Russian Geology and Geophysics最新文献_第8页

Lithological and Geochemical Indicators of Ice Gouging: Evidences from Holocene Sediments in the East Siberian Sea 冰凿的岩石和地球化学指标：来自东西伯利亚海全新世沉积物的证据

IF 1.1 4区地球科学

Russian Geology and Geophysics Pub Date : 2023-04-25 DOI: 10.2113/rgg20234528

А.V. Alatortsev, А.N. Kolesnik, X. Shi, L. Hu, V. Karnaukh, А.S. Astakhov

引用次数: 0

Magnetovariational Sounding in South Vietnam according to the Dalat Observatory Data 根据大叻天文台资料的南越磁变探测

IF 1.1 4区地球科学

Russian Geology and Geophysics Pub Date : 2023-04-25 DOI: 10.2113/rgg20224481

S. Starzhinskii

{"title":"Magnetovariational Sounding in South Vietnam according to the Dalat Observatory Data","authors":"S. Starzhinskii","doi":"10.2113/rgg20224481","DOIUrl":"https://doi.org/10.2113/rgg20224481","url":null,"abstract":"\u0000 ––This paper describes a three-dimensional inversion of magnetovariational tippers calculated for the Dalat observatory in South Vietnam on the basis of the geomagnetic variation records obtained from the INTERMAGNET network. The frequency dependences of the tippers are inverted using the ModEM software, which makes it possible to construct a geoelectric model of the Dalat zone in a 300 × 300 × 150-km spatial region (x, y, and z axes, respectively) with its center located at the observatory. The resulting model of the geoelectric section contains both surface and deep conductive blocks located at the top and bottom of the Earth’s crust and in the upper mantle. The central part of the upper local conducting block with a resistivity of 0.5–1.0 Ohm⋅m is located near the observatory at a depth of 12–14 km. A more massive conductive block is located to the east of the observatory in the coastal region. Its central part with a resistivity of 0.3 Ohm⋅m is located at a depth of 24–28 km and extends under the continent along the coast for about 80 km. The roots of this block are visible to depths of ~100 km in the South China Sea shelf region. It is assumed that the high electrical conductivity of these blocks is provided by melting in the presence of aqueous fluids and granite series rocks, which are widely distributed in the Dalat zone. The crystallization depths of the samples of these granites estimated from the geothermobarometry data are close to the depth intervals of conductive blocks in the model section, which was also observed in the interpretation of magnetotelluric soundings in Southern Tibet, where granitoid rocks are widespread.","PeriodicalId":49587,"journal":{"name":"Russian Geology and Geophysics","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48656535","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

Composition of the Fluid in Carbonate- and Chlorine-Bearing Pelite near the Second Critical Point: Results of Diamond Trap Experiments 第二临界点附近含碳酸盐和含氯泥铁矿流体组成:金刚石圈闭实验结果

IF 1.1 4区地球科学

Russian Geology and Geophysics Pub Date : 2023-04-21 DOI: 10.2113/rgg20234555

A. Sokol, O.A. Koz’menko, A. Kruk, S. F. Nechepurenko

{"title":"Composition of the Fluid in Carbonate- and Chlorine-Bearing Pelite near the Second Critical Point: Results of Diamond Trap Experiments","authors":"A. Sokol, O.A. Koz’menko, A. Kruk, S. F. Nechepurenko","doi":"10.2113/rgg20234555","DOIUrl":"https://doi.org/10.2113/rgg20234555","url":null,"abstract":"\u0000 ––The composition of the fluid in carbonate- and chlorine-bearing pelite was experimentally studied at 3.0 GPa and 750 and 900 ºC, using the diamond trap method. The results of inductively coupled plasma atomic-emission spectrometry (ICP AES) and mass balance calculations showed that a supercritical fluid formed in the studied system at 3.0 GPa and 750 °C. The fluid is Si- and Al-rich and contains 30–50 wt.% H2O + CO2 and up to 1 wt.% Cl. The contents of other major elements decrease in the order: K > Na > Сa ≈ Fe > Mg > Mn > Ti ≈ P. Compared with supercritical fluids appeared in the systems pelite–H2O and eclogite–H2O, the fluid with high CO2 and Cl contents is richer in Fe, Ca, Mg, and Mn but poorer in Si. Silicate melt generated in this system at 900 ºС has a composition typical of pelitic melt. Our experiments reveal a set of fingerprints of element fractionation between a supercritical fluid and solids forming an eclogite-like association, namely, high mobility of P, Sr, and B and low mobility of Li and S. Thus, a supercritical fluid compositionally similar to the pelitic melts generated in subduction zones can transfer significant amounts of both volatiles (H2O, CO2, Cl, and P) and major components to the regions of arc magma generation. It is important that supercritical fluids should have trace element signatures of diluted low-temperature fluids.","PeriodicalId":49587,"journal":{"name":"Russian Geology and Geophysics","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49237051","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: 2

