Meteoritics & Planetary Science最新文献

{"title":"Incompatible trace element geochemistry of the anorthositic achondrite Northwest Africa (NWA) 15118: Relation to diogenites and the Vestan magma ocean","authors":"A. I. Sheen,&nbsp;K. T. Tait,&nbsp;V. E. Di Cecco,&nbsp;B. R. Joy,&nbsp;C. J. Bray","doi":"10.1111/maps.14292","DOIUrl":"https://doi.org/10.1111/maps.14292","url":null,"abstract":"<p>Petrogenetic models for the howardite–eucrite–diogenite (HED) clan of achondrites have been challenged by the lack of substantial plagioclase in the HED record, which is at odds with the chemical composition of diogenites. Northwest Africa (NWA) 15118, an anorthositic achondrite, displays strong isotopic affinities with HEDs and has been proposed as a lunar-style primary flotation crust of the Vestan magma ocean. Nevertheless, a geochemical link with known HEDs, particularly diogenites, remains to be demonstrated. We present major, minor, and trace element data for plagioclase and orthopyroxene in NWA 15118. Despite textural evidence for post-crystallization shock and thermal metamorphism, transect major and minor element data reveal that igneous crystallization trends are preserved. Normalized trace element data reveal depletion in Ti, Nb, Hf, Zr in plagioclase and corresponding enrichment in orthopyroxene. Orthopyroxene in NWA 15118 does not plot on the Y versus Ti array formed by diogenite orthopyroxenes, which have a higher Ti/Y ratio. The calculated melt composition in equilibrium with NWA 15118 plagioclase has lower Ti/Y, Ti/Yb, and La/Sm ratios than melts in equilibrium with diogenite orthopyroxenes; differences in the melt compositions cannot be accounted for by the choice of partition coefficients or by single-stage magmatic processes. Therefore, we argue that NWA 15118 and diogenites are not complementary cumulates that crystallized simultaneously from a global Vestan magma ocean. Furthermore, the modeled evolution curve of such a magma ocean does not produce the composition of NWA 15118 plagioclase equilibrium melts in Ti-Y-Yb space, indicating that NWA 15118 is unlikely to have been a primary flotation crust of a global magma ocean. Our findings suggest that the incompatible trace element composition of NWA 15118 likely reflects more complex, multistage magmatic processes and/or source heterogeneities than envisioned in geochemistry-based HED petrogenetic models proposed to date.</p>","PeriodicalId":18555,"journal":{"name":"Meteoritics & Planetary Science","volume":"60 1","pages":"103-123"},"PeriodicalIF":2.2,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/maps.14292","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143111134","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":"Shocked quartzite clasts with transverse fractures from Araguainha impact structure, Brazil","authors":"David T. King Jr,&nbsp;Michael R. Rampino,&nbsp;Lucille W. Petruny","doi":"10.1111/maps.14290","DOIUrl":"https://doi.org/10.1111/maps.14290","url":null,"abstract":"<p>The central uplift area of Araguainha impact structure (Brazil) includes a quartzite pebble- and cobble-bearing stratigraphic facies that have been profoundly affected by impact processes. These quartzite clasts have been studied previously for their planar deformation features (PDFs), but not with regard to their noteworthy transverse fractures. Petrographic study of transverse fractures within seven selected impact-affected cobbles from the conglomeratic fluvial facies of the target Devonian Furnas Formation (near the central uplift of Araguainha impact structure) has revealed that there is a micro-breccia within these transverse fractures, and this micro-breccia originated by comminution of the host cobble. Further, the transverse fractures in these cobbles have different styles (well-defined, poorly defined, complex, and diffuse) and are evidently post-shock, brittle deformation features. We suggest that a late compression-stage process, perhaps collapse of the central peak, may be responsible for the development of these transverse fractures.