云南个旧老厂锡石地球化学特征与成矿

云南个旧锡多金属矿床是全球最大的矿田之一,位于华南华夏板块的西缘。现在该矿田已经探明的锡资源储量超过200万吨,有色、稀有及贵金属资源总储量超过1000万吨。晚白垩世火成岩在该矿区内广泛分布,其中花岗岩与成矿关系密切。前人对个旧锡多金属矿床的矿床地质特征、矿床成因、成岩和成矿时代做了很多工作,并且提出了相应的成矿模式,包括典型岩浆热液成矿模式、三叠纪同生层状氧化成矿

水母暴发对海洋水产养殖业的影响研究进展

As a marine biological disaster, the jellyfish blooms has been a hot issue in the field of marine ecology. Hydromedu sae, siphonophore, scyphomedusae, cubomedusae and ctenophore are found in aquaculture ponds or cages, which has a serious impact on aquaculture production. This study integrally describes the harmful jellyfish types and main related hazards to aquaculture, analyzes the possible harms of aquaculture activities on jellyfish blooms. And based on the previous study, we put forward several proposals in prevention of jellyfish disasters in aquaculture.</p

Dietary analysis of two hydromedusa in situ based on high-throughput sequencing technique

The diet composition of jellyfish is a key issue of feeding ecology research. This paper used highthroughput DNA sequencing technique to identify the food composition of Sarsia tubulosa and Rathkea octopunctata,in situ. The results showed that the food types of Sarsia tubulosa and Rathkea octopunctata were multitudinous. The Sarsia tubulosa predated 31 different species,while the Rathkea octopunctata preyed 29. In term of food composition,the two species of jellyfish were omnivorous organisms,included zooplankton,fungi,phytoplankton,terrestrial plant detritus and so on. The Sarsia tubulosa and Rathkea octopunctata were mutual predators. The food groups of 2 species were similar. Arthropods and Maxillopoda were the most frequently observed phylum and class in the food of both Sarsia tubulosa and Rathkea octopunctata. The dominant species was Eurytemora pacifica,which accounted for 45. 14% and 42. 42% of the food source,respectively. The utilization of high-throughput sequencing technique is a new and useful tool for studying the diet of jellyfish in situ,and the food composition resulted from 2 jellyfish provides a significant reference for jellyfish feeding ecology

海南岛晚燕山期侵入岩岩石地球化学特征与深部动力学机制

海南岛位于欧亚板块、太平洋板块和印度-澳大利亚板块交汇部位,亦是特提斯构造域与太平洋构造域叠置区,其独特的构造位置,为研究华南陆块构造演化及南海形成等重要科学问题提供关键的线索(Sun et al.,2017)。晚燕山期是华南地区构造演化的关键时段,这一时期至以后的早新生代,涉及华南地区大陆边缘的性质转换。海南岛位于华南陆缘的西南部,是楔入南海海域的