Strong Seismic Activity of the Terskey Ala-Too Range Adyrs,Northern Tien Shan,in the Holocene from Radiocarbon Analysis Data     

Korzhenkov  A. M.  Deev  E. V.  Korzhenkova  L. A.  Liu  Jiao  Mažeika  Y. V.  Rogozhin  E. A.  Strelnikov  A. A.  Turova  I. V.  Usmanova  M. T.  Fortuna  A. B. 《Izvestiya Physics of the Solid Earth》2022,58(2):243-266

Izvestiya, Physics of the Solid Earth - Abstract—We studied historical and paleoseismic deformations in the southern Issyk-Kul depression—on the territory of adyrs (piedmonts) of the...  相似文献   

Exploring the impact of spatial correlations of earthquake ground motions in the catastrophe modelling process: a case study for Italy     

Schiappapietra  E.  Stripajová  S.  Pažák  P.  Douglas  J.  Trendafiloski  G. 《Bulletin of Earthquake Engineering》2022,20(11):5747-5773

Bulletin of Earthquake Engineering - Catastrophe models are important tools to provide proper assessment and financial management of earthquake-related emergencies, which still create the largest...  相似文献   

Two-phase SPH modelling of a real debris avalanche and analysis of its impact on bottom drainage screens     

Tayyebi  Saeid M.  Pastor  Manuel  Stickle  Miguel M.  Yag&#;e  &#;ngel  Manzanal  Diego  Molinos  Miguel  Navas  Pedro 《Landslides》2022,19(2):421-435

Landslides - Rapid flow-like landslides, particularly debris flows and debris avalanches, cause significant economic damage and many victims worldwide every year. They are usually extremely fast...  相似文献   

Source component mixing controls the variability in Cu and Au endowment along the strike of the Eastern Andean Cordillera in Peru     

Thomas?AngererEmail authorView author&#;s OrcID profile  Anthony?I.?S.?Kemp  Steffen?G.?Hagemann  Walter?K.?Witt  Jo?o?O.?Santos  Christian?Schindler  Carlos?Villanes 《Contributions to Mineralogy and Petrology》2018,173(5):36

Mississippian arc magmatic suites of the Au-rich Pataz and Cu-dominated Montañitas regions in Peru reveal distinct modes of magmatic-hydrothermal petro- and metallogenesis. The distinction is remarkable due to their broad contemporaneity (336–322 Ma), arc-parallel position, and close distance (<?50 km) to each other. In both arc regions, petrography, geochemistry, and the tectonic setting of magmatic suites suggest a rapid switch from syn-collisional/compressional to post-collisional/extensional (with ‘A₂-type’ signature) emplacement regime. Rocks of the Au-rich Pataz region originate from mixed sources with a contribution from the mantle (εHf?>?0 and δ¹⁸O of ~?5.3‰) and assimilated old crust (variously low εHf and δ¹⁸O >?5.3‰). The ultimate source of Au in the mineralised Pataz batholith was oxidised (fO₂ at FMQ buffer; based on zircon trace chemistry) and alkali-, LILE- and HFSE-enriched, most likely represented by the metasomatised mantle. The syn-extensional emplacement of the relatively reduced (ΔFMQ?<?0), but unmineralised, A₂-type suite involved assimilation of reduced crust. Associated, reduced, magmatic-hydrothermal fluids infiltrated the Au-bearing batholith suite and effectively mobilised and transported and concentrated Au. In the Montañitas region, rocks are oxidised (ΔFMQ?>?0) and dominantly mantle derived without significant incorporation of crustal material. Samples from the Cu-mineralised suites indicate the additional contribution of a δ¹⁸O <?5.3‰ source, potentially melted layer-2 gabbro. In addition, the elevated whole-rock La/Yb and Sr/Y ratios are compatible with minor addition of slab-derived material, which may have enhanced Cu endowment in this region. Late-magmatic, oxidised fluids derived from the younger A₂-type suite controlled Cu mobilisation and concentration, while Au behaved largely refractory. In general terms, it is postulated that source mixing in continental arcs is a first-order control of contrasting Cu and Au endowment and that sequential intrusion processes facilitate late-magmatic-hydrothermal mobilisation and concentration of specific metal assemblages.  相似文献   