</p>","PeriodicalId":18555,"journal":{"name":"Meteoritics & Planetary Science","volume":"60 1","pages":"124-132"},"PeriodicalIF":2.2,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143119071","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":"Zirconium isotope composition indicates s-process depletion in samples returned from asteroid Ryugu","authors":"Maria Schönbächler,&nbsp;Manuela A. Fehr,&nbsp;Tetsuya Yokoyama,&nbsp;Ikshu Gautam,&nbsp;Nao Nakanishi,&nbsp;Yoshinari Abe,&nbsp;Jérôme Aléon,&nbsp;Conel Alexander,&nbsp;Sachiko Amari,&nbsp;Yuri Amelin,&nbsp;Ken-ichi Bajo,&nbsp;Martin Bizzarro,&nbsp;Audrey Bouvier,&nbsp;Richard W. Carlson,&nbsp;Marc Chaussidon,&nbsp;Byeon-Gak Choi,&nbsp;Nicolas Dauphas,&nbsp;Andrew M. Davis,&nbsp;Tommaso Di Rocco,&nbsp;Wataru Fujiya,&nbsp;Ryota Fukai,&nbsp;Makiko K. Haba,&nbsp;Yuki Hibiya,&nbsp;Hiroshi Hidaka,&nbsp;Hisashi Homma,&nbsp;Peter Hoppe,&nbsp;Gary R. Huss,&nbsp;Kiyohiro Ichida,&nbsp;Tsuyoshi Iizuka,&nbsp;Trevor Ireland,&nbsp;Akira Ishikawa,&nbsp;Shoichi Itoh,&nbsp;Noriyuki Kawasaki,&nbsp;Noriko T. Kita,&nbsp;Koki Kitajima,&nbsp;Thorsten Kleine,&nbsp;Shintaro Komatani,&nbsp;Alexander N. Krot,&nbsp;Ming-Chang Liu,&nbsp;Yuki Masuda,&nbsp;Mayu Morita,&nbsp;Kazuko Motomura,&nbsp;Frédéric Moynier,&nbsp;Izumi Nakai,&nbsp;Kazuhide Nagashima,&nbsp;Ann Nguyen,&nbsp;Larry Nittler,&nbsp;Morihiko Onose,&nbsp;Andreas Pack,&nbsp;Changkun Park,&nbsp;Laurette Piani,&nbsp;Liping Qin,&nbsp;Sara Russell,&nbsp;Naoya Sakamoto,&nbsp;Lauren Tafla,&nbsp;Haolan Tang,&nbsp;Kentaro Terada,&nbsp;Yasuko Terada,&nbsp;Tomohiro Usui,&nbsp;Sohei Wada,&nbsp;Meenakshi Wadhwa,&nbsp;Richard J. Walker,&nbsp;Katsuyuki Yamashita,&nbsp;Qing-Zhu Yin,&nbsp;Shigekazu Yoneda,&nbsp;Edward D. Young,&nbsp;Hiroharu Yui,&nbsp;Ai-Cheng Zhang,&nbsp;Tomoki Nakamura,&nbsp;Hiroshi Naraoka,&nbsp;Takaaki Noguchi,&nbsp;Ryuji Okazaki,&nbsp;Kanako Sakamoto,&nbsp;Hikaru Yabuta,&nbsp;Masanao Abe,&nbsp;Akiko Miyazaki,&nbsp;Aiko Nakato,&nbsp;Masahiro Nishimura,&nbsp;Tatsuaki Okada,&nbsp;Toru Yada,&nbsp;Kasumi Yogata,&nbsp;Satoru Nakazawa,&nbsp;Takanao Saiki,&nbsp;Satoshi Tanaka,&nbsp;Fuyuto Terui,&nbsp;Yuichi Tsuda,&nbsp;Sei-ichiro Watanabe,&nbsp;Makoto Yoshikawa,&nbsp;Shogo Tachibana,&nbsp;Hisayoshi Yurimoto","doi":"10.1111/maps.14279","DOIUrl":"https://doi.org/10.1111/maps.14279","url":null,"abstract":"<p>Nucleosynthetic isotope variations are powerful tracers to determine genetic relationships between meteorites and planetary bodies. They can help to link material collected by space missions to known meteorite groups. The Hayabusa 2 mission returned samples from the Cb-type asteroid (162173) Ryugu. The mineralogical, chemical, and isotopic characteristics of these samples show strong similarities to carbonaceous chondrites and in particular CI chondrites. The nucleosynthetic isotope compositions of Ryugu overlap with CI chondrites for several elements (e.g., Cr, Ti, Fe, and Zn). In contrast to these isotopes, which are of predominately supernovae origin, <i>s</i>-process variations in Mo isotope data are similar to those of carbonaceous chondrites, but even more <i>s-</i>process depleted. To further constrain the origin of this depletion and test whether this signature is also present for other <i>s</i>-process elements, we report Zr isotope compositions for three bulk Ryugu samples (A0106, A0106-A0107, C0108) collected from the Hayabusa 2 mission. The data are complemented with that of terrestrial rock reference materials, eucrites, and carbonaceous chondrites. The Ryugu samples are characterized by distinct ⁹⁶Zr enrichment relative to Earth, indicative of a <i>s</i>-process depletion. Such depletion is also observed for carbonaceous chondrites and eucrites, in line with previous Zr isotope work, but it is more