PeriodicalId":18555,"journal":{"name":"Meteoritics & Planetary Science","volume":"60 S1","pages":"30-350"},"PeriodicalIF":2.4,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/maps.70033","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145021795","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":"87th Annual Meeting of the Meteoritical Society 2025: Contents","authors":"","doi":"10.1111/maps.70032","DOIUrl":"https://doi.org/10.1111/maps.70032","url":null,"abstract":"","PeriodicalId":18555,"journal":{"name":"Meteoritics & Planetary Science","volume":"60 S1","pages":"2-29"},"PeriodicalIF":2.4,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/maps.70032","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145021802","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":"87th Annual Meeting of the Meteoritical Society 2025: Cover","authors":"","doi":"10.1111/maps.70034","DOIUrl":"https://doi.org/10.1111/maps.70034","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":"60 S1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/maps.70034","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145021801","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":"Geomorphological features in an unnamed impact crater in Xanthe Terra: Insights into the history of ice deposition in deep regions of low latitudes of Mars","authors":"Asif Iqbal Kakkassery,&nbsp;N. Najma,&nbsp;V. J. Rajesh,&nbsp;A. N. Manoharan,&nbsp;R. Jaumann","doi":"10.1111/maps.70012","DOIUrl":"https://doi.org/10.1111/maps.70012","url":null,"abstract":"<p>While polar regions on Mars have long been recognized as primary reservoirs of ice, recent studies suggest that ice-rich deposits may also exist at lower latitudes due to cyclic variations in Martian climate. This study presents findings from geomorphological research conducted in the deepest region of Xanthe Terra, an unnamed impact crater. The objectives were to investigate the morphology and topography of the area to assess the occurrence of glacial features and to establish their potential age and geological context. We identified compelling evidence for fluvial and glacial activities within the crater by carefully analyzing various landforms, including theater-head valleys, layered terrains, fans, sinuous ridges, and viscous flows. The findings suggest a dynamic environment shaped by water and ice processes, likely influenced by an impact event approximately 3.5 billion years ago. The presence of Amazonian fan deposits dating back to approximately 750 million years ago further highlights the continued activity of fluvial processes in the region. Our study contributes to a deeper understanding of Mars' geological evolution and underscores the importance of further research to unravel the complex history of the planet's low-latitudinal regions and its changing environmental conditions over time.</p>","PeriodicalId":18555,"journal":{"name":"Meteoritics & Planetary Science","volume":"60 9","pages":"1970-1994"},"PeriodicalIF":2.4,"publicationDate":"2025-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145102366","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":"Cover","authors":"","doi":"10.1111/maps.14209","DOIUrl":"https://doi.org/10.1111/maps.14209","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":"60 8","pages":""},"PeriodicalIF":2.4,"publicationDate":"2025-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/maps.14209","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144905570","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":"2025 Service Award for Rhiannon G. Mayne","authors":"Jemma Davidson,&nbsp;Catherine Corrigan","doi":"10.1111/maps.70009","DOIUrl":"https://doi.org/10.1111/maps.70009","url":null,"abstract":"&lt;p&gt;The Meteoritical Society Service Award selectee Dr. Rhiannon G. Mayne is recognized for over two decades of unrelenting dedication to the meteoritics and planetary science communities. Her widespread contributions have promoted research and education in meteoritics and planetary science through extensive education and public outreach activities, service to the broader scientific community, and the acquisition, classification, and curation of many new samples for research in the Monnig Collection.&lt;/p&gt;&lt;p&gt;Rhiannon earned her first degree in geology from Edinburgh University in 2002, followed by a Ph.D. from the University of Tennessee in 2008 under the tutelage of Hap McSween. Rhiannon then undertook a brief postdoctoral fellowship at the Smithsonian's National Museum of Natural History, where she worked with Tim McCoy and Cari Corrigan, before being appointed as the Oscar and Juanita Monnig Endowed Chair of Meteoritics and Planetary Science at Texas Christian University (TCU) in 2009. At the same time, Rhiannon was appointed the Curator of the Monnig Collection.&lt;/p&gt;&lt;p&gt;Rhiannon has, for her entire appointment at TCU, been the sole planetary scientist at her institution and the only employee who works with the Monnig Collection itself. In the last 16 years, Rhiannon has grown the Monnig Collection from less than 1500 classified meteorites to nearly 2500, and in 2014 completely recatalogued the Collection as many of the previous records were paper-based. These meteorites are available for scientific study, and the Monnig Collection, a once-hidden gem, has become increasingly visible under Rhiannon's stewardship.