辽河口地区红海滩的形成、演化及开发保护对策

在辽河口地区平均海潮线以上的近海滩涂,尤其是滨海潮沟或受海潮影响的低洼地带,土壤湿度大,盐碱度高,生长着一种罕见的红色翅碱蓬,属生态地质景观,远处望去,颇似红地毯,景色蔚为壮观,这就是闻名遐迩的红海滩。其面积、景色在全国,乃至全世界也不多见,构成了盘锦市旅游资源的核心。     

A Rapid Assessment of Scleractinian and Non-Scleractinian Coral Growth Forms Along the Saudi Arabian Coast,Red Sea

In this study we assessed the current status of coral reefs along the Saudi Arabian coast of the Red Sea. Among the three growth forms of Acroporid corals, the branching forms were found to dominate in the Farassan Islands （44.55%±11.10% cover） fol-lowed by tabular forms in the Doga Islands （ranging between 18%±6.47% and 18.30%±9.47% cover）. Digitate forms were rarely found along the coast except at Maqna. Among the five growth forms of non-Acroporid corals, we observed maximum cover of branching forms in the Yanbu offshore area （58.89%±15.11% cover） followed by the Jeddah coast （24.76%±14.04% cover）. The Millepora spp., a non-Scleractinian coral, was abundant at all the near-shore sites, such as Jeddah （10.70%±8.21%） and A1-Wajh （9.81%±6.69%）. The live coral cover （including both Scleractinian and non-Scleractinian corals） of Saudi Red Sea coast was seen to be higher in the north and gradually decrease towards the south. Principal Component analysis showed that the contribution of Acro- porid corals was greater in the southern region than in the northem and middle regions, but vice-versa in the case of non-Acroporid corals. Bray-Curtis cluster analysis categorized all the study sites into two major clusters with 60% similarity. Among them, one cluster-forming sites from Maqna to Masturah （Northem region） and the second one comprised the middle and southem regions （Jeddah to Farassan Islands）, and one outlier Rabigh.     

辽河口地区红海滩的形成、演化及开发保护对策

在辽河口地区平均海潮线以上的近海滩涂,尤其是滨海潮沟或受海潮影响的低洼地带,土壤湿度大,盐碱度高,生长着一种罕见的红色翅碱蓬,属生态地质景观,远处望去,颇似红地毯,景色蔚为壮观,这就是闻名遐迩的红海滩。其面积、景色在全国,乃至全世界也不多见,构成了盘锦市旅游资源的核心。     

北天山巴音沟蛇绿岩形成时代的精确厘定及意义

应用SHRIMP方法对北天山巴音沟蛇绿岩中侵入辉长岩内的斜长花岗岩进行了锆石UPb年龄测定,表明斜长花岗岩形成于(324.8±7.1)Ma(2σ)。这一年龄精确反映了巴音沟蛇绿岩的形成时代于早石炭世晚期。巴音沟蛇绿岩形成于强烈大陆伸展作用导致的大陆裂谷向大洋裂谷转变的一种动力学环境,记录了由于裂谷作用强烈拉伸形成的初始洋壳,是晚古生代天山地区“红海型”洋盆的地质记录。     

Effects of the Thermal Contrast Between Indo-China Peninsula and South China Sea on the SCS Monsoon Onset

The seasonal and interannual variations of the thermal contrast between Indo-China Peninsula (ICP)and South China Sea (SCS) were analyzed using the pentad mean NCEP/NCAR reanalysis data during 1958-1998 and the pentad mean outgoing long-wave radiation (OLR) data during 1975{1998, along with the effects of such a thermal contrast on the SCS monsoon onset (SCSMO). It is shown that there exists significant seasonal evolution for such a thermal contrast. The surface temperature of ICP is higher than that of SCS from pentad 3 to pentad 25 due to the sensible heating of the ICP. After pentad 25, such a thermal gradient reverses due to the temperature decrease resulted from the convection and rainfall over the ICP from pentad 22 to pentad 23. Furthermore, the above seasonal evolution of the discussed thermal contrast also demonstrates a remarkable interannual change which plays an important role in the SCSMO.On one hand, the reversion happens prior to (or simultaneously with) the SCSMO each year during 1958-1998, thus becoming a precondition for the SCSMO. On the other hand, the earlier (later) the date when the surface temperature of ICP becomes higher (lower) than that of the SCS, the later the SCSMO.     

巴音沟蛇绿岩岩石成因演化:天山早石炭世“红海型”洋盆的地质记录

巴音沟蛇绿岩岩片是北天山早石炭世蛇绿岩带的组成部分 ,是天山石炭—二叠纪裂谷系北缘的早石炭世“红海型”洋盆的地质记录。早石炭世晚期的巴音沟蛇绿岩套被侵位于早石炭世浅海—陆相裂谷火山 -沉积岩系 (火山岩单元 )之中。该蛇绿岩套由超镁铁岩、辉长岩 (具共生斜长花岗岩脉 )、闪长岩、辉绿岩、枕状玄武岩和块状熔岩组成。早石炭世裂谷化和北天山洋盆的开启产生了拉斑玄武质岩浆及少量演化岩浆。微量元素和 Nd、Sr、Pb同位素成分揭示 ,存在两种幔源 :1火山岩单元的早石炭世裂谷镁铁质熔岩产生于软流圈OIB型板内源的较低度部分熔融 ;…     

凭海临风 对洒当歌

下午，我们穿越了东部沙漠，从卢克索向红海的度假圣地古尔代盖进发。这条线虚该也是当年摩两出埃及的路线，没想到从文明跨出几步便是无边荒原了。     

红海的升降

Siddal等提出了重新构建末次冰期海平面变化的新方法。他们提供了一个分辨率为百年尺度、时间范围在70～25ka之间的详细记录。这是冰期剧烈变动期，表现为明显的冷热波动。在约10ka前进入我们现在间冰期之前，末次冰期旋回在18ka以前达到顶点，即所谓的末次冰期的最盛期。过去海平面如此令人感兴趣的原因是他们反映了全球气温，在较冷期，更多的地球水固结在冰盖中，从而导致海平面的下降。