extreme in Ryugu, as observed for Mo isotopes. Since <i>s</i>-process Zr and Mo are coupled in mainstream SiC grains, these distinct <i>s-</i>process variations might be due to SiC grain depletion in the analyzed materials, potentially caused by incomplete sample digestion, because the Ryugu samples were dissolved on a hotplate only to avoid high blank levels for other elements (e.g., Cr). However, local depletion of SiC grains cannot be excluded. An alternative, equally possible scenario is that aqueous alteration redistributed anomalous, <i>s</i>-process-depleted, Zr on a local scale, for example, into Ca-phosphates or phyllosilicates.</p>","PeriodicalId":18555,"journal":{"name":"Meteoritics & Planetary Science","volume":"60 1","pages":"3-16"},"PeriodicalIF":2.2,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/maps.14279","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143118981","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 influence of ALH 84001 on our understanding of the origin and evolution of Mars","authors":"Kevin Righter","doi":"10.1111/maps.14289","DOIUrl":"https://doi.org/10.1111/maps.14289","url":null,"abstract":"<p>ALH 84001 is an orthopyroxenite that is the oldest known Martian meteorite. Given this rock type and age, and the possible source locations, ALH 84001 represents an opportunity to learn more about basic geologic relations in the Martian highlands in the southern hemisphere. Its orthopyroxene-rich mineralogy is unique and also includes C-, S-, P-bearing minerals. ALH 84001 can provide constraints on chronology, geology and surface features, crust formation, paleomagnetism, weathering, climate, magmatism, and interior structure. When it was recognized to be of Martian origin (~1994), there were ~12 known Martian meteorite samples. That number is now &gt;150, with only one other meteorite (NWA 7034) having clasts that are similar in age to ALH 84001. Thus, it remains a unique sample and continues to provide opportunities to understand this early period of Martian history.</p>","PeriodicalId":18555,"journal":{"name":"Meteoritics & Planetary Science","volume":"60 1","pages":"74-102"},"PeriodicalIF":2.2,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/maps.14289","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143117954","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":"2004 Barringer Medal for Peter Schultz","authors":"Dave Crawford","doi":"10.1111/maps.14286","DOIUrl":"https://doi.org/10.1111/maps.14286","url":null,"abstract":"","PeriodicalId":18555,"journal":{"name":"Meteoritics & Planetary Science","volume":"59 12","pages":"E9-E10"},"PeriodicalIF":2.2,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142861562","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":"EH6 enstatite chondrites Northwest Africa 7976 and Northwest Africa 12945: Implications for EH chondrite metamorphism","authors":"Mabel L. Gray,&nbsp;Michael K. Weisberg,&nbsp;Steven J. Jaret,&nbsp;Denton S. Ebel","doi":"10.1111/maps.14287","DOIUrl":"https://doi.org/10.1111/maps.14287","url":null,"abstract":"<p>The enstatite chondrite class is known to have complex thermal histories, often interpreted to include impact melting and shock metamorphism. Highly equilibrated (type 6) EH group enstatite chondrites are rare and thought to have formed through collisional heating. We studied two EH6 chondrites, NWA 7976 and NWA 12945, for their textural, chemical, and mineralogical characteristics. The samples we studied contain subhedral to anhedral grains of enstatite and plagioclase, suggesting solid-state recrystallization. They show low degrees of shock and no evidence of shock melting. Additionally, the ubiquitous occurrence of daubréelite exsolution lamellae in troilite and the Ni content of schreibersite suggest slow cooling at greater burial depths in the parent body, rather than rapid cooling as a result of an impact event. Based on the characteristics and scarcity of type 6 EH chondrites, and the ubiquitous shock effects and melt rocks in the enstatite chondrite class, we conclude that the unshocked NWA 7976 and NWA 12945 were formed by heat derived from impact melt sheets, analogous to contact metamorphism.