Journal of Geophysical Research: Planets最新文献

{"title":"Signatures of Io Plasma Torus-Induced Ultra Low Frequency Waves in Jupiter’s Polar Magnetosphere","authors":"Xiaoyi Tan,&nbsp;Fei He,&nbsp;Jianzhao Wang,&nbsp;Yi-Jia Zhou,&nbsp;Zhaojin Rong,&nbsp;Yong Wei","doi":"10.1029/2025JE009534","DOIUrl":"https://doi.org/10.1029/2025JE009534","url":null,"abstract":"<p>Understanding how the Io plasma torus (IPT) modulates Jupiter's magnetospheric dynamics is a fundamental unanswered question in planetary space physics. In this study, we use magnetic field line mapping to project Juno's trajectories onto a centrifugal symmetry surface and identify possible torus crossings. By removing the background magnetic field and statistically analyzing the fluctuations, periodic magnetic perturbations inside the outer torus region were detected. Our results show that: (a) These waves are spatially localized Ultra Low Frequency waves, (b) the intensity of the waves appears to be spatially correlated with IPT emissions, and (c) there is significant north–south asymmetry of power spectral density. We conclude that the local plasma density variation in IPT controls the amplitude and energy of waves. The observed hemispheric asymmetry is possibly due to different particle precipitation efficiencies between the northern and southern hemispheres. It may also be affected by different magnetic field intensities. Our results suggest that the IPT not only supplies plasma to Jupiter's magnetosphere but also serves as an important source of magnetospheric disturbances. This implies that IPT may be playing an essential role in Jovian magnetospheric dynamics and may hint at an intricate energy coupling process among different layers of the Jupiter system.</p>","PeriodicalId":16101,"journal":{"name":"Journal of Geophysical Research: Planets","volume":"131 10","pages":""},"PeriodicalIF":3.7,"publicationDate":"2026-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149146091","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}

{"title":"Mapping the Western Jezero Crater Rim From Orbit: Connections to Regional Geologic Units and Context for Exploration by the Mars 2020 Perseverance Rover","authors":"M. C. Deahn,&nbsp;B. Horgan,&nbsp;F. Calef III,&nbsp;J. Schroeder,&nbsp;K. M. Stack,&nbsp;N. R. Williams,&nbsp;S. Alwmark,&nbsp;C. C. Bedford,&nbsp;J. Bell,&nbsp;M. Bramble,&nbsp;E. Cloutis,&nbsp;L. Crumpler,&nbsp;T. Del Sesto,&nbsp;D. T. Flannery,&nbsp;B. Garczynski,&nbsp;E. Graser,&nbsp;S. Gwizd,&nbsp;L. Ives,&nbsp;L. Kah,&nbsp;A. Klidaras,&nbsp;C. Lesh,&nbsp;H. T. Manelski,&nbsp;L. E. Mayhew,&nbsp;C. Miller,&nbsp;M. Nachon,&nbsp;C. Quantin-Nataf,&nbsp;N. Randazzo,&nbsp;E. Ravanis,&nbsp;P. Russell,&nbsp;J. I. Simon,&nbsp;J. R. C. Voigt","doi":"10.1029/2025JE009471","DOIUrl":"https://doi.org/10.1029/2025JE009471","url":null,"abstract":"<p>The <i>Mars 2020</i> rover is currently traversing the western rim of Jezero, a Middle to Late Noachian-aged crater formed by an impactor that struck the northwest edge of Isidis Planitia (hereafter referred to as the Isidis basin) on Mars. Previous studies suggest that pre-Isidis basin and Noachian outcrops are preserved throughout this region; however, the nature of these exposures in the Jezero crater rim is unclear. It has been hypothesized that crater-forming processes should expose these ancient crustal rocks in the Jezero crater rim—presenting a unique opportunity to explore ancient Mars outcrops that are otherwise typically buried by younger units. Jezero's rim has undergone extensive erosion and modification since its formation ∼3.9 billion years ago. To investigate these ancient lithologies, the <i>Mars 2020</i> Science Team produced a 1:2500 scale geologic map and interpreted a bedrock map of the ∼14.5 × 3.5 km area around the western Jezero crater rim. We identified, mapped, and defined nine bedrock units on Jezero crater's rim to make connections to regional geologic units and identify deposits or features unique to Jezero crater. We found that the rim likely preserves a record of pre-Isidis bedrock, the Isidis and Jezero impacts, and post-impact geologic processes. We also observed candidate megabreccia, hydrothermal ridges, and regional volcanics that may be targets for future rover-based investigations. Our results show that in situ investigation of pre-Isidis and Noachian-aged lithologies preserved on the rim will provide insight into the nature of Mars' early crustal formation and cratering processes.</p>","PeriodicalId":16101,"journal":{"name":"Journal of Geophysical Research: Planets","volume":"131 10","pages":""},"PeriodicalIF":3.7,"publicationDate":"2026-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2025JE009471","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149146092","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}

