Journal of Geophysical Research: Planets最新文献_第2页

Uncovering Shallow Crustal Structures of Mars Beneath the InSight Landing Site Using P-Wave Particle Motions 利用p波粒子运动揭示洞察号着陆点下的火星浅层地壳结构

IF 3.9 1区地球科学

Journal of Geophysical Research: Planets Pub Date : 2025-06-03 DOI: 10.1029/2024JE008927

Xu Wang, Ling Chen, Xin Wang

{"title":"Uncovering Shallow Crustal Structures of Mars Beneath the InSight Landing Site Using P-Wave Particle Motions","authors":"Xu Wang, Ling Chen, Xin Wang","doi":"10.1029/2024JE008927","DOIUrl":"https://doi.org/10.1029/2024JE008927","url":null,"abstract":"Studying the shallow crustal structure of Mars can offer valuable insights into the planet's geological evolution and climate changes. We designed a novel scheme to extract P-wave particle motions from low-frequency seismic events recorded by the InSight mission. By analyzing the frequency dependence of these motions, we inverted for the S-wave velocity structure in the top few kilometers beneath the landing site. Our results reveal a distinct discontinuity at a depth of approximately 0.75 km, with a 68% confidence interval of ±0.25 km, marked by an increase in S-wave velocity from around 1.34 km/s (±0.37 km/s) above to approximately 1.90 km/s (±0.18 km/s) below. The discontinuity is characterized by a sharp transition, around 0.1 km thick, rather than a broad zone. These observed features are robust with minimal influence from data processing and prior assumptions about shallower structures (within the top 0.2 km), and are consistently resolved in both multi-event stacking and single-event inversions. Together with previous observations, our findings suggest that the imaged velocity-increasing discontinuity may signify the top of relatively intact basaltic bedrock (less altered or modified by surface weathering or impact fragmentation), while the overlying structures are interpreted as a combination of Noachian-to early Hesperian-aged sediments with Hesperian and Amazonian basalts.","PeriodicalId":16101,"journal":{"name":"Journal of Geophysical Research: Planets","volume":"130 6","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144206491","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dust Lifting and Deposition Over Six Mars Years at Gale Crater, Mars, From REMS Observations and Mesoscale Simulations 火星盖尔陨石坑6年的尘埃提升和沉积，来自REMS观测和中尺度模拟

IF 3.9 1区地球科学

Journal of Geophysical Research: Planets Pub Date : 2025-06-03 DOI: 10.1029/2024JE008888

A. Vicente-Retortillo, G. M. Martinez, C. E. Newman, M. T. Lemmon, J. R. Johnson, E. L. Mason, N. O. Renno, J. A. Rodriguez-Manfredi

{"title":"Dust Lifting and Deposition Over Six Mars Years at Gale Crater, Mars, From REMS Observations and Mesoscale Simulations","authors":"A. Vicente-Retortillo, G. M. Martinez, C. E. Newman, M. T. Lemmon, J. R. Johnson, E. L. Mason, N. O. Renno, J. A. Rodriguez-Manfredi","doi":"10.1029/2024JE008888","DOIUrl":"https://doi.org/10.1029/2024JE008888","url":null,"abstract":"We present the temporal evolution of the effect of dust accumulation on two surfaces of the Curiosity rover at Gale crater during almost 4,000 sols using Rover Environmental Monitoring Station (REMS), Chemcam and Mastcam observations, and compare it with simulations of the Mars Weather Research and Forecasting Model (MarsWRF) atmospheric numerical model and environmental observations to improve our understanding of dust lifting on Mars. After almost six full Mars Years (MY), dust accumulated on the REMS UV sensor (UVS) attenuates an average of 45% of the incoming radiation. Dust accumulation on the UVS follows a seasonal cycle with gradual dust accumulation during the aphelion season followed by dust removal until Ls ∼ 300°. However, there is a strong interannual variability during the dusty season. MarsWRF simulations show that wind stress has a strong diurnal, seasonal and interannual variability; simulations of dust devil activity show a seasonal pattern that aligns with pressure drop observations, peaking also at Ls ∼ 300°. Dust lifting mechanisms are variable, with a larger relative importance of wind stress in MY 31 and 32, and of dust devils in MY 34 to 36. Dust accumulation on the Chemcam calibration target follows a very similar temporal evolution, but with a marked offset since the 2018 Global Dust Storm, suggesting that surface tilt is particularly important around intense dust storms. We characterize dust lifting mechanisms at Gale crater and quantify the effect of dust accumulation during an extraordinary dust storm on different surfaces; the observed net removal periods validate MarsWRF simulations and suggest the suitability of Gale Crater for long-term solar-powered missions.","PeriodicalId":16101,"journal":{"name":"Journal of Geophysical Research: Planets","volume":"130 6","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JE008888","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144206495","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Electromagnetic Measurements and Modeling of Rocky and Icy Crust Simulants to Support Planetary Radar Sounder Exploration 支持行星雷达测深仪探测的岩石和冰壳模拟物的电磁测量和建模

