华南下寒武统黑色岩系中的热水成因硅质岩   总被引：17，自引：2，他引：17  

李胜荣  高振敏 《矿物学报》1996,16(4):416-422

华南下寒武统黑色岩系Ｎｉ－Ｍｏ－ＰＧＥ序列富硫化物层上，下均出现在区域上延伸不甚稳定的硅质岩，过去对其成因未作研究。该硅质岩刘岫峰（１９９４）的化学成因，生物成因和火山成因硅质岩氧化物（ＳｉＯ２－Ａｌ２Ｏ３，ＳｉＯ２－ＭｇＯ，ＳｉＯ２－Ｋ２Ｏ＋Ｎａ２Ｏ）判别图解上多落在化学成因区和火山成因区，在Ｗｏｎｄｅｒ的热水成因和正常水成因硅质岩ＳｉＯ２－Ａｌ２Ｏ３判别图解上，多落在热水因区，该硅质岩稀土总量  相似文献   

四川盆地某地富矿卤水水文地球化学特征及其成因资源意义   总被引：2，自引：0，他引：2       下载免费PDF全文

林耀庭  颜仰基  吴应林 《沉积与特提斯地质》1996,16(4):12-22

四川盆地某地富矿卤水以深层卤水形式赋存于地下４０００余米深的中三叠统雷口权组四段（Ｔ＿２ｌ￣４）盐系的碳酸盐岩储层中。富矿卤水与海水各浓缩阶段相比，其中Ｋ￣＋含量异常高，构成世界罕见的液态钾盐资源；Ｂｒ￣－、Ｉ￣－、Ｂ￣（３＋）、Ｌｉ￣＋等有用组分也远远超过综合利用工业品位，为优质化工原料水。富矿卤水为沉积变质和钾盐溶滤的复合成因，具有资源及固液态钾盐找矿的指示意义。本文为四川某地固液态找钾提供了有价值的线索。  相似文献   

Significance of cyst fragments of Artemia sp. recovered from a 27,000 year old core taken under the Great Salt Lake, Utah, USA     

James S. Clegg  Susan A. Jackson 《International Journal of Salt Lake Research》1997,6(3):207-216

We present electron microscopic observations on fragments of encysted embryos of the crustacean,Artemia sp., recovered from a 27,000 year-old core section taken under the Great Salt Lake (GSL), Utah. The significance of these results comes from a consideration of the geological history of the GSL and the extraordinary properties and abundance ofArtemia cysts at this site. We make the case that this unique system, and probably other salt lakes as well, provides novel opportunities for the study of “ancient DNA” and related matters. The analysis provides the major focus of this paper, which we hope will stimulate interest in this aspect of salt lake research.  相似文献   

The measurement of reactive silicate in saline-hypersaline lakes: examples of the problem     

J.K. Toxey  D.A. Meese  K.A. Welch  W.B. Lyons 《International Journal of Salt Lake Research》1997,6(1):17-23

The analysis of reactive silicate or H₄SiO₄ in saline lake waters using the silicomolybdic acid method developed by Mullin and Riley (1955) suffers from a rather severe salt interference. Our data show that the interference occurs in waters where both chloride and sulfate are the major anions. The interference leads to lower than actual values (by as much as 50 per cent). Until the chemical mechanism of the interference is quantitatively understood, dilution with deionized water appears to be the best approach to obtaining reliable data. This may limit the technique's usage in waters of high TDS, and low reactive silicate.  相似文献   

青海察尔汗盐湖采卤试验区固体钾矿的应用探析          下载免费PDF全文

刘振敏 《盐湖研究》1997,5(2):51-56

青海察尔汗盐湖采卤试验区中固体钾矿储量很大，固体钾矿与液体钾矿在静态条件下存在着一定的平衡关系，但单独开采价值不大．应考虑在开采液体钾矿的同时，我钻孔的不同部位从下至上轮流抽卤，使整个钾矿层中的固体钾矿转化到液相中来，则能充分利用其资源。  相似文献   

定常态渠道法采集地下卤水过程的一个简化的数学模型及其适定性          下载免费PDF全文

李海龙 《盐湖研究》1995,3(3):70-73

定常态渠道法采集地下卤水［１］的过程可由一类拟线性椭圆型方程的定解问题来描述，该定解问题在区域内部的曲线（集卤渠）上满足等值面边界条件。在适当假设下该定解问题可简化为求一线性定解问题的非负解。本文给出了该非负解存在唯一的充分条件。  相似文献   

海水蒸发轨迹线及其应用   总被引：1，自引：0，他引：1       下载免费PDF全文

周训  李慈君 《地球科学》1995,20(4):410-414

利用海水蒸发实验资料，在双对数图上，可以建立Ｃｌ＾－、Ｎ＾＋、Ｍｇ＾２＋、ＳＯ４＾２＋、Ｋ＾＋、Ｃａ＾２＋、ＨＣＯ３＾－、ｓＲ＾２＋、Ｂ＾３＋、Ｌｉ＾＋、Ｒｂ＾＋、Ｃｓ＾＋、Ｉ＾＋含量及矿化度与Ｂｒ＾－含量的关系曲线，称为海水蒸发轨迹线。它们可以和来帮助判断沉积盆地地下卤水的起源。分析沉积盆地蒸发岩卤水在后来的成岩环境中是否发生过成岩反应。  相似文献   