&lt;/p&gt;&lt;p&gt;Under Rhiannon's leadership, the Monnig Gallery has seen similar growth to the Monnig Collection. When Rhiannon joined TCU, the Gallery had a full-time Director who managed not only the budget and maintenance of the Gallery but also the public outreach. That position was eliminated in 2010, and Rhiannon assumed the role of Director in addition to her curatorial and professorial duties. In 2010, less than 4000 individuals came into contact with the Monnig Collection at public outreach events both off and on campus and during visits to the Gallery. Under Rhiannon's direction, and with the help of a part-time educator, that number rose to an astonishing 16,360 in 2018. The Gallery was closed during the early days of the COVID-19 pandemic and did not open again until June 2022. Since then, Rhiannon has seen thousands of individuals at public outreach events both on and off campus and welcomed many more to the Gallery as visitors during normal opening hours. All of this outreach is undertaken in addition to her work as Curator and an Associate Professor with a heavy teaching load.&lt;/p&gt;&lt;p&gt;As testament to her commitment to public engagement, Rhiannon undertook an Informal Learning in Museums Professional Certificate at Oregon State University to better understand how to maximize learning both for visitors to the Gallery and for those at outre","PeriodicalId":18555,"journal":{"name":"Meteoritics & Planetary Science","volume":"60 S1","pages":"359-361"},"PeriodicalIF":2.4,"publicationDate":"2025-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/maps.70009","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145022393","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":"Constraints on the fluid alteration of Nakhla meteorite inferred from Fe-rich phyllosilicate characterization","authors":"Isabella Pignatelli,&nbsp;Enrico Mugnaioli,&nbsp;Yves Marrocchi,&nbsp;Luigi Folco","doi":"10.1111/maps.70031","DOIUrl":"https://doi.org/10.1111/maps.70031","url":null,"abstract":"<p>The Nakhla Martian meteorite is known to contain secondary minerals, in particular phyllosilicates, that have recorded the conditions of aqueous alteration of the parent rock. A section of this meteorite was analyzed by transmission electron microscopy to characterize the phyllosilicates in veins and mesostasis. High resolution and electron diffraction, combined with chemical data, suggest the presence of veins in olivine filled by carbonates and hisingerite or hisingerite alone. In the mesostasis, phyllosilicates with composition close to that of ferripyrophyllite were observed in rounded pores within feldspars—these phyllosilicates are associated with areas rich in Si likely due to the presence of amorphous silica. Iron oxides/hydroxides were not found in this study. In addition, for the first time, wadsleyite was observed within the vein margins in olivine. Wadsleyite is evidence of shock metamorphism in Nakhla, whereas the veins result from the decompression after the shock wave passed through due to impact(s). The identification of these secondary minerals constrains the temperature, pH, and redox conditions during the aqueous alteration, underlying that these conditions changed over time. For example, hisingerite forms at <i>T</i> = 120–140°C and ferripyrophyllite at 55–65°C, confirming a progressive temperature decrease when the alteration went forward. The occurrence of these Fe-rich phyllosilicates has also implications on possible past life on Mars: H₂-fueled life cannot survive at <i>T</i> &gt; 122°C; thus, it is incompatible with the formation of hisingerite. Life could have been possible only during the last step of aqueous alteration, that is, when the temperature decreased and ferripyrophyllite formed.</p>","PeriodicalId":18555,"journal":{"name":"Meteoritics & Planetary Science","volume":"60 9","pages":"2197-2222"},"PeriodicalIF":2.4,"publicationDate":"2025-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145102250","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":"Citation for Dr. Conel M. O'D. Alexander, Leonard Medalist, 2025","authors":"Larry R. Nittler","doi":"10.1111/maps.70026","DOIUrl":"https://doi.org/10.1111/maps.70026","url":null,"abstract":"&lt;p&gt;President Consolmagno, friends and colleagues of the Meteoritical Society, it gives me great pleasure to present Dr. Conel Michael O'Donel Alexander (Figure 1) of the Carnegie Institution of Washington as the 2025 recipient of the &lt;i&gt;Leonard Medal&lt;/i&gt;. Conel is honored for the fundamental and important contributions he has made to many aspects of meteoritics and allied fields, including the nature and origin of chondrite matrix, the origin of presolar grains, the nature and origin of water and organic matter in the Solar System, the origin of chondrules, and the origin of major cosmochemical trends across the Solar System. He has made these contributions using a vast array of analytical and modeling tools. I first met Conel in July 1991, on my first day of graduate school at Washington University in St. Louis, where Conel was a postdoc. He became an important mentor and eventually my longest-running and closest scientific collaborator and a dear friend. I therefore feel very privileged to provide this citation.