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Gas hydrate research has significant importance for securing world energy resources, and has the potential to produce considerable economic benefits. Previous studies have shown that the South China Sea is an area that harbors gas hydrates. However, there is a lack of systematic investigations and understanding on the distribution of gas hydrate throughout the region. In this paper, we applied mineral resource quantitative assessment techniques to forecast and estimate the potential distribution of gas hydrate resources in the northern South China Sea. However, current hydrate samples from the South China Sea are too few to produce models of occurrences. Thus, according to similarity and contrast principles of mineral outputs, we can use a similar hydrate-mining environment with sufficient gas hydrate data as a testing ground for modeling northern South China Sea gas hydrate conditions. We selected the Gulf of Mexico, which has extensively studied gas hydrates, to develop predictive models of gas hydrate distributions, and to test errors in the model. Then, we compared the existing northern South China Sea hydrate-mining data with the Gulf of Mexico characteristics, and collated the relevant data into the model. Subsequently, we applied the model to the northern South China Sea to obtain the potential gas hydrate distribution of the area, and to identify significant exploration targets. Finally, we evaluated the reliability of the predicted results. The south seabed area of Taiwan Bank is recommended as a priority exploration target. The Zhujiang Mouth, Southeast Hainan, and Southwest Taiwan Basins, including the South Bijia Basin, also are recommended as exploration target areas. In addition, the method in this paper can provide a useful predictive approach for gas hydrate resource assessment, which gives a scientific basis for construction and implementation of long-term planning for gas hydrate exploration and general exploitation of the seabed of China. 相似文献
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南黄海表层沉积物物质来源的逐步判别分析 总被引:2,自引:0,他引:2
1998年6月,获取南黄海表层沉积物样品61个,黄河、长江中、上游细粒泛滥平原沉积物样品24个.在对后者17个地球化学指标测试的基础上,利用逐步判别分析方法,筛选出7个指标(Ti、Cu、K2O、Zn、Na2O、A12O3和CaO),做为识别黄河、长江物质组成的有效参数,并构造黄河、长江两个物源端元的判别函数Y1和Y2.利用判别函数,分别计算出南黄海61个表层沉积物的函数值,进而对其物源属性进行识别.判别结果表明,南黄海表层沉积物按物源属性分为三大区A-长江物质优势区;B-黄河物质优势区;C-长江、黄河物质混合区. 相似文献
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基于地球化学参数的海底沉积物端元定量判识方法研究:I.分离沉积物?… 总被引:3,自引:1,他引:3
系统介绍“分离沉积物端元的最优斜交成分因子算法”,此算法包括主成分分析、因子得分成分化和最优斜交变换三部分。此算法可获得成分化的非负的斜交因子得分,弥补了Q型因子分析仅能用于样品间的相互关系及样品的分类研究,而不能胜任海底沉积物端元物质分离工作之不足。方法适合于沉积物物源端元定量分离工作。将此方法应用于冲绳海槽海底表层样,成功地仞了出长江陆源物质。此方法同样适合于诸如岩石、水体、土壤污染等混合过程 相似文献
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基于国内外研究成果对西太平洋岛弧-弧后盆地热液活动的分布规律、扩张速率、水深以及热液硫化物的矿物组成与金属品位等特征进行探讨。西太平洋岛弧-弧后盆地热液硫化物区以活动型热液区为主,受扩张速率的影响明显主要分布在20~60 mm/a地区;水深分布规律主要受所处构造单元的水深特征控制,而非由热液硫化物区的形成特征所决定;研究区内的热液产物主要为富Zn-Cu、富Ba-Zn以及富Fe-Cu型硫化物;热液硫化物中冲绳海槽具有最高的Ag、Pb含量,劳海盆具有最高的Zn含量,马努斯海盆和伊豆-小笠原-马里亚纳海槽具有较高的Au含量,北斐济海盆具有最高的Cu含量。本研究将进一步为西太平洋岛弧-弧后盆地地区热液硫化物资源的勘探与潜在资源量的估算提供参考。 相似文献
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冲绳海槽中段火山岩系Sr和Nd同位素地球化学特征及其地质意义 总被引:6,自引:0,他引:6
冲绳海槽中段广泛发育基性至酸性火山岩岩石系列 .各类火山岩的平均Sr同位素87Sr/86Sr分别为 0 70 4749,0 70 5 0 6 2 ,0 70 8771,0 70 4840和 0 72 0 30 1;平均Nd同位素比值143 Nd/144 Nd分别为 0 5 12 82 0 ,0 5 12 6 73,0 5 12 413,0 5 12 72 9和0 5 12 0 34 .Sr,Nd同位素比值完全落在MORB岩浆和流纹质岩浆二端员混合的理论双曲线上 .推断冲绳海槽中段不同类型的火山岩是在海槽地壳形成和演化的不同阶段 ,MORB岩浆同化了早已存在的壳源物质而产生的流纹质部分熔体以不同比例与MORB混合而后喷发的产物 ,揭示了冲绳海槽正从大陆裂谷进入海底扩张阶段 相似文献
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在典型的实验海区,使用双频测深仪和箱式取样器,对海底进行同步探测,获取双频测深仪不同底质类型数据。比较了式取样器海底底质样品,归纳出海底基岩、沙、粘土的双频测深仪水深数据和双频测深仪海底模拟记录图象特征,该特征可为双频测深仪识别海底底质类型提供先验认识。 相似文献
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