{"title":"Elastic Properties of Titan Tholins Revealed by Brillouin Spectroscopy","authors":"Mark A. Johnson,&nbsp;Jose R. Montes-Bojorquez,&nbsp;Adis Husić,&nbsp;Xinting Yu,&nbsp;Wenhao Su,&nbsp;Jia-Sen Hu,&nbsp;Ryan Blase,&nbsp;Edward Patrick,&nbsp;Alan Whittington,&nbsp;Jin S. Zhang","doi":"10.1029/2026JE009914","DOIUrl":"https://doi.org/10.1029/2026JE009914","url":null,"abstract":"<p>Titan tholins, complex organic solids synthesized by simulating photochemical processes in Titan's atmosphere, are widely regarded as analogs to organic surface materials on the Saturnian moon. Their mechanical properties are critical for understanding the evolution of Titan's geomorphology and crustal layering. Here, we report the first direct experimental determination of the complete set of aggregate elastic moduli of tholins using Brillouin spectroscopy. Measurements conducted on tholin powder samples yielded a bulk modulus of 11 (2) GPa and a shear modulus of 3.9 (5) GPa, from which we derive a Young's modulus of 11 (1) GPa and a Poisson's ratio of 0.34 (3). Thin-film samples synthesized under slightly different conditions yield similar results. Compared with other Titan-relevant organic compounds, tholins exhibit the highest elastic stiffness measured to date, exceeding even H₂O ice in both bulk and shear moduli. These results support the interpretation that complex organics contribute significantly to the mechanical stability and transport behavior of Titan's equatorial dune sediments. Measurements following prolonged atmospheric exposure reveal persistent stiffening of tholins that remains after vacuum treatment, likely associated with minor chemical modification and physical reorganization, highlighting the importance of controlled sample handling for future laboratory investigations. This study also demonstrates the effectiveness of Brillouin spectroscopy as a non-destructive technique for characterizing planetary organic materials and provides new constraints relevant to future seismic and geophysical investigations by the Dragonfly mission.</p>","PeriodicalId":16101,"journal":{"name":"Journal of Geophysical Research: Planets","volume":"131 10","pages":""},"PeriodicalIF":3.7,"publicationDate":"2026-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2026JE009914","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149146093","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}

{"title":"Experimental Constraints on Low Temperature Fe-Mg Carbonate Precipitation Under Early Mars Conditions","authors":"M. M. Morris,&nbsp;J. A. Hurowitz,&nbsp;L. Ehm","doi":"10.1029/2026JE010007","DOIUrl":"https://doi.org/10.1029/2026JE010007","url":null,"abstract":"<p>Fe-Mg carbonates on Mars preserve key evidence of past aqueous chemistry and climate, yet their formation conditions remain poorly constrained. We conducted low-temperature (∼25°C) anoxic precipitation experiments under Mars-like conditions, systematically varying pH, Fe:Mg ratio, Ca²⁺ content, and carbonate saturation state. Results show initial pH and saturation state as primary controls: near-neutral pH favored siderite (FeCO₃) and chukanovite (Fe₂(CO₃)(OH)₂) precipitation, while alkaline conditions promoted the precipitation of hydrated Mg-carbonate and Fe-substituted Mg-hydroxide and layered double hydroxides. Ca²⁺ suppressed amorphous Fe-carbonate precursor precipitation, enhancing the growth of rhombohedral carbonate and enabling partial Ca²⁺ substitution. A limited number of elevated temperature experiments (50°C) did not enhance Mg²⁺ substitution in siderite, but instead resulted in the precipitation of very high-magnesium calcite (MgCa(CO₃)₂) overgrowths. Mg²⁺ incorporation into siderite (at the level of ∼10 mol%) occurred only under low Fe:Mg ratios and high magnesite (MgCO₃) saturation, highlighting kinetic barriers to Mg²⁺ substitution.</p>","PeriodicalId":16101,"journal":{"name":"Journal of Geophysical Research: Planets","volume":"131 10","pages":""},"PeriodicalIF":3.7,"publicationDate":"2026-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149145927","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}