</p>","PeriodicalId":18555,"journal":{"name":"Meteoritics & Planetary Science","volume":"60 1","pages":"51-63"},"PeriodicalIF":2.2,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143114754","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":"A reappraisal of the petrogenesis of Apollo 17 lunar dunites 72415-72417: Relics of the deep lunar mantle?","authors":"K. K. Bhanot,&nbsp;H. Downes,&nbsp;B. G. Rider-Stokes,&nbsp;E. S. Jennings,&nbsp;M. Anand,&nbsp;J. F. Snape,&nbsp;M. J. Whitehouse","doi":"10.1111/maps.14269","DOIUrl":"https://doi.org/10.1111/maps.14269","url":null,"abstract":"<p>Lunar dunite samples 72415–72417, collected by Apollo 17 astronauts from a South Massif boulder in the Taurus–Littrow valley, are crushed breccias composed of several types of olivine- and clinopyroxene-rich clasts, some of which are (or contain) intergrowths of Cr-spinel and pyroxenes or plagioclase. Among the clasts are ellipsoidal symplectites of Cr-spinel and pyroxene, up to 300 μm in diameter, which have bulk compositions consistent with those of olivine + garnet. These symplectites are inferred to originally have been olivine + Mg-Cr-rich garnet (pyrope–uvarovite) that formed deep in the lunar mantle and were subsequently transported closer to the lunar surface (spinel- or plagioclase-peridotite stability fields), perhaps during gravitationally driven overturn. Abundant microsymplectite (30 μm diameter) intergrowths of Cr-spinel and pyroxene inside olivine grains, many associated with inclusions of plagioclase and augite, formed during a later decompression event (perhaps excavation to the lunar surface). These inclusions have not previously been recorded in these samples and could be responsible for earlier reports of igneous zoning in olivine. Electron backscatter diffraction data show evidence of high shock pressures (&gt;50 GPa), which are inferred to have occurred during the impact which excavated the dunites from the shallow anorthite-bearing lunar mantle. Apatite veinlets post-date the shock metamorphism and have been dated to 3983 ± 72 Ma and 3913 ± 118 Ma by the U–Pb method. This age is consistent with that inferred for the Imbrium impact basin, suggesting that the dunite was finally excavated from the mantle during formation of the Imbrium basin.</p>","PeriodicalId":18555,"journal":{"name":"Meteoritics & Planetary Science","volume":"59 12","pages":"3129-3149"},"PeriodicalIF":2.2,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/maps.14269","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142861308","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":"Rapid colonization of a space-returned Ryugu sample by terrestrial microorganisms","authors":"Matthew J. Genge,&nbsp;Natasha Almeida,&nbsp;Matthias Van Ginneken,&nbsp;Lewis Pinault,&nbsp;Louisa J. Preston,&nbsp;Penelope J. Wozniakiewicz,&nbsp;Hajime Yano","doi":"10.1111/maps.14288","DOIUrl":"https://doi.org/10.1111/maps.14288","url":null,"abstract":"<p>The presence of microorganisms within meteorites has been used as evidence for extraterrestrial life, however, the potential for terrestrial contamination makes their interpretation highly controversial. Here, we report the discovery of rods and filaments of organic matter, which are interpreted as filamentous microorganisms, on a space-returned sample from 162173 Ryugu recovered by the Hayabusa 2 mission. The observed carbonaceous filaments have sizes and morphologies consistent with microorganisms and are spatially associated with indigenous organic matter. The abundance of filaments changed with time and suggests the growth and decline of a prokaryote population with a generation time of 5.2 days. The population statistics indicate an extant microbial community originating through terrestrial contamination. The discovery emphasizes that terrestrial biota can rapidly colonize extraterrestrial specimens even given contamination control precautions. The colonization of a space-returned sample emphasizes that extraterrestrial organic matter can provide a suitable source of metabolic energy for heterotrophic organisms on Earth and other planets.