Petrology of the Kureika Graphite Deposit in the Roof of the First-Rapid Trap Intrusion (Siberian Platform) 西伯利亚地台第一快速圈闭侵入顶Kureika石墨矿床岩石学特征

IF 1.1 4区地球科学

Russian Geology and Geophysics Pub Date : 2023-04-18 DOI: 10.2113/rgg20234492

V. V. Ryabov, V. Ponomarchuk

{"title":"Petrology of the Kureika Graphite Deposit in the Roof of the First-Rapid Trap Intrusion (Siberian Platform)","authors":"V. V. Ryabov, V. Ponomarchuk","doi":"10.2113/rgg20234492","DOIUrl":"https://doi.org/10.2113/rgg20234492","url":null,"abstract":"\u0000 ––The leading role of lithostratigraphic, structural/tectonic, magmatic, metamorphic, and fluid geologic factors in the formation of a graphite deposit is substantiated. We present the petrographic and chemical compositions of rocks and minerals of igneous rocks, the δ13С values of graphites and calcitites, the δ18O values of carbonates, the δ34S values of sulfides, and the 87Sr/86Sr and 87Rb/86Sr ratios in calcitites and microdolerite injections. The thermal effect of magmatic melt on coal led to its degassing and graphitization. The steaming of microdolerite injections with hydrocarbon fluids was probably accompanied by the removal of iron from them and the crystallization of low-Fe clinopyroxene, and the interaction of fluids with basaltic melt in the upper endocontact zone of the intrusion led to the segregation of the melt and the formation of a globular structure of rocks. The presence of a calcitite lens and a sulfide vein between the roof of the intrusion and the graphite bed is due to the earlier intrusion of sulfate salt melt and its subsequent interaction with hydrocarbon fluids, which resulted in sulfate reduction and the formation of calcitites. The sulfate reduction terminated with iron sulfurization in the basaltic melt and the formation of a sulfide vein. Sulfate salt melt was a source of heavy sulfur isotope (δ34S = 14.9–17.5‰) for sulfides and of calcium for calcitites. The similar isotope compositions of calcitites (δ13СPDB = –22.5 to –23.5‰), coals (–22.6 to –25.5‰, n = 25), and graphites (–23.5 to –25.0) suggest that coal is a source of carbon for calcitites. In the isotopic compositions of strontium (87Sr/86Sr ≈ 0.70834–0.70885) and oxygen δ18O ≈ 15‰) the calcitites are similar to the Devonian evaporites of the Siberian Platform. The isotope data (δ34S, δ18O, δ13С, and 87Rb/86Sr) point to the participation of the coal seam and anhydrite as sources of substance in the formation of calcitite and sulfide mineralization.","PeriodicalId":49587,"journal":{"name":"Russian Geology and Geophysics","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46065957","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

Organic Geochemistry of Carbonate Rocks, Silicites and Black Shales of the Vendian (Ediacaran) Khatyspyt Formation, Northeastern Siberia 西伯利亚东北部Vendian（Ediacaran）Khatyspyt组碳酸盐岩、硅质岩和黑色页岩的有机地球化学

IF 1.1 4区地球科学

Russian Geology and Geophysics Pub Date : 2023-04-16 DOI: 10.2113/rgg20224527

D. Melnik, T. Parfenova, D. Grazhdankin, V. Rogov

{"title":"Organic Geochemistry of Carbonate Rocks, Silicites and Black Shales of the Vendian (Ediacaran) Khatyspyt Formation, Northeastern Siberia","authors":"D. Melnik, T. Parfenova, D. Grazhdankin, V. Rogov","doi":"10.2113/rgg20224527","DOIUrl":"https://doi.org/10.2113/rgg20224527","url":null,"abstract":"\u0000 —The paper presents the results of the study of organic geochemistry of carbonate rocks, silicites, and calcareous mudstones of the Vendian (Ediacaran) Khatyspyt Formation in the northeast of the Siberian Platform. The distribution of dispersed organic matter (OM) is shown to be uneven. The formation comprises carbonate-dominated intervals depleted in OM, with total organic carbon content (TOC) < 0.1%, or weakly enriched in OM (TOC up to 0.4%), interstratified with carbonate-shale, carbonate-shale-siliceous, carbonate-siliceous and siliceous intervals enriched in OM (TOC up to 1–4%). There is also a thin-layered calcareous mudstones anomalously enriched in OM (black shales with TOC at 10%) cropping out in the Khorbusuonka River valley (unit thickness 10 cm). The redox conditions in the water column varied during deposition of the Khatyspyt Formation. Certain intervals characterize a stratified water column and euxinic bottom water conditions. During the study, the assessment was conducted of the OM catagenesis and the generative potential of the Khatyspyt Formation. Based on the results of geochemical study and the synthesis of information on the geological structure of sedimentary succession in the northeastern Siberian Platform, the Khatyspyt Formation has been evaluated as one of the hydrocarbon sources for the territory.","PeriodicalId":49587,"journal":{"name":"Russian Geology and Geophysics","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48242769","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: 1

