Paleogene marine deposition records of rifting and breakup of the South China Sea: An overview

A compilation of available marine deposition data from offshore S-SE China reveals evidence of rifting and breakup of the South China Sea (SCS) during the Paleogene. Marine deposition started earlier in the Paleocene in the East China Sea (ECS)-Taiwan region before expanding southwestward into the SCS region in the middle Eocene. Our data indicate the existence of an elongated Paleogene China Sea in these areas stretching along the northeasterly structural belts, probably as part of the marginal western paleo-Pacific. The southwestward shift of marine influence in the middle Eocene was responding to a period of intensive rifting and subsidence in the SCS region, while the sea in the ECS-Taiwan region started to shrink and shoal after the late Eocene, likely associated with local breakup and initial spreading in the Taiwan-Taixinan Basin area. The accumulation of hemipelagic sediments at ODP 1148 and IODP U1435 from near the continent-ocean boundary and at many other shelf-slope sites was in response to a large-scale breakup 34 to 33 Ma ago, subsequently leading to the birth of the SCS in the Oligocene.     

山西余吾井田山西组沉积环境演化及聚煤规律

通过对研究区163个钻孔岩心、测井资料以及煤矿开采揭露资料进行解释和对比,同时结合岩石组合、沉积构造、剖面结构、测井相组合以及华北晚古生代早二叠世陆表海盆地地质背景,分析了山西组的岩性组合、展布特征及演化历史。研究认为,山西组底部为陆表海环境,含菱铁质泥岩是有力证据;区内主采3号煤层形成于华北大海退之后废弃的三角洲前缘之上,煤层厚度的变化主要受沉积环境的控制和后期局部冲刷的影响,与基底环境关系不大;井田山西组沉积环境演化及厚煤层展布特征表明华北晚古生代早二叠世为一个稳定的克拉通盆地。     

Fifteen Years of Ocean Observations with China Argo

For 15 years since the beginning of China Argo project, China has deployed over 350 profiling floats in Pacific and Indian ocean, and constructed China Argo ocean observing network. Moreover, we have setup the Argo data receiving, processing and distributing system, and developed various Argo data products using Argo observations, which has promoted the progress of ocean data sharing in China. The abundant Argo data have become a main data source in oceanic and atmospheric basic researches and operational applications. A batch of important achievements in basic research and operational application have been brought, e.g. in aspects of tropical cyclone (typhoon), ocean circulation, meso-scale eddy, turbulence, heat/salt storage and transport and water mass, as well as in ocean, atmosphere/climate operational forecasting and predicting. With the extension of the international Argo program from “Core Argo” to “Global Argo”, we are faced with great challenges in the long-term maintaining and sustained developing of our Argo ocean observing network. It is suggested that we should take the opportunity to construct China regional Argo ocean observing network as soon as possible in adjacent northwestern Pacific and Indian ocean using Chinese BeiDou profiling floats, which will make us to take responsibility and obligation of a big country for addressing global climate changes and preventing natural disasters.     

福建沿海边缘陆域的原地应力测量研究

通过在福建沿海边缘陆域地区活动断裂带附近进行水压致裂原地应力测量, 得到了地表浅部构造应力的大小、方向和分布特征. 根据实测的地应力资料,用库仑摩擦滑动准则分析研究了断裂带的性质和活动性. 结果表明：① 沿海岸线边缘自北向南,其最大水平主压应力方向为北西向,与测区北西向断裂带走向近于平行,与地质构造、跨断层形变测量等方法反映的主压应力方向大体一致,与震源机制解反映的主压应力方向夹角20deg;左右; ② 水平主应力值随深度增加而增大,与垂直应力值的关系为SHSVSh和SHasymp;SV Sh, 应力状态有利于走滑断层和正断层活动;③ 利用库仑摩擦滑动准则,摩擦强度取0.6～1.0分析, 断层附近的现今地应力状态达到或超过产生正断层摩擦滑动的临界值,表明测区现今构造活动以正断层为主; ④ 反映出本区现今构造应力场的力源主要来自太平洋板块向西和菲律宾板块向北西对欧亚板块的水平挤压作用.     