IF 3.9 1区地球科学

Journal of Geophysical Research: Planets Pub Date : 2025-06-03 DOI: 10.1029/2025JE008942

Alessandro Brin, Sebastian E. Lauro, Barbara Cosciotti, Gabriele Turchetti, Elisabetta Mattei, Elena Pettinelli

{"title":"Electromagnetic Measurements and Modeling of Rocky and Icy Crust Simulants to Support Planetary Radar Sounder Exploration","authors":"Alessandro Brin, Sebastian E. Lauro, Barbara Cosciotti, Gabriele Turchetti, Elisabetta Mattei, Elena Pettinelli","doi":"10.1029/2025JE008942","DOIUrl":"https://doi.org/10.1029/2025JE008942","url":null,"abstract":"Reliable interpretation of orbiting radar sounder observations requires a deep understanding of the electromagnetic behavior of planetary material simulants. Experimental data regarding simulants properties are rather limited, especially for icy materials, and such a lack is often overcome by using mixing models. In this work we performed dielectric and magnetic measurements on rocky granular materials and rocky/icy mixtures to characterize the regolith covering the rocky internal structure of an asteroid and the icy mixtures composing the shallow subsurface of Ganymede at planetary temperatures, and in the frequency range of interest for current and future radar sounder missions (1–100 MHz). We also compared the experimental results with those retrieved using several common mixing formulas to assess the reliability of the electromagnetic models in reproducing the properties of composite materials. Finally, we estimated the attenuation of the radar signal as a function of temperature and rocky grain volume fractions in different subsurface scenarios. Our results suggest that caution should be used in applying mixing formulas to simulate the electromagnetic properties of planetary materials, especially if a non-negligible amount of clay is present in the rocky fraction of the mixtures. Moreover, such results highlight the effect of temperature on the dielectric properties of the icy mixtures which might produce an unexpected behavior in the radar signal attenuation.","PeriodicalId":16101,"journal":{"name":"Journal of Geophysical Research: Planets","volume":"130 6","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144206496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Groundwater Sapping in Hack Crater (Mars): Geologic Evidence and Geophysical Modeling of Groundwater Stability 火星哈克陨石坑的地下水侵蚀：地下水稳定性的地质证据和地球物理模拟

IF 3.9 1区地球科学

Journal of Geophysical Research: Planets Pub Date : 2025-05-31 DOI: 10.1029/2024JE008773

