Meteoritics & Planetary Science最新文献

{"title":"Impact origin of lunar zircon melt inclusions in Apollo impact melt breccia 14311","authors":"Carolyn A. Crow,&nbsp;Cynthia Tong,&nbsp;Timmons M. Erickson,&nbsp;Desmond E. Moser,&nbsp;Aaron S. Bell,&nbsp;Nigel M. Kelly,&nbsp;Tabb C. Prissel,&nbsp;Brendt C. Hyde","doi":"10.1111/maps.14162","DOIUrl":"https://doi.org/10.1111/maps.14162","url":null,"abstract":"<p>Investigations of trapped melt inclusions in minerals can yield insights into the compositions and conditions of parent magmas. These insights are particularly important for detrital grains like many of the lunar zircons found in samples returned by the Apollo missions. However, unlike their terrestrial counterparts, lunar zircons have potentially been exposed to billions of years of impact bombardment. Samples from terrestrial impact structures and impact shock experiments have revealed that deformation during an impact event produces melt and glass blebs that can mimic igneous melt inclusions in both morphology and composition. We have undertaken a geochemical and textural investigation of zircons from Apollo impact melt breccia 14311 to assess their formation mechanisms. The association of trapped melts with shock microtwins and monomineralic melt compositions suggests some inclusions formed as a result of the high pressures and temperatures of impact shock. All other inclusions in this study are associated with curviplanar features, planar features, crystal plastic deformation, or embayments (large regions in contact with adjacent melts or minerals) suggesting that they are not igneous melt inclusions. While these textures can be produced in tectonic environments, impacts are a likely formation mechanism since impacts are the main driver of tectonics on the Moon. The results of this study demonstrate that a combination of textural and compositional analyses can be employed distinguish between igneous melt inclusions and melt blebs in zircons from impact environments.</p>","PeriodicalId":18555,"journal":{"name":"Meteoritics & Planetary Science","volume":"59 7","pages":"1509-1522"},"PeriodicalIF":2.2,"publicationDate":"2024-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141583950","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":"Provenance constraints on the Late Triassic ejecta layer from Churchwood Quarry, SW England: An impactite suite from Manicouagan","authors":"Maree McGregor,&nbsp;John G. Spray,&nbsp;Christopher R. M. McFarlane","doi":"10.1111/maps.14172","DOIUrl":"https://doi.org/10.1111/maps.14172","url":null,"abstract":"<p>In situ LA-ICP-MS/MS U-Pb and Rb-Sr geochronology combined with geochemical analysis and electron microscopy have been performed on ejecta components sampled from the Mid-to-Late Triassic Mercia Mudstone Group at Churchwood Quarry, SW England. The layer comprises altered impact spherules, melt-rich and fragment-rich accreted grain clusters (AGCs), along with shocked mineral phases. Late Triassic ages are obtained: a U-Pb age of 219 ± 72 Ma from variably shock-metamorphosed apatite and a Rb-Sr age of 213 ± 31 Ma from melt-rich AGCs. A post-depositional U-Pb age of 200 ± 7.5 Ma obtained from the carbonate host matrix correlates with an early Jurassic dolomitization event associated with regional marine transgression. Several links to the Manicouagan impact structure, Canada, are identified that complement previous provenance studies: (1) rare earth element compositions of impact spherules and melt-rich AGCs match those of the Manicouagan impact melt sheet; (2) the preservation of Archean and Paleo- to Neoproterozoic target rock U-Pb ages in zircon and apatite match those recorded within Manicouagan basement lithologies; and (3) impact spherules and melt-rich AGCs record initial ⁸⁷Sr/⁸⁶Sr compositions that overlap with those of the Manicouagan impact melt sheet and the target rocks involved in their generation.</p>","PeriodicalId":18555,"journal":{"name":"Meteoritics & Planetary Science","volume":"59 7","pages":"1632-1657"},"PeriodicalIF":2.2,"publicationDate":"2024-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/maps.14172","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141584129","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":"Low-temperature thermal and physical properties of lunar meteorites","authors":"R. J. Macke,&nbsp;C. P. Opeil,&nbsp;D. T. Britt,&nbsp;G. J. Consolmagno,&nbsp;A. Irving","doi":"10.1111/maps.14171","DOIUrl":"10.1111/maps.14171","url":null,"abstract":"<p>Lunar meteorites are the most diverse and readily available specimens for the direct laboratory study of lunar surface materials. In addition to informing us about the composition and heterogeneity of lunar material, measurements of their thermo-physical properties provide data necessary