从白沙井到大围山     

童潜明  ;陈建军图 《湖南地质》2009,(7):90-91

20世纪70年代，有一些国内的冰川地质研究专家，曾在长沙白沙井以及浏阳河人湘江口处，发现过冰期砾石，并确定它们来自于湘江或者其支流，但找不到砾石的来源。  相似文献   

Outburst mechanism of Yindapu Glacial Lake in Tibet     

ZHUANG Shuyu  LI Guangjie  CHEN Guoyu  SHU Youfeng College of Construction Engineering  Jilin University  Changchun  China 《东北亚地学研究》2009,(4):200-203

At present, the mechanism research on glacial lake outburst mainly focuses on the ice quake and ice landslide, etc. To some glacial lakes, the seepage deformation is the dominant factor in outburst process. Taking the Yindapu Glacial Lake in Tibet as an example, using SEEP/W module of FEM software （ GEO-STUDIO）, the authors analyzed seepage stability of terminal moraine ridge dam. The leading role of seepage deformation in some glacial lake outburst mechanism is proposed and proved.  相似文献   

Quaternary of Norden     

Barbara Wohlfarth Svante Bjoerck Svend Funder Michael Houmark-Nielsen Olafurlngolfsson Juha-Pekka Lunkka Jan Mangerud Matti Saarnisto Tore Vorren 《《幕》》2008,31(1):73-81

The Nordic countries have experienced multiple glaciations and intervening interglacials during the last ca. 2.5-3 million years. Although evidence from Greenland and Iceland shows that ice sheets started to expand some time before 3 Ma, little is known about the glaciations and intervening interglacials older than the last Glacial Maximum due to repeated phases of glacial erosion and reworking. The extensive Saalian glaciation （c. 140 ka BP） contributed to high sea levels in Greenland and in the Baltic area during the early part of the last interglacial （Eemian）. Temperatures were about 5 ℃ higher during the Eemian than they are today and the Greenland ice sheet was reduced to about half of its present size, causing globally higher sea levels than we have today. Ice extent in Fennoscandia was restricted during early Weichselian stadials, but middle Weichselian ice advances in Scandinavia reached as far as Denmark. During the Last Glacial Maximum, large ice sheets were present in all Nordic countries and coalesced with neighboring ice sheets. Deglaciation commenced around 17-15 ka BP in most areas and was promoted by rapidly rising global sea level and glacial isostasy. The Younger Dryas cold event（c. 12.6-11.5 ka BP） is seen as a short-term re-advance, still-stand or fluctuation of land-based ice sheet margins. Around 7-9 ka BP ice sheets had disappeared or had attained their present size. While uplift is still going on in some regions, others are subject to submergence. The different stages of development of the Baltic Sea are an example of how the intricare interplay between glacial eustasy and isostasy influences sedimentation, basin size and drainage patterns.  相似文献   

年保玉则:高原冰川发育的"万卷书"     

祁万强 《青海国土经略》2008,(1):47-48

[开栏寄语]沧海桑田、斗转星移。40多亿年地球的演变,给高原大陆留下了一幅幅动人的地质地貌画卷。青海省国土资源厅精心组织筹划,在这些具有特殊的地质科学意义的地方,申请建立了5个国家级地质公园,为保护我省珍贵的地质遗迹资源,推动旅游名省建设,起到了积极的推动作用。打开这部地史教科书,稀有的自然属性、典型的地质遗迹、独特的高原景观等让人叹为观止。  相似文献   

克氏原鳌虾LDH同工酶的组织特异性研究     

母昌考  张引  戴余军  黄孝湘  徐东生  吕帮玉 《海洋湖沼通报》2008,(3)

以克氏原螯虾为材料,采用聚丙烯酰胺凝胶电泳方法,分析了肌肉、眼球、肝胰腺和心脏4种组织和器官中乳酸脱氢酶(LDH)同工酶的表达情况.结果发现,眼球中出现Ldh-5和Ldh-6 2条酶带,肌肉中出现Ldh-1、Ldh-2、Ldh-3、Ldh-4、Ldh-5共5条酶带,肝胰腺中只出现Ldh-6 1条酶带,心脏中出现Ldh-3和Ldh-5共2条带.在这些检测到的酶带中,肌肉中Ldh-5活性最强,染色最深.实验结果表明,不同组织中LDH的同工酶的表达存在差异,表现出明显的组织特异性.  相似文献   

Distribution of debris flows in Glacier National Park,Montana, U.S.A.     