Lamprophyres of the Southern Coast of Novaya Zemlya: Composition, Tectonomagmatic Position, and New Age Data Novaya Zemlya南部海岸的煌斑岩：成分、构造岩浆位置和新时代数据

IF 1.1 4区地球科学

Russian Geology and Geophysics Pub Date : 2023-03-28 DOI: 10.2113/rgg20224456

E. Korago, N. Stolbov, M. Burnaeva, I. M. Vasil’eva

{"title":"Lamprophyres of the Southern Coast of Novaya Zemlya: Composition, Tectonomagmatic Position, and New Age Data","authors":"E. Korago, N. Stolbov, M. Burnaeva, I. M. Vasil’eva","doi":"10.2113/rgg20224456","DOIUrl":"https://doi.org/10.2113/rgg20224456","url":null,"abstract":"\u0000 —The Novaya Zemlya Archipelago is an early Cimmerian folded structure located on the northern periphery of the Ural–Mongolian fold belt. The geologic development of the archipelago is well-studied and serves as a benchmark for interpolating its features to the shelf of the surrounding water areas, whose sedimentary cover contains large accumulations of hydrocarbon raw materials. In addition to the stratified section of essentially sedimentary rocks, it is of interest to study igneous formations, which clearly mark tectonic events in the geologic history of the archipelago. In the light of this, the age of these formations remains important. The age of some magmatic complexes of the archipelago is still debatable. This paper focuses upon a lamprophyre complex in the extreme south of Novaya Zemlya, which has been dated at the Late Proterozoic or Late Proterozoic–early Paleozoic(?) until recently. The results obtained for the U–Pb age of apatites contained in the rocks of this complex confirm the Devonian age of the lamprophyres, and it is suggested by estimates based on the presented data that the emplacement time lies in a range from 360 to 398 Ma. This means that they might be associated with riftogenic processes on Novaya Zemlya since the second half of the Early Devonian, when the stage of short-term stable carbonate sedimentation (in the first half of the Devonian Period) was replaced by the initiation of a new structural–formational zonal sequence.","PeriodicalId":49587,"journal":{"name":"Russian Geology and Geophysics","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45728800","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

The Azas Ice Sheet and Its Role in the Formation of Late Pleistocene Ice-Dammed Lakes in Southern Siberia: Case Study of Upper Kharal Paleolake 阿扎尔斯冰盖及其在西伯利亚南部晚更新世冰坝湖形成中的作用——以哈拉尔古湖上游为例

IF 1.1 4区地球科学

Russian Geology and Geophysics Pub Date : 2023-03-24 DOI: 10.2113/rgg20224494

I. Novikov, D. Nazarov, M. Mikharevich, A.S. Gladysheva, M. V. Ruchkin, S. G. Prudnikov

{"title":"The Azas Ice Sheet and Its Role in the Formation of Late Pleistocene Ice-Dammed Lakes in Southern Siberia: Case Study of Upper Kharal Paleolake","authors":"I. Novikov, D. Nazarov, M. Mikharevich, A.S. Gladysheva, M. V. Ruchkin, S. G. Prudnikov","doi":"10.2113/rgg20224494","DOIUrl":"https://doi.org/10.2113/rgg20224494","url":null,"abstract":"\u0000 —The paper focuses on the surface topography and deposits associated with the Late Pleistocene ice-dammed lake in the valley of the Kharal River dammed by the Azas ice sheet in a depression between the East Sayan and Akademik Obruchev Range. The study includes paleogeographic reconstructions for the time spans before the lake formation and drainage; reconstruction of vegetation in the lake area based on pollen and paleocarpological data; and dating by optically stimulated luminescence (OSL) and 40Ar/39Ar methods. The OSL and Ar–Ar dates provide more rigorous constraints on the history of deposition and topography in the western Serligkhem Basin. The territory was affected by erosion and subsequent basaltic volcanism at 6.9 ± 0.7 and 2.2 ± 0.7 Ma. The erosion valleys were dammed by the edge of an ice sheet and then by its moraine, which produced large Upper Kharal damlake. According to OSL data, the lake existed between 36 ± 4 and 14 ± 3 ka BP. The related glacial, glaciolimnic, and glaciofluvial facies in the area were deposited at the end of the Late Pleistocene (stages III and IV of regional stratigraphy).","PeriodicalId":49587,"journal":{"name":"Russian Geology and Geophysics","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47482928","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

