Geology of Ore Deposits最新文献

{"title":"Cacoxenite—a Complex Phosphate with a Modular Structure","authors":"M. S. Avdontceva, S. V. Krivovichev, M. G. Krzhizhanovskaya, V. N. Bocharov, N. S. Vlasenko, D. V. Spiridonova","doi":"10.1134/s1075701523070024","DOIUrl":"https://doi.org/10.1134/s1075701523070024","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The crystal chemical peculiarities of cacoxenite from the Těškov quarry (Bohemia, Czech Republic) are studied using single crystal X-ray analysis and thermal X-ray analysis, electron-microprobe analysis, and infrared (IR) and Raman spectroscopy. The crystal structure of cacoxenite (hexagonal system, sp. gr. <i>P</i>6₃/<i>m</i>, <i>a</i> = 27.5677(4) Å, <i>c</i> = 10.5364(3) Å, <i>V</i> = 6934.64(16) ų) is refined to <i>R</i>₁ = 0.052 by 4637 independent reflections. The crystal structure is based on two independent structural blocks, which form an open-framework (the minimum free pore diameter is 15.1 Å). The crystal structure of cacoxenite is stable up to 190°C. The empirical formula of the mineral (based on 17 P atoms) is (<span>({text{Fe}}_{{19.98}}^{{3 + }})</span>Al_4.97)_Σ24.95O₆(PO₄)₁₇(OH_8.52Cl_3.48)_Σ12(H₂O)₂₄⋅ <i>n</i>H₂O (<i>n</i> ∼ 50). The most intense bands of IR and Raman spectra in a range from 400 to 1200 cm^–1 correspond to stretching and bending vibration modes of the phosphate groups. The presence of water in the structure is confirmed by the presence of an intense band in the IR spectrum in the area of 1624 cm^–1 (O–H vibrations), as well as the absorption band with maximum of 3357 cm^–1, which corresponds to stretching vibrations of the Fe(Al)–OH bond and H₂O molecules. The calculation of structural complexity of cacoxenite for the framework without H-corrections and with the addition of framework-related H-positions shows a very complex structure of the mineral (2312.464 bit/cell).</p>","PeriodicalId":12719,"journal":{"name":"Geology of Ore Deposits","volume":"100 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139763053","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":"Texture and Structure Features of Yakutites from Placers of the Anabar Diamondiferous Region","authors":"S. S. Ugap’eva, A. E. Molotkov, S. A. Gromilov, V. P. Afanasiev, A. D. Pavlushin, A. P. Eliseev, V. I. Popov","doi":"10.1134/s1075701523070127","DOIUrl":"https://doi.org/10.1134/s1075701523070127","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>This paper reports new study data on structural features of polycrystalline diamonds (yakutites) from placers of the Anabar diamondiferous region obtained by X-ray and optical spectroscopy. All studied samples are fine-grained (up to 1 μm) polycrystals. The diffractograms of most samples show reflexes related to lonsdaleite defects in the diamond structure. Yakutites are inhomogeneous: diffractograms of different parts of diamond aggregates show different reflections of texture and micrograins with a monocrystalline structure. A “bell” in the single-phonon region of IR spectra indicates defects in the crystal structure of yakutites and a significant structural stress. An aggregated nitrogen line is absent in the photoluminescence spectra of yakutites, likely due to the fact that they were ejected outside the crater after the solid-phase synthesis stage and were relatively rapidly cooled down.</p>","PeriodicalId":12719,"journal":{"name":"Geology of Ore Deposits","volume":"77 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139755674","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":"Oriented Microinclusions of Al–Fe–Mg–Ti Oxides in Quartz from Metapelitic Granulites of the Bunger Hills, East Antarctica","authors":"Yu. L. Gulbin, I. A. Abdrakhmanov, I. M. Gembitskaya, E. A. Vasiliev","doi":"10.1134/s1075701523070048","DOIUrl":"https://doi.org/10.1134/s1075701523070048","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The Bunger Hills, East Antarctica occupies an area of about 300 km² and is underlain by large Neoarchean tonalite–granite orthogneiss bodies in the southern part and a Paleoproterozoic volcanosedimentary sequence, buckled into isoclinal folds and metamorphosed to the granulite facies, in the northern. The sequence is intruded by large syncollisional charnockite plutons and consists predominantly of strongly migmatized garnet–sillimanite–cordierite paragneisses (metapelitic granulites). A characteristic feature of the mineral composition of these rocks is the paragenesis of Zn-poor spinel and quartz. The <i>P–T</i> conditions for the equilibrium of these two minerals are 6–7 kbar and 970–1030°C as estimated with the method of isochemical phase