{"title":"Modeling the Redistribution of Dust Across the Martian Surface for Mars Years 24 to 36","authors":"Demetrius Ramette,&nbsp;Lena Noack,&nbsp;Sebastian Walter,&nbsp;Kerstin Schepanski","doi":"10.1029/2025JE009517","DOIUrl":"https://doi.org/10.1029/2025JE009517","url":null,"abstract":"<p>Global Dust Events (GDEs) transport huge amounts of dust across the Martian atmosphere. GDEs occur only every few Mars Years (MYs), but the reasons behind this inter-annual variability remain poorly understood. The question whether surface dust exhaustion and subsequent replenishment explain this variability remains open. How is dust being seasonally and annually redistributed across the Martian surface? Are global and regional scale dust reservoirs being depleted and replenished? We use the Planetary Climate Model where the injection of dust from the surface into the atmosphere is driven by observation-based daily maps of the Column Dust Optical Depth. The transport and deposition of dust are free-running, that is, follow the modeled general circulation. This allows us to quantify the net removal or accumulation of dust across the Martian surface for MYs 24 to 36. We find that dust is mainly redistributed from the mid-latitudes of both hemispheres to the tropical and polar regions. We further find that this pattern is persistent across all MYs, even in years with GDEs. This indicates that global and regional scale depletion/replenishment cycles of surface dust reservoirs rather do not explain the inter-annual variability of GDEs. We further show that shifting the GDE onset timing would yield similar redistribution of dust from the mid-latitudes to the tropical and polar regions, meaning the persistence of the aforementioned redistribution patterns might be robust under the current Martian climate. These findings lead to a more constrained understanding of the inter-annual variability of GDEs and the Martian climate.</p>","PeriodicalId":16101,"journal":{"name":"Journal of Geophysical Research: Planets","volume":"131 10","pages":""},"PeriodicalIF":3.7,"publicationDate":"2026-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2025JE009517","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149145928","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}

{"title":"Ancient Impact Melt Near the Lunar South Pole: Distribution, Provenance, and Sampling Strategy","authors":"J. K. Ando,&nbsp;A. J. Blance,&nbsp;É. Brassard,&nbsp;A. Gmerek,&nbsp;R. Platt,&nbsp;L. Galien,&nbsp;Z. A. Guess,&nbsp;A. V. Jasko,&nbsp;M. Simopolou,&nbsp;K. Tunnell,&nbsp;D. A. Kring","doi":"10.1029/2026JE009990","DOIUrl":"https://doi.org/10.1029/2026JE009990","url":null,"abstract":"<p>Due to a lack of pre-Nectarian samples associated with specific impacts in the Apollo suite, the early Solar System's impact chronology is poorly constrained. We investigate where Artemis and other south polar lunar missions could sample impactites to determine the ages of pre-Nectarian craters, focusing on the ancient craters Haworth, Shoemaker, and Faustini. We examine similarly sized non-polar analogue craters containing mappable impact melt features and find no patterns that could be used to predict where similar deposits may have once existed in the south polar region. We also create a model of the ejecta stratigraphy of craters that post-date the South Pole-Aitken basin, from which we predict how younger, smaller craters may excavate ancient, buried impact melt to the surface. We find that, at most, primary impact melt from a source crater will comprise no more than 2%–3% of material at the surface above its buried rim, and &lt;1% elsewhere. Furthermore, disruption of the ejecta stratigraphy by ballistic sedimentation and surface mixing due to impact gardening will make sampling specific sources more difficult. We conclude that determining the provenance of ancient impact melt samples will be difficult, but that sampling near the rim of a given source—such as in the “Haworth” Artemis candidate landing region—will maximize the chances of success.</p>","PeriodicalId":16101,"journal":{"name":"Journal of Geophysical Research: Planets","volume":"131 10","pages":""},"PeriodicalIF":3.7,"publicationDate":"2026-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2026JE009990","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149146012","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}

