Russian Journal of Pacific Geology最新文献

Structure of the Lithosphere and Its Influence on Gold Mineralisation in Southeast Kamchatka 岩石圈结构及其对堪察加半岛东南部金矿化的影响

IF 0.8 4区地球科学

Russian Journal of Pacific Geology Pub Date : 2024-08-25 DOI: 10.1134/s1819714024700210

A. G. Nurmukhamedov, M. D. Sidorov

引用次数: 0

Volcanic Complexes and Tectonomagmatic Stages in the Evolution of Magellan Seamount Guyots (Pacific Ocean). Message 2: Tectonomagmatic Stages 麦哲伦海山盖奥特（太平洋）演化过程中的火山复合体和构造岩理阶段。信息 2：构造运动阶段

IF 0.8 4区地球科学

Russian Journal of Pacific Geology Pub Date : 2024-08-25 DOI: 10.1134/s1819714024700246

V. T. S’edin, S. P. Pletnev, T. E. Sedysheva

{"title":"Volcanic Complexes and Tectonomagmatic Stages in the Evolution of Magellan Seamount Guyots (Pacific Ocean). Message 2: Tectonomagmatic Stages","authors":"V. T. S’edin, S. P. Pletnev, T. E. Sedysheva","doi":"10.1134/s1819714024700246","DOIUrl":"https://doi.org/10.1134/s1819714024700246","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>There are five tectonomagmatic stages in the evolution of Magellan Seamount guyots: 1, Late Jurassic–Early Cretaceous (Earliest Cretaceous, ∼160–140 (?) Ma); 2, Early Cretaceous (Late Barremian (?)–Aptian–Albian, ∼127–96 Ma); 3, Late Cretaceous (Late Cenomanian (?)–Turonian–Early Campanian, ∼95–76 Ma); 4, Late Cretaceous (Late Campanian–Maastrichian, ∼74.5–66.0 Ma); 5, Cenozoic, 66–0 Ma. Each of the tectonomagmatic stages corresponds to a specific age complex of volcanic rocks of the Magellan Seamounts. Tectonomagmatic stages have different durations and played different roles in the evolution and formation of the modern structure of Magellan Seamount guyots. Each of the tectonomagmatic stages characterizes a specific geomorphological space of guyots (base, main part of the structure, small complicating overprinted second-order structures). In general, the tectonomagmatic stages in the evolution of the Magellan Seamounts agree well with the stages of the evolution of some other regions of the Pacific Ocean and correspond to the earlier established periods of their tectonomagmatic activation.</p>","PeriodicalId":49583,"journal":{"name":"Russian Journal of Pacific Geology","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142224815","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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Nizhne-Shсhapinsky Thermal Springs (Kamchatka) as an Example of Magnesium Carbon Dioxide Waters 下沙平斯克温泉（堪察加半岛）作为二氧化碳镁水的实例

IF 0.8 4区地球科学

Russian Journal of Pacific Geology Pub Date : 2024-08-25 DOI: 10.1134/s1819714024700180

N. A. Malik, Yu. A. Taran, I. Yu. Svirid, A. R. Tskhovrebova

{"title":"Nizhne-Shсhapinsky Thermal Springs (Kamchatka) as an Example of Magnesium Carbon Dioxide Waters","authors":"N. A. Malik, Yu. A. Taran, I. Yu. Svirid, A. R. Tskhovrebova","doi":"10.1134/s1819714024700180","DOIUrl":"https://doi.org/10.1134/s1819714024700180","url":null,"abstract":"<p>The article presents the results of hydrochemical studies of the Nizhne-Shchapinsky (Kipely) carbon dioxide thermal (39°C) springs in 2021. The springs are discharged within the Shchapinsky graben near the active Kizimen volcano. The results include macro- and microcomponent composition, isotopic composition of source water, some free gas components, and dissolved strontium. The results are discussed using previously published and archive data, taking into account the geological and structural position of the area, water–rock interaction, as well as using simple thermochemical calculations in order to explain the rare, but characteristic of the chemical composition of some carbon dioxide waters, predominance of magnesium over calcium. It has been shown that the waters of the Nizhne-Shchapinsky springs are formed as a result of mixing of two components: deeper and more heated sodium chloride water and more surface, less heated water with the composition Mg–Ca–<span>({text{HCO}}_{3}^{ - })</span>, formed due to interaction with carbonate-bearing rocks and CO<sub>2</sub> of igneous origin.</p>","PeriodicalId":49583,"journal":{"name":"Russian Journal of Pacific Geology","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190394","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}

