Doklady Earth Sciences最新文献_第6页

Sm‒Nd Age of Sviatonossites of the Svyatoi Nos Peninsula (Eastern Baikal Region) 斯维亚托伊诺斯半岛（东贝加尔地区）斯维亚托诺石的 Sm-Nd 年龄

IF 0.9 4区地球科学

Doklady Earth Sciences Pub Date : 2024-07-18 DOI: 10.1134/s1028334x24602554

V. I. Levitskiy, V. P. Kovach, A. B. Kotov, L. Z. Reznitsky, I. V. Levitskiy, N. Y. Zagornaya

{"title":"Sm‒Nd Age of Sviatonossites of the Svyatoi Nos Peninsula (Eastern Baikal Region)","authors":"V. I. Levitskiy, V. P. Kovach, A. B. Kotov, L. Z. Reznitsky, I. V. Levitskiy, N. Y. Zagornaya","doi":"10.1134/s1028334x24602554","DOIUrl":"https://doi.org/10.1134/s1028334x24602554","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Sviatonossites are syenites with andradite garnet, a rare type of igneous rocks described by P. Eskola in 1913 on the Svyatoi Nos Peninsula (Lake Baikal). Due to the absence of zircon in the rocks, which makes it possible to date them reliably by the U‒Pb method, geochronological Sm–Nd studies of the bulk composition and minerals are carried out. As a result, two estimated periods of the formation of sviatonossites are obtained. According to the bulk composition and four minerals (garnet, pyroxene, potassium feldspar, and apatite), the age is 262 ± 21 Ma (RMSD = 1.6), and according to the bulk composition and garnet, it is 274 ± 25 Ma (RMSD = 0). The results obtained coincide with the timing of tectonic–metamorphic and igneous processes associated with the formation of the Eastern Transbaikalia segment of the Central Asian (Mongol–Okhotsk) folded belt. Sviatonossites in the complexes of mobile (folded) belts framed by the Siberian Craton are indicator rocks reflecting the manifestation of mantle–crustal interaction.</p>","PeriodicalId":11352,"journal":{"name":"Doklady Earth Sciences","volume":"70 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141744822","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}

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First Findings of Fossil Pollen of Ancestor Forms of Cathaya Conifers, a Modern Relic, and a Climate Indicator in the Paleogene and Neogene of West Siberia (Kulunda) 首次发现西西伯利亚（库伦达）古近纪和新近纪松科植物祖先形态的花粉化石、现代遗物和气候指标

IF 0.9 4区地球科学

Doklady Earth Sciences Pub Date : 2024-07-18 DOI: 10.1134/s1028334x24602177

O. B. Kuzmina, B. L. Nikitenko

{"title":"First Findings of Fossil Pollen of Ancestor Forms of Cathaya Conifers, a Modern Relic, and a Climate Indicator in the Paleogene and Neogene of West Siberia (Kulunda)","authors":"O. B. Kuzmina, B. L. Nikitenko","doi":"10.1134/s1028334x24602177","DOIUrl":"https://doi.org/10.1134/s1028334x24602177","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The palynological analysis of the Paleogene and Neogene sequences of the southern part of West Siberia (borehole 2, Novosibirsk oblast) showed that the conifer bisaccate pollen in the spore–pollen spectra exhibits a series of morphological features allowing its comparison with the modern pollen of <i>Cathaya argyrophylla</i> Chun et Kuang. These palynomorphs belong to relict vegetation, which currently occurs in the wet subtropical climate of South China, and are important climate indicators. The palynomorphs are ascribed to the ancestral forms of the species <i>Cathaya</i> as <i>Abietineaepollenites sellowiiformis</i> (Zaklinskaja) Doweld 2018. The pollen is described, and its distribution along the section is shown. The maximum amount of the <i>A. sellowiiformis</i> pollen (up to 23.7%) is confined to the upper part of the Oligocene and the Lower Miocene and its last appearance is recognized in the Middle–Upper Miocene. These data expand our knowledge on the geographic range of the <i>Cathaya</i> ancestral form and its role in plant communities of Central Asia in the Cenozoic.</p>","PeriodicalId":11352,"journal":{"name":"Doklady Earth Sciences","volume":"77 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141744820","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}

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Magnetic and Ionospheric Effects of a Series of Strong Earthquakes on April 2‒3, 2024 (Taiwan) 2024 年 4 月 2-3 日一系列强震的磁场和电离层影响（台湾）