</p>","PeriodicalId":18555,"journal":{"name":"Meteoritics & Planetary Science","volume":"60 1","pages":"64-73"},"PeriodicalIF":2.2,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/maps.14288","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143114755","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":"Petrogenesis of lunar granulitic breccia meteorites Northwest Africa 15062 and 15063","authors":"Zhipeng Xia,&nbsp;Baochen Yang,&nbsp;Bowen Si,&nbsp;Guozhu Chen,&nbsp;Xi Wang,&nbsp;Hongyi Chen,&nbsp;Chuantong Zhang,&nbsp;Bingkui Miao","doi":"10.1111/maps.14285","DOIUrl":"https://doi.org/10.1111/maps.14285","url":null,"abstract":"<p>We present petrology and mineralogy for two lunar granulitic breccia meteorites that were detected in Northwest Africa (NWA), the samples NWA 15062 and NWA 15063. The fragments primarily consist of plagioclase and olivine mineral clasts, with minor amounts of anorthosite clasts and one troctolite clast. The anorthosite clasts are dominated by plagioclase/maskelynite, with minor olivine and pyroxene. A troctolite clast, composed of olivine and maskelynite, occurs in NWA 15063. The olivine clasts display mosaic extinction and usually have a homogeneous Mg-rich composition. However, all olivine mineral clasts exhibit two distinct ranges of their major element composition (Mg#: 85–88 and 77–78, respectively). Large individual plagioclase clasts show heterogeneous compositions (Ab content: 2.5–4.8) and have different Raman peak positions in different domains. The matrix of the meteorites appears semitransparent and is composed of olivine and pyroxene aggregates associated with maskelynite, constituting a granoblastic texture. Pyroxenes of the matrix are dominantly enstatites, associated with a few augites. Both meteorite samples exhibit shock-induced melt veins ranging from 50 to 200 μm width. These melt veins traverse the entire samples and contain rare, very fine-grained (2–3 μm) Mg-rich olivine clasts (Mg# = 90–93) and mafic silicate glass. Some Cr-spinel grains exhibit slight compositional zonation, characterized by a magnesium-rich core (Mg# = 56, Cr# = 23) and Cr-rich rims (Mg# = 50, Cr# = 28), with decomposition at the edges. The significantly differing Mg# contents of the mafic silicate minerals in the matrix, lithic clasts, and mineral clasts of the two meteorites indicate a diverse origin of the clasts. Based on their petrology, mineral chemistry, and bulk composition, NWA 15062 and NWA 15063 are classified as anorthositic troctolitic granulitic polymict breccia. Textural evidence suggests that the parent rocks of NWA 15062 and NWA 15063 were affected by high pressure of up to 30 GPa during impact-induced shock metamorphism, causing crystal structure deformation in olivine and the transformation of plagioclase to maskelynite. During cooling from peak temperatures of 1600–1700°C, the coarse-grained maskelynite mineral clasts were partially devitrified, and the granoblastic texture of the matrix was developed. Mg-rich anorthosite was formed before this shock event. Cr-spinel was formed in a troctolitic melt, which was probably differentiated after the crystallization of anorthite and magnesium-rich olivine. However, the possibility of the formation of the Mg-rich melt through interaction with the lunar anorthositic crust cannot be ruled out. The meteorite NWA 15062/15063 strongly resembles the textural, chemical, and mineralogical characteristics of the NWA 5744 meteorite group. Therefore, we interpret the two samples as a new member of the NWA 5744 meteorite group.