引用次数: 0

Electrotomography Studies in the Uzon Caldera at Shaman Geyser (Kamchatka Peninsula) 在萨满间歇泉（堪察加半岛）的乌孙破火山口进行的电图研究

IF 0.8 4区地球科学

Russian Journal of Pacific Geology Pub Date : 2024-08-25 DOI: 10.1134/s1819714024700192

I. N. Modin, A. D. Skobelev, A. M. Valiulina, V. S. Stepchenkov

{"title":"Electrotomography Studies in the Uzon Caldera at Shaman Geyser (Kamchatka Peninsula)","authors":"I. N. Modin, A. D. Skobelev, A. M. Valiulina, V. S. Stepchenkov","doi":"10.1134/s1819714024700192","DOIUrl":"https://doi.org/10.1134/s1819714024700192","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>In 2020, in the caldera of Uzon volcano (Kamchatka Peninsula), electrical prospecting studies were carried out using the electrotomography method within the eastern thermal field near Shaman geyser. The geoelectric section is divided into three zones according to the level of electrical resistivity: relatively high-resistivity cold zones at the edges and a relatively low-resistivity hot zone in the center. The hot zone, situated at a depth of 5–20 m and hosting the Shaman geyser, is distinguished by anomalously low resistivity (less than 0.5 Ω m), which indicates the highest fracturing and saturation of rocks with fluid. Resistivity monitoring was carried out above the geyser using an Omega-48 electrical tomography station and two cables with lengths of 235 and 47 m. The first cable provided a survey depth of 60 m; the second, ∼12 m. Four phases of the geyser’s operation are distinguished on the difference geoelectric sections, constructed from the monitoring results: filling, outpouring, spouting, and steaming in the form of alternating positive and negative electric field anomalies. The channel to the geyser was found from the results of areal measurements.</p>","PeriodicalId":49583,"journal":{"name":"Russian Journal of Pacific Geology","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190395","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}

引用次数: 0

Debris Flow Activity and Specific Features of Debris Flow Formation in the Geysernaya River Valley (Kamchatka) 盖谢尔纳亚河谷（堪察加半岛）的泥石流活动和泥石流形成的具体特点

IF 0.8 4区地球科学

Russian Journal of Pacific Geology Pub Date : 2024-08-25 DOI: 10.1134/s1819714024700179

E. V. Lebedeva, S. S. Chernomorets

{"title":"Debris Flow Activity and Specific Features of Debris Flow Formation in the Geysernaya River Valley (Kamchatka)","authors":"E. V. Lebedeva, S. S. Chernomorets","doi":"10.1134/s1819714024700179","DOIUrl":"https://doi.org/10.1134/s1819714024700179","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Debris flow activity in the Geysernaya River basin was mapped. Large-scale debris flow processes due to the collapse of fragments of the valley’s left wall were observed in this area three times over the past 40 years. Three independent debris flow areas of the river basin were identified and described: the upper reaches of the river, the Levaya Geysernaya basin; the middle reaches of the river, below the dammed lake that formed in 2014; and the lower downstream part, below the dammed lake that existed in 2007–2014. Debris flow processes are typical of most tributaries of the Geysernaya River. Moreover, debris flows can be aseasonal in the left tributaries, because they are formed under constant heating and active gas–hydrothermal influence within the thermal fields. The landslide dam formed in 2014 is resistant to erosion, and an independent outburst of the dammed lake is unlikely. With further erosion of the 2007 dam and expansion of the breach in the dam body, collapse of its sides and debris flow in the lower part of the Geysernaya River valley should not be ruled out. Risks of rockfall, landslide, and debris flow processes, most likely on the left wall of the valley, should be taken into consideration in planning the development of recreation facilities.</p>","PeriodicalId":49583,"journal":{"name":"Russian Journal of Pacific Geology","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190391","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}