IF 0.9 4区地球科学

Doklady Earth Sciences Pub Date : 2024-07-18 DOI: 10.1134/s1028334x24602670

V. V. Adushkin, A. A. Spivak, S. A. Riabova, A. V. Tikhonova

{"title":"Magnetic and Ionospheric Effects of a Series of Strong Earthquakes on April 2‒3, 2024 (Taiwan)","authors":"V. V. Adushkin, A. A. Spivak, S. A. Riabova, A. V. Tikhonova","doi":"10.1134/s1028334x24602670","DOIUrl":"https://doi.org/10.1134/s1028334x24602670","url":null,"abstract":"<p><b>Abstract</b>—The disturbances of the geomagnetic field in the surface atmosphere were considered during a series of strong earthquakes that occurred on April 2–3, 2024, in the vicinity of the island of Taiwan. The data from the Mikhnevo Geophysical Observatory of the Sadovskii Institute of Geosphere Dynamics, Russian Academy of Sciences, and the observatories of the international INTERMAGNET network were analyzed. It was shown that in the absence of sole-related global disturbances of the Earth’s magnetic field, earthquakes were accompanied by geomagnetic variations with a maximum amplitude of ~10 nT and a total duration of about four hours. The delay time of the magnetic effect relative to the main shock of the first earthquake was ~60 min. The ionospheric effect of the event considered was established in the form of variations in the critical frequency of the <i>F</i>2 layer of the ionosphere on the basis the ionograms of height–frequency sounding obtained at the Okinawa ionospheric monitoring station and freely available on the website of the Japanese National Institute of Information and Communication Technologies.</p>","PeriodicalId":11352,"journal":{"name":"Doklady Earth Sciences","volume":"16 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141744827","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}

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Frozen Mummy of a Subadult Woolly Rhinoceros Coelodonta antiquitatis (Blumenbach, 1799) from the Late Pleistocene of Yakutia 来自雅库特晚更新世的亚成年毛犀牛 Coelodonta antiquitatis (Blumenbach, 1799) 的冰冻木乃伊

IF 0.9 4区地球科学

Doklady Earth Sciences Pub Date : 2024-07-01 DOI: 10.1134/s1028334x24602438

G. G. Boeskorov, O. F. Chernova, A. V. Protopopov, A. N. Neretina, M. V. Shchelchkova, R. I. Belyaev, A. A. Kotov

{"title":"Frozen Mummy of a Subadult Woolly Rhinoceros Coelodonta antiquitatis (Blumenbach, 1799) from the Late Pleistocene of Yakutia","authors":"G. G. Boeskorov, O. F. Chernova, A. V. Protopopov, A. N. Neretina, M. V. Shchelchkova, R. I. Belyaev, A. A. Kotov","doi":"10.1134/s1028334x24602438","DOIUrl":"https://doi.org/10.1134/s1028334x24602438","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>In this study we describe a newly found frozen mummy of a young woolly rhinoceros (4–4.5 years old), dated to the Karginian Interstadial of the Late Neopleistocene (32 440 ± 140 years ago). The dimensional characteristics of this specimen are compared to those of 1- to 1.5-year-old juvenile, as well as adults, of <i>Coelodonta antiquitatis</i> found previously. Studies of the new find allowed to fill some of the information gaps concerning the features of the ontogenesis of the woolly rhinoceros, illustrate age-related changes in the color of its fur, and reveal a new anatomical peculiarity of <i>C. antiquitatis</i>—the presence of a fatty hump. Numerous remains of microscopic crustaceans were found in the wool, including representatives of the genus <i>Moina</i> (Cladocera: Moinidae), currently absent in the region. The latter were relatively common in Pleistocene temporary water bodies of Yakutia. The carcass of the rhinoceros was buried in a shallow (apparently temporary), fishless reservoir.</p>","PeriodicalId":11352,"journal":{"name":"Doklady Earth Sciences","volume":"2013 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141524893","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}

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Sensitivity of the Chandler Wobble Period of Mars to the Parameters of the Rheological Model 火星钱德勒摆动周期对流变模型参数的敏感性

IF 0.9 4区地球科学

Doklady Earth Sciences Pub Date : 2024-07-01 DOI: 10.1134/s1028334x24602475

E. A. Kulik, T. V. Gudkova

引用次数: 0

The Kharbei Amphibolite–Gneiss Complex (Polar Urals): P–T Evolution and Results of U–Pb LA-ICP-MS Isotopic Study of Metamorphic Zircon 哈尔贝闪长岩-片麻岩复合体（极地乌拉尔）：变质锆石的 P-T 演变和 U-Pb LA-ICP-MS 同位素研究结果