Geochemistry and genesis of authigenic pyrite from gas hydrate accumulation system in the Qilian Mountain permafrost,Qinghai, northwest China

A type of authigenic pyrites that fully fill or semi-fill the rock fractures of drillholes with gas hydrate anomalies are found in the Qilian Mountain permafrost; this type of pyrite is known as “fracture-filling” pyrite. The occurrence of “fracture-filling” pyrite has a certain similarity with that of the hydrate found in this region, and the pyrite is generally concentrated in the lower part of the hydrate layer or the hydrate anomaly layer. The morphology, trace elements, rare earth elements, and sulfur isotope analyses of samples from drillhole DK-6 indicate that the “fracture-filling” pyrites are dominated by cubic ones mainly aligned in a step-like fashion along the surfaces of rock fractures and are associated with a circular structure, lower Co/Ni and Sr/Ba, lower ΣREE, higher LREE, significant Eu negative anomalies, and Δ³⁴S_CDT positive bias. In terms of the pyrites’ unique crystal morphology and geochemical characteristics and their relationship with the hydrate layers or abnormal layers, they are closely related with the accumulation system of the gas hydrate in the Qilian Mountain permafrost. As climate change is an important factor in affecting the stability of the gas hydrate, formation of fracture-filling pyrites is most likely closely related to the secondary change of the metastable gas hydrate under the regional climate warming. The distribution intensity of these pyrites indicates that when the gas hydrate stability zone (GHSZ) is narrowing, the hydrate decomposition at the bottom of the GHSZ is stronger than that at the top of the GHSZ, whereas the hydrate decomposition within the GHSZ is relatively weak. Thus, the zone between the shallowest and the deepest distribution of the fracture-filling pyrite recorded the largest possible original GHSZ.     

苍梧县橄榄生产气象条件分析①

通过对橄榄产量     

相变前的热力学平衡态对铁电液晶排列的影响

本实验选用ZLI-3654型铁电液晶(FLC)以及SE-3140型取向剂制备FLC器件样品,通过改变FLC相变过程中的降温速率以及相变前的热力学平衡态来研究FLC相变前的热力学平衡态对FLC排列的影响,共进行了十组实验.实验后,将FLC器件静态对比度进行比较,得出手性向列相到近晶A相(N^*-SmA)相变前的热力学平衡态对FLC实现均匀排列起着极其重要的作用的结论.实验结果表明:器件的静态对比度可高达620 ∶1, N^*-SmA相变前的热力学平衡态有利于形成高对比     

试谈地勘施工项目目标成本管理

作为施工类的地勘企业,工程项目是企业经营效益的源头,项目成本的控制是效益增长的中心环节.选择好的项目领导班子,建立项目成本核算体系,制定项目部经营管理目标及业绩考核办法,严格考核兑现制度,建立行之有效的激励、约束机制和目标成本管理制度体系,强化全员的成本核算意识是提升企业的整体管理水平、增强企业核心竞争力和获利水平的有效途径.     

黑龙江省塔河绿林林场一带兴华渡口群岩石地球化学特征

黑龙江省塔河西北绿林林场一带原划分的兴华渡口群的岩石地球化学成分可与太古宙绿岩带对比,该区的兴华渡口群为低级地体（火山沉积盆地）,ＳｍＮｄ模式年龄及单阶段演化年龄为（１２５２±２８～１４６３±２０）Ｍａ。     

A Study on the Abundance Distribution of Heavy Elements in Metal-poor Stars by the Parameterization Method

Based on a large amount of observed data of element abundances in metal-poor stars, taking the abundance distribution of heavy elements in the solar system as a standard, and selecting Sr, Ba and Eu as the typical elements of the three nucleosynthetic processes in metal-poor stars, namely the weak sprocess, main s-process and r-process, we have studied the contributions of the three kinds of neutron-capture processes to the abundance distribution of heavy elements in metal-poor stars, with the parameterization method. It is found that the higher the metal abundance, the greater the contributions of the weak s-process and the chief s-process to the abundances of lighter neutron-capture elements. The heavier neutron-capture elements are mainly produced by the r-process and the chief s-process; and that at low metallicity, the abundances of heavy neutron-capture elements are mainly produced by the r-process. In the early Galaxy, the weak s-process has almost no contribution to the element abundance.