兰坪盆地古近纪沉积相类型及沉积环境演化   总被引：1，自引：0，他引：1       下载免费PDF全文

朱志军  姜勇彪  郭福生  侯增谦  杨天南  薛传东 《岩石矿物学杂志》2011,30(3):409-418

通过对兰坪盆地野外露头及相关室内研究,分析了区内古近纪的沉积环境、层序特征、沉积相展布及其演化特征。认为古近纪主要发育冲积扇、河流、三角洲和湖泊环境。沉积建造为一个完整的盆地演化旋回:低位期,印度板块向欧亚板块的俯冲挤压造成兰坪走滑拉分盆地的形成,沉积了一套局限的湖盆相红色含膏盐细碎屑岩建造;湖扩期,挤压应力场转变为拉张应力场,湖盆扩大,大面积沉积了一套滨浅湖相紫红、砖红色砂泥岩互层沉积;湖缩期,受晚始新世喜马拉雅运动一幕的影响,应力场再次转变为强烈挤压,东西两侧造山带共同向盆地内推覆扩展,致使盆地范围明显缩小,仅在推覆体前缘形成一系列快速充填的小型山前陆相前陆盆地。层序古地理编图显示,蒸发岩发育于低位体系域,与低位期的沉积充填特点和气候有关,极具有找钾盐矿的前景。  相似文献   

Regional Distribution and Prospects of Potash in China   总被引：4，自引：0，他引：4  

ZHENG Mianping  an  ZHENG Mianping  YUAN Heran  LIU Xifang  CHEN Wenxi  LI Jinsuo 《《地质学报》英文版》2011,85(1):17-50

China was formed by amalgamation of several small continental blocks (cratons), micro, blocks and orogenic belts in different paleoclimatic settings. It may be correlated with other continental blocks but has its own specific characteristics; therefore the tectonic environments of China’s marine and continental saline basins and salt, and potash, forming environment have some specific characteristics: multiple phases of salt formation, difference in salt, forming ages, migration and concentration of salt, forming processes and diversity of component materials, as well as small sizes of marine saline basins and great changes of saline basins in the late stage and occurrence of abundant liquid mineral resources. The nature of the tectonic basement exerted a key controlling effect on the formation of potash basins. The stable tectonic region was favorable for potash concentration in a quasi, stable region, and quasi, and the quasi-stable region was favorable for salt concentration and potash formation in a local stable tectonic region. Most China’s major ancient saline basins occur in “quasi, cratons (continental block)”; especially all the marine saline basins occur in continental blocks with the Precambrian basement. These regions are the key ones for potash search. Most relatively large, scale soluble salt deposits are developed in relatively stable continental nuclei. According to the characteristics of the tectonic domains where China’s salt, forming basins are located, the North China, Yangtze and Tarim, Qaidam salt minerogenetic domains and the northern Qiangtang, western Yunnan salt minerogenetic belt may be distinguished. Their salt and potash prospects will be discussed separately.  相似文献   

滨里海盆地东缘中段盐构造变形特征     

余一欣  郑俊章  汤良杰  王燕锟  杨孝群 《世界地质》2011,30(3):368-374

利用地震剖面解释和构造编图,对滨里海盆地东缘中段下二叠统孔谷阶盐构造变形特征进行了分析。结果表明,孔谷阶含盐层系变形强烈,主要发育盐底辟、盐枕、盐滚、盐焊接、盐边凹陷和龟背构造等多种盐构造变形样式。不同盐构造规模差别较大,隆起幅度自东向西逐渐增大,平面展布具有明显的分带性。盐构造运动对周缘地层变形也产生了重要影响,形成了楔型褶皱地层,并导致盐间和盐上地层发育一些特征各异的断裂。盐构造运动受乌拉尔造山作用影响明显,强烈的盐构造活动主要发生在晚二叠世一三叠纪。  相似文献   

盐湖卤水锂资源及其开发进展   总被引：7，自引：0，他引：7  

高峰  郑绵平  乜贞  刘建华  宋彭生 《地球学报》2011,32(4):483-492

随着全球资源与环境问题的日益突出,锂资源的开发和利用受到人们的高度关注.由于盐湖卤水中含有丰富的锂资源,所以对其锂资源的开发利用具有重要意义.本文在全球盐湖卤水锂资源的分布及其水化学分类特征论述的基础上,对目前盐湖卤水锂资源的提取工艺进行了比较分类,对卤水锂资源的开发进展情况进行了综述.指出我国盐湖卤水锂资源的开发利用...  相似文献   

