The Irtysh shear zone (ISZ) of Altai region is the lineament structure of the collision suture type, where granites of Kalba complex and granodiorites of Zmeinogorsk complex are exposed to regional gneiss formation an...The Irtysh shear zone (ISZ) of Altai region is the lineament structure of the collision suture type, where granites of Kalba complex and granodiorites of Zmeinogorsk complex are exposed to regional gneiss formation and stress metamorphic alterations. This study is based on detailed structural observations at special grounds using optical and electron microscopy, and on the behavior analysis of isotopic systems from altered granitoids.Within the ISZ area we have established the continuous rows of granitoid stress metamorphism from initial recrystallization of protolite, its cataclasis and mechanical flaring up to complete recrystallization with alteration of mineral composition and formation of the streaky complexes of granite tectonites of blastomylonite and blastocataclasite types. The directed alteration of rocks has several impulse and is expressed by a change in morphology of mineral grains and their relations, magnification of deformation component in the rock structure, and formation of new mineral phases on the basis of initial ones without surface fluidization. At transformation of isotopic systems from granitoid, their feldspars, biotite and hornblende, we can observe “rejuvenation” of the rock substrate from 270-290 Ma for Kalba granitoids to 220-235 Ma for their tectonites, and for Rudny Altai granodiorites, their ages changes from 285-317 Ma to 232-257 Ma for their tectonites.展开更多
1 Introduction Increasing demand for uranium raw materials for the nuclear industry has stimulated interest in non-traditional sources,including hydromineral ones[Qin,2009].Those are saline lakes located in the uraniu...1 Introduction Increasing demand for uranium raw materials for the nuclear industry has stimulated interest in non-traditional sources,including hydromineral ones[Qin,2009].Those are saline lakes located in the uranium ore districts.Accumulation of uranium in such lakes results from the leaching of uranium from the rocks by surface and ground展开更多
In the Early Mesozoic period intercontinental movements of the Junggar and Tuva-Mongolian lithosphere terranes were accompanied by the deformation of the Paleozoic tectonic substrate and by the formation of a new tect...In the Early Mesozoic period intercontinental movements of the Junggar and Tuva-Mongolian lithosphere terranes were accompanied by the deformation of the Paleozoic tectonic substrate and by the formation of a new tectonic system of Inner Asia, the Altai collision belt. The qualitative change of the initial structure covered more than 30% ~35% of the region. and the zonal distribution of these new formations determined the belt configuration and inner peculiarities. Residual mosaic-block terranes of the Paleozoic substrate and specific collision systems are distinguished and described in this paper. The main elements of these structures are crumple zones (collision sutures). Analysis of the rock massif regional dynamometamorphism and the spatial distribution of stress-formations in Altai is the principal peculiarity of the method for recognizing the Early Mesozoic collision system. Tectonites of destruction zones (D-tectonites ) . cataclastic flow (C-tectonites ) and plastic flow (P-tectonites) are the members of these formations. Each kind of tectonites is specific for conditions of the initial substrate transformation during the collision and has its own indicator peculiarities. Isotopic dating of stress-formations in Altai gives 260~230 Ma.展开更多
