乌鲁木齐旅游业与旅游资源开发   总被引：11，自引：8，他引：11  

阎顺  张春明  仇家琪  史家莉 《干旱区地理》2001,24(1):1-8

发展乌鲁木齐的旅游业要以资源为基础、市场为导向，重点开发博格达峰冰川公园景区、南山西景区、南山东景区、亚洲大陆中心景区、水磨沟景区、天山一号冰川景区、达坂城景区、月亮台子景区。以博格达峰冰川公园、亚洲大陆中心、南山二个滑雪场开发为先导，重点规划设计，重点投资建设。完善已有的南山东、西两个景区建设，使旅游业产生新的经济动力。同时，发挥乌鲁木齐市的枢纽和纽带作用，促进新疆旅游业的全面发展。  相似文献   

Response of geomorphic and geological processes to insufficient and ample sediment supply along the upper continental slope in the north-western South China Sea     

Hongjun Chen  Wenhuan Zhan  Shiguo Wu 《Journal of Earth System Science》2016,125(8):1635-1655

We document upper slope sedimentary process and strata on the passive margin of the north-western South China Sea (SCS) using multibeam bathymetry and high-resolution seismic data. The upper slope can be divided into two segments based on geomorphology, strata, and sediment supply. (1) The east segment is characterised by deep incised canyons and gullies, and slope failure. Submarine canyons with both U- and V-shaped morphology (13–28 km long × 2–4 km wide) are oriented NNE–SSW or NNW–SSE and are approximately perpendicular to the slope. Erosion is dominant, with escarpments, slumps, and several mass transport deposits (MTDs). Shelf-margin clinoforms show strongly upward vertical aggradation with time and are strongly aggradational in style. Since 5.5 Ma, the shelf break line migrated southwards and then retreated to its present position. The segment is classified as erosion-dominated due to insufficient sediment supply. (2) The west segment has a smooth surface, gentle gradient, and a strongly progradational style, with MTDs triggered by high sedimentation rates. Shelf-margin clinoforms display a combination of progradational and aggradational stacking patterns. The shelf break line migrated southwards with time. The segment is classified as deposition-dominated, resulting from plentiful sediment supply. Depositional models have been constructed for each segment: a constant shelf break model with insufficient sediment supply in the east, and a migration shelf break model with plenty sediment supply in the west. This case study contributes to the understanding of the upper slope sedimentary process and stratigraphic style under different sediment supply conditions.  相似文献   

库车盆地白垩系碎屑白云母物源区示踪与构造意义     

喻顺  陈文  孙敬博  尹继元  张彦  刘新宇  袁霞  马勋 《地质学报》2016,90(8):1874-1885

沉积盆地碎屑岩记录了相邻造山带构造演化及隆升剥蚀的重要信息。本文对库车盆地白垩系砂岩中的白云母进行了电子探针及~(40)Ar/~(39)Ar定年分析,并与天山造山带的数据对比研究表明:库车盆地白垩系砂岩中白云母为多硅白云母,硅原子数小于西南天山蓝片岩及榴辉岩中的多硅白云母,形成时的压力低于目前保留在西南天山蓝片岩中多硅白云母;白垩系砂岩多硅白云母~(40)Ar/~(39)Ar年龄为396.6 Ma,与在低温高压变质带中获得的多硅白云母~(40)Ar/~(39)Ar年龄419~310Ma一致,表明了在白垩纪西南天山低温高压变质岩带已抬升至地表遭受剥蚀,为库车盆地提供大量的物质,也表明了在白垩纪西南天山低温高压变质岩带高度(海拔)高于其南部的哈尔克山,而现今天山地貌形态显示低温高压变质岩海拔低于哈尔克山,这可能是由于新生代天山地区差异隆升剥蚀引起的。  相似文献   