diagrams and 985–1005°C, as calculated with the aid of Ti-in-quartz thermobarometry (Huang and Audétat, 2012). Quartz contains needle-shaped microinclusions less than 1 μm in thickness aligned along the [0001] direction and evenly distributed throughout the quartz grains. According to data of electron-probe analysis, they are heterogeneous and consist of rutile and spinel (hercynite) intergrowths. The available data suggest that the genesis of the microinclusions is related to the exsolution process and the diffusion of structural impurities in quartz (Al, Fe, and Ti) in the direction of parallel translation-slip zones (10<span>(bar {1})</span>10), along which the high-temperature plastic deformations of quartz took place during the postpeak stage. The appearance of spinel in the microparagenesis of the oxides of the Al–Fe–Mg–Ti system is interpreted as a result of the processes synchronous with the intracrystal diffusion: the open-system diffusion of Mg atoms along the weakness zones of the quartz lattice or the infiltration of Mg-rich fluids along the microscopic cleavage planes formed as a result of hydrofracturing.</p>","PeriodicalId":12719,"journal":{"name":"Geology of Ore Deposits","volume":"7 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139755664","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":"Diversity of the Structure of Diamond Crystals and Aggregates: Electron Backscatter Diffraction Data","authors":"E. A. Vasilev, A. A. Kudriavtsev, I. V. Klepikov, A. V. Antonov","doi":"10.1134/s1075701523070140","DOIUrl":"https://doi.org/10.1134/s1075701523070140","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Diamond crystals of various morphological types, including carbonado, were studied by the electron backscatter diffraction method. Cases of inhomogeneities of different natures were revealed: interpenetrant and mechanical twins, incoherent intergrowth, and splitting growth. Differences in the distribution pattern of boundary angles for different types of inhomogeneities have been shown: predominantly discrete in intergrowths, continuous distribution of low-angle boundaries in ballas diamonds, and continuous random distribution in carbonado. It has been shown that Rose channels in diamond arise as a result of etching at the intersection of mechanical twins. The revealed mechanical twins have a thickness of 60–600 nm.</p>","PeriodicalId":12719,"journal":{"name":"Geology of Ore Deposits","volume":"37 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139763060","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":"Thermodynamics of Arsenates, Selenites, and Sulfates in the Oxidation Zone of Sulfide Ores. XV. Synthetic Analog of Alfredopetrovite: Composition, Properties, and Stability Limits","authors":"K. L. Ushakova, M. V. Charykova, V. G. Krivovichev, N. M. Efimenko, N. V. Platonova, V. N. Bocharov, A. S. Mazur","doi":"10.1134/s1075701523070139","DOIUrl":"https://doi.org/10.1134/s1075701523070139","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The purpose of this work was to synthesize hexahydrate aluminum selenite Al₂(SeO₃)₃⋅6H₂O (analogous to the mineral alfredopetrovite) and study its solubility in water. Al₂(SeO₃)₃⋅6H₂O is synthesized from AlCl₃ and Na₂SeO₃ solutions at room temperature and atmospheric pressure. The obtained samples were studied using powder diffractometry, infrared and Raman spectroscopy, energy-dispersive X-ray microanalysis, nuclear magnetic resonance spectroscopy, and complex thermal analysis. Solubility was determined by isothermal saturation in ampoules at 25°C. Solubility products were calculated using Geochemist’s Workbench software package (GMB 9.0, SpecE8 program). As a result of the calculation, the average value logKsp[Al₂(SeO₃)₃⋅6H₂O] = –28.3 ± 0.5 was obtained. An Eh–pH diagram is constructed for the Al–Se–H₂O system, which was used to analyze the stability of alfredopetrovite in near-surface conditions.</p>","PeriodicalId":12719,"journal":{"name":"Geology of Ore Deposits","volume":"14 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139755662","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":"Crystal-Chemical Features of a Cation-Ordered Potassium Analog of Aqualite from the Kovdor Massif (Kola Peninsula)","authors":"R. K. Rastsvetaeva, N. V. Chukanov, I. V. Pekov, M. F. Vigasina","doi":"10.1134/s1075701523070085","DOIUrl":"https://doi.org/10.1134/s1075701523070085","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The chemical composition, crystal structure, and characteristics of the Raman spectrum of a highly hydrated aqualite-like mineral of the eudialyte group from the Kovdor massif (Kola Peninsula, Russia), in which potassium and hydronium group H₃O⁺ are the species-defining extraframework cations, are studied. The simplified formula of the mineral is (H₃O)₈Na₅K₂Zr₃Ca₆[Si₂₄O₆₉(OH)₃][Si₂]Mn(OH)₂Cl·2H₂O. It is characterized by space group <i>R</i>3 and unit-cell parameters <i>a</i> = 14.184(1), <i>c</i> = 30.797(1) Å, <i>V</i> = 5366.27(1) ų. A specific feature of this mineral, which distinguishes it from all other representatives of the eudialyte group, is a high degree of order in the distribution of large extraframework cations (Na⁺, K⁺, Sr²⁺, Ba²⁺, Ln³⁺, and H₃O⁺) over split sites of the crystal structure. In the studied mineral, some oxonium ions form complexes with water molecules with extremely strong hydrogen bonds similar to those that are realized in proton hydrate complexes such as Zundel and Eigen cations.</p>","PeriodicalId":12719,"journal":{"name":"Geology of Ore Deposits","volume":"4 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139755665","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":"Trace-Element Composition of Titanium Phases of Leucoxene–Quartz Ores from the Yarega Oil–Titanium Deposit, South Timan","authors":"S. G. Skublov, A. O. Krasotkina, A. B. Makeyev, O. L. Galankina","doi":"10.1134/s1075701523070097","DOIUrl":"https://doi.org/10.1134/s1075701523070097","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The distribution of trace elements (secondary ion mass spectrometry method) in rutile from the Yarega oil–titanium deposit was studied for the first time. A significant difference in the composition in the series leucoxene–rutile leucoxene (rutile with microscopic quartz inclusions)–rutile (recrystallized crystals) was established. Leucoxene is characterized by increased contents of the following elements (average values): Al (20 650 ppm), Fe (4833 ppm), Nb (2229 ppm), Zr (1273 ppm), Cr (436 ppm), V (1191 ppm), Sn (230 ppm), W (130 ppm), and Th (125 ppm). As leucoxene is converted to rutile leucoxene, represented by rutile with numerous quartz inclusions, a decrease in the contents of almost all trace elements, with the exception of V, was recorded. The Fe content decreases to 1892 ppm, that of Al to 1468 ppm, of Nb to 605 ppm, of Zr to 409 ppm, of Sn to 46 ppm, and of Cr to 181 ppm. A separate group is represented by rutile grains, in which one can observe a combination of rutile with numerous inclusions of quartz and “pure” rutile (recrystallized rutile with inclusions). The main trend in the change in the composition of rutile is a significant decrease in contents of a number of trace elements, compared with leucoxene and rutile leucoxene: the average V content is 71 ppm in rutile, 2.5 ppm in Sn, 144 ppm in Zr, 2.4 ppm in Hf, 52 ppm in Cr, and 677 ppm in Fe. There is also a decrease in Sb, Th, and U contents to about 1 ppm. There is a tendency toward accumulation of Nb when comparing rutile leucoxene and “pure” rutile. One can assume that the purification of rutile from admixtures as rutile leucoxene is transformed into sites of “pure” rutile (anatase?), up to the formation of single idiomorphic rutile crystals is a consequence of the hydrothermal process previously recorded in the geochemical characteristics of zircons from the Yarega deposit.</p>","PeriodicalId":12719,"journal":{"name":"Geology of Ore Deposits","volume":"200 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139755676","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":"Garmite, CsLiMg2(Si4O10)F2, a New Mica-Group Mineral from “Quartz Blocks” of the Darai-Pioz Alkaline Massif, Tajikistan","authors":"L. A. Pautov, A. A. Agakhanov, I. V. Pekov, V. Yu. Karpenko, O. I. Siidra, E. V. Sokolova, F. C. Hawthorne, A. R. Fayziev","doi":"10.1134/s1075701523070073","DOIUrl":"https://doi.org/10.1134/s1075701523070073","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A new trioctahedral mica garmite, CsLiMg₂(Si₄O₁₀)F₂, a Cs analogue of tainiolite, was found in an substantially quartz rock in the Darai-Pioz alkaline massif, Rasht district (formerly Garm district), Central Tajikistan, and was named after the town Garm, an administrative center of the Rasht district. It is closely associated with Mn-bearing pectolite, aegirine, Sr-rich fluorite, quartz, datolite, and polylithionite. Garmite forms lamellae up to 0.2 mm across and up to 0.02 mm thick. The mineral is transparent, colorless, with perfect, mica-like cleavage on (001). The Moh’s hardness is 2.5; micro-indentation hardness VHN₂₀ = 90 kg/mm². <i>D</i>_meas = 3.34(2) and <i>D</i>_calc = 3.336 g/cm³. Garmite is optically biaxial (–), 2<i>V</i>_meas = –10(5)°, α = 1.582(2), β = 1.601(2), γ = 1.602(2). The chemical composition (electron microprobe, Li and H by SIMS, wt %): SiO₂ 47.39, Al₂O₃ 0.71, TiO₂ 0.71, Nb₂O₅ 0.12, FeO 2.12, MnO 0.85, MgO 9.01, ZnO 2.23, K₂O 0.16, Cs₂O 26.98, Li₂O 3.57, H₂O 0.08, F 7.23, –O=F₂ 3.04, total 99.90. The empirical formula calculated on the basis of 12 (O + F) apfu is (Cs_0.95K_0.02)_Σ0.97Li_1.21(Mg_1.37Zn_0.16Fe_0.15Al_0.07Mn_0.06Ti_0.04)_Σ1.85Si_3.99O_10.04(F_1.92OH_0.04)_Σ1.96. Garmite is monoclinic, space group <i>C</i>2/<i>m</i>, <i>C</i>2 or C<i>m</i>; polytype 1<i>M.