Tectonics and metallogeny of the junction zone between the North Asian craton and Pacific tectonic belt     

M. V. Goroshko  B. F. Shevchenko  V. A. Guryanov  G. Z. Gil’manova 《Russian Journal of Pacific Geology》2016,10(1):13-27

The tectonics and metallogeny of the junction zone between the North Asian craton and Pacific tectonic belt are considered. This zone is characterized by a wide variety of structures superposed on the metamorphic basement, which was formed in the course of a multistage geologic development of the craton from the Precambrian to the Cenozoic. They are related to the craton evolution and its response to the collision and subduction processes in the adjacent orogenic belt, processes in the passive and active continental margins, and plume magmatism. The geological structure of the region includes blocks of metamorphic rocks of the Aldan–Stanovoi shield, Paleoproterozoic volcanogenic troughs, Mesoproterozoic–Neoproterozoic and Early Paleozoic structures of the platform cover, Late Paleozoic volcanic and terrigenous troughs, structures of the Late Mesozoic Okhotsk–Chukotka volcanic belt of the active continental margin, and Late Cretaceous riftogenic structures formed in response to plume magmatism. In total, six metallogenic epochs are recognized in the development of ore mineralization: Archean–Early Paleoproterozoic, Late Paleoproterozoic, Mesoproterozoic, Neoproterozoic, Late Paleozoic, and Late Mesozoic. The minerageny of the junction zone between the craton and Pacific belt is highly diversified, being characterized by distinct evolution in time and space. Each development stage features its own set of mineral resources.  相似文献   

Investigations on physical properties and ablation processes of snow cover during the spring snowmelt period in the headwater region of the Irtysh River,Chinese Altai Mountains   总被引：1，自引：0，他引：1  

Wei Zhang  Yongping Shen  Ninglian Wang  Jianqiao He  An’an Chen  Jian Zhou 《Environmental Earth Sciences》2016,75(3):199

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Isotopic signatures for the assessment of snow water resources in the Moroccan high Atlas mountains: contribution to surface and groundwater recharge     

Angoran Baudelaire N’da  Lhoussaine Bouchaou  Barbara Reichert  Lahoucine Hanich  Yassine Ait Brahim  Abdelghani Chehbouni  El Hassane Beraaouz  Jean-Luc Michelot 《Environmental Earth Sciences》2016,75(9):755

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Impacts of anthropogenic activities on weathering and carbon fluxes: a case study in the Xijiang River basin,southwest China   总被引：1，自引：0，他引：1  

Shi Yu  Shiyi He  Ping’an Sun  Junbing Pu  Jie Huang  Huixian Luo  Yongshan Li  Rui Li  Yaqiong Yuan 《Environmental Earth Sciences》2016,75(7):589

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Sedimentology of the Baluti Formation in the Galley Derash,Amadiya, North Iraq: insight on carbonate turbidite facies and their depositional environmental     

Sa’ad Zeki Abdul-Kader Al-Mashaikie  Suhad Kalaf Abdul-Razzak  Madhat Eliwie Naser 《Arabian Journal of Geosciences》2016,9(19):723

The Baluti Formation is exposed succession of the Rhaetian age (Upper Triassic). These strata are interpreted herein for the first time to redeposit in a deep marine setting (distally steepened carbonate ramp/medial to distal slope) on the northwestern margin of the Neo-Tethys. The Galley Derash section is apparently continuous with no evidence for either subaerial exposure or submarine erosion. The absence of erosional scours in the study area confirms emplacement of these strata below both fair-weather and storm wave base. Event beds, particularly those resulting from sediment gravity flows, dominate the Rhaetian interval. The Upper Rhaetian strata are primarily assigned to the Galley Derash Valley. It records an upward transition from moderate-scale, olistolith-bearing debris flow deposits (debrite) to medium-/thin-bedded turbidites remobilized as sediment slumps/slides. The succession is dominated by medium- to thin-bedded calcareous turbidites and hemipelagic suspension deposits. Very low fossil assemblages, particularly stromatolite fragments, and planktonic bivalves occur within some intervals in the section. Rapid and relatively continuous sedimentation is attested to by the thickness of the section, the abundance of calcareous turbidites, and the thin nature of the intercalated hemipelagic beds. Low content of badly preserved fossils and evidence of continuous and rapid sedimentation refer to alteration by tectonic disturbances or diagenesis. This makes the Baluti Beds as a supplementary section for the Rhaetian successions in Iraq.  相似文献   