{"title":"Ground Penetrating Radar Observations of Subsurface Structures From the Makgadikgadi Pans (Botswana): A Terrestrial Analogue of Martian Playa Lakes","authors":"M. Shawel,&nbsp;L. Capozzoli,&nbsp;T. H. Kahsay,&nbsp;B. Kgosidintsi,&nbsp;G. Romano,&nbsp;A. T. Selepeng,&nbsp;F. Franchi","doi":"10.1029/2026JE009817","DOIUrl":"https://doi.org/10.1029/2026JE009817","url":null,"abstract":"<p>Playa lakes are considered promising landing sites on Mars because of their strong astrobiological potential. Therefore, sediments and buried structures in terrestrial playa lakes have become the focus of numerous analogue studies. The inclusion of ground penetrating radar (GPR) in the payloads of Martian missions has opened new avenues for subsurface investigations enabling comparisons between buried structures on Earth and Mars. This study presents nine first-of-their-kind radargrams, imaging to depths of ca. 15 m, from the Makgadikgadi Pans (Botswana), a playa lake analogue for Mars basins. The GPR surveys targeted buried faults, relict fan deltas, and layered mounds. Despite challenges posed by shallow brines and the water table, GPR successfully imaged internal geometries within the mound, supporting possible genetic models linked to groundwater upwelling. The radargrams also confirmed brine upwelling along buried faults and deltaic geometries previously identified only through satellite imagery. These findings provide important terrestrial analogs for interpreting the Mars subsurface and refining our understanding of its hydrological evolution.</p>","PeriodicalId":16101,"journal":{"name":"Journal of Geophysical Research: Planets","volume":"131 10","pages":""},"PeriodicalIF":3.7,"publicationDate":"2026-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2026JE009817","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149145796","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}

{"title":"Plasma Properties at the Orbits of Ganymede and Callisto: Survey of Juno Data","authors":"Reign Pagaran,&nbsp;F. Bagenal,&nbsp;J.-Z. Wang,&nbsp;R. J. Wilson,&nbsp;R. W. Ebert","doi":"10.1029/2026JE009872","DOIUrl":"https://doi.org/10.1029/2026JE009872","url":null,"abstract":"<p>The space environment around the Galilean moons is important for understanding the interaction of the magnetospheric plasma with their magnetosphere (in the singular case of Ganymede), their atmospheres and surfaces. Juno's orbital evolution brought the spacecraft close to the orbits of Ganymede and Callisto on multiple occasions over several years. We present a survey of plasma conditions (density, temperature, composition, flows, and magnetic field) near the orbits of these moons to illustrate the variability of these plasma properties. Statistics of their median and percentile values quantify the ranges of parameters experienced by the moons.</p>","PeriodicalId":16101,"journal":{"name":"Journal of Geophysical Research: Planets","volume":"131 10","pages":""},"PeriodicalIF":3.7,"publicationDate":"2026-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2026JE009872","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149145566","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}