</i> The unit-cell parameters are <i>a</i> = 5.234(2), <i>b</i> = 9.042(4), <i>c</i> = 10.780(4) Å, β = 99.73(4)°; <i>V</i> = 502.8(6) ų; <i>Z</i> = 2. The strongest reflections of the powder X‑ray diffraction pattern (<i>d</i> Å, <i>I</i>, <i>hkl</i>) are 4.48, 35, 110; 3.70, 70, –112; 3.45, 44, 022; 2.608, 70, –201, 130; 2.580, 100, 200, –131; 2.241, 45, 220; 2.187, 80, –133. The holotype specimen is deposited in the Fersman Mineralogical Museum, Russian Academy of Sciences, Moscow catalogue no. 95894.</p>","PeriodicalId":12719,"journal":{"name":"Geology of Ore Deposits","volume":"37 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139762977","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":"Scandium Ore Occurrences in the Ancient Weathering Crust in the Nakyn Kimberlite Field of Yakutia","authors":"P. A. Ignatov, R. U. Eremenko, A. V. Tolstov, I. M. Ovchinnikov","doi":"10.1134/s1075701523060053","DOIUrl":"https://doi.org/10.1134/s1075701523060053","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>In the Malo-Botuobinsky, Sredne-Markhinsky, and Ygyattinsky diamond-bearing areas of the Western Yakutian kimberlite province, the prerequisites and signs of scandium deposits in ancient weathering crusts overlying Lower Paleozoic rocks and associated with zones of ancient reservoir and soil oxidation. According to X-ray fluorescence and ICP MS analyses, in the Nakyn kimberlite field of the Sredne-Markhinsky diamond-bearing region, promising ore occurrences and scandium concentration halos have been established in clay deposits of redeposited weathering crusts of the Dyakhtar Formation of Late Triassic–Early Jurassic age. They are confined to the erosional surface of Lower Paleozoic carbonate rocks and Middle Paleozoic traps, with monzonite porphyries and kimberlites cutting through them, covered on top by a sedimentary cover of Jurassic terrigenous deposits. Concentration anomalies of scandium in clays of the Dyakhtar Formation are localized mainly in deluvial clay deposits of paleowatersheds and gravitate to the intersections of tectonic disturbances. The depth of their occurrence does not exceed 100 m, which is quite favorable for the extraction of scandium by borehole in situ leaching. Concentrations of scandium were detected at one of the sites before 262 g/t in Late Triassic weathering crust, including material from a Middle Paleozoic gabbro dike, as well as overlying colluvial clays of the Dyakhtar formations with a maximum of 462 g/t.</p>","PeriodicalId":12719,"journal":{"name":"Geology of Ore Deposits","volume":"6 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139412856","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":"Occurrence of Carbonated Groundwater and Hydrocarbons at the Uranium Deposits of the Khiagda Ore Field (Republic of Buryatia)","authors":"I. N. Solodov, M. V. Nesterova","doi":"10.1134/s1075701523060090","DOIUrl":"https://doi.org/10.1134/s1075701523060090","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A generalization of unpublished and published data since 1985 on biogeochemical, hydrogeochemical, geochemical, mineralogical studies and soil geochemistry at uranium deposits of the Khiagda ore field in the Vitim uranium ore district made it possible to reveal a genetic relation of deep cold carbonated hydrocarbonate–magnesium groundwater containing dissolved hydrocarbons (HCs) to uranium mineralization and ore preservation. The through penetration of epigenetic HCs was traced from the disintegration zone of basement granitoids through overlying sedimentary ore-bearing and volcanosedimentary rocks up to overlying fractured basalts. The assemblage of clarified rocks–HCs–siderites–uranium phosphates U(IV) was commonly found. Carbonated hydrocarbonate–magnesium groundwater and anomalous HC contents in soils can be additional criteria for identifying the Vitim-type uranium deposits in the Trans-Baikal region.</p>","PeriodicalId":12719,"journal":{"name":"Geology of Ore Deposits","volume":"39 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139412896","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}