黑龙江霍吉河钼矿成矿地质特征及花岗闪长岩年代学、地球化学特征

霍吉河钼矿床位于小兴安岭—张广才岭成矿带北段,是近年发现的钼矿床。该钼矿含矿岩体主要为黑云母花岗闪长岩,钼矿体大多数呈细脉浸染状在花岗闪长岩中绕角砾岩筒分布。含矿花岗闪长岩锆石U-Pb谐和年龄为(184.0±1.5)Ma,形成于燕山早期;其SiO2质量分数为60.06%～69.34%、K2O和Na2O质量分数分别为3.36%～5.78%和2.60%～3.78%,铝指数A/CNK=0.78～0.98,属于偏铝质高钾钙碱性I型花岗岩;轻重稀土分馏强烈(LaN/YbN=10.96～24.99),Eu负异常不明显(Eu/Eu*=0.72～0.86);富集Rb、Ba、Th、U、K、Pb和Sr等元素,亏损Nb、Ta、Ti、Y和Yb等元素,这或者暗示其岩浆源区相对富水,或者反映岩浆源区可能遭受过俯冲带流体的交代作用,其形成与太平洋板块俯冲作用有关。结合主成矿温度、成矿地质特征及成矿构造背景,认为霍吉河钼矿成因应属于斑岩型钼矿。     

Increased summer electric power demand in Beijing driven by preceding spring tropical North Atlantic warming

本文利用北京市电力负荷资料,北京市站点观测温度资料,CN05.1温度资料,ERA5大气再分析资料及ERSST v3b海表温度资料,发现3-4月副热带北大西洋海温异常和北京市夏季电力呈很好的正相关关系,并揭示了副热带北大西洋海温异常影响北京市夏季电力的可能物理机制.春季副热带北大西洋海温异常偏暖,热带中太平洋出现东风异常...     

PEAT GEOCHEMICAL MONITORING FORENVIRONMENTAL CHANGES

II~crIOWGlobalchangesisoneofthehotquestionscaredaboutbyacademiccircles.HoWtoidentifyandabstractinformationaboutenvironmentalchangeSisanurgenttechnicalkeyinthestudyofglobalchanges.Naturaltheiesusedbyhistoricgeochemicalmonitoringsuchasglacier,loess,limneticdepoSitionhavemanyadvantages,buttheyhavecertainlimitations.Inthequantitativestudiesofdifferentecologicalenvironmentchemicalstructuresofourcountry,wemeasuredalargenumberofplants'chemicalcompoSitionandfoundthatthecompoSingdifferencesOfplants…     

The Hydrolyzation of Collagen by Fucoidan Oligosaccharide＇s Complex with CeⅣ

Fucoidan is such a polysaccharide that its hydroxies are easy to combine with lanthanons ion （Ce^IV） to form complex. This work obtained the complexes of three fucoidan oligosaccharides with different molecular weights F1 （〉5 000）, F2 （1 000-5 000） and F3 （〈 1 000） by hydrolyzing Oligosaccharide collagen with sulfuric acid. It is found that the fucoidan oligosaccharide F3 can form complex with more Ce^IV than F1 and F2. Hydrolyzing collagen with the complex was carried out to produce amino acid and peptides. All the three fucoidan oligosaccharide complexes with CeIV（ F1, F2, F3） can catalyze by the artificial hydrolytic enzyme, and the activity of the complex of F3 is the highest.     

Effect of substrate component on the growth and survival of juvenile sunray surf clam (<Emphasis Type="Italic">Mactra chinensis</Emphasis> Philippi)

Substrate is a critical environmental factor affecting the activity of bivalves. To examine the effect of the substrate component on the growth and survival of juvenile sunray surf clam(Mactra chinensis Philippi), a series of short-term experiments were conducted using a variety of substrates with different ratios of sand to mud. The experimental group cultured without substrate showed poor survival, with all juveniles died after day 20. The juveniles cultured in mud without sand showed a lower survival rate(25.54% ± 0.40% on day 45) than those in other groups. The juveniles cultured in sand without mud, or the mixtures of sand and mud with a ratio of 1:1 and 2:1, respectively, exhibited modest survival at day 45. Maximal weight gain rate(WGR), shell length growth rate(LGR), and specific growth rate(SGR) were observed when the sand concentration was 61.97%, 77.69%, and 64.64%, respectively. As the fast growth and high survival were observed when the sand to mud ratio was 1:1(50% sand) and 2:1(67% sand), a sand concentration of more than 50% is optimal. The optimal concentration of sand in the substrate for rearing juvenile sunray surf clams was 67% which resulted in the fastest growth and highest survival. These results can be used to developing a nursery/farming technique of improving the yield of sunray surf clams.     