B. De Toffoli, A.-C. Plesa, E. Luzzi, E. Hauber

{"title":"Groundwater Sapping in Hack Crater (Mars): Geologic Evidence and Geophysical Modeling of Groundwater Stability","authors":"B. De Toffoli, A.-C. Plesa, E. Luzzi, E. Hauber","doi":"10.1029/2024JE008773","DOIUrl":"https://doi.org/10.1029/2024JE008773","url":null,"abstract":"This study investigates Hack crater in Arabia Terra on Mars, which exhibits remarkable water-related landforms, suggesting a period of intense water activity despite lacking a connection with large-scale fluvial networks. Instead, short valleys within its walls display morphologies indicative of mass-wasting processes driven by groundwater seepage. These valley heads located at approximately −2,900 m provide insights into the groundwater table during landform development, and suggest sustained groundwater supply after the crater's formation at 3.5 Ga. For the first time, we combine geological analyses and geophysical models to investigate the depth of groundwater at this location using two independent approaches. By analyzing the locations and the topography of water-related features, we identify key events that shaped the area, from the appearance of a closed lake due to groundwater influx to its eventual disappearance. After crater excavation, groundwater influx from subsurface sources started driven by sapping processes, filled the basin, and created valleys and depositional features. The system likely persisted until groundwater reservoir exhaustion or until top-down freezing of the groundwater conduits into the crater. The basin dry-out led to the exposure of water-related morphologies to subaerial erosion. Our study provides insights into the multi-stage evolution of a Martian lake formed through groundwater sapping, offering an alternative hypothesis to surface runoff-dominated scenarios. Despite possible regional implications due to the basin's water levels matching the hypothesized global shoreline levels, caution is warranted in extrapolating these findings on a planetary scale, as surrounding craters do not exhibit comparable water-related features indicating a possibly localized phenomenon.","PeriodicalId":16101,"journal":{"name":"Journal of Geophysical Research: Planets","volume":"130 6","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JE008773","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144185877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analyzing the Mechanical Heterogeneity of the Chang'e-5 Lunar Breccia Clast: Implications for the Elastic Modulus of Lunar Rock 嫦娥五号月球角砾岩的力学非均质性分析：对月球岩石弹性模量的启示

IF 3.9 1区地球科学

Journal of Geophysical Research: Planets Pub Date : 2025-05-31 DOI: 10.1029/2024JE008849

Jiayan Nie, Siqiao Wang, Yifei Cui, Zhijun Wu, Jian He, Guodong Wang, Xiaojia Zeng

{"title":"Analyzing the Mechanical Heterogeneity of the Chang'e-5 Lunar Breccia Clast: Implications for the Elastic Modulus of Lunar Rock","authors":"Jiayan Nie, Siqiao Wang, Yifei Cui, Zhijun Wu, Jian He, Guodong Wang, Xiaojia Zeng","doi":"10.1029/2024JE008849","DOIUrl":"https://doi.org/10.1029/2024JE008849","url":null,"abstract":"Understanding the mechanical properties (e.g., Young's modulus and hardness) of lunar regolith materials, especially their heterogeneity, is of great significance to planetary science. For the first time, we applied grid nanoindentation tests on the Chang'e-5 lunar breccia clast to analyze its mechanical heterogeneity along with a micromorphology analysis of representative indentation spots. A novel Bayesian deconvolution method was proposed to identify the dominating components and statistical characteristics of their mechanical properties, which were further employed to estimate the elastic properties of lunar rocks. Research has shown that lunar breccia clasts exhibit high mechanical heterogeneity due to their polymineral compositions, well-developed micro-pores, micro-cracks, and complex surface fabrics. Moreover, compared with the asteroid 25,143 Itokawa regolith particles, and the Chelyabinsk and NWA6013 meteorites, the Chang'e-5 lunar breccia clast, and the lunar DHOFAR 1084, JAH 838 and NWA 11444 meteorites have larger average plastic indices, indicating that the lunar regolith materials may be characterized by better cushion energy absorption and ductility properties than asteroids. In addition, two dominant components with similar hardness but different relative weights were identified for two representative measurement regions within the lunar breccia clast. On the basis of the deconvolved mechanical information, we finally estimated the elastic modulus range of lunar rocks (i.e., 38∼56 GPa) through effective medium theory. This study provides important implications for understanding the influence of planetary surface processes on the mechanical properties of extraterrestrial regolith materials and for predicting the engineering properties of lunar rocks from dimensionally limited lunar samples.","PeriodicalId":16101,"journal":{"name":"Journal of Geophysical Research: Planets","volume":"130 6","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144179369","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Neoproterozoic Snowball Earth Initiation From Silicate Weathering of a Large Igneous Province 大火成岩省硅酸盐风化作用下的新元古代雪球地球

