大陆深部地壳物质成分识别方法综述     

侯青叶  张本仁  赵志丹  路凤香  刘东盛  曹铁宁 《地质学报》2010,84(6):865-872

本文系统总结了大陆深部地壳物质成分识别研究方法和元素丰度合理性检验的方法,以期为大陆深部地壳物质成分探测提供技术方法体系。深部地壳物质成分识别的主要方法有:①因构造运动抬升出露到地表的中下地壳剖面;②地表出露的高级变质地体;③产于火山岩中的深部地壳捕掳体,如麻粒岩捕掳体;④地球物理测深资料与深部岩石物理性质的高温高压实验测定结果之间的拟合和⑤壳源岩浆岩源区地球化学示踪。元素丰度合理性检验的方法主要有地表热流和元素比值法。  相似文献   

四川盆地川东南地区“源—盖”匹配关系研究   总被引：4，自引：0，他引：4  

袁玉松  孙冬胜  周雁  李双建  汪新伟  张荣强  沃玉进  郑和荣 《地质论评》2010,56(6):831-837

采用重建烃源岩生烃史("源")和泥质盖层排替压力演化史("盖")的方法,研究源—盖动态匹配关系,以确定泥质盖层封闭动态有效性。针对川东南地区丁山1井泥质盖层封闭性的研究结果表明:川东南地区寒武系泥质盖层不仅封闭性能形成时间早(早于震旦系烃源岩生烃时间),而且排替压力大(最大排替压力高达26MPa),封闭能力强,具备封闭超高压气藏的能力,"源—盖"匹配关系好,对下伏烃源岩具备有效封盖作用;志留系泥质盖层虽然现今排替压力较大,但封闭性形成时间晚于下伏寒武系烃源岩生烃时间,"源—盖"匹配关系不理想,有效封闭性较差;二叠系和三叠系泥质盖层封闭性形成时间分别早于志留系和二叠系烃源岩的生烃时间,具备有效封闭能力,且最大排替压力都大于10MPa,可封闭高压气藏。  相似文献   

煤层底板承压含水体上带压开采研究     

叶东生  杜飞虎 《中国煤炭地质》2010,(11):38-41

渭北煤田5、10号煤层底板以下的奥陶系灰岩强含水层,水头压力大,对采煤的威胁严重,历史上曾经发生多次底板突水事故,造成重大人员伤亡。以澄合矿区为例,研究了带压开采防治水的技术路线,提出了底板注浆加固的防治水方法,并成功应用于董家河煤矿,不仅安全开采了5号煤层,而且保护了渭北地区岩溶水的统一水位标高,使区内各岩溶大泉流量稳定、黄河湿地生态安全得以保证,促进了生物多样性和工农业用水安全,为渭北及华北型煤田底板承压水体上带压安全采煤找到了技术途径。  相似文献   

极浅海域波浪滑翔器跨介质通信实验          下载免费PDF全文

杨义军  姚俊辉  陈东升  童峰  兰维瑶 《数字海洋与水下攻防》2022,5(4):307-312

面向海洋立体信息感知中长期环境监测、目标探测、区域预警、跨介质信息中继等领域对极浅海域空海信息链路的需求,考虑极浅海域信道恶劣、潮流复杂、环境噪声严重等困难,采用直接序列扩频结合差分二进制相移键控(DS-DBPSK)的水声调制解调技术,以波浪滑翔器为平台进行水声通信、无线系统设计与整合,构建面向极浅海域水下信息支持的波浪滑翔机跨介质通信链路,并在平均深度 12 m 的厦门港海域开展极浅海域跨介质通信实验,验证了所设计技术方案及系统的有效性。  相似文献   

山东栖霞杨家夼金矿地质特征及控矿条件分析          下载免费PDF全文

余普贤  肖翔  谢军民  赵亚斌  刘冬生  史宏江 《山东国土资源》2014,30(9)

杨家夼金矿产于粉子山群张格庄组、蓬莱群豹山口组地层中,从其控矿岩性及矿化特征来看应为类卡林型金矿床。地层主要以大理岩、透闪大理岩、透闪片岩、钙质板岩、千枚状板岩、黑云变粒岩、二云片岩为主。金矿主要赋存于岩性变化复杂的薄层状大理岩、透闪大理岩、板岩、透闪片岩中,除岩性控矿外,构造也具有明显的控矿性,当断裂构造切穿或与这些成矿有利岩性叠加时,金矿化更为明显,而岩性分界线或层间破碎带也是该类金矿的有利赋存部位。  相似文献   

The atmospheric circulation patterns influencing the frequency of spring sand-dust storms in the Tarim Basin     

HongJun Li  XinHua Yang  Yong Zhao  MinZhong Wang  Wen Huo 《寒旱区科学》2014,6(2):0168-0173

Using NCEP/NCAR reanalysis data and the sand-storm frequency data fi＇om 37 weather stations in the Tarim Basin for the period 1961-2009, the relationship between the frequency of spring sandstorms in the Tafim Basin and the associated atmospheric circu- lation pattems is analyzed in this study. We found significantly negative correlations between sandstorm frequency and the 500-hPa geopotential height over the Paris Basin and midwestem Mongolia, while there were positive correlations over the Ural River region. The rising of the 500-hPa geopotential height in midwestem Mongolia and its falling over the Ural region corre- spond to a weakening of the large-scale wave patterns in the Eurasian region, which directly causes the frequency of the sand-dust storms in the Tarim Basin to decline. Also, the abrupt decline in the spring sandstorm frequency in the Tarim Basin observed in the last half-century is associated with profound changes in the atmospheric circulation in these key regions. At the interannual scale, the strengthened cyclonic atmospheric circulation patterns in the western part of Mongolia and the anticyclonic patterns over the East European plains at 500-hPa geopotential height, are responsible for frequent sandstorm occurrences in the Tarim Basin.  相似文献   