Content of the potentially harmful elements in soil around the major coal-fired power plant in Serbia: relation to soil characteristics,evaluation of spatial distribution and source apportionment     

Milan N. Tanić  Mirjana R. Ćujić  Boško A. Gajić  Marko Z. Daković  Snežana D. Dragović 《Environmental Earth Sciences》2018,77(1):28

The concentrations and spatial distribution of nine potentially harmful elements (PHEs), namely Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb and Zn, and their relation to soil properties were investigated in thirty soil profiles (0–50 cm depth) sampled around the largest Serbian coal-fired power plant (CFPP) “Nikola Tesla A.” Soil properties were determined following standard procedures, and total contents of PHEs were analyzed by atomic absorption spectrometer. Concentrations of Cd, Co, Fe, Mn, Pb and Zn were the highest in soil profiles sampled 1 km away from the CFPP, concentrations of Ni and Cu gradually increased up to 4 km, and the highest Cr concentrations were measured in samples taken 6 km away from the CFPP. The highest concentration of PHEs analyzed, except Mn, corresponded with predominant wind directions. Depth did not show significant impact on distribution of any PHEs investigated. Among soil properties, the total organic carbon showed the closest relationship with the PHEs. Data were processed by a principal component analysis which enabled distinguishing anthropogenic from natural influences on soil properties and PHE contents. Although the impact of CFPP operations is obvious, assets of principal component analysis did not allow clear distinction of CFPP’s contribution from parent material in enrichment of PHE contents in the soil in the study area.  相似文献   

Assessment of radiation exposure to human and non-human biota due to natural radionuclides in terrestrial environment of Belgrade,the capital of Serbia     

Jelena Petrović  Milan Đorđević  Ranko Dragović  Boško Gajić  Snežana Dragović 《Environmental Earth Sciences》2018,77(7):290

The main focus of this study was to assess radiation exposure to human and non-human biota due to natural radionuclides in soil of the Serbian capital. For the first time, ERICA tool was employed for calculation of gamma dose rates to non-human biota in this area. In analyzed soils, the mean values of ²²⁶Ra, ²³²Th and ⁴⁰K specific activities were found to be 35, 43 and 490 Bq kg^?1, respectively. The distribution of analyzed natural radionuclides in soils was discussed in respect to its statistically significant correlations with sand, silt, clay, carbonates, cation exchange capacity and pH value. The annual outdoor effective dose rates to the population varied from 48 to 98 μSv, and the total dose rates to terrestrial biota, calculated by ERICA tool, varied from 9.84?×?10^?2 μGy h^?1 (for tree) to 5.54?×?10⁺⁰ μGy h^?1 (for lichen and bryophytes). The results obtained could serve as a baseline data for the assessment of possible anthropogenic enhancement of the total dose rate to human and non-human biota of the study area.  相似文献   

Geochemistry and zircon U–Pb geochronology constrains late cretaceous plagiogranite intrusions in Mersin ophiolite complex (southern Turkey).     

Nusret?NurluEmail authorView author&#;s OrcID profile  Sedat?Türkmen  G?k?e??im?ek  Aleksandr?S.?Stepanov 《Arabian Journal of Geosciences》2018,11(23):745