&lt;/p&gt;&lt;p&gt;Conel's grandfather Hugh Alexander was a famous cryptologist who helped crack the Enigma code in World War II and a famous chess grandmaster. His father Michael Alexander was an Olympic medalist in fencing and an important British diplomat, among other things serving as diplomatic personal secretary to Prime Minister Margaret Thatcher. Conel inherited the formidable intellect of his parents and grandparents and we are fortunate he chose to apply it to investigating meteorites and the mysteries they hold. He earned a bachelor's degree in Geology from Imperial College in 1983 and his PhD in Experimental Physics from the University of Essex in 1987. For his doctoral work, he worked with Professor David Barber and with Dr Robert Hutchison (Natural History Museum, London), applying transmission electron microscopy to the matrix of ordinary chondrites. Application of TEM to meteorites was still relatively rare, and Conel made the ground-breaking discovery that the least altered ordinary chondrites contained clay minerals in their matrix, belying the belief at the time that OCs were bone dry. As Prof. Monica Grady stated in her nominating letter, this “discovery was the starting point of a career that has embraced a range of disciplines and techniques applied to a range of objects (meteorites, micrometeorites, Earth, Moon, Mars, asteroids, comets) in order to understand the range of processes that ultimately resulted in the Solar System.”&lt;/p&gt;&lt;p&gt;Presolar grains were discovered in carbonaceous chondrites in 1987 and immediately piqued Conel's interest. Upon receiving his PhD, he joined Colin Pillinger's group at the Open University where he learned stable isotope mass spectrometry, made acid residues of several ordinary chondrites, and used stepped combustion to show that both presolar grains and isotopically anomalous organic matter were present in them, not just in carbonaceous meteorites. In 1989, he moved to Washington University to wo","PeriodicalId":18555,"journal":{"name":"Meteoritics & Planetary Science","volume":"60 S1","pages":"356-358"},"PeriodicalIF":2.4,"publicationDate":"2025-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/maps.70026","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145022392","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":"Olivine fabric and microstructure in Northwest Africa (NWA) 7059 and Nova 018: Insights into ureilite deformation","authors":"A. I. Sheen,&nbsp;C. K. F. Tirona,&nbsp;K. T. Tait,&nbsp;L. F. White,&nbsp;B. C. Hyde,&nbsp;S. Korchinos","doi":"10.1111/maps.70028","DOIUrl":"https://doi.org/10.1111/maps.70028","url":null,"abstract":"<p>Olivine is a major constituent in ureilites and commonly defines macroscopic fabric via shape-preferred orientation of elongate grains. In this study, we examined olivine fabric (crystallographic preferred orientation, or CPO) and microstructures in the unbrecciated olivine-pigeonite ureilites Northwest Africa (NWA) 7059 and Nova 018 using electron backscatter diffraction (EBSD) analysis. Point-per-grain orientation data of NWA 7059 indicate a &lt;010&gt; lineation subparallel to grain elongation. Misorientation data of two grains in NWA 7059 indicate dominant activity of (010) [100], (001) [100], (100) [001], and {<i>hk</i>0} [001] slip systems. Nova 018 displays an axial-[010] fabric, with misorientations indicating (010) [001], {<i>hk</i>0} [001] slips, and formation of (010) twist boundaries. Axial-[010] fabric in Nova 018 is consistent with compaction of residual olivine during melt extraction. The &lt;010&gt; lineation in NWA 7059 is unlike typical ureilite fabric and requires a [010] Burgers vector, uncommon in terrestrial samples. Rotational axis analysis of 2°–10° misorientations in olivine shows that the relative proportion of [001] slips and [100] slips in both ureilites are similar to warm-shocked ordinary chondrites, which were deformed at subsolidus temperatures. However, subsolidus deformation temperatures for both studied ureilites are inconsistent with a “hot disruption” model for the ureilite parent body (UPB). The further lack of correlation between 2°–10° misorientation metrics and olivine core Fo content argues against deformation temperature as the main control on olivine slip systems in ureilites. Our findings highlight the use of olivine petrofabric to gain insights into ureilite deformation, as well as complexities in interpreting olivine deformation data with respect to the history of the UPB.</p>","PeriodicalId":18555,"journal":{"name":"Meteoritics & Planetary Science","volume":"60 9","pages":"2166-2183"},"PeriodicalIF":2.4,"publicationDate":"2025-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/maps.70028","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145101960","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}