蒙古国矿业投资环境分析

蒙古是位于东北亚地区俄罗斯和中国之间的内陆国家,地质上属中亚褶皱带,其北为西伯利亚地台,南为华北-塔里木地台,由一系列主要为古生代的、向南凸的弧形地体拼贴而成,并被一些深大断裂带分割为六大主要的构造单元.中部近东西向的并向南凸的"蒙古主断裂带"是蒙古最大的一条线性构造,为中生代与古生代岩浆作用的分界线.     

Optical closure of parameterized bio-optical relationships

An optical closure study on bio-optical relationships was carried out using radiative transfer model matrix operator method developed by Freie Universitt Berlin.As a case study,the optical closure of bio-optical relationships empirically parameterized with in situ data for the East China Sea was examined.Remote-sensing refl ectance(R rs)was computed from the inherent optical properties predicted by these biooptical relationships and compared with published in situ data.It was found that the simulated R rs was overestimated for turbid water.To achieve optical closure,bio-optical relationships for absorption and scattering coeffi cients for suspended particulate matter were adjusted.Furthermore,the results show that the Fournier and Forand phase functions obtained from the adjusted relationships perform better than the Petzold phase function.Therefore,before bio-optical relationships are used for a local sea area,the optical closure should be examined.     

渝东-鄂西地区黄龙组层序-岩相古地理研究

渝东—鄂西地区由于受海西早期强烈构造隆升和侵蚀作用影响,大部仅残存不完整的上石炭统黄龙组,为川东地区天然气藏主要产层,也是盆地周边地区寻找新气源最有利层位之一。根据岩心观察、野外剖面实测和室内镜下岩石薄片鉴定分析,并结合岩石学、古生物及测井等沉积相标志研究,确定该区黄龙组发育萨勃哈、有障壁海岸、海湾陆棚和开阔陆棚等沉积相带,连接川东—渝北海湾与鄂西广海海水通道的发现对区域沉积相带的认识具有重要意义。在层序地层学分析的基础上,以LST、TST和EHST三个体系域作为编图单元,编制了各体系域的岩相古地理图并对其演化特征进行了描述。结合各相带储集物性特征,认为障壁粒屑滩和滨外粒屑滩为最有利储集相带。     

Thermodynamic properties of snow cover on sea ice during the austral summer in Prydz Bay,East Antarctica

The thermodynamic properties of snow cover on sea ice play a key role in the ice-ocean-atmosphere system and have been a focus of recent scientific research. In this study, we investigated the thermodynamic properties of snow cover on sea ice in the Nella Fjord, Prydz Bay, East Antarctica(69°20′S, 76°07′E), near the Chinese Antarctic Zhongshan Station. Our observations were carried out during the 29th Chinese National Antarctic Research Expedition. We found that the vertical temperature profile of snow cover changed considerably in response to changes in air temperature and solar radiation during the summer. Associated with the changes in the temperature profile were fluctuations in the temperature gradient within the upper 10 cm of the snow cover. Results of previous research have shown that the thermal conductivity of snow is strongly correlated with snow density. To calculate the thermal conductivity in this study, we measured densities in three snow pits. The calculated thermal conductivity ranged from 0.258–0.569 W?m-1?K-1. We present these datasets to show how involved parameters changed, and to contribute to a better understanding of melting processes in the snow cover on sea ice.     

龙江珠宝玉石产业蓄势待发

产自贝加尔湖的白玉和碧玉、波罗的海的琥珀、西伯利亚的紫龙晶……在近日召开的中国哈尔滨国际珠宝玉石博览会上,以展示俄玉及制品为主的东宁珠宝玉石产业基地吸引了众多客商的目光。     

中国近海浮游桡足类中华哲水蚤（Calanussinicus Brodsky）的分子系统地理学和种群遗传结构研究

Planktonic copepod Calanus sinicus is the dominant meso-zooplankton in the Northwest Pacific Ocean. To better understand its population dynamics and phylogeographic patterns, 243 C. sinicus individuals were collected from seven locations across the shelf waters of China and its population genetics was studied by mitochondrial DNA cytochrome oxidase I(mtCOI) sequences analyses. Thirty-nine different sequences, or haplotypes, were detected with moderate haplotype diversity(h=0.749) and low nucleotide diversity(π=0.003) for all populations. The evolutionary divergence between geographic populations varied from 0.24% to 0.37%, indicative of very limited genetic differentiation. Visualized minimum spanning network(MSN) and phylogenetic analysis of all the detected haplotypes did not reveal any clear phylogeographic pattern. Furthermore, AMOVA data showed no significant spatial population differentiation existed among the individuals collected across China shelf waters. Pairwise FST values showed that population collected from northwest of the East China Sea(ECS) displayed a low difference to other populations. Mismatch distribution analyses and neutrality tests indicated that C. sinicus might undergo a demographic/population expansion. No significant population genetic structuring was detected, indicating an extensive gene flow among the C. sinicus populations. Our results provide molecular evidence for the hypothesis that C. sinicus in the northwestern South China Sea in winter is transported from the East China Sea and the Yellow Sea by the China Coastal Current during the northeast monsoon period.     

中国的内海——渤海

中国近海包括渤海、黄海、东海、南海和台湾省以东太平洋一隅等5个海区。渤海位于中国近海的最北部，它虽没有中国近海其他海区那么宽广，但是渤海带给中国东北部的影响却是巨大的，     

东昆仑中段地层学研究的新进展

东昆仑中段是昆仑山地区基础研究的热点,区内地质构造复杂、地层类型多样.对构造混杂岩地层必须坚持活动论思想,采取以反序方法,有助于正确进行构造古地理的恢复.对成层有序的浅变质砂岩、板岩必须摒弃传统做法,即按一个岩系的自然成因单元结构进行.通过对东昆仑中段构造构混杂岩的万保沟岩群研究.获得了洋岛地层序列的新认识,识别了东昆仑中三叠世希里可特组的存在.对巴颜喀拉山群作了许多新研究,对中新世地层取得了重大发现,提出了青藏高原隆升的具体时间和一系列特点.     

东秦岭褶皱带河南段发现超大型金红石矿床

首次确认区内金红石的主要矿化层位为毛集群左老庄组一段地层,主要矿化集中区位于南召云阳—方城清河间30 km地段,并在宽坪群中也发现了新的矿化层位和矿化类型.首次发现大型粗粒易选矿体,突破了前人“呆矿”的结论.预测区内50 m以浅范围内金红石资源总量大于5 000万吨,为一世界级的超大金红石矿产地.