In this study, LA-ICP-MS U–Pb zircon dating were used to determine the age of the newly discovered plagiogranite suite intruding gabbro and volcanic units of Mersin ophiolites from the Inner Tauride Belt. Obtained U–Pb zircon ages from the plagiogranite yielded crystallization ages of 93.0?±?1.5 to 94.2?±?2.4 Ma (Turonian–Cenomanian) supporting the idea of Late Cretaceous active subduction factory in the Tauride Suture Zone. The plagiogranites are mainly granodioritic, and tonalitic in composition, and contain mafic microgranular enclaves (MME) ranging from 10 to 45 cm in size. The plagiogranites are geochemically defined by low K₂O (0.02–1.03 wt%) and TiO₂ (0.17–1.88 wt%) and comparatively high Na₂O (2.3–10.2 wt%) and SiO₂ (70–78 wt%) compositions together with depletion in Ti, Ta, and Nb. The tectonomagmatic discrimination diagrams, trace, and REE-normalized multi-element patterns indicate that the plagiogranites are distinctive calc-alkaline, I-type volcanic arc granites. Plagiogranites are furthermore characterized by the diffuse presence of isotropic pseudomorphic growth of secondary calcic-amphibole (edenite and actinolite) over a pristine not preserved Ca-inosilicate. Inverse geothermobarometry models indicate a secondary amphibole genesis at ca. 600 °C and 1.5–1.7 kbar, suggesting HT-metasomatism affecting the already intruded plagiogranites. While it is already accepted that Mersin ophiolite complex is generated in a supra-subduction zone, this study represents a new contribution on the evolution of the Mersin ophiolite during the Late Cretaceous Neotethys subduction and could shed light on the genesis of plagiogranites in arc-environments.  相似文献   

Fertility of Rare-Metal Peraluminous Granites and Formation Conditions of Tungsten Deposits     

L.?F.?Syritso  E.?V.?BadaninaEmail author  V.?S.?Abushkevich  E.?V.?Volkova  A.?V.?Terekhov 《Geology of Ore Deposits》2018,60(1):33-51

The tungsten distribution in rocks of the Kukulbei Complex in eastern Transbaikal region results in a high potential of rare-metal peraluminous granites (RPG) for W mineralization and displays a different behavior of W in Li–F and “standard” RPG. These subtypes differ in the behavior of W in melt, spatial localization of mineralization, and the timing of wolframite crystallization relative to the age of the parental granitic rocks. The significant of W concentration is assumed to be due to fractionation of the Li–F melt; however, wolframite mineralization in Li–F enriched granite is not typical in nature. The results of experiments and our calculations of W solubility in granitic melt show that wolframite hardly ever crystallizes directly from melt; it likely migrates in the fluid phase and is then removes from the magma chamber to the host rocks, where secondary concentration takes place in exocontact greisens and quartz–cassiterite–wolframite veins. At the same time, the isotopic age of accessory wolframite (139.5 ± 2.1 Ma) within the Orlovka massif of Li–F granite is close to the formation age of the massif (140.6 ± 2.9 Ma). A different W behavior is recorded in the RPG subtype with a low lithium and fluorine concentration, exemplified by the Spokoininsky massif. There is no significant W gain in the melt. All varieties of wolframite mineralization in the Spokoininsky massif are derived from greisens, veins, and pegmatoids yielding the same crystallization ages (139.5 ± 1.1 Ma), which are 0.9–1.8 Ma later (taking into account the mean-square weighted deviation) than the Spokoininsky granite formation (144.5 ± 1.4 Ma). Perhaps this period corresponds to the time of transition from the magmatic stage to hydrothermal alteration. Comparison of the isotope characteristics (Rb–Sr and Sm–Nd isotope systems) of rocks and the associated ore minerals (wolframite, cassiterite) from all examined deposits shows a depletion in ε_Nd values for ore minerals relative to the rock and the opposite behavior for the intial Sr isotope ratios. This may indicate the specific nature of ore matter, where the effect of the juvenile component is definitely expressed. Our geochronological results show that tantalum and tungsten mineralization took place within a narrow age interval, almost synchronously with the crystallization of associated granites. The coeval development of peraluminous magmatism enriched in lithophile rare elements and volatiles with ore complexes located in different structural settings and separated by a considerable distance from each other (up to 500 km) suggests a regional and deep-seated magma source. Rifting and increased thermal flux from the mantle, manifestations of which have been recorded during this period in the territory, may be a deep-seated process.  相似文献   

Multidisciplinary research of landslide at UNESCO site of Lower Hodruša mining water reservoir     

Martin Bednarik  René Putiška  Ivan Dostál  Rudolf Tornyai  Karel Šilhán  Filip Holzer  Karol Weis  Ivan Ružek 《Landslides》2018,15(6):1233-1251

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Pyrcz and Deutsch: Geostatistical Reservoir Modeling     

Jo Eidsvik 《Mathematical Geosciences》2015,47(4):497-499

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