IF 0.9 4区地球科学

Doklady Earth Sciences Pub Date : 2024-07-01 DOI: 10.1134/s1028334x24602761

N. S. Ulyasheva, A. S. Shuyskiy, V. B. Khubanov

{"title":"The Kharbei Amphibolite–Gneiss Complex (Polar Urals): P–T Evolution and Results of U–Pb LA-ICP-MS Isotopic Study of Metamorphic Zircon","authors":"N. S. Ulyasheva, A. S. Shuyskiy, V. B. Khubanov","doi":"10.1134/s1028334x24602761","DOIUrl":"https://doi.org/10.1134/s1028334x24602761","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>In the study of the Khanmeikhoi Formation of the central zone of the Kharbei amphibolite–gneiss complex, it was shown that the amphibolites, schists, and plagiogneisses common here form two primary igneous series: low-alumina tholeiitic metabasalts of normal alkalinity and a differentiated series of high-alumina rocks from metatrachybasalts to metarhyolites with high alkalinity. According to the zoning of garnets, progressive and regressive branches of metamorphism are recorded, the peak conditions of which, according to calculations using the winTWQ program, correspond to the high-temperature stage of the amphibolite facies at high pressures (<i>T</i> = 690–750°C, <i>P</i> = 8.1–9.4 kbar). For the first time, metamorphic zircon from Grt-Bi plagiogneiss with low Th/U ratios of 0.01–0.04 and weakly expressed positive cerium (Ce/Ce* = 1.4–1.7) and negative europium (Eu/Eu* = 0.7–0.9) has been identified in the anomalies, the age of which, according to the results of the U–Pb LA-ICP-MS isotope method, is estimated to be Early Carboniferous (359–341 Ma). This time apparently characterizes the transition from the peak of metamorphism to the regressive stage associated with the exhumation of rocks. The results obtained indicate the formation of the Kharbei amphibolite–gneiss complex during the formation of the Ural orogen and allow us to consider it as an indicator of Paleozoic collision processes.</p>","PeriodicalId":11352,"journal":{"name":"Doklady Earth Sciences","volume":"21 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141532064","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}

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Dynamics of Surface Heat Fluxes in the Tropical Zone of the Atlantic during Periods of Origination of Hurricanes 飓风发源期大西洋热带地区地表热通量的动态变化

IF 0.9 4区地球科学

Doklady Earth Sciences Pub Date : 2024-07-01 DOI: 10.1134/s1028334x24601949

A. G. Grankov

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The Effect of GO on TiO2-doped PVDF Nanofiltration Membrane Performance: Synergistic Filtration of Large and Small Molecules Facilitated the Removal of Small Molecule Contaminants GO 对掺杂 TiO2 的 PVDF 纳滤膜性能的影响：大分子和小分子的协同过滤促进了小分子污染物的去除

IF 0.9 4区地球科学

Doklady Earth Sciences Pub Date : 2024-07-01 DOI: 10.1134/s1028334x24601329

Jiacang Fei

{"title":"The Effect of GO on TiO2-doped PVDF Nanofiltration Membrane Performance: Synergistic Filtration of Large and Small Molecules Facilitated the Removal of Small Molecule Contaminants","authors":"Jiacang Fei","doi":"10.1134/s1028334x24601329","DOIUrl":"https://doi.org/10.1134/s1028334x24601329","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>In this study, the synthesis of poly(vinylidene fluoride) composite membranes incorporated with titania (TiO<sub>2</sub>) nanoparticles and graphene oxide (GO) was demonstrated. The effect of GO on the surface morphology of the membrane was observed by scanning electron microscopy, indicating the typical membrane looseness and porosity caused by GO. The chemical properties and composition of the membrane were confirmed by X-ray diffraction and Fourier transform infrared spectroscopy, indicating the as-prepared membrane materials with reasonably doped TiO<sub>2</sub> and GO. The effect of the amount of doped GO on the microstructure and performance of the PVDF/TiO<sub>2</sub>/GO membrane was systematically investigated. GO enhances the flux of the PVDF membrane in the early filtration stage and enhances the retention of pollutants. In addition, it was found that the synergistic filtration of large and small molecules improved the removal of small molecule contaminants. Therefore, the results of this study offered a new technology for the synergistic treatment of dye wastewater with macromolecule pollutants.</p>","PeriodicalId":11352,"journal":{"name":"Doklady Earth Sciences","volume":"13 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141524892","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}

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The Role of Rare Alkalis (Li, Rb, and Cs) as Indicators in Water of the Baikal Geosystem, Russia 稀有碱（锂、铷和铯）作为俄罗斯贝加尔湖地质系统水体指标的作用

IF 0.9 4区地球科学

Doklady Earth Sciences Pub Date : 2024-07-01 DOI: 10.1134/s1028334x2460261x

V. I. Grebenshchikova, M. I. Kuzmin

引用次数: 0

Stages of Granitoid Magmatism in the Eastern Part of the Kazakhstan Composite Continent in the Early–Middle Paleozoic 早-中古生代哈萨克斯坦复合大陆东部的花岗岩岩浆活动阶段

IF 0.9 4区地球科学

Doklady Earth Sciences Pub Date : 2024-07-01 DOI: 10.1134/s1028334x24602451

P. D. Kotler, S. V. Khromykh, K. E. Degtyarev, A. V. Kulikova, M. D. Tsareva, V. A. Penkina

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