to inform the models of the thermal evolution of the lunar surface and provide data on fundamental physical properties of the surface material for the design of exploration and resource extraction hardware. Low-temperature data are particularly important for the exploration of low-temperature environments of the lunar poles and permanently shadowed regions. We report low-temperature-specific heat capacity, thermal conductivity, and linear thermal expansion for six lunar meteorites: Northwest Africa [NWA] 5000, NWA 6950, NWA 8687, NWA 10678, NWA 11421, and NWA 11474, over the range 5 ≤ T ≤ 300 K. From these, we calculate thermal inertia and thermal diffusivity as functions of temperature. Additionally, heat capacities were measured for 15 other lunar meteorites, from which we calculate their Debye temperature and effective molar mass.</p>","PeriodicalId":18555,"journal":{"name":"Meteoritics & Planetary Science","volume":"59 7","pages":"1610-1631"},"PeriodicalIF":2.2,"publicationDate":"2024-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140691740","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":"Coevolution of phyllosilicate, carbon, sulfide, and apatite in Ryugu's parent body","authors":"Zack Gainsforth,&nbsp;Gerardo Dominguez,&nbsp;Kana Amano,&nbsp;Megumi Matsumoto,&nbsp;Yuri Fujioka,&nbsp;Eiichi Kagawa,&nbsp;Tomoki Nakamura,&nbsp;Shogo Tachibana,&nbsp;Tomoyo Morita,&nbsp;Mizuha Kikuiri,&nbsp;Hisayoshi Yurimoto,&nbsp;Takaaki Noguchi,&nbsp;Ryuji Okazaki,&nbsp;Hikaru Yabuta,&nbsp;Hiroshi Naraoka,&nbsp;Kanako Sakamoto,&nbsp;Toru Yada,&nbsp;Masahiro Nishimura,&nbsp;Aiko Nakato,&nbsp;Akiko Miyazaki,&nbsp;Kasumi Yogata,&nbsp;Masano Abe,&nbsp;Tatsuaki Okada,&nbsp;Tomohiro Usui,&nbsp;Makoto Yoshikawa,&nbsp;Takanao Saiki,&nbsp;Satoshi Tanaka,&nbsp;Fuyuto Terui,&nbsp;Satoru Nakazawa,&nbsp;Sei-ichiro Watanabe,&nbsp;Yuichi Tsuda,&nbsp;Hayabusa2 Initial Analysis Stone Team","doi":"10.1111/maps.14161","DOIUrl":"10.1111/maps.14161","url":null,"abstract":"<p>We analyzed an asteroid Ryugu sample returned to Earth by JAXA's Hayabusa2 mission using nanoIR, SEM, and TEM microscopy. We identified multiple distinct carbon reservoirs within the phyllosilicate matrix and demonstrate infrared spectral affinities for some of the carbon to insoluble organic matter (IOM). TEM studies of Ryugu samples have allowed us to better understand the interrelationship between the crystallographic orientations of phyllosilicates and the secondary minerals such as carbonate, sulfide, and apatite. Transport of elements provides a unifying theme for understanding these interrelationships.</p>","PeriodicalId":18555,"journal":{"name":"Meteoritics & Planetary Science","volume":"59 8","pages":"2073-2096"},"PeriodicalIF":2.2,"publicationDate":"2024-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/maps.14161","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140701183","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":"Brecciation at the grain scale within the lithologies of the Winchcombe Mighei-like carbonaceous chondrite","authors":"Luke Daly,&nbsp;Martin D. Suttle,&nbsp;Martin R. Lee,&nbsp;John Bridges,&nbsp;Leon Hicks,&nbsp;Pierre-Etienne M. C. Martin,&nbsp;Cameron J. Floyd,&nbsp;Laura E. Jenkins,&nbsp;Tobias Salge,&nbsp;Ashley J. King,&nbsp;Natasha V. Almeida,&nbsp;Diane Johnson,&nbsp;Patrick W. Trimby,&nbsp;Haithem Mansour,&nbsp;Fabian B. Wadsworth,&nbsp;Gavyn Rollinson,&nbsp;Matthew J. Genge,&nbsp;James Darling,&nbsp;Paul A. J. Bagot,&nbsp;Lee F. White,&nbsp;Natasha R. Stephen,&nbsp;Jennifer T. Mitchell,&nbsp;Sammy Griffin,&nbsp;Francesca M. Willcocks,&nbsp;Rhian Jones,&nbsp;Sandra Piazolo,&nbsp;Joshua F. Einsle,&nbsp;Alice Macente,&nbsp;Lydia J. Hallis,&nbsp;Aine O'Brien,&nbsp;Paul F. Schofield,&nbsp;Sara S. Russell,&nbsp;Helena Bates,&nbsp;Caroline Smith,&nbsp;Ian Franchi,&nbsp;Lucy V. Forman,&nbsp;Phil A. Bland,&nbsp;David Westmoreland,&nbsp;Iain Anderson,&nbsp;Richard Taylor,&nbsp;Mark Montgomery,&nbsp;Mark Parsons,&nbsp;Jérémie Vasseur,&nbsp;Matthias van Ginneken,&nbsp;Penelope J. Wozniakiewicz,&nbsp;Mark J. Burchell,&nbsp;Daniel Hallatt,&nbsp;Luke S. Alesbrook,&nbsp;Vassilia Spathis,&nbsp;Richard Worden,&nbsp;Julie Behnsen,&nbsp;Kate Black,&nbsp;the UK Fireball Alliance","doi":"10.1111/maps.14164","DOIUrl":"10.1111/maps.14164","url":null,"abstract":"<p>The Mighei-like carbonaceous (CM) chondrites have been altered to various extents by water–rock reactions on their parent asteroid(s). This aqueous processing has destroyed much of the primary mineralogy of these meteorites, and the degree of alteration is highly heterogeneous at both the macroscale and nanoscale. Many CM meteorites are also heavily brecciated juxtaposing clasts with different alteration histories. Here we present results from the fine-grained team consortium study