Quaternary Deposits of the Pritaymyr Islands (the Kara Shelf) 普里塔米尔群岛第四纪沉积物（卡拉大陆架）

IF 1.1 4区地球科学

Russian Geology and Geophysics Pub Date : 2023-03-24 DOI: 10.2113/rgg20224510

E. Gusev, Ya.D. Yarzhembovsky, A. Makariev, A. Molodkov, F. Maksimov, N. V. Kupriyanova, N. A. Kostromina, O. Rudenko, A. Krylov, V. Sharin, A. Sharapova

引用次数: 0

Newly Acquired Data on the Geologic Structure and Hydrocarbon Potential in the Eastern Part of the East Siberian Sea Shelf 新获得的东西伯利亚海架东部地质结构和油气潜力数据

IF 1.1 4区地球科学

Russian Geology and Geophysics Pub Date : 2023-03-23 DOI: 10.2113/rgg20234522

G. Zavarzina, D. S. Shapabaeva, O. Zakharova

{"title":"Newly Acquired Data on the Geologic Structure and Hydrocarbon Potential in the Eastern Part of the East Siberian Sea Shelf","authors":"G. Zavarzina, D. S. Shapabaeva, O. Zakharova","doi":"10.2113/rgg20234522","DOIUrl":"https://doi.org/10.2113/rgg20234522","url":null,"abstract":"\u0000 —We report results of an integrated interpretation of geophysical data (2D CDP seismic acquisition and gravity and magnetic survey) conducted by Gazpromneft Science and Technology Center in the North Wrangel lease block on the East Siberian Sea shelf. The newly obtained geophysical data have allowed us to update the geological model of the sedimentary cover within the North Wrangel lease block, to clarify the limits of the Drem-Khed Trough, to reconstruct the conditions under which sedimentary complexes formed, and to identify possible promising oil and gas accumulation zones. We were able to determine the position of the main stratigraphic unconformities, to propose several approaches to their interpretation, and to identify the clinoform architecture of the Aptian–Albian and Cenozoic complexes within the Drem-Khed Trough. The integrated review of geological and geophysical data has been helpful in refining the framework of the main structures adjoining the trough and predicting the extent of potential reservoirs and oil and gas source rocks throughout the sedimentary cover. The Upper Cretaceous and Cenozoic complexes are regarded as oil and gas exploration targets.","PeriodicalId":49587,"journal":{"name":"Russian Geology and Geophysics","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41533902","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

Further Insights into Deep Structure of Malmyzh, Pony-Muli, and Anadzhakan Ore Clusters in the Middle Amur Sedimentary Basin (Northern Sikhote-Alin Orogenic Belt) 中阿穆尔河沉积盆地(北锡霍特-阿林造山带)Malmyzh、Pony-Muli和Anadzhakan矿群深部构造的进一步认识

IF 1.1 4区地球科学

Russian Geology and Geophysics Pub Date : 2023-03-23 DOI: 10.2113/rgg20224515

A. Didenko, M. Nosyrev, G. Z. Gil’manova

{"title":"Further Insights into Deep Structure of Malmyzh, Pony-Muli, and Anadzhakan Ore Clusters in the Middle Amur Sedimentary Basin (Northern Sikhote-Alin Orogenic Belt)","authors":"A. Didenko, M. Nosyrev, G. Z. Gil’manova","doi":"10.2113/rgg20224515","DOIUrl":"https://doi.org/10.2113/rgg20224515","url":null,"abstract":"\u0000 —Magnetic and density depth models were calculated for the Malmyzh, Pony-Muli, and Anadzhakan porphyry-copper ore clusters emplaced in the northern part of the Middle Amur sedimentary basin. Based on analysis of anomalous magnetic field (magnetic model) data, a magmatogenic ring structure determining spatial patterns in localization of porphyry-copper mineralization in the Malmyzh and Pony-Muli ore clusters was established. It is shown that similar structures in the anomalous magnetic field are reported for many porphyry copper deposits. The area of the identified geologic structure can be considered as a high-potential region for detection of goldcopper-porphyry ore mineralization. Within the ring structure, perspective areas containing granitoid and diorite intrusions developed along its periphery and seated beneath the Middle Amur basin sedimentary cover can also be identified. Geophysical depth models are calculated for individual ore clusters with Au–Cu porphyry mineralization, to determine subsurface lithology and structures that may be useful for assessing regional ore potential and deducing areas for metallogenic exploration. The geophysical data-based deep subsurface model for the Malmyzh ore cluster is found to be consistent with the integrated petrological models developed by Richards and Sillitoe for giant Cuporphyry deposits.","PeriodicalId":49587,"journal":{"name":"Russian Geology and Geophysics","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44726152","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: 1