Pharmacokinetics and acetylation of sulfamethoxazole in turbot <Emphasis Type="Italic">Scophthalmus maximus</Emphasis> after intravascular administration     

常志强  柳飞  连春盎  翟倩倩  李健 《中国海洋湖沼学报》2016,34(4):789-794

The pharmacokinetic profiles and sulfamethoxazole (SMX) acetylation process in turbot reared at 18°C were investigated. Either SMX (parent drug) or its acetylized metabolite, N₄-acetylsulfamethoxazole (AcSMX), was administered intravascularly to turbot at a dosage of 50 mg/kg BW. Serum concentrations of the parent drug and its metabolite were both measured by HPLC, and the changes in concentration over time were analyzed in two- and non-compartment models because SMX treatment produced multiple peaks. The results demonstrated that the elimination half-life of the parent drugs, SMX and AcSMX, were 159.2 and 5.9 h, respectively. The apparent volume of distribution was 0.2 and 0.8 L/kg, and the clearance was 0.038 and 0.222 L/(h·kg), for SMX and AcSMX, respectively. SMX acetylation in turbot was 2.8%, and the deacetylation of AcSMX was 0.2%. These findings may be useful in optimizing SMX dosage regimens in turbot aquaculture.  相似文献   

A brief review of the interaction between tectonic, climatic and surface processes over multiple temporal and spatial scales     

Jing Liu Zeng  Jinyu Zhang  Yukui Ge  Wei Wang  Linsen Zeng  Gen Li  Xu Lin 《《地质学报》英文版》2018,92(Z1):151-151

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First Find of Ga-Bearing Minerals in Ores of Ural Massive Sulfide Deposits     

N. P. Safina  N. R. Ayupova  E. V. Belogub  V. V. Maslennikov  I. A. Blinov  I. G. Zhukov  D. A. Artem’ev 《Doklady Earth Sciences》2018,480(2):746-749

Gallium-containing chlorite, mica, and magnetite (up to 14, 13, and 5–7 wt % of Ga) along with Ga hydroxides (oxyhydroxides?) were found for the first time in massive sulfide deposit in the Urals. The minerals identified within the cement of chalcopyrite–sphalerite breccias of the Shemur copper–zinc–massive sulfide deposit (Northern Urals) are associated with Ga-enriched sphalerite, chalcopyrite, and, less commonly, pyrite (33–364, 67–363, and 4–230 g/t, respectively).  相似文献   

Faults and Source Parameters of Earthquakes in the Baikal Rift Zone: Dip Angles of Fault Planes     

V. M. Dem’yanovich  A. V. Klyuchevskii 《Doklady Earth Sciences》2018,479(2):433-438

Analysis of gentle, intermediate, and steep dip angles of fault planes in earthquake sources of the Baikal region is carried out with the slips in seismic sources being taken into account. The areas where normal faulting slips at steep, intermediate, and gentle angles took place are distinguished, and this can be interpreted as transformation of a steep dip to gentle one. It is found that the increase in energy class is accompanied by the number of earthquakes with steep dip angles, whereas the proportion of earthquakes with intermediate angles decreases, and the fraction of earthquakes with gentle angles remains quasi-stable and small.  相似文献   

<Superscript>230</Superscript>Th/U Chronology and Geochemistry of Irinovskoe Hydrothermal Field (Mid-Atlantic Ridge)     

V. Yu. Kuznetsov  E. V. Tabuns  G. A. Cherkashev  V. E. Bel’tenev  F. E. Maksimov  K. A. Kuksa  L. I. Lazareva  S. B. Levchenkoa  I. E. Zherebtsov 《Doklady Earth Sciences》2018,478(1):26-30

The results of ²³⁰Th/U dating and mineralogical–geochemical studies of sulfide ores from the Irinovskoe hydrothermal field and the Severo-Zapadnoe ore occurrence (Mid-Atlantic Ridge) are presented. Sulfides are represented primarily by copper–sulfide ores with 12–30% Cu content; sulfur- and zinc-sulfide ores are distributed less frequently. The analysis of a change in the composition of sulfides over time has made it possible to identify three stages of formation. Each stage assumes that mineral associations are changed from high-temperature (sulfur and copper sulfide) to medium temperature (Zn–Cu and Zn-sulfide) sulfide ores. The whole age range of formation of the hydrothermal deposits falls within the time interval of about 58000–8000 for the Irinovskoe field and 69000–11000 years ago for the Severo-Zapadnoe ore occurrence.  相似文献