Effects of salinity on embryonic development,survival, and growth of Crassostrea hongkongensis     

Zhongming Huo  Zhaoping Wang  Jian Liang  Yuehuan Zhang  Jianping Shen  Tuo Yao  Jiaqi Su  Ruihai Yu 《中国海洋大学学报(英文版)》2014,13(4):666-670

This study examined the effects of salinity on embryonic development, survival, and growth of the Hong Kong oyster Crassostrea hongkongensis. The embryos, larvae, and juveniles of C. hongkongensis were held in artificial seawater at three different salinities (low, 15; medium, 23; and high, 30) to determine the optimum hatchery and nursery conditions for mass production of the seeds. Results showed that the percentage production of straight-hinged larvae from fertilized eggs was significantly lower at the high salinity than at the low- and medium-salinities (P < 0.05). The survival rates of larvae and juveniles differed significantly among the three salinity trials, with the highest survival rate observed at the low salinity (P < 0.05). The shell height of larvae was significantly larger at the low salinity than at the high and medium salinities from days 9 to 15 (P < 0.05), whereas that of juveniles was significantly larger at the low salinity than at the high and medium salinities on day 70 (P < 0.05). These results indicate that the larvae and juveniles of C. hongkongensis are tolerant to a wide range of salinities (15 to 30), but show better growth and survival at relatively low salinities. Thus, it is recommended to use relatively low salinities in hatchery and nursery systems for improved yields of C. hongkongensis.  相似文献   

长江口及其邻近陆架区夏季网采浮游植物及其影响因素   总被引：3，自引：1，他引：2  

江志兵  曾江宁  李宏亮  周锋  陈全震  朱根海  张东声  严小军 《海洋学报》2014,36(6):112-123

2009年6、8月长江口及其邻近陆架区的网采样品中检出浮游植物9门395种(含223种硅藻与125种甲藻)。浮游植物丰度8月(3 077.15×104 cells/m3)显著高于6月(107.80×104 cells/m3)。随长江冲淡水势力增强,位于长江口的丰度高值区8月较6月更偏外侧。种类丰富度8月高于6月,但多样性和均匀度指数略低于6月。6月尖刺伪菱形藻和三角角藻占绝对优势,8月优势种主要有尖刺伪菱形藻、笔尖形根管藻和铁氏束毛藻。骨条藻虽非优势种,但在长江冲淡水区丰度较高。相似性分析和多维尺度分析表明,浮游植物群落组成时空差异显著。典范对应分析表明,温度和盐度是分别影响6、8月群落分布的首要因子。根据水动力和化学参数,该区浮游植物群落分布与环流变化和水团消长密切相关。  相似文献   

Responses of vegetation distribution to climate change in China   总被引：1，自引：1，他引：0  

Dongsheng Zhao  Shaohong Wu 《Theoretical and Applied Climatology》2014,117(1-2):15-28

Climate plays a crucial role in controlling vegetation distribution and climate change may therefore cause extended changes. A coupled biogeography and biogeochemistry model called BIOME4 was modified by redefining the bioclimatic limits of key plant function types on the basis of the regional vegetation–climate relationships in China. Compared to existing natural vegetation distribution, BIOME4 is proven more reliable in simulating the overall vegetation distribution in China. Possible changes in vegetation distribution were simulated under climate change scenarios by using the improved model. Simulation results suggest that regional climate change would result in dramatic changes in vegetation distribution. Climate change may increase the areas covered by tropical forests, warm-temperate forests, savannahs/dry woodlands and grasslands/dry shrublands, but decrease the areas occupied by temperate forests, boreal forests, deserts, dry tundra and tundra across China. Most vegetation in east China, specifically the boreal forests and the tropical forests, may shift their boundaries northwards. The tundra and dry tundra on the Tibetan Plateau may be progressively confined to higher elevation.  相似文献   

时空遥感云计算平台PIE-Engine Studio的研究与应用   总被引：1，自引：0，他引：1  

程伟  钱晓明  李世卫  马海波  刘东升  刘富乾  梁军龙  胡举 《遥感学报》2022,26(2):335-347

随着遥感大数据时代的到来,为快速处理和分析海量遥感数据,国内外涌现了众多遥感云计算平台,使得全球尺度、长时间序列遥感数据的快速分析和应用成为可能。本文在分析国内外遥感云计算平台现状的基础上,针对大数据时代国内缺少功能完备的遥感云计算平台,且国外遥感云计算平台对国产卫星数据支持不足等问题,基于容器云技术,构建了包含国产卫星数据且集数据、算力和技术于一体的时空遥感云计算平台PIE（Pixel Information Expert）-Engine Studio,实现了脚本驱动的遥感数据的按需获取以及海量数据的快速处理。采用Landsat 8数据,以生长季植被指数NDVI（Normalized Difference Vegetation Index）的计算为例,对比了本平台与GEE（Google Earth Engine）的数据处理能力。结果表明,由于计算资源的限制,本平台的计算和导出时间均比GEE稍长,但计算结果的空间分布一致,其中近68%的值均分布在（0.48,0.77）,且二者差值的95.33%集中在（-0.13,0.13）,结果较为可信。因此,本文构建的基于共享、开放的中国自主遥感云计算平台PIE-Engine Studio,可为地球科学领域的研究提供数据和算力支持,将有助于推进中国遥感云计算平台的发展进程,推动国产卫星数据在云计算平台上的应用。  相似文献