四川盆地卤水同位素组成及氘过量参数演化规律   总被引：4，自引：0，他引：4  

尹观  倪师军  高志友  施泽明  闫秋实 《矿物岩石》2008,28(2):56-62

运用岩石地球化原理对四川盆地卤水的同位素及氘过量参数进行分析,结果发现其具有明显的分布规律特征,盆地内以中三叠世为界同位素的显示出海、陆两大体系,海相沉积含卤层卤水中氢同位素组成均低于海水,而氧同位素则高于海水.卤水(主体)源于海水,不同时期海水的蒸发程度有所差异.由震旦系舍卤层卤水分布区向上,经寒武系、二叠系茅口组至三叠系嘉陵江组、雷口坡组,卤水的δD值随时代变新而相对富重同位素.陆相沉积含卤层卤水,源于大气降水,同位素组成落在大气降水线附近.海、陆过渡相含卤层(上三叠系须家河组)卤水,同位素组成落在海相沉积含卤层卤水与大气降水端员之间,系大气降水和蒸发海水的混合.盆地内不同时代的含卤层,卤水的氘过量参数(d值)有明显随含卤层时代变老逐步降低的趋势.三叠系雷口坡组-嘉陵江组、二叠系茅口组、寒武系及震旦系含卤层均系碳酸盐地层,水/岩作用十分强烈,同时显示出卤水的氘过量参数的变化是时间的函数.所有含卤层,凡是分布于盆地周边或处在断裂构造发育或经过长期开采卤资源的卤井,明显受到大气降水渗漏补给的影响,它们的氘过量参数(d)都有不同程度的升高,升高的程度取决于现代大气降水混入的数量.三叠系不同组含卤层的卤水,卤水d值的变化与平面分布和含卤层的埋深有一定的关联,含卤层埋深愈深,卤水的氘过量参数(d)值就愈低.  相似文献   

An Investigation of the Role of Social Dynamics in Conversion to Sustainable Integrated Mangrove‐Shrimp Farming in Ben Tre Province,Vietnam     

《Singapore journal of tropical geography》2018,39(3):421-437

In the coastal area of the Vietnamese Mekong Delta, much of the mangrove forest has been cut to make space for expansion of industry and aquaculture. Export‐oriented shrimp farming is a particularly fast‐growing business. Nonetheless, the importance of tropical mangrove forest ecosystems for coastal protection and marine biodiversity is widely recognized. The Vietnamese government, supported by non‐governmental organizations and donors, has sought to restore mangrove forest. To this end, the government has promoted mixed or integrated mangrove‐shrimp systems in which farmers maintain at least 40 per cent of their area under mangrove cover. Since 2012, mangrove reforestation, care and protection has benefited from local authority stimulus as well. Multiple studies have examined the condition of the mangrove forest in Ben Tre and other coastal provinces of the Mekong Delta. However, no research has investigated the role of social dynamics in farmers’ willingness to shift to, or maintain, integrated mangrove‐shrimp systems. Specifically, the influence of information, group dynamics and social learning on farmer decision‐making is poorly understood and, indeed, hardly investigated in Vietnam. This article reports on a study of social processes in three communes in Binh Dai District, Ben Tre Province, Vietnam. We conducted 42 semi‐structured interviews (with 34 farmers and eight local officials) and used secondary data. Our preliminary findings indicate that social dynamics in these communes were issue‐driven and played an important role in farmers’ decisions to adopt, or convert to, the integrated mangrove‐shrimp farming system. Television, radio, the internet, books, neighbours and training courses all had some influence in farmer decision‐making processes. However, our findings suggest that the accessibility, usefulness, relevance and approach of these communication methods must be improved if they are to adequately inform and support local farmers.  相似文献   

柴达木盆地盐湖卤水层给水度分布变化特征   总被引：2，自引：1，他引：1  

赵全升  胡舒娅  冯娟  张建伟 《地理科学》2017,37(1):148-153

选择柴达木盆地马海盐湖作为研究对象,在研究区布置给水度采样点11处,采样深度1.61~148.5 m,采集给水度样品75件。结合研究区以往37处采样点的72个测试数据,共计取得48处采样点145个测试数据。根据给水度实测数据,采用数理统计方法分析了柴达木盆地马海盐湖卤水层给水度分布变化。其主要特征表现为：① 给水度在水平方向上表现出较大的差异性,卤水层W_Ⅰ至W_Ⅴ的给水度分别介于0~0.263 5、0.009 4~0.209 9、0~0.277 8、0.006 2~0.135 9、0~0.107 7。在采样点MHK-022~MHK-026处,各卤水层给水度值较小,均小于0.06。在盐湖东北部,各卤水层给水度值较大,均大于0.08。② 给水度在垂直方向上受地层静压力的影响随着深度的增加而减小,上部卤水层W_Ⅰ的给水度均值为0.105,下部卤水层W_Ⅴ的给水度均值已降至0.038 7,不足卤水层W_Ⅰ给水度均值的40%。③ 给水度在垂直方向上还表现出旋回性的变化特征,这种沉积旋回的出现可能是对成盐期间气候波动的反映。  相似文献