Distribution of persistent organic pollutants in bivalves from the northeast coast of China

To assess the levels of organochlorine compounds (OCs) in the Chinese coastal environment, monitoring study using bivalves was conducted in 2005. A total of 21 bivalve samples covering the northeastern coast of China were collected and analyzed. Organochlorine compounds were widely distributed in the Chinese coastal environment, with dichlorodiphenyltrichloroethane (DDT) contamination being particularly prevalent. The overall concentrations of PCBs, DDTs, HCHs, chlordane compounds (CHLs), dieldrin, and endosulfans in bivalves were in the ranges of 3.27-25.4, 54.8-2680, 1.42-25.5, n.d. (not detected)-2.28, n.d.-4.02, and n.d.-9.55 ng g(-1) on a dry weight basis, respectively. The concentrations of DDT and HCH compounds are relatively higher than those from the coastal areas of other Asian countries. DDT metabolites were predominant, suggesting that the degradation of DDT is in progress in the Chinese coastal environment. Still, however, DDTs of high concentration exceeding 1000 ng g(-1) were observed at 19% of the stations surveyed. Among HCH compounds, beta-HCH, which is an isomer with strong persistency, was observed predominantly. Compositions of DDT and HCH compounds imply that fresh input of the two compounds into the Chinese coasts is possibly low.     

辽宁太子河流域晚元古宙青白口系震积岩的发现及其意义

介绍了辽宁太子河流域新发现的晚元古宙青白口系南芬组震积岩的层序。该层序为原地系统震积岩,由液化泥晶脉、震褶岩、震塌岩及地裂缝等组成。这是目前在我国所发现的最低层位碳酸盐岩振动液化地震事件记录。     

新疆查汗沙拉锑矿床地质特征及成因初探

新疆察汗萨拉锑矿床位于西南天山中部的萨阿尔明晚古生代沟弧带的西段,它与萨瓦亚尔顿金锑银矿、卡拉脚古牙锑金矿、古勒克达坂卡堤锑金矿构成察汗萨拉锑金矿带。矿区总体受控于一大型逆冲推覆构造带,处于查汗沙拉锑异常区浓集中心域内,矿体产于阿尔腾克斯组含炭碎屑岩中,显示多元素多期次的成矿特征。成矿物质来自于赋矿地层,成矿热液则是由岩浆水和天水组成的混合水,属沉积改造型锑银多金属矿床。     

Molecular ecological responses of dinoflagellate, Karenia mikimotoi to environmental nitrate stress

Karenia mikimotoi is one of the most important harmful algal species in the Chinese coastal waters, and which produce hemolytic toxins and ichthyotoxins, resulting in devastating economic losses. Previous studies demonstrated that the increase of nitrate concentration could promote the growth and reproduction of K. mikimotoi. However, the intrinsic mechanisms regarding the effects of nitrate on the K. mikimotoi photosynthesis, nucleic acid replication and differential protein expression remain to be elucidated. Our study demonstrated that nitrate stress inhibited growth of K. mikimotoi (p < 0.01). Algal chlorophyll fluorescence intensity varied slightly while algal cell cycle succession was significantly retarded by nitrate stress (p < 0.05). Sixteen proteins were detected only in nitrate-limited cultures which related to nitrate transport, signal transduction, amino acid metabolism, DNA repair and hemolysin manufacture. Eleven proteins were detected only in nitrate-replete sample and were related to photorespiration, reproduction and growth, assistance of protein modification, cytoskeleton stability and signal transduction. Based on analysis of differential proteomic functional annotations, we hypothesized a proteomic response mechanism of K. mikimotoi to environmental nitrate stress.     

Bioaccumulation of trace metals in the submarine hydrothermal vent crab Xenograpsus testudinatus off Kueishan Island, Taiwan

The concentrations of ten trace metals were determined in the gills, muscles, hepatopancreas, and exoskeleton tissues of Xenograpsus testudinatus that lives around shallow and acidic hydrothermal vents off Kueishan Island, northeastern Taiwan. The analytical results demonstrate that the metal concentrations vary significantly with the type of crab tissue. The concentrations of Al, Cd, Co, Cu, Fe, Ni, and Zn are highest in the gills, whereas the concentration of Mn is highest in the exoskeleton. Cr and Pb concentrations are similar across the different tissues. The enhanced accumulation of most metals in the gills suggests the metal accumulation via the respiration pathway rather than the uptake of food. The results also reveal that the distribution patterns of metals in tissues are similar in the hepatopancreas and muscles, but very different in both the gills and the exoskeleton, perhaps because of the different pathways of metal utilization in the different crab tissues.     

新疆和静县大山口金矿床地质特征及其与穆龙套金矿床对比

大山口金矿区赋矿地层为上志留统-下泥盆统大山口组含碳细碎屑岩建造,赋矿构造为大山口韧性剪切带.矿区总体构造线走向NWW向,总体构造格架为大山口断裂和可肯达板断裂两个断裂所夹持的乌兰赛尔-大山口韧性剪切带,该剪切带宽度2~3 km,长度大于100 km;矿区内长度大于1.7 km,强剪切带宽度300~500m.韧性剪切带宏观上表现为强烈的片理化带、S-C组构、b型褶皱、构造透镜体发育,石英细脉表现为肠状褶曲.剪切带主要由糜棱岩和糜棱岩化岩石组成.大山口金矿床即产于该韧性剪切带内,由石英大脉-网脉及其边部的蚀变糜棱岩构成金矿石,金矿体几乎无一例外地均产于大山口韧性剪切带内.矿区内未见有大的侵入岩体出露,但是有较多的闪长岩、英安斑岩岩脉侵入于韧性剪切带内.将矿床与乌兹别克斯坦共和国境内的穆龙套金矿床进行了对比,并参考了穆龙套金矿区超深钻新资料.通过对比可以看出,两矿床的成矿地质条件基本相同,应属于同一个金矿类型,但也存在一定的差别.我们认为,在大山口金矿区,除应进一步加强区域上金矿成矿条件的勘查与研究外,应注意深部成矿的勘查与研究,以期解决大山口金矿床地表金矿化"只见星星、没有月亮"的困境.     

新疆和静县大山口金矿床地质特征及其与穆龙套金矿床对比

大山口金矿区赋矿地层为上志留统－下泥盆统大山口组含碳细碎屑岩建造,赋矿构造为大山口韧性剪切带,矿区总体构造线走向NWW向,总体构造格架为大山口断裂和可肯达板断裂两个断裂所夹持的乌兰塞尔－大山口韧性剪切带,该剪切带宽度2－3km,长度大于100km,矿区内长度大于1．7km,强剪切带宽度300－500m,韧性剪切带宏观上表现为强裂的片理化带,S－C组构,b型褶皱,构造透镜体发育,石英细胞表现为肠状褶曲,剪切带主要由糜棱岩和糜棱岩化岩石组成,大山口金矿床产于该韧性剪切带内,由石英大脉－网脉及其边部我蚀变糜棱岩构成金矿石,金矿体几乎无一例外地均产于大山口韧性剪切带内,矿区内未见有有大的侵地体出露,但是有较多的闪长岩,英安斑岩脉侵入于韧性切带内,将矿床与乌兹别克斯坦共和国境内的穆龙套金矿床进行了对比,并参考了穆龙套放区超深钻新资料,通过对比可以看出,两矿床的成矿地 质条件基本相同,应属同一个金矿类型,但也存在一定的差别,我们认为,在大山口金矿区,除应进一步加强区域上金矿成矿条件的勘查与研究外,应注意深部成矿的勘查与研究,以期解决大山口金矿床地表金矿化“只见星星,没有月亮”的困境。