冈底斯-喜马拉雅碰撞造山带前陆盆地系统及构造演化   总被引：2，自引：0，他引：2       下载免费PDF全文

丁林  蔡福龙  张清海  张利云  许强  杨迪  刘德亮  钟大赉 《地质科学》2009,44(4):1289-1311

碰撞带前陆盆地的建立是大陆碰撞的直接标志和随后造山带构造变形的忠实记录。本文对欧亚板块与印度板块碰撞前后发育在拉萨地块上的冈底斯弧背前陆盆地,同碰撞产生的雅鲁藏布江周缘前陆盆地,以及碰撞后陆内变形产生的喜马拉雅前陆盆地的沉积地层演化以及碎屑锆石物源特征等进行了系统分析,结合前人及我们近些年的研究成果,认为冈底斯岛弧北侧发育一个典型的弧背前陆盆地系统而不是以前普遍接受的伸展盆地。除传统认为的喜马拉雅前陆盆地系统外,在碰撞造山带中还发育一个雅鲁藏布江前陆盆地系统,它是欧亚板块与印度板块碰撞以后,欧亚板块加载到印度被动大陆边缘产生的典型周缘前陆盆地。上述2个造山带前陆盆地系统的识别,大大提高了对新特提斯洋俯冲、碰撞过程的认识。造山带前陆盆地证据指示,新特提斯洋至少于140 Ma以前就已开始俯冲, 110 Ma俯冲速度开始提高,在65 Ma前后印度大陆与欧亚大陆发生碰撞,喜马拉雅山于40 Ma开始隆升,其剥蚀物质大量堆积在喜马拉雅前陆盆地中。  相似文献   

藏东南超镁铁质岩墙及其地质意义   总被引：1，自引：1，他引：0       下载免费PDF全文

徐晓霞  丁林  许强  蔡福龙  张清海  张利云  来庆洲 《地质科学》2009,44(3):1012-1024

青藏高原东南部出露有大量近东西向展布的(超)镁铁质岩墙,锆石U?Pb年龄聚集在145～130 Ma之间。矿物学及岩石学结果显示：哲古错地区的亚碱性超镁铁苦橄质岩石源于150～180 km深处, 5～6 GPa下石榴石二辉橄榄岩地幔高比率的部分熔融; 碱性超镁铁质岩石源于石榴石-尖晶石二辉橄榄岩转换带,是低比率部分熔融的产物; 镁铁质岩石的岩浆在演化过程中遭受了低压下结晶分离作用的改造,不能代表原始岩浆的成份。藏东南(超)镁铁质岩石是不同深度地幔物质不同比率部分熔融的产物,亚碱性超镁铁苦橄质岩墙的出现指示了晚侏罗-早白垩印度板块北缘存在的高比率部分熔融的岩浆活动事件,暗示了地幔柱的存在和影响。  相似文献   

万星食品有限公司（栾城）饮用天然矿泉水水质评价     

田景秋  徐海振  张福隆 《华北地质矿产杂志》1995,10(4):541-544

河北万星食品有限公司（栾城）矿泉水，是第四系中上更新统松散岩类孔隙水，属深层承压水。经勘察评价，通过省级、国家级评审鉴定为含锶、偏硅酸的重碳酸钙·镁饮用天然矿泉水。１９９４年已建厂投产，所生产的“绣帝”饮用天然矿泉水，市场上供不应求，获得了良好的经济效益。  相似文献   

一种利用BDS/INS的杆塔姿态测量算法     

杨鸿珍  周启平  贺琛  魏永  傅宁  吉福龙 《测绘地理信息》2021,46(3):21-24

基于姿态信息是状态监测的关键参数这一特征,提出一种北斗卫星导航系统(BeiDou navigation satellite sys-tem,BDS)和惯性导航系统(inertial navigation system,INS)融合的杆塔姿态测量算法.由惯性传感器解算输出姿态信息得出基线向量搜索范围,提高了整周模糊度的求解成功率,并将BDS输出的姿态信息作为观测量,对INS解算出的姿态信息进行校正.经实例验证,该算法能有效解决卫星失锁带来的整周模糊度求解难的问题,并能进一步提高测姿精度.  相似文献   

60Co、137Cs在几种海洋生物中浓集问题的初步研究   总被引：3，自引：0，他引：3  

蔡福龙  吴晋平  陈其焕  杨嘉东  李平雨  何进金  林笔水 《海洋学报》1980,2(2):81-93

本文对核电站的主要废物60Co、137Cs在几种海洋生物中的浓集和若干有关的问题进行了初步研究.  相似文献   

若干南极环境样品的放射性   总被引：2，自引：0，他引：2  

蔡福龙  陈英 《台湾海峡》1992,11(1):79-83

本文观测比较了第六次南极考察采集的样品和190年采集的中国近海样品的放射性。结果表明,南极海洋沉积物的天然核素、~(137)Cs与中国近海沉积物一样均处于正常的波动范围,并有明显的沉积现象;南大洋表层海水的总β放射性比中国近海海水的少17%～52%;南极地衣对总β放射性的浓集系数达1.3×10~3～2.3×10~3,茎、果实是浓集放射性的关键器官,对~(137)Cs的浓集量达17.5Bq/kg(干),为中国近海海洋植物的8～14倍。  相似文献   