of the Winchcombe meteorite, a recent CM chondrite fall that is a breccia and contains eight discrete lithologies that span a range of petrologic subtypes (CM2.0–2.6) that are suspended in a cataclastic matrix. Coordinated multitechnique, multiscale analyses of this breccia reveal substantial heterogeneity in the extent of alteration, even in highly aqueously processed lithologies. Some lithologies exhibit the full range and can comprise nearly unaltered coarse-grained primary components that are found directly alongside other coarse-grained components that have experienced complete pseudomorphic replacement by secondary minerals. The preservation of the complete alteration sequence and pseudomorph textures showing tochilinite–cronstedtite intergrowths are replacing carbonates suggest that CMs may be initially more carbonate rich than previously thought. This heterogeneity in aqueous alteration extent is likely due to a combination of microscale variability in permeability and water/rock ratio generating local microenvironments as has been established previously. Nevertheless, some of the disequilibrium mineral assemblages observed, such as hydrous minerals juxtaposed with surviving phases that are typically more fluid susceptible, can only be reconciled by multiple generations of alteration, disruption, and reaccretion of the CM parent body at the grain scale.</p>","PeriodicalId":18555,"journal":{"name":"Meteoritics & Planetary Science","volume":"59 5","pages":"1068-1100"},"PeriodicalIF":2.2,"publicationDate":"2024-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/maps.14164","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140703090","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":"Origin of a polymict, mega-clast-bearing impact breccia in the crater floor of Wetumpka Impact Structure, Elmore County, Alabama: Insights from surface outcrops and a drill core","authors":"Neeraja S. Chinchalkar,&nbsp;David T. King Jr,&nbsp;Willis E. Hames","doi":"10.1111/maps.14169","DOIUrl":"10.1111/maps.14169","url":null,"abstract":"<p>Wetumpka impact structure is a Late Cretaceous, marine-target impact crater of about 5 km diameter. The apparent crater rim is mostly made of crystalline local basement, and the apparent crater floor consists of a mixed sediments of target lithology. These sediments are the provenance of the crater-filling impactite sands, overlying trans-crater slide unit, and the capping polymict impact breccia deposit, often referred to by previous workers as “central polymict breccia.” The unit has been known to contain elongated mega-clasts of up to tens of meters in size. This study attempted to understand the mode of emplacement of this polymict breccia, which occurs in some places on the apparent crater floor and resembles a polymict proximal ejecta deposit. This work also reports the first documentation of rare, potential impact spherules in the polymict impact breccia, interpreted to be a part of distal ejecta. The presence of large, decimeter-sized clasts in the breccia can be best explained by the movement of overturned rim flap forming part of proximal ejecta from the crater rim to the apparent crater floor during early modification stage of impact cratering. Our work highlights the bimodal clast size distribution of the polymict breccia, and so we propose that the term “mega-clast-bearing impact breccia” be used for this unit. We attribute a generally steep orientation of the decameter sized clasts to primary imbrication during emplacement. The emplacement of this breccia is interpreted as associated with the ejecta emplacement process that occurred before the return of marine resurge.</p>","PeriodicalId":18555,"journal":{"name":"Meteoritics & Planetary Science","volume":"59 7","pages":"1559-1576"},"PeriodicalIF":2.2,"publicationDate":"2024-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/maps.14169","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140709559","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":"Ries magnetic mineralogy: Exploring impact and post-impact evolution of crater magnetism","authors":"Bruno Daniel Leite Mendes,&nbsp;Agnes Kontny,&nbsp;Katarzyna Dudzisz,&nbsp;Franziska D. H. Wilke","doi":"10.1111/maps.14170","DOIUrl":"10.1111/maps.14170","url":null,"abstract":"<p>Large-scale impact events are some of the most catastrophic and instantaneous geological processes in nature, and leave in their wake conspicuous geological structures with characteristic magnetic anomalies. Despite magnetic anomalies in craters being well-documented, their relationship with the magnetic mineral composition of the target and impactites is not always straightforward. Furthermore, the influence of impact shock and post-impact events in the magnetism of natural craters remains elusive. In