An updated inventory of marine opisthobranch(Mollusca,Gastropoda) from the territorial waters of the Republic of Mauritius

Island ecosystems support diverse aquatic invertebrate communities comprising endemic taxa. Documentation of existing species is important for conservation. In this study, a checklist of marine opisthobranch from the Republic of Mauritius is presented. A combination of benthic surveys(50 m×5 m in triplicates), rover diving techniques and photo documentation were used over two years(2018–2020)within 35 sheltered and unsheltered lagoons. Morphological and molecular analysis were used for identific...     

震后银厂沟资源环境可持续发展研究

银厂沟坐落于龙门山脉中段,在汶川大地震中,银厂沟资源环境遭受很大损失,山体滑坡崩塌,堰塞湖的形成,地形地貌的变形,生态系统破坏等,严重影响当地的旅游业。针对这些问题提出相应的恢复重建的方案,保证当地经济的可持续发展具有重要的意义。     

Migration and the transformation of employment and household structures

Data collected in Colombia and Thailand in 1977 are used to "compare the employment and household characteristics of migrants before and after the move in order to assess the degree of change which accompanies migration. Moreover, these comparisons [are] made for migration streams between places at different levels in the urban hierarchy with the intention of determining within which streams the greatest transformations occur."     

红拟石首鱼的中间培育和养成技术

目前，红拟石首鱼的养殖业正在发展，前景看好。该鱼的亲鱼可以在圈养条件下进行培育，可根据需要进行产卵，生产仔鱼。中间培养生产包括饵料生物培养以及仔鱼长到全长２５ｍｍ养成生产包括池塘养殖、网 箱养殖和闭合循环水槽系统密集养殖。     

全球大洋循环与热通量的估算

虽然大洋循环以及随之发生的热和气与大气圈的交换对气候影响强烈，而且全球循环的讨论前人已有很好的模式，但还缺乏定量性以及研究区的资料仍相互矛盾．这里我们提出一种全球大洋循环的规模和结构及其伴随的热通量的估算与动力和运动学相一致的模式，这种模式是由快速空间变化的水文流速数据综合得出的．我们发现没有单一的水体倒转单元，而是由一个复合的和可能随时间变化的循环类型所替代．最简单的解释表明存在两个近乎独立的单元：一是大西洋水体倒转通过南部大洋与其它盆地连接：另外一个是印度洋和太平洋盆地通过印度尼西亚群岛相联…     

Microbenthic distribution of Proterozoic tidal flats: environmental and taphonomic considerations

Silicified carbonates of the late Mesoproterozoic to early Neoproterozoic Society Cliffs Formation, Baffin Island, contain distinctive microfabrics and microbenthic assemblages whose paleo-environmental distribution within the formation parallels the distribution of these elements through Proterozoic time. In the Society Cliffs Formation, restricted carbonates--including microdigitate stromatolites, laminated tufa, and tufted microbial mats--consist predominantly of synsedimentary cements; these facies and the cyanobacterial fossils they contain are common in Paleoproterozoic successions but rare in Neoproterozoic and younger rocks. Less restricted tidal-flat facies in the formation are composed of laminated microbialites dominated by micritic carbonate lithified early, yet demonstrably after compaction; these strata contain cyanobacteria that are characteristic in Neoproterozoic rocks. Within the formation, the facies-dependent distribution of microbial populations reflects both the style and timing of carbonate deposition because of the strong substrate specificity of benthic cyanobacteria. A reasonable conclusion is that secular changes in microbenthic assemblages through Proterozoic time reflect a decrease in the overall representation of rapidly lithified carbonate substrates in younger peritidal environments, as well as concomitant changes in the taphonomic window of silicification through which early life is observed.     

地质公园的建设与发展

迄今为止，我国已建立国家地质公园44处，但地质公园建设与发展的理论体系还相当不健全。笔者就地质公园建设与发展中的地质公园选址、地质公园范围的界定和地质公园规划三个重要问题进行了初步探讨。这对国家地质公园建设与发展具有一定参考、借鉴或指导意义。     

联合古陆演化时期沉积记录的全球同时性

联合古陆演化时期沉积记录的全球同时性覃建雄（成都理工学院沉积所）现代沉积学的重大进展之一，就是验证了沉积岩中岩相侧向变化的普遍性以及岩石地层单位不再成为年代地层对比的基础。然而，本世纪初以来，沉积学家们早就意识到在大陆，甚至大陆间以至全球范围内，确实...     

Fluid Inclusions in the Xichang Basin and Their Applications in Oil—Gas Exploration

Fluid inclusions are commonly observed in various stages during the diage-netic evolution and the generation,migration and accumulation of hydrocarbons in Lower Permian carbonate rocks in the Xichang Basin, providing direct physico-chemical evidence for the process.Altogether seven stages can be recognized,ie.,the penecontemporane-ous, early and mid-late diagenetic stages, the epidiagenetic stage and the early, middle and late reburying stages.Karst and dissolution pores and structural fissures developed during the epidiagenetic and reburying stages constitute the major reservoirs for hydro-carbon accumulation.Oil generation and migration began in the early reburying stage in Late Permian time and developed to its climax in the middle reburying stage in the Triassic period, followed by extensive generation and migration of natural gases during the late stage of reburying in the Jurassic and later periods.The generation,migration and accumulation of hydrocarbons are closely related to Hercynian basalt eruption and Indosinian and Yenshanian tecto-magmatism.