用介形类优势分异度恢复古湖盆的水深--以山东东营凹陷古近系沙河街组沙三段湖盆为例   总被引：5，自引：2，他引：3       下载免费PDF全文

李守军  郑德顺  姜在兴  胡斌  王金香  焦叶红 《古地理学报》2005,7(3):399-404

从定量古生态学的角度出发,利用生态学和古生态学的资料,对介形类的优势分异度H(s)和古湖泊水深D的关系进行了相关性拟合,并得出了两者之间的关系。利用古近系东营三角洲地震资料和沉积资料验证这种对应关系的可信性,因此利用定量计算的介形类优势分异度值可以较准确确定古水深。以东营凹陷古近系沙三段沉积时期为例,恢复了三个亚段沉积时期的古水深,并做出了平面等值线图。结果表明,东营凹陷的古水深由大到小依次为中亚段沉积时期、下亚段沉积时期和上亚段沉积时期。湖泊古水深的定量恢复,对于含油气盆地的油气生、储、盖研究具有重要的意义。  相似文献   

Fluid properties and sources of Sixiangchang carbonate-associated mercury deposit,southwest China     

Zhuo  Yuzhou  Huang  Yong  Li  Jinwei  Gao  Wei  Li  Jinxiang 《中国地球化学学报》2019,38(5):670-682

Mercury mines in Guizhou province are the main base of mercury production and the most important resource base in China. The San-Dan mercury belt in Guizhou province contains a series of important mercury deposits. However, the source of metallogenic materials and the properties of metallogenic fluid of these mercury deposits have long been a controversial issue. In this study, we used cathode luminescence techniques to distinguish different stages of dolomite and calcite, laser ablation inductively coupled plasma mass spectrometry to analyze the trace elements, and stable isotope mass spectrometry techniques to analyze C–O isotopes compositions of dolomite and calcite in the Sixiangchang mercury deposit in San-Dan mercury belt. We also measured the sulfur isotope composition of cinnabar. Our study showed that dolomite can be divided into two stages, the lumpy dolomite associated with cinnabar in Dol 1 stage and dolomite vein in Dol 2 stage, which is associated with Cal 2 stage calcite vein. With the progress of mineralization, Al, As, Mo, Sb, and Sr elements were gradually enriched in the ore-forming fluid. The rare earth element (REE) partition curve of Dol 1 stage dolomite showed a trend of light REE enrichment. Cal 2 stage calcite and Dol 2 stage dolomite exhibited a flat-type REE partition curve, and Dol 2 stage dolomite showed a strong negative anomaly for Eu. δ¹³C of carbonate mineral variation ranges from − 6.89 to − 2.16 ‰, while δ¹⁸O variation ranges from 13.80 to 23.09 ‰, and the δ³⁴S variation range of cinnabar is 16