南秦岭毒重石成矿带矿床中的生物成因重晶石及其意义

紫阳黄柏树湾毒重石矿床和竹山文峪河毒重石-重晶石矿床呈层状或似层状产于下寒武统下部或其相当层位的硅质岩中,矿体受岩性和岩相控制作用明显.矿床中毒重石、钡解石和方解石的碳、氧同位素研究结果表明,组成这些矿物的碳主要为有机成因碳;毒重石或重晶石矿石中发现的生物成因重晶石(bio-barite)说明Ba主要通过生物成因重晶石的形式将海水中的Ba2 浓集并沉降于海底,形成钡矿床的初始富集体,而毒重石是在早期成岩阶段在生物和有机质作用下交代重晶石的基础上形成的.     

碳热还原重晶石无氧工艺研究

针对利用重晶石生产碳酸钡工艺中,因氧气气氛而存在钡利用率低、熟料中产生大量酸溶性钡,导致钡渣排放量大等问题。采用N_2保护对重晶石还原工艺进行了改进,考察了反应温度、反应时间、物料配比和重晶石粒度对水溶性钡及酸溶性钡得率的影响。结果表明,在反应温度为1 000℃,反应时间为40 min,物料质量配比为重晶石∶活性炭=6∶1,重晶石粒度为180~200 mesh的工艺条件下,水溶性BaS得率可达到90.27%,酸溶性钡为7.61%。     

不同钡矿物对制备无水硫铝酸钡钙矿物的影响

目的研究不同钡矿物对制备无水硫铝酸钡钙矿物的影响,为工业生产含钡硫铝酸盐水泥提供理论依据.方法分别采用毒重石和重晶石为含钡原材料,在1 400℃保温180 min的烧成制度下烧成硫铝酸钡钙矿物(2Ca O·Ba O·Ca SO4),使用X射线粉末衍射法对烧成熟料进行测试,并使用TOPAS软件进行定量分析.结果在全谱拟合过程中,使用毒重石制备无水硫铝酸钡钙矿物的Rw p的值为7.71%,使用重晶石制备无水硫铝酸钡钙矿物的Rw p值为12.64%,使用毒重石烧成的熟料中无明显杂质相,使用重晶石烧成的熟料中出现了11.22%的铝酸钡.结论使用毒重石制备的无水硫铝酸钡钙矿物比使用重晶石制备的矿物更为纯净.     

水体中有机质的类型与有机质沉积作用

在对水体中各类有机质特征充分调研的基础上,依据成因和形态特征划分出生物有机质、溶解有机质、胶体有机质和聚合有机质四种基本形式,它们在有机质的聚集和沉积作用过程中的特征和差异性,必将影响沉积物中有机质保存的多样性.生物有机质既是有机质的保存者,也是其他有机质类型的物质提供者;溶解有机质和胶体有机质分布广、化学活性强,可以相互之间及与无机矿物间聚合,是有机质聚集和循环过程中重要的中间环节;聚合有机质的形成与生物及环境的物理化学条件改变相关,类型多样,但它是携带有机质沉积和保存的重要载体.水体中不同类型有机质既可以形成有机颗粒,又可以相互转化,造成了有机质沉积过程和保存方式的多样性,决定了沉积物中有机质类型和演化的差异性.     

冀北异剥钙榴岩中的钡冰长石的发现及地质意义

在冀北异剥钙榴岩中首次确定钡冰长石.该钡冰长石仅分布在白旗和三道沟等地,为半自形-他形粒状.化学成分、红外光谱及X射线衍射研究显示,冀北异剥钙榴岩中存在有低温系列的钡冰长石,其BaO的质量分数变化较大,为2.25%～6.70%.该钡冰长石的形成可能是钡交代作用的结果,钡的来源可能与热水成因的重晶石有关.     