采用阿勒泰地区7个气象站1961—2010年逐日平均气温资料，使用线性趋势分析、累积距平、t检验并基于Kriging插值法，分析近50年日平均气温稳定通过≥10℃的初日、终日、持续日数和积温的时空变化特征，揭示春玉米播种期及种植布局的变...采用阿勒泰地区7个气象站1961—2010年逐日平均气温资料，使用线性趋势分析、累积距平、t检验并基于Kriging插值法，分析近50年日平均气温稳定通过≥10℃的初日、终日、持续日数和积温的时空变化特征，揭示春玉米播种期及种植布局的变化规律。结果表明，阿勒泰地区近50年≥10℃积温呈现初日提前、终日推迟、持续日数延长、积温增加的现象，其倾向率分别为0．3、1．3、1．6 d·10a－1和57．1℃·10a－1，且突变年份均发生在20世纪90年代中期。各县市春玉米播种期提前3～8 d ，生长季延长6～11 d。突变前青河东部不能种植春玉米，晚熟品种不能种植或种植风险较大。随着气候不断变暖，春玉米不同熟性品种可种植区逐渐东扩，各县市春玉米在品种熟性上均发生了改变，表现为由不能种植到种植早熟、早熟向中（晚）熟、中晚熟向晚熟品种的变化。展开更多
文摘The Irtysh shear zone (ISZ) of Altai region is the lineament structure of the collision suture type, where granites of Kalba complex and granodiorites of Zmeinogorsk complex are exposed to regional gneiss formation and stress metamorphic alterations. This study is based on detailed structural observations at special grounds using optical and electron microscopy, and on the behavior analysis of isotopic systems from altered granitoids.Within the ISZ area we have established the continuous rows of granitoid stress metamorphism from initial recrystallization of protolite, its cataclasis and mechanical flaring up to complete recrystallization with alteration of mineral composition and formation of the streaky complexes of granite tectonites of blastomylonite and blastocataclasite types. The directed alteration of rocks has several impulse and is expressed by a change in morphology of mineral grains and their relations, magnification of deformation component in the rock structure, and formation of new mineral phases on the basis of initial ones without surface fluidization. At transformation of isotopic systems from granitoid, their feldspars, biotite and hornblende, we can observe “rejuvenation” of the rock substrate from 270-290 Ma for Kalba granitoids to 220-235 Ma for their tectonites, and for Rudny Altai granodiorites, their ages changes from 285-317 Ma to 232-257 Ma for their tectonites.
基金SB RAS Interdisciplinary Integration Projects 38 and 110RFBR Research Project 13-05-00556the Tomsk State University Program to improve competitiveness
文摘1 Introduction Increasing demand for uranium raw materials for the nuclear industry has stimulated interest in non-traditional sources,including hydromineral ones[Qin,2009].Those are saline lakes located in the uranium ore districts.Accumulation of uranium in such lakes results from the leaching of uranium from the rocks by surface and ground
文摘In the Early Mesozoic period intercontinental movements of the Junggar and Tuva-Mongolian lithosphere terranes were accompanied by the deformation of the Paleozoic tectonic substrate and by the formation of a new tectonic system of Inner Asia, the Altai collision belt. The qualitative change of the initial structure covered more than 30% ~35% of the region. and the zonal distribution of these new formations determined the belt configuration and inner peculiarities. Residual mosaic-block terranes of the Paleozoic substrate and specific collision systems are distinguished and described in this paper. The main elements of these structures are crumple zones (collision sutures). Analysis of the rock massif regional dynamometamorphism and the spatial distribution of stress-formations in Altai is the principal peculiarity of the method for recognizing the Early Mesozoic collision system. Tectonites of destruction zones (D-tectonites ) . cataclastic flow (C-tectonites ) and plastic flow (P-tectonites) are the members of these formations. Each kind of tectonites is specific for conditions of the initial substrate transformation during the collision and has its own indicator peculiarities. Isotopic dating of stress-formations in Altai gives 260~230 Ma.
文摘采用阿勒泰地区7个气象站1961—2010年逐日平均气温资料，使用线性趋势分析、累积距平、t检验并基于Kriging插值法，分析近50年日平均气温稳定通过≥10℃的初日、终日、持续日数和积温的时空变化特征，揭示春玉米播种期及种植布局的变化规律。结果表明，阿勒泰地区近50年≥10℃积温呈现初日提前、终日推迟、持续日数延长、积温增加的现象，其倾向率分别为0．3、1．3、1．6 d·10a－1和57．1℃·10a－1，且突变年份均发生在20世纪90年代中期。各县市春玉米播种期提前3～8 d ，生长季延长6～11 d。突变前青河东部不能种植春玉米，晚熟品种不能种植或种植风险较大。随着气候不断变暖，春玉米不同熟性品种可种植区逐渐东扩，各县市春玉米在品种熟性上均发生了改变，表现为由不能种植到种植早熟、早熟向中（晚）熟、中晚熟向晚熟品种的变化。