西准噶尔北部早二叠世石英正长斑岩的地球化学特征及意义     

尹继元  陈文  喻顺  孙敬博  张斌  杨莉  袁霞  张岩 《地质学报》2016,90(9):2355-2364

朱鲁木特石英正长斑岩出露于西准噶尔北部。地球化学研究结果显示,它们的SiO2含量在74.5%~77.6%之间,显示高的K2O(4.60%~5.58%)、全碱(8.14%~9.61%)含量和高的K2O/Na2O比值(1.25~1.38),属于高钾钙碱性岩系列。铝饱和指数(A/CNK)=1.04~1.18,为过铝质岩石系列。稀土元素总量在128×10-6~236×10-6之间。它们显示了轻稀土富集[(La/Yb)N=6.0~10.4],重稀土相对平坦[(Gd/Yb)N=0.96~1.12],强烈的负Eu异常(Eu/Eu*=0.23~0.26)为特征。微量元素显示亏损Nb、Ta、P、Ti等高强场元素,富集Rb、K、U和Th等大离子亲石元素和La、Nd和Zr等元素。岩浆源区可能经历了斜长石,磷灰石,钛铁矿等矿物的分离结晶作用。石英正长斑岩具有正的εNd(t)和εHf(t),年轻的t2DM(Nd)(474~572 Ma)和t2DM(Hf)(357~931Ma)模式年龄,可能是古生代新生地壳物质的部分熔融的产物。它们具有较高的锆石饱和温度(834~865℃),与西准噶尔北部的A型花岗岩几乎同时形成,表明西准噶尔地区在早二叠世处于一种拉张高温的环境。  相似文献   

COⅠ条形码辅助分析雷州半岛红树林区鱼类的物种多样性   总被引：1，自引：0，他引：1  

张顺  廖健  柏琴  陈冲  郭昱嵩  刘楚吾  王中铎 《海洋与湖沼》2016,47(3):663-672

于2014年3月至2015年7月从我国雷州半岛红树林区采集成鱼和幼鱼样本共1720尾,在依据Fish Base等鱼类形态分类系统进行鉴定的基础上,利用COⅠ条形码技术确认存在94个物种,分属11目33科72属。结果表明:红树林区鱼类种群极其丰富,其中鲈形目(Perciformes)鱼类物种最多,为59种,占总物种数的62.77%,其次是鲱形目(Clupeiformes)和鲻形目(Mugiliformes),分别占6.38%和5.32%。鲈形目中又以虾虎鱼科(Gobiidae)为优势类群,含29种(占30.85%)。按生态类群分:海洋洄游鱼类最多,占物种总数的32.98%,其次为海洋偶见鱼类、两侧洄游鱼类,分别占22.34%、17.02%,以虾虎鱼类物种为主的红树林定居鱼类约占11%。本研究表明红树林生态系统是许多海水、淡水和洄游性鱼类在特定生活阶段的重要栖息地和育幼场所。另外,COⅠ条形码技术可有效快捷地鉴定出红树林海域的鱼类。  相似文献   

Hammer's Impact Force on Pile and Pile's Penetration     

Ji-Cheng Wang  Jianlin Yu  Ma Shiguo  Xiaonan Gong 《Marine Georesources & Geotechnology》2016,34(5):409-419

Methods of energy and momentum conservation, vibration theories, and model tests are employed to research the impact force of a hammer on a pile and the pile's penetration. An analytical formula of impact force of the hammer on pile is obtained. A comparison of results from the three methods finds that the analytical formula proposed by this article conforms well to practical situations. Research results show that if the hammer's impact energy remains unchanged, penetration increases with the increase of hammer weight and cushion stiffness. In addition, the impact force received by the pile head degrades with the increase of hammer weight, but increases with the increase of cushion stiffness. Impact time decreases with the increase of cushion stiffness, but increases with the increase of hammer weight. The model test shows that, when compared with a cotton cloth cushion, an elastic cushion's advantages lie in that the relatively small pile head impact force can achieve significant pile penetration. The cotton cloth is gradually compacted with the increase of blow counts; hence, the impact force the pile head receives tends to increase gradually.  相似文献   

Site selection for offshore facilities     

Adrian F. Richards  Shun C. Ling  Ben C. Gerwick Jr. 《Ocean Engineering》1976,3(4)