{"title":"Lunar Mineralogical Evidence Provided by Chang'e-5 Lunar Soil Microscopic Images and Raman Spectroscopy","authors":"Fanli Lin,&nbsp;Jiansheng Wang,&nbsp;Huaiyuan Wang,&nbsp;Kaijie Dai,&nbsp;Kun Ding,&nbsp;Zhiping He,&nbsp;Qingli Li","doi":"10.1029/2026JE009952","DOIUrl":"https://doi.org/10.1029/2026JE009952","url":null,"abstract":"<p>The Chang'e-5 lunar regolith samples are returned samples of young mare basalt, possessing significant scientific research value. This paper performs nondestructive analysis on one of the Chang'e-5 basalt samples using scanning electron microscopy and micro-Raman spectroscopy. Through the analysis of the mineralogical characteristics, modal abundance, and impact effects of the sample, it is found that the sample is relatively consistent in composition with most Chang'e-5 lunar regolith samples, being low-titanium mare basalt that has undergone a certain degree of impact events. The analysis of quartz and plagioclase indicates that the impact pressure experienced by the young mare basalt is limited to a maximum of 20–25 GPa, with a minimum impact pressure of at least 5.2 GPa. Additionally, both this sample and the Chang'e-5 lunar regolith samples should likely originate from a low-titanium magma source, which may possibly have formed through the partial melting of a mixed magma composed of early refractory cumulates and late ilmenite-bearing cumulates, followed by fractional crystallization in a shallow magma reservoir before being erupted onto the lunar surface, and is compositionally distinct from Apollo and CE-6 basalts as an evolved, low-Ti late-stage basalts. This research can provide mineralogical evidence for understanding the thermal evolution of the Moon, particularly the late-stage volcanic activity and internal thermodynamic changes.</p>","PeriodicalId":16101,"journal":{"name":"Journal of Geophysical Research: Planets","volume":"131 10","pages":""},"PeriodicalIF":3.7,"publicationDate":"2026-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149145797","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}

{"title":"A Reassessment of the Lithium Isotope Composition of the Moon Using Mare Basalt, Mg-Suite and Anorthosite Meteorites","authors":"Heng-Ci Tian,&nbsp;Wei Yang,&nbsp;Huijuan Zhang,&nbsp;Jingyan Cai,&nbsp;Yangting Lin,&nbsp;Keqing Zong,&nbsp;Qi Liu,&nbsp;Feixiang Liu,&nbsp;Caihong Gao,&nbsp;Maoyong He","doi":"10.1029/2026JE010077","DOIUrl":"https://doi.org/10.1029/2026JE010077","url":null,"abstract":"<p>To further constrain the lunar Li isotopic composition and its behavior during lunar magmatic differentiation, we measured twelve lunar meteorites, including mare basalts, Mg-suite rocks and anorthosites. Petrographic observation, dilute acid cleaning, and trace elemental characteristics indicate minimal terrestrial contamination. Low-Ti basalt meteorites yield a restricted δ⁷Li range (2.75 ± 0.52‰ to 3.95 ± 0.16‰), consistent with Apollo low-Ti basalts (3.1∼5.6‰). The Mg-rich norite Arguin 002 shows a similar value, supporting limited Li isotope fractionation during early lunar magma ocean (LMO) differentiation, a conclusion corroborated by modeling results of Li isotopic evolution during LMO differentiation. The heavier δ⁷Li in high-Ti basalts, however, points to the presence of interaction between ilmenite-bearing cumulate-derived melts and the ambient mantle rather than to simple late-stage LMO differentiation. Combining the reported Apollo and La Paz mare basalt meteorites data, we estimate the lunar mantle δ⁷Li to be 3.8 ± 1.3‰, indistinguishable from the Earth's mantle, implying negligible fractionation during the Giant Impact. In contrast, lunar anorthosites exhibit extreme δ⁷Li variations (−0.7‰ to 9.8‰) with a negative correlation with Li content, likely reflecting impact-driven secondary redistribution. These findings not only confirm the Earth-Moon Li isotopic similarity using meteorites from diverse lunar terrains that complement the Apollo collection but also reveal that the lunar crust has been pervasively modified by impact processes, which have significantly disturbed its primary Li isotopic compositions.</p>","PeriodicalId":16101,"journal":{"name":"Journal of Geophysical Research: Planets","volume":"131 10","pages":""},"PeriodicalIF":3.7,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149145492","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}