Case Comparing Study of Downstream Circulation Development during Typhoon Extratropical Transition

The interaction between extratropical transition process and the mid-latitude jet system stimulates the downstream development. In this paper, three typhoon cases were selected to study their downstream development mechanism through the analysis of the eddy kinetic energy budget and the idealized simulations. The results of Chen’s work to the Pacific region were examined. The results were consistent with the results of Chen’s Atlantic hurricane Case. ET downstream at the upper levels generated first eddies, and the disturbances triggered the low level eddy development. Then the upper and the lower coupled and formed a deep cyclone system throughout the whole troposphere. The ageostrophic geopotential flux promoted the formation and development of the downstream ridge from the typhoon. Vertical ageostrophic geopotential flux transferred energy from upper downward that convergence happened in lower, which stimulated the lower-level cyclone development. Simulation results showed that, in the process of ET, TC outflow transported low potential vorticity to mid-latitude jet, which enhanced the PV gradient and the baroclinic. Then, it is inspired the Rossby wave in the jet and propagated downstream. The formation of downstream ridge-trough couple and development of the further wave was the spread to the downstream through the Rossby wave.     

Information diffusion theory-based approach for the risk assessment of meteorological disasters in the Yangtze River Basin

Natural Hazards - Hazard mitigation plans (HMP) inform residents and policymakers of the risks a community is vulnerable to, as well as prioritize measures implemented to minimize hazard damage....     

Discovery of lacustrine shale deposits in the Yanshan Orogenic Belt,China:Implications for hydrocarbon exploration

The mechanism of formation of lacustrine deposits within stable orogenic belts and their potential for shale oil and gas exploration are frontier themes of challenge in the fields of sedimentology and petro-leum exploration.Orogenic belts witness strong tectonic activities and normally cannot host stable lacus-trine basins and deep shale formations.Therefore,basins in orogenic belts are considered to have no potential to form shale hydrocarbon reservoirs.Here we investigate the Luanping Basin located in the Yanshan orogenic belt where previous studies regarded rivers and fan deltas as the major main Mesozoic deposits.Based on detailed field exploration and scientific drilling,we report the finding of a large number of lacustrine shale continental deep-water deposits in the Mesozoic strata.Our finding of the occurrence of active shale oil and gas also in this basin also subvert the previous perceptions.We report SHRIMP zircon U-Pb age that define the bottom boundary of the target interval as 127.6±1.7 Ma belonging to the early Cretaceous strata.Tectonics and climate are considered to be the main factors that controlled the deep-water sedimentation during this period.The drill cores revealed evidence of shale gas and the TOC of shale is 0.33％-3.60％,with an average value of 1.39％and Ro is 0.84％-1.21％,with an average value of 1.002％.The brittleness index of shale is between 52.7％and 100％.After vertical well fracturing,the daily gas production is more than 1000 m3.Our findings show that the basin has consid-erable potential for shale oil and gas.The geological resources of the shale gas in the Xiguayuan Fm.are estimated as 1110.12 × 108 m3,with shale oil geological resources of 3340.152×104t.Our findings indi-cate that the Yanshan orogenic belt has potential exploration prospect.This work not only redefines the Luanping Basin as a rift deep-water Mesozoic Lake Basin,but also rules out the previous notion that the basin is dominated by shallow water sediments.The discovery of shale oil and gas also provides an important reference for subsequent petroleum exploration and development in this basin.Our study shows that shale oil and gas reservoirs can be found in the lacustrine basins of orogenic belts which were strongly influenced by volcanism.These results have significant implications for the sedimentology and oil exploration in the Qinling and Xingmeng Orogenic Belts of China,as well as those in other terranes of the world including the New England Orogenic Belt in Australia.     

An accelerated direct demodulation method for image reconstruction using spherical data from the hard X-ray modulation telescope

The hard X-ray modulation telescope (HXMT) mission is mainly devoted to performing an all-sky survey at 1 250 keV with both high sensitivity and high spatial resolution. The observed data reduction as well as the image reconstruction for HXMT can be achieved by using the direct demodulation method (DDM). However the original DDM is too computationally expensive for multi-dimensional data with high resolution to be employed for HXMT data. We propose an accelerated direct demodulation method especially adapted for data from HXMT. Simulations are also presented to demonstrate this method.