引用次数: 0

Morphological Characteristics and Chemical Composition of Placer Gold from the Kengeveem River Basin and First Data on Associated Platinum-Metal Mineralization (Magadan Oblast) 肯格韦姆河流域的原生金形态特征和化学成分以及相关铂金属矿化的初步数据（马加丹州）

IF 0.8 4区地球科学

Russian Journal of Pacific Geology Pub Date : 2024-08-25 DOI: 10.1134/s1819714024700258

E. D. Skilskaia, Sh. S. Kudaeva

{"title":"Morphological Characteristics and Chemical Composition of Placer Gold from the Kengeveem River Basin and First Data on Associated Platinum-Metal Mineralization (Magadan Oblast)","authors":"E. D. Skilskaia, Sh. S. Kudaeva","doi":"10.1134/s1819714024700258","DOIUrl":"https://doi.org/10.1134/s1819714024700258","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The paper presents a study of typomorphic characteristics of placer gold from tributaries of the Kengeveem River, Magadan oblast. The placer gold was studied by optical and scanning electron microscopy at the Institute of Volcanology and Seismology, Far Eastern Branch, Russian Academy of Sciences. As a result, the first information on the morphology, internal structure, and chemical composition of placer gold from the southeastern Taigonos Peninsula was obtained. Three mineral types of the gold were determined. The first type is dominant. Its grains are characterized by subore morphology, with weak and medium roundness. Only Au and Ag are present in the composition of native gold, other macrocomponents were not found. The gold fineness is 750‒950‰. Some gold grains bear signs of supergene transformation, which is expressed in the development of high-fineness gold rims and intergranular veins. The second type of the gold is represented by well-rounded plates with a fineness of 980‒990‰. The third type is loose aggregates of secondary high-grade mustard gold. The obtained data allowed us to determine the different transport distances of native gold and to consider the low-sulfide epithermal Au‒Ag mineralization and presumably distal gabbroids as the primary sources of gold.</p>","PeriodicalId":49583,"journal":{"name":"Russian Journal of Pacific Geology","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190129","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}

引用次数: 0

On the 90th Anniversary of the Eruption of the Taketomi Side Volcano (Atlasov Island, Kuril Island Arc) 纪念竹富侧火山喷发 90 周年（千岛群岛阿特拉斯洛夫岛）

IF 0.8 4区地球科学

Russian Journal of Pacific Geology Pub Date : 2024-08-25 DOI: 10.1134/s1819714024700222

V. A. Rashidov

引用次数: 0

Authigenic Minerals in Phanerozoic Volcanosedimentary Deposits of the Northern Part of the Asian Continent–Pacific Ocean Transition Zone 亚洲大陆-太平洋过渡带北部新生代火山沉积矿床中的自生矿物

IF 0.8 4区地球科学

Russian Journal of Pacific Geology Pub Date : 2024-08-25 DOI: 10.1134/s1819714024700209