IF 3.9 1区地球科学

Journal of Geophysical Research: Planets Pub Date : 2025-05-31 DOI: 10.1029/2024JE008701

Charlotte Minsky, Robin Wordsworth, Francis A. Macdonald, Andrew H. Knoll

{"title":"Neoproterozoic Snowball Earth Initiation From Silicate Weathering of a Large Igneous Province","authors":"Charlotte Minsky, Robin Wordsworth, Francis A. Macdonald, Andrew H. Knoll","doi":"10.1029/2024JE008701","DOIUrl":"https://doi.org/10.1029/2024JE008701","url":null,"abstract":"The causes of Snowball Earth events, rare global glaciations important for the evolution of life, are unknown. Recent geochronology of the Sturtian Snowball and Franklin Large Igneous Province (LIP) suggest that the Franklin caused the Sturtian via <math>\u0000 <semantics>\u0000 <mrow>\u0000 <msub>\u0000 <mtext>CO</mtext>\u0000 <mn>2</mn>\u0000 </msub>\u0000 </mrow>\u0000 <annotation> ${text{CO}}_{2}$</annotation>\u0000 </semantics></math> drawdown by silicate weathering. By modeling the climate response to LIP weathering, we show that this initiation mechanism is feasible given a cold background climate, rapid chemical weathering and erosion over a large area, and a weak sensitivity of the silicate weathering feedback strength. Our model indicates that similar Phanerozoic LIPs may have failed to trigger Snowballs due to hot background climates and lower erosion rates caused by lower topography or vegetation, while high <math>\u0000 <semantics>\u0000 <mrow>\u0000 <msub>\u0000 <mtext>CO</mtext>\u0000 <mn>2</mn>\u0000 </msub>\u0000 </mrow>\u0000 <annotation> ${text{CO}}_{2}$</annotation>\u0000 </semantics></math> suppressed LIP perturbations earlier in Earth history. We therefore argue that Snowball initiation by weathering of the Franklin is plausible and consistent with the lack of Snowballs in the Phanerozoic and mid-Proterozoic, given specific conditions that motivate future geologic observations.","PeriodicalId":16101,"journal":{"name":"Journal of Geophysical Research: Planets","volume":"130 6","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144185883","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermal Impacts of Atmospheric Gravity Waves in the Martian Thermosphere 火星热层中大气重力波的热影响

IF 3.9 1区地球科学

Journal of Geophysical Research: Planets Pub Date : 2025-05-28 DOI: 10.1029/2024JE008789