Forrest D. Wilkerson  Ginger L. Schmid 《山地科学学报》2008,5(4):318-326

The spectacular scenery of Glacier National Park is the result of glacial erosion as well as post-glacial mass wasting processes. Debris flow magnitude and frequency have been established through extensive fieldwork across seven separate drainage basins in the eastern portion of the park. This paper summarizes the investigation of the hypotheses that debris flow distribution in the Glacier National Park, east of the Continental Divide is （a） not random; and Co） concentrated adjacent to the Continental Divide. The location of 2317 debris flows were identified and mapped from sixty-three 1-m resolution Digital Orthophoto Quarter Quadrangles and their spatial distribution was then analyzed using ArcView Spatial Analyst GIS software. The GIS analysis showed that the debris flows are not randomly distributed nor are they concentrated directly adjacent to the Divide. While the Continental Divide provides orographic enhancement of precipitation directly adjacent to the Divide, the debris flows are not concentrated there due to a lack of available weathered regolith. The most recent Little Ice Age glaciation removed the debris directly adjacent to the Divide, and without an adequate debris supply, these steep slopes experience few debris flows. Both abundant water and an adequate debris supply are necessary to initiate slope failure, resulting in a clustering of debris flows at the break in slope where valley walls contact talus slopes. A variety of summer storm and antecedent moisture conditions initiate slope failures in the Glacier National Park, with no distinct meteorological threshold. With over two million visitorsevery year, and millions of dollars of park infrastructure at risk, identifying the hazard of debris flows is essential to future park management plans.  相似文献   

基于ALOS/PALSAR雷达干涉数据的中国西部山谷冰川冰流运动规律研究   总被引：5，自引：1，他引：4  

周建民  李震  李新武 《测绘学报》2009,38(4)

中国西部山谷冰川相对于南极和格陵兰的冰川来说,一般规模较小,冰川周围地形变化大,冰流运动复杂,容易导致冰川表面的完全失相干,从而很难提取出山谷冰川的冰流速度.为了削弱常规干涉测量中时间和空间失相干问题对山谷冰川冰面运动速度提取的影响,采用2007-12-10和2008-01-25的一对时间间隔46 d的L波段ALOS/PALSAR雷达数据,利用两轨法差分干涉测量成功的获取了青藏高原冬克玛底冰川表面的冰流运动速度,并将所得结果与该地区利用1996年C波段的ERS tandem数据获取的结果进行了对比验证.研究表明对于中国西部无人区的山谷冰川来说,雷达差分干涉测量技术是获取其冰流运动规律的有效手段,另外,相同时间间隔的L波段SAR数据比C波段SAR数据在提取冰流运动信息方面更具优势.  相似文献   

电视台日落光违规警车留“余地”公安局长要求取消“马赛克”     

《河南国土资源》2009,(5)

近日，贵州黔东南电视台曝光一警车违规时，在车牌号上打了“马赛克”，黔东南州公安局长温贵钦知道后要求把“马赛克”取消，让曝光更彻底。此事经报道后引起强烈社会反响。对此，温贵钦局长在接受采访时表示，媒体监督可以让我们做得更好。  相似文献   

A Direct Erosion Evidence of Quaternary Glaciation-Chatter Marks Found in Mt.Lushan, Shandong Province, East of China     

Lü Hongbo  XU Xingyong  YI Liang  LI Ping 《地质学报》2012,86(3)

本文首次报道了在山东鲁山南坡山谷发现混合岩表面的颤痕.颤痕是冰川底部携带的岩石碎块在下伏基岩表面刮凿而形成的一系列弧形裂隙,颤痕的弧形突出方向与冰川运动方向一致,而裂隙也是向下游方向深入基岩内部,其中突出的中间部位裂隙最深,向两端逐渐变浅直至消失.作者探讨了颤痕的形成机理,认为:颤痕相当于主剪切面上的伴生构造——R剪切面,在剖面上看就是一系列雁列式排列的R面,它不仅是冰川在基岩上运动留下的重要证据,而且还能指示冰体的运动方向.除了颤痕之外,在鲁山山麓还分布着大量的冰碛地貌:巨漂砾、冰碛堤等,在鲁山山脊上还见有典型的壶穴、冲刷槽等冰川融水侵蚀标志.这些标志与颤痕一起构成了强大的证据群,揭示了中国东部曾经发育过第四纪冰川的历史.中国东部是否发育过第四纪冰川?地学界已经争论了80多年,而颤痕的发现为进一步肯定中国东部存在第四纪冰川活动提供了最直接的证据.  相似文献   

屈库勒克东Ⅰ号金矿金赋存状态研究     

郭利  任燕  师兵  罗耀鸿 《新疆地质》2012,30(Z1):31-33

2010年新发现的屈库勒克东Ⅰ号金矿位于新疆东昆仑地区洒阳沟-屈库勒克一带,为低温热液型金矿.通过对屈库勒克东Ⅰ号金矿金的赋存状态研究,为可选性试验提供了制定工艺流程的基础资料.该矿区金主要为独立金矿物—含银自然金,以粒间金和裂隙金为主,粒度属中细微粒嵌布,形态以海绵状(蜂窝状)、板片状、枝杈状为主,成色为800‰.  相似文献