A. V. Mozherovsky

{"title":"Authigenic Minerals in Phanerozoic Volcanosedimentary Deposits of the Northern Part of the Asian Continent–Pacific Ocean Transition Zone","authors":"A. V. Mozherovsky","doi":"10.1134/s1819714024700209","DOIUrl":"https://doi.org/10.1134/s1819714024700209","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Authigenic minerals have been studied in Phanerozoic volcanosedimentary deposits in the northern part of the Asian continent–Pacific Ocean transition zone. The following were found: chlorite, mica, corrensite, rectorite, defective chlorite, kaolinite, smectite, calcite, barite, gypsum, epsomite, zeolites, cristobalite, quartz, and goethite. The minerals corrensite and rectorite have significant indicative properties, as do the assemblages corrensite–laumontite, corrensite–epsomite–authigenic calcite and mica–kaolinite–quartz. Such a range of minerals indicates that the thickness of sediments in the studied basins could reach 3–5 km, and their formation temperature could be more than 150°C. The mica–kaolinite assemblage may indicate epicontinental sedimentation conditions associated with coal formation on nearby land, the corrensite–chlorite assemblage may indicate conditions favorable for the evaporation of seawater, and the presence of laumontite in it may indicate periodic calcium supply to the sedimentary basin. The periods of mineral formation, possibly associated with global climatic events, have been identified: 113–120, 110–113, 105–110, 93–95, 72–83, 61–72, 56–61, 33–56 Ma, which can serve as benchmarks to determine sedimentation conditions and the framework for more reliable stratigraphic constructions.</p>","PeriodicalId":49583,"journal":{"name":"Russian Journal of Pacific Geology","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142224858","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}

引用次数: 0

Findings from Deep Magnetotelluric Studies in the Sloboda Geodynamic Intersection (East European Platform) 斯洛博达地球动力交汇处（东欧地台）的深层磁能研究结果

IF 0.8 4区地球科学

Russian Journal of Pacific Geology Pub Date : 2024-08-25 DOI: 10.1134/s1819714024700167

V. A. Kulikov, Iv. M. Varentsov, P. V. Ivanov, A. P. Ionicheva, S. Yu. Kolodyazhnyi, A. V. Korolkova, I. N. Lozovsky, T. A. Rodina, A. G. Yakovlev

{"title":"Findings from Deep Magnetotelluric Studies in the Sloboda Geodynamic Intersection (East European Platform)","authors":"V. A. Kulikov, Iv. M. Varentsov, P. V. Ivanov, A. P. Ionicheva, S. Yu. Kolodyazhnyi, A. V. Korolkova, I. N. Lozovsky, T. A. Rodina, A. G. Yakovlev","doi":"10.1134/s1819714024700167","DOIUrl":"https://doi.org/10.1134/s1819714024700167","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The Sloboda Geodynamic Intersection is considered an convergence zone for major segments, aulacogens, faults, and suture zones of the East European Platform. Between 2020 and 2022, researchers of the Geological Faculty of Moscow State University and the Geoelectromagnetic Research Center of Branch of the Schmidt Institute of Physics of the Earth, Russian Academy of Sciences (GEMRC IPE RAS) conducted deep magnetotelluric surveys in this region, performed along the Pushkinskiye Gory–Andreapol (PA), Sebezh–Velikiye Luki–Rzhev (SVR), and Ostrov–Ostashkov (OO) profiles. Qualitative analysis of the data made it possible to assess the dimensionality of the studied medium, the total longitudinal conductivity of the sedimentary cover, and the dominant strike of the conductive structures. Quantitative interpretation using 1D, 2D, and 3D inversions resulted in geoelectric models comprising a conductive sedimentary cover and a highly resistive basement. Transcrustal zones of enhanced electrical conductivity interpreted as the southwest extension of the Ilmen–Ladoga anomaly were consistently identified within the depth range of 10–40 km. These conductivity anomalies are attributed to the deep subsidence of heavily tectonized and metamorphosed sedimentary rocks initially saturated with organic and carbonate matter.</p>","PeriodicalId":49583,"journal":{"name":"Russian Journal of Pacific Geology","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190390","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}

引用次数: 0

Relief Forms on the Surface of Cosmic Spherules as Evidence for Their Origin 宇宙球体表面的浮雕形式是其起源的证据

IF 0.8 4区地球科学

Russian Journal of Pacific Geology Pub Date : 2024-08-25 DOI: 10.1134/s1819714024700234

O. L. Savelyeva, D. P. Savelyev, O. A. Zobenko

引用次数: 0