Scott L. England, Aishwarya Kumar, Guiping Liu, Mehdi Benna

{"title":"Thermal Impacts of Atmospheric Gravity Waves in the Martian Thermosphere","authors":"Scott L. England, Aishwarya Kumar, Guiping Liu, Mehdi Benna","doi":"10.1029/2024JE008789","DOIUrl":"https://doi.org/10.1029/2024JE008789","url":null,"abstract":"Observations of the Martian thermosphere have revealed small-scale, large amplitude fluctuations believed to be associated with atmospheric gravity waves (GWs). Previous analysis of the MAVEN Neutral Gas and Ion Mass Spectrometer (NGIMS) data has described the overall behavior of these waves and their consistency with GW theory. One of the key impacts of these waves as they dissipate is the heating and cooling of the neutral atmosphere, from both deposition of the energy and transporting heat. While initial evidence for this has been presented, systematic patterns in heating and cooling require the analysis of a long-term data set. This study examines 5 years of NGIMS data to systematically determine the thermal impact of GWs in the thermosphere, and variations with location, season and local time. While both viscous heating and cooling from sensible heat flux are significant at the altitudes seen with NGIMS, cooling tends to dominate in the cases examined. Clear variations in the heating and cooling are seen with the background atmospheric density, with a large degree of variability in addition to this, reflecting the high degree of variations in GWs seen in the thermosphere. Seasonal variations in the net thermal impact of GWs are apparent at mid-high latitudes, and less clear near the equator. During times when MAVEN's periapsis is deeper inside the atmosphere, clear increases in the net thermal impact of GWs with altitude are evident. The overall results are consistent with some prior simulations but include altitudes and conditions not reported in those studies.","PeriodicalId":16101,"journal":{"name":"Journal of Geophysical Research: Planets","volume":"130 6","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JE008789","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144148398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Early Partial Melting and Formation of Na-Rich Asteroidal Crust Revealed by the Albite-Rich Achondrite Erg Atouila 001 富钠长石无球粒陨石Erg Atouila 001揭示富钠小行星地壳的早期部分熔融和形成

IF 3.9 1区地球科学

Journal of Geophysical Research: Planets Pub Date : 2025-05-25 DOI: 10.1029/2024JE008856

Y. Wu, X. Che, L. Pan, P. Yan, Z. Xiao

{"title":"Early Partial Melting and Formation of Na-Rich Asteroidal Crust Revealed by the Albite-Rich Achondrite Erg Atouila 001","authors":"Y. Wu, X. Che, L. Pan, P. Yan, Z. Xiao","doi":"10.1029/2024JE008856","DOIUrl":"https://doi.org/10.1029/2024JE008856","url":null,"abstract":"Elucidating the extent of early magmatic diversity on asteroids is crucial for understanding the planetary formation processes. While our knowledge of early asteroidal differentiation is predominantly based on basaltic components due to the relatively large number of basaltic achondrites discovered, the recent identification of high-Si achondrites offers a new opportunity to investigate the origin and evolution of felsic magmas on asteroids. In this study, we conducted detailed petrological, mineralogical, and in situ phosphate chronological analyses on Erg Atouila (EA) 001, an ungrouped achondrite recognized for its high SiO2 and alkali contents. Our findings suggest that EA 001 could derive from low degree partial melting of an oxidized parent body, involving extensive segregation of Fe–Ni-S melts and potential degassing of volatiles. Impact heating may play an important role in the thermal evolution of its parent body. Geochemical modeling of rare earth element concentrations indicates that EA 001 could have originated from <15% fractional melting of chondritic precursors (e.g., Acapulco-like, Lewis Cliff 88763-like), with apatite playing a crucial role. Although the oxygen isotopic composition of EA 001 is similar to that of the acapulcoites-lodranites clan and some FeO-rich achondrites, other petrological and geochemical features suggest formation from different source materials. The diversity among high-Si achondrites implies that partial melts of feldspar-rich components are more common than previously thought on asteroids and are important constituents of crustal components. This process likely occurred on various asteroidal parent bodies with different initial compositions, oxidation conditions, degassing scenarios, and differentiation extents.","PeriodicalId":16101,"journal":{"name":"Journal of Geophysical Research: Planets","volume":"130 5","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144135638","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Age Estimation of Individual Lunar Simple Craters Using the Topography Degradation Model 利用地形退化模型估算单个月球简单陨石坑的年龄

IF 3.9 1区地球科学

Journal of Geophysical Research: Planets Pub Date : 2025-05-24 DOI: 10.1029/2025JE008937

