Isotope Geochemistry of Granitoids in South China and Their Metallogeny

Abstract: On the basis of data of initial strontium ratios for over 300 plutons, neodymium isotopes for 240 plutons and oxygen isotopes for more than 200 plutons, the granites of South China are divided into six belts which are different from each other in petrology, geochemistry and mineralization. The similar Nd isotopic composition between the peraluminous granites and Proterozoic crust reveals that there is intermediate to felsic composition crust at mid-crustal depth throughout the South China interior. The six granitic belts mentioned above belong to different lithospheric plates with different composition basement. Differences in the extent and nature of interaction between mantle and crusts in different geodynamic setting and the different extent of differentiation of magma have all controlled the characteristics of the granites and their related mineralization.     

东海海域溶解氧垂直分布最大值的分析研究

本文讨论了１９８７年５～６月东海海域溶解氧垂直分布及其氧最大值分布特征。结果表明，春末在东海北部、中部的中层存在明显的溶解氧垂直分布最大值。氧最大值与冷水同存。本文对氧最大值及垂直结构与冷暖水入侵和温跃层关系进行了初步分析     

山东肥城煤田本溪组——太原组牙形刺

通过对山东肥城煤田本溪组和太原组牙形刺动物群的系统研究，共鉴定出牙形刺化石6属14种及部分未定种，根据牙形刺化石在地层中的分布和垂向变化规律自上而下建立了两个牙形刺组合：Ⅱ．Streptognathodus barskovi组合和Ⅰ．Streptognathodus parvus-Idiognothodus magnificus组合。通过与邻区及华北部分地区对比，本区本溪组和太原组中牙形刺动物群的地质时代应分别为晚石炭世晚期（组合Ⅰ）和早二叠世早期（组合Ⅱ），本区C—P界线应在四灰之底。     

麻山群孔兹岩系中的堇青片麻岩

黑龙江省东部麻山群中堇青片麻岩的主要矿物组合有石榴石＋夕线石＋堇青石＋石英＋钾长石＋黑云母；石榴石＋夕线石＋堇青石＋钾长石＋尖晶石；堇青石＋夕线石＋斜长石；柱晶石＋堇青石＋斜长石＋夕线石＋石榴石＋电气石；堇青石＋紫苏辉石＋石榴石＋斜长石＋黑云母＋石英。这些含堇青石组合是在麻粒岩相条件下已存石榴石＋夕线石＋石英矿物组合分解反应的产物，其形成压力（０．４５－０．５ＧＰａ＿比麻粒岩相“高峰”压力明显低，     

四川盆地下三叠统嘉陵江组主要成盐期岩相古地理特征

四川盆地下三叠统嘉陵江组是我国钾盐矿产勘查的重点区域和层位,对其的岩相古地理研究是钾盐研究的一项重要的基础地质工作。本文结合四川盆地古地理背景和古气候条件,通过野外剖面、岩心观察、薄片鉴定等方法,对研究区下三叠统嘉陵江组的沉积相进行了分析研究,共识别出潟湖、潟湖边缘坪和台内滩相三种沉积相类型,并进一步划分出多种微相。在此基础上,通过区域地层对比以及岩相古地理编图,重建了四川盆地下三叠统嘉陵江组岩相古地理演化。结合前人研究认为：四川盆地嘉陵江组整体上属于障壁碳酸盐岩台地沉积环境,自西向东从碳酸盐岩局限海相演化为蒸发台地相。盆地周边水下隆起的障壁作用和干旱炎热气候条件共同影响了嘉陵江组台地咸化的演化过程,海平面升降变化是控制沉积相发育和空间分布的重要因素。最后,基于本研究的资料,编制了嘉陵江组各成盐期的岩相古地理图。     

甘肃河西石羊河流域出山径流分析及来水预测

径流量是水资源规划、利用、管理、调度的重要依据。根据石羊河流域的实测径流资料统计分析得到：流域地表水资源量为15.52×10⁸ m³;流域各代表站出山径流的C_V值在0.15~0.35之间,年极值比在1.77~14.20之间,呈现出从西向东逐渐增大的空间分布特性。运用加法模型对石羊河流域径流量进行预测,结果表明未来4年内为丰水年。     

Tidal current and tidal energy changes imposed by a dynamic tidal power system in the Taiwan Strait,China

The Taiwan Strait has recently been proposed as a promising site for dynamic tidal power systems because of its shallow depth and strong tides. Dynamic tidal power is a new concept for extracting tidal potential energy in which a coast-perpendicular dike is used to create water head and generate electricity via turbines inserted in the dike. Before starting such a project, the potential power output and hydrodynamic impacts of the dike must be assessed. In this study, a two-dimensional numerical model based on the Delft3D-FLOW module is established to simulate tides in China. A dike module is developed to account for turbine processes and estimate power output by integrating a special algorithm into the model. The domain decomposition technique is used to divide the computational zone into two subdomains with grid refinement near the dike. The hydrodynamic processes predicted by the model, both with and without the proposed construction, are examined in detail, including tidal currents and tidal energy flux. The predicted time-averaged power yields with various opening ratios are presented. The results show that time-averaged power yield peaks at an 8% opening ratio. For semidiurnal tides, the flow velocity increases in front of the head of the dike and decreases on either side. For diurnal tides, these changes are complicated by the oblique incidence of tidal currents with respect to the dike as well as by bathymetric features. The dike itself blocks the propagation of tidal energy flux.     

近40年中国近海波浪数据库的建立及极值分析

采用TOMAWAC模型模拟近岸40年的波浪要素。波谱计算采用36个方向,模拟波周期范围为1.5～29 s,并对极值波况进行分析。统计了1979—2018年间有效波高的年极值,算得百年一遇的有效波高,发现百年一遇波高由北往南总体呈现增大趋势:渤海和黄海的百年一遇的波高不超过10 m;东海百年一遇的波高在15～22 m之间;南海北部百年一遇波高的范围比较大,靠近台湾部分最大达到了22 m,海南岛西部较小,在10～15 m之间。引用SET值相关指标对极端波浪的发生次数、持续时间和强度进行分析,发现渤海、黄海北部、台湾海峡以及南海西北部极端事件频繁发生,平均每年有5～7次,台湾岛西南部极端事件的平均历时最大,达到了32 h。     

吉林省生态旅游与旅游环境耦合协调度的时空演化研究

构建生态旅游与旅游环境评价指标体系,运用熵值赋权法与综合评价法,测算了2006~2017年吉林省各地级市州生态旅游与旅游环境发展的综合评价指数,借助耦合协调模型测度吉林省各地级市州生态旅游与旅游环境的耦合协调等级与演化情况。研究表明：吉林省生态旅游综合发展水平地区差异明显,旅游环境发展呈现不均衡特征,发展层级的极化效应愈加明显; 生态旅游与旅游环境系统的耦合协调水平整体偏低,生态旅游与旅游环境子系统的耦合表现有所差异,旅游环境总体发展滞后于生态旅游发展; 2006~2017年吉林省生态旅游与旅游环境的整体耦合协调度均为濒临失调型和初级协调型,生态旅游与旅游环境的整体协同效应较前期有所减弱： ④ 生态旅游与旅游环境耦合的协调度与生态文明呈现正向关系,生态旅游与旅游环境的协调水平愈高,区域生态文明发达程度也较高。