A simplified input-output process is used to describe the end-members of two methods of site selection: one in which the structure controls the site and the other in which the site controls the structure. Most site selection processes are combinations of these two methods. Factors ranging from atmospheric, oceanic, and seafloor conditions to marine biota, constructional, and political-demographic-geographic are tabulated to show the variety that may be considered in the site selection process. The bathymetric, geological-geophysical, and geotechnical components of siting surveys are reviewed, together with location control. The state-of-the-art of siting all kinds of structures on the continental margins and deepsea floor beyond the continental margin could be improved in almost all areas to increase the reliability of operations at sea and to decrease costs.  相似文献   

白垩纪羌塘地体西南缘的陆-陆碰撞:来自班怒带西段的花岗岩约束     

付顺  赵应权  王进军  余瑜  朱迎堂  傅星劼 《地学前缘》2022,29(2):416-430

羌塘地体西南缘布木错—雄巴日—羌多—赛登地区分布着大量呈岩株或岩枝状的中酸性-基性侵入岩,其岩石地球化学特点是低SiO₂(67.99%~73.32%)、高Al₂O₃(12.82%~15.02%),属于过铝质花岗岩,里特曼指数(2.09~2.63)σ<3.3,属钙碱性花岗岩类;稀土元素显示为轻稀土较强富集和重稀土强亏损的特征,岩浆结晶分异程度较高。岩石地球化学特征和稀有元素特征图解指示花岗岩构造环境有一定的差异性,以I型为主,其形成及侵位应与古特提斯洋的闭合、新特提斯洋的扩张有关,属同碰撞型造山花岗岩。通过对该区多个花岗岩体锆石LA-ICPMS 测定,测得其形成年代为116~107 Ma,与早白垩世晚期羌塘地体南缘的陆-陆碰撞作用时间相吻合。  相似文献   

成岩作用对泥页岩储集性能的影响: 以东营凹陷古近系沙四上亚段为例^*          下载免费PDF全文

余志云  陈世悦  张顺  刘鑫金  唐东  鄢继华 《古地理学报》2022,24(4):771-784

陆相页岩油储集层孔隙结构特征及储集能力受泥页岩在埋藏过程中经历的复杂成岩改造影响,纵向上表现出显著的差异性,但相关研究仍不够深入。以渤海湾盆地东营凹陷古近系沙河街组沙四上亚段典型陆相富有机质泥页岩为研究对象,基于岩心观察描述、岩石薄片鉴定、扫描电镜等多尺度观察手段,结合X射线衍射分析、同位素地球化学分析、物性分析及能谱分析等测试资料,开展泥页岩成岩作用特征及其控储差异研究。研究结果表明: (1)研究区可识别出7种成岩作用类型,其中,建设性成岩作用以方解石重结晶、黏土矿物转化及白云石化作用为主; 沙四上亚段整体处于中成岩A阶段。(2)方解石重结晶、黏土矿物转化及白云石化作用在垂向上表现出显著的差异性演化特征,重结晶成因的亮晶方解石主要发育于纯上3小层与纯上2小层,黏土矿物转化所形成的晶间中—高孔区主要发育于纯上2小层; 研究区主要发育2种类型的白云石,其中,泥晶白云石主要发育于纯上3小层,微晶铁白云石主要发育于纯上1、2小层。(3)方解石重结晶和黏土矿物转化的协同使得纯上2小层产生了大量微孔,同时适量的铁白云石可作为骨架矿物支撑孔隙,有利于中深层孔隙的保存,是该小层成为优质储集层的关键。  相似文献   

Load transfer and performance evaluation of piled beam-supported embankments     

Wang  Tengfei  Ma  Hongfei  Liu  Kaiwen  Luo  Qiang  Xiao  Shiguo 《Acta Geotechnica》2022,17(9):4145-4171

Acta Geotechnica - A ground modification technique with rigid columns and ground beams for supporting an embankment over multilayered soft soils is introduced and investigated. A fully coupled...  相似文献