Fanglu Luo, Zhiyong Xiao, Minggang Xie, Yichen Wang, Yizhen Ma

{"title":"Age Estimation of Individual Lunar Simple Craters Using the Topography Degradation Model","authors":"Fanglu Luo, Zhiyong Xiao, Minggang Xie, Yichen Wang, Yizhen Ma","doi":"10.1029/2025JE008937","DOIUrl":"https://doi.org/10.1029/2025JE008937","url":null,"abstract":"Crater statistics is the canonical method used to estimate model ages of planetary surfaces, frequently applied on ejecta facies of individual craters to estimate their formation ages. Model ages of simple craters are critical information in planetary geology, but the applicability of crater statistics for ejecta deposits of simple craters is usually hindered by small counting areas and/or limited number of usable craters, also hampered by unconstrained effects of heterogeneous target properties and various forms of background secondaries. This difficulty is especially pronounced for relatively old and small simple craters. On the other hand, topographic degradation of simple craters on the Moon can be modeled using the diffusive equation. Assuming an ideal original topographic profile for pristine simple craters, topographic degradation states of simple craters were used to estimate their formation ages, but earlier endeavors were not calibrated and the effect of large topographic variations of pristine simple craters lacks constraint. Here, we developed this method by updating topographic profiles for pristine lunar simple craters. Variations of initial topographic profiles are considered in the model construction, yielding an uncertainty of less than ∼165 Ma for the derived model ages of craters larger than 400 m. The first-order reliability of this method is verified by applying it to craters with isotopic ages constrained by lunar samples, and the derived degradation ages are also broadly consistent with model ages derived from crater statistics. However, this method is less suitable for craters smaller than 400 m due to their much larger initial topographic variations.","PeriodicalId":16101,"journal":{"name":"Journal of Geophysical Research: Planets","volume":"130 5","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144126005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mare Basalt Thickness in the Chang'E-6 Landing Region: Insights Into Late-Stage Volcanism in the Lunar Farside South Pole–Aitken Basin 嫦娥六号着陆区海玄武岩厚度：对月球背面南极-艾特肯盆地晚期火山活动的认识

IF 3.9 1区地球科学

Journal of Geophysical Research: Planets Pub Date : 2025-05-23 DOI: 10.1029/2024JE008835

Ziyi Jia, Haijun Cao, Xuejin Lu, Le Qiao, Zongcheng Ling

{"title":"Mare Basalt Thickness in the Chang'E-6 Landing Region: Insights Into Late-Stage Volcanism in the Lunar Farside South Pole–Aitken Basin","authors":"Ziyi Jia, Haijun Cao, Xuejin Lu, Le Qiao, Zongcheng Ling","doi":"10.1029/2024JE008835","DOIUrl":"https://doi.org/10.1029/2024JE008835","url":null,"abstract":"Chang'E-6 probe collected lunar samples from a young mare plain in the southern Apollo basin within the South Pole–Aitken (SPA) basin on the lunar farside. By synthesizing morphological, compositional, and spectral data, we analyzed the excavation depths of craters that penetrated different basalt layers to evaluate the stratigraphy and total thickness of the mare deposits using multiple remote sensing data sets (Kaguya Multiband Imager). Results reveal that the upper Eratosthenian-aged basalt layer, approximately 79 m thick, is relatively thick in the west and gradually thins toward the east but thickens again, while the lower Imbrian-aged mare layer, around 44 m thick, exhibits an overall thinning trend from northwest to southeast. This thickness variation of the Eratosthenian-aged basalt unit is likely influenced by the formation of the nearby wrinkle ridge (∼3.2 Ga), which resulted from the cooling and contraction of the Imbrian-aged basalt unit. The ridge may have acted as a barrier, obstructing the westward flow of moderate-Ti lava that later formed the Eratosthenian-aged basalts. Both Chang'E-5 and Chang'E-6 landing regions show similarities in basalt composition and thickness; however, the Chang'E-6 zone experienced significantly smaller eruption volumes. The similar eruptive volumes between Imbrian- and Eratosthenian-aged basalts at the Chang'E-6 landing region suggest that late-stage mare volcanism in the SPA basin was likely controlled by a thin crust facilitating magma ascent and dike propagation rather than a gradual increase in eruption volume over time.","PeriodicalId":16101,"journal":{"name":"Journal of Geophysical Research: Planets","volume":"130 5","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144117987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0