the Ries crater, Germany, the negative magnetic anomalies are attributed to a reverse polarity remanent magnetization in the impact-melt bearing lithologies. We report new chemical, rock-, and mineral-magnetic data from the shocked basement and impactites, from surface samples, NR73 and SUBO-18 boreholes, and explore how temperature and hydrothermalism may influence the magnetic mineralogy in the crater. We identified shocked, pure magnetite in the basement, and low-cation substituted magnetite in the impactites as the main magnetic carriers. The shocked basement is demagnetized but remains largely unaltered by post-impact hydrothermalism, while the impactites show weak magnetization and are extensively altered by neutral-to-reducing post-impact hydrothermalism. We suggest that the magnetic mineralogy of the demagnetized uplifted basement may contribute significantly to the magnetic anomaly variation, in line with recent findings from the Chicxulub peak-ring.</p>","PeriodicalId":18555,"journal":{"name":"Meteoritics & Planetary Science","volume":"59 7","pages":"1577-1609"},"PeriodicalIF":2.2,"publicationDate":"2024-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/maps.14170","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140708950","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":"Pressure–temperature–time controls on shock vein formation within the Steen River impact structure","authors":"Randy G. Hopkins,&nbsp;John. G. Spray,&nbsp;Erin L. Walton","doi":"10.1111/maps.14168","DOIUrl":"10.1111/maps.14168","url":null,"abstract":"<p>Thermodynamic modeling has been applied to determine pressure–temperature–time conditions leading to shock vein formation during the passage of a natural shock wave generated by hypervelocity impact. The approach is novel in considering both shock front and rarefaction pressures, as well as simultaneously forming and cooling the shock veins via two-dimensional steady-state conduction. Model results are tested using shock veins developed in granitic rocks that constitute the central uplift of the Steen River impact structure in Canada. Here, two variants of majoritic garnet were generated in different settings: (1) along the margins of shock veins due to pargasite and biotite breakdown (accompanied by maskelynite formation), and (2) within the originally molten shock vein matrix as newly grown crystals. We determine that during shock vein formation, the shock front pressure and wave width at the reconstructed sample location were 18 GPa and 830 m, respectively, with a dwell time of 160 ms. Intra-vein melting at 2150°C was attained within 1 μs. Melt cooled to the solidus in 150 ms following shock front passage. Majoritic garnet formation was facilitated by the high temperatures realized within the veins as a result of frictional melting that accompanied shock loading. The calculated pressure–temperature–time (<i>P</i>–<i>T</i>–<i>t</i>) path provides constraints on the formation conditions of majoritic garnet at Steen River. The model results independently support previously determined <i>P</i>–<i>T</i> conditions based on mineral stability fields. The vein margin garnets (35–39 mole% majorite) and maskelynite formed first under higher <i>P</i>–<i>T</i> conditions for a longer duration (36 ms). The matrix garnets (11–22 mole% majorite) crystallized from melt under lower <i>P</i>–<i>T</i> conditions and for a shorter duration (22 ms). Our results indicate that shock pressure alone should not be used as a basis for shock classification. Instead, the interplay between pressure and temperature with time and the duration of shock immersion (dwell) must be considered.</p>","PeriodicalId":18555,"journal":{"name":"Meteoritics & Planetary Science","volume":"59 7","pages":"1546-1558"},"PeriodicalIF":2.2,"publicationDate":"2024-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/maps.14168","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140718580","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.14008","DOIUrl":"https://doi.org/10.1111/maps.14008","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":"59 4","pages":"i"},"PeriodicalIF":2.2,"publicationDate":"2024-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/maps.14008","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140541072","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":"2021 Elmar K. Jessberger Award for Maria Schönbächler","authors":"Rainer Wieler","doi":"10.1111/maps.14166","DOIUrl":"10.1111/maps.14166","url":null,"abstract":"","PeriodicalId":18555,"journal":{"name":"Meteoritics & Planetary Science","volume":"59 S1","pages":"A473-A474"},"PeriodicalIF":2.2,"publicationDate":"2024-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140739093","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}