</p>","PeriodicalId":18555,"journal":{"name":"Meteoritics & Planetary Science","volume":"60 1","pages":"32-50"},"PeriodicalIF":2.2,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143114358","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":"2007 Service Award for John Schutt","authors":"Ralph P. Harvey","doi":"10.1111/maps.14281","DOIUrl":"https://doi.org/10.1111/maps.14281","url":null,"abstract":"&lt;p&gt;It is an honor to introduce (albeit 17 years late) the recipient of the Meteoritical Society's 2007 Service Award, Dr. John Schutt. I have had the great privilege of working with John, or “Johnny Alpine” as he has often been called, for almost 40 years. After all that time, I have an endless supply of anecdotes I could share, but a great number of you reading this have your own, so I will restrain myself. Suffice it to say that my first meeting with John was when the late Bill Cassidy (founder of the US Antarctic Search for Meteorites program, or ANSMET) sent me to his dorm room in McMurdo, where I found a sweating, smelly, heaving John deep in the grasp of that marvelous contagion we call “the McMurdo Crud.” Ever the gentleman, he coughed into his hands for 15–20 seconds, then with a very crooked grin offered me his hand in friendship. Things have gone uphill ever since.&lt;/p&gt;&lt;p&gt;As is standard fare for these awards, many of you either know John or have at least heard of him. What is different this time is a matter of intensity—many of us have literally, at one moment or another, trusted John with our lives. No offense, Barringer and Leonard and Nier Awards, but Johnny Alpine is someone who deserves respect on an entirely different level.&lt;/p&gt;&lt;p&gt;So what are John's accomplishments? Let us start with meteoritics. John was the first dedicated mountaineer to work with the US Antarctic Search for Meteorites program, starting in 1980 and continuing to this day. That puts him at well-over 40 field seasons years and counting, of involvement with ANSMET. He has spent at least 5 full years of his life camping out on the East Antarctic ice sheet. The result is that John can probably claim to be the world's premier meteorite recovery specialist, having recovered more meteorites than any single person in history. ANSMET does not keep track of who found individual specimens in any given season, but making reasonable estimates, I'd put the number for John somewhere around 4000 or 5000. For perspective, this is about two times the cumulative number of known meteorites found before systematic Antarctic collection began. Similarly, I think no individual in history has personally recovered more samples of Mars; in some sense, he is to Mars what the Apollo astronauts were to the Moon. And perhaps the most astonishing feature of this body of work is that every single sample has been made available to the world's science community free of charge, and curated at the highest level, with neither John nor any other ANSMET personnel getting favored access to the specimens.&lt;/p&gt;&lt;p&gt;In addition to his work as ANSMET's mountaineer he has contributed tens of thousands of hours beyond those “normal” duties. John single-handedly dragged ANSMET into mapping find locations, ultimately created AMLAMP (Antarctic Meteorite Location and Mapping Program), which preserves and makes available the geographical information related to Antarctic meteorite finds. This was done originally withou","PeriodicalId":18555,"journal":{"name":"Meteoritics & Planetary Science","volume":"59 12","pages":"E7-E8"},"PeriodicalIF":2.2,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/maps.14281","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142860790","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}