浙江沿海平原第四系生物气特征和成藏条件

研究了第四纪生物气特征、成藏条件及勘探方向．结果表明,河漫滩和近岸浅海泥质沉积物既是气源岩,又是盖层,后者可作为区域盖层．气源岩有机碳一般大于０．４％,但由于其埋藏浅,有机质属于未成熟阶段,尚未大量裂解成烃．盖层的孔隙水压力可能对生物气藏保存起着最主要的封闭作用．分布在下切河谷内的河漫滩砂质透镜体为唯一具工业价值的储气层,气藏岩性圈闭,属自生自储型．下切河谷和古河口为生物气形成和富集提供了有利条件     

离子交换法分解重晶石

本文讨论了用离子交换树脂分解重晶石的基本原理及方法,通过实验研究了单位重量树脂提取钡的能力与阴阳离子交换树脂重量比、矿石与阳离于交换树脂的重量比、P~H值、反应时间等各种因素的关系。确定了主要工艺条件。证明用离子交换树脂提取重晶石中的钡,生产钡盐是可行的。     

海南石碌铁矿成矿过程的地球化学

石碌铁矿含铁建造富含钡、锰,其丰度比克拉克值高数倍以至数十倍。铆、锰与含铁建造的紧密联系显示着它们与铁同源。本矿区最重要的含钡矿物是重晶石,但钡也出现在钡硬锰矿、硅铁钡石等矿物中。它也可以为粘土矿物和铁或锰的氢氧化物所吸附。二价锰的矿物几乎不含钡,含钡高的锰矿物锰的价态主要为四价。石英和赤铁矿在铁矿石或含铁石英岩中的结构主要是胶状结构和固溶体分解结构,由铁-硅胶体脱水重结晶而成。这种胶体只能由海底火山喷发所造成。     

贵州瓮安白岩陡山沱组磷块岩特征及矿床成因

探讨贵州瓮安磷矿的磷块岩特征及磷矿床成因,为磷矿的勘查部署和开采提供理论依据。通过对瓮安白岩背斜震旦系陡山沱组含磷岩系岩石学、地球化学特征的分析,结合成矿环境、物质来源方面的地质特征研究,认为磷质来源于海底火山,受古地理环境、高水位海侵、上升洋流和生物有机质的作用,形成瓮安大型磷矿床。该磷矿的形成与陡山沱期古海洋环境改变所引发的生物事件关系密切,反映了震旦纪陡山沱期的后生生物早期爆发与成矿事件协同演化的特点。     

贵州天柱寒武系底部重晶石矿床中热水生物群的发现及意义

贵州天柱寒武系牛蹄塘组重晶石矿床属世界上最大的重晶石矿床,其储量达到2亿吨以上,大量的岩石、地球化学研究成果表明其属于热水成因.该研究通过系统样品采集、岩石切片和生物显微镜下鉴定,发现其中包含大量的藻类、海绵骨针、管状生物等化石,这种生物组合特征类似现代太平洋海底热水生物群.这一发现说明寒武纪早期大量的热水沉积中存在有特殊的热水生物群落,它是寒武纪早期重要的生态类群,这对寒武纪生物大辐射原因研究提供了重要的材料.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with     

Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

正~~     

An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

An improved R-tree based on childnode''s probability

R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree).     

Integrating GIS Web services based on mediating architecture

The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included.     

Tracking data management using topology of moving object database system for moving object constrained trajectory in LBS application

Advances in wireless technologies and positioning technologies and spread of wireless devices, an interest in LBS (Location Based Service) is arising. To provide location based service, tracking data should have been stored in moving object database management system (called MODBMS) with proper policies and managed efficiently. So the methods which acquire the location information at regular time intervals then, store and manage have been studied. In this paper, we suggest tracking data management techniques using topology that is corresponding to the moving path of moving object. In our techniques, we update the MODBMS when moving object arrived at a street intersection or a curved road which is represented as the node in topology and predict the location at past and future with attribute of topology and linear function. In this technique, location data that are corresponding to the node in topology are stored, thus reduce the number of update and amount of data. Also in case predicting the location,because topology are used as well as existing location information, accuracy for prediction is increased than applying linear function or spline function.