The behaviour of methionine in the model marine habitat     

Cai Fulong  Chen Ying  Huang Lingyi  Lin Rongsheng 《海洋学报(英文版)》1988,7(4):602-606

The behaviour of free methionine in the artificial marine habitat and the characteristic of absorption by clam were studied by trace method. The results showed that more than 70% of free methionine was utilized by marine organisms. The percentage of concentration methionine in suspended matter, Platymonas, sediment and clam was 11.4%, 24%, 7.8% and 34% respectively. The main path of absorption was viscera, seconded by mantle and gill. It was transferred to muscle after 24 h. The direct absorption of methionine from sea water by clam was more important and faster than that from food.  相似文献   

雅鲁藏布江缝合带西段仲巴地区俯冲—增生过程          下载免费PDF全文

郭旭东  丁林  蔡福龙  王厚起  岳雅慧 《地质科学》2019,54(4):1031-1047

雅鲁藏布江缝合带是新特提斯洋俯冲消亡的残余,记录了新特提斯洋打开—闭合的全过程。本文以雅鲁藏布江缝合带西段仲巴地区南侧的纳久混杂岩为研究对象,进行了详细的放射虫年代学,砂岩碎屑锆石U-Pb同位素年代学以及碎屑组分统计研究。我们的数据表明,纳久混杂岩中硅质岩含有大量保存较好的放射虫化石,包含Pseudodictyomitra carpatica带典型分子,根据放射虫时代组合确定其时代为早Barremian阶;混杂岩中砂岩岩块主要为岩屑砂岩,不同样品碎屑锆石得出的最大沉积年龄介于95～73 Ma之间。碎屑锆石U-Pb年龄源区分析表明,碎屑物质来自北侧的冈底斯岩浆弧和拉萨地体。纳久混杂岩南侧的砂岩沉积时代为早白垩世,碎屑锆石U-Pb年龄源区表明具有典型的特提斯喜马拉雅特征。我们的数据表明,纳久混杂岩基质时代为早白垩世,砂岩岩块时代为晚白垩世,与北侧的早白垩世蛇绿岩共同组成了白垩纪的增生楔,随着印度与欧亚大陆的碰撞仰冲到特提斯喜马拉雅之上。  相似文献   

Effects of AO and Pacific SSTA on severe droughts in Luanhe River basin,China     

Li  Jianzhu  Lei  Yuming  Liu  Xueyang  Mao  Huihui  Chen  Fulong  Engel  Bernard A. 《Natural Hazards》2017,87(2):1251-1258

Natural Hazards - In the (re)insurance industry, the risk from natural hazards such as earthquakes or floods is quantified by models for natural catastrophes, also called NatCat models. One...  相似文献   

Geothermal energy exploitation from depleted high-temperature gas reservoirs by recycling CO2:The superiority and existing problems     

Guodong Cui  Shaoran Ren  Bin Dou  Fulong Ning 《地学前缘(英文版)》2021,12(6):428-443

CO2 can be used as an alternative injectant to exploit geothermal energy from depleted high-temperature gas res-ervoirs due to its high mobility and unique thermal properties.However,there has been a lack of systematic anal-ysis on the heat mining mechanism and performance of CO2,as well as the problems that may occur during geothermal energy exploitation at specific gas reservoir conditions.In this paper,a base numerical simulation model of a typical depleted high-temperature gas reservoir was established to simulate the geothermal energy exploitation processes via recycling CO2 and water,with a view to investigate whether and/or at which condi-tions CO2 is more suitable than water for geothermal energy exploitation.The problems that may occur during the CO2-based geothermal energy exploitation were also analyzed along with proposed feasible solutions.The re-sults indicate that,for a depleted low-permeability gas reservoir with dimensions of 1000 m × 500 m × 50 m and temperature of 150℃using a single injection-production well group for 40 years of operation,the heat mining rate of C02 can be up to 3.8 MW at a circulation flow rate of 18 kg s-1 due to its high mobility along with the flow path in the gas reservoir,while the heat mining rate of water is only about 2 MW due to limitations on the injectivity and mobility.The reservoir physical property and injection-production scheme have some effects on the heat mining rate,but CO2 always has better performance than water at most reservoir and operation condi-tions,even under a high water saturation.The main problems for CO2 circulation are wellbore corrosion and salt precipitation that can occur when the reservoir has high water saturation and high salinity,in which serious salt precipitation can reduce formation permeability and result in a decline of CO2 heat mining rate(e.g.up to 24％reduction).It is proposed to apply a low-salinity water slug before CO2 injection to reduce the damage caused by salt precipitation.For high-permeability gas reservoirs with high water saturation and high salinity,the supe-riority of CO2 as a heat transmission fluid becomes obscure and water injection is recommended.  相似文献