后赤潮过程中现场水样的三维荧光光谱特征分析     

吴永森  吴绍渊  李赟  李瑞香  殷月芬 《海洋与湖沼》2011,42(6):892-898

对发生在青岛近岸水域的后赤潮过程中赤潮藻密度、藻种进行鉴别的同时,对现场水样的三维荧光光谱进行了测量,获得了一套三维特征荧光数据。分析结果表明,1）当海水中生物密度达到或接近赤潮密度时,Ex最高峰值波长位于245nm,Em最高峰值波长在445nm,激发转折波长在260nm,荧光转折波长在245nm;2）在非赤潮区,Ex...  相似文献   

Anthropogenic impacts on the water and salt budgets of St Lucia estuarine lake in South Africa     

Robynne A. Lawrie  Derek D. Stretch 《Estuarine, Coastal and Shelf Science》2011

Lake St Lucia in South Africa is part of a UNESCO World Heritage site and a Ramsar wetland of international importance. Like many coastal wetlands worldwide, anthropogenic activities including catchment land-use changes, water diversions/abstractions, and manipulation of the mouth state have significantly affected its functioning over the past century. Questions concerning its sustainability have motivated a re-evaluation of management decisions made in the past and of options for the future. A model for the water and salt budgets has therefore been used to investigate “what if” scenarios in terms of past anthropogenic interventions. In particular, simulations allow us to evaluate the effects of diverting the Mfolozi river from St Lucia on the functioning of the system and on the occurrence of various water level/salinity states that drive the biological functioning of the ecosystem. In the past, when the St Lucia estuary and the Mfolozi river had a combined inlet, the mouth was predominantly open. The lake had relatively stable water levels but variable salinities that increased during dry conditions due to evaporative losses and saltwater inflows from the sea. If the mouth closed, the Mfolozi flow was diverted into the lake which reduced salinities and maintained or increased water levels. Simulations indicate that without a link to the Mfolozi the lake system would naturally have a mainly closed inlet with lower average salinities but more variable water levels. During dry conditions water levels would reduce and result in desiccation of large areas of the lake as has recently occurred. We conclude that the artificial separation of the St Lucia and Mfolozi inlets underpins the most significant impacts on the water & salt budget of the lake and that its reversal is key to the sustainability of the system.  相似文献   

天津近海潮汐特征分析   总被引：1，自引：0，他引：1  

李希彬  孙晓燕  王世福  叶风娟  李玉杰  李秀艳 《海洋通报(英文版)》2011,13(1):40-49

对塘沽海洋环境监测站从1950年-2008年,59年的潮汐资料进行调和分析,分析了其分潮调和常数的变化曲线,并利用FFT谱分析方法对其调和常数的变化周期和原因进行了分析;之后应用FFT谱分析方法对去除天文潮后的余水位进行分解,分析了近50多年来年平均余水位的多层次周期分布,进而利用最小二乘法进行线性分析,分析了天津近海...  相似文献   

北黄海表层沉积物中甲藻孢囊的分布特征   总被引：2，自引：0，他引：2  

石雅君  刘东艳  邵红兵  邸宝平  董志军  王玉珏 《海洋通报》2011,30(3):320-327

2009年和2010年采集北黄海15个站位的表层沉积物样品进行甲藻孢囊分析,共鉴定出甲藻孢囊28种(隶属13个属)和2种未定种,优势种为膝沟藻(Gonyaulax spp.)、塔马/链状亚历山大藻(Alexandriumcatenella/tamarense)和微小/相似亚历山大藻(Alexandrium minutu...  相似文献   

渤海湾天津近岸海域首次棕囊藻赤潮初探     

屠建波  张秋丰  徐玉山  胡延忠  石海明 《海洋通报》2011,30(3):334-337

利用2006年渤海湾天津近岸海域首次棕囊藻赤潮各发生区域动态应急监测资料,对其水体理化参数进行了分析.主要得出如下结论:(1)渤海湾天津近岸海域首次爆发的相对低温条件下棕囊藻赤潮虽然来势凶猛,但对区域生物并没有造成明显毒害影响,一定程度上佐证了低温条件下棕囊藻细胞数量积累迅速但合成毒素的数量却相对较少的实验室研究结论....  相似文献   

1003号台风“灿都”风暴潮特征分析与模拟     

张娟  冯伟忠  李广敏  许炜铭 《海洋通报》2011,30(4):367-370

根据粤西沿海4个海洋站潮位资料分析、讨论了“灿都”台风风暴潮特征:利用改进的Jelesnianski风场,并采用耦合天文潮模拟与非耦合天文潮两种方案,对1003号台风“灿都”进行模拟、分析,模拟结果显示:在改进的杰氏风场驱动下,两种预报结果误差都比较小,但耦合天文潮预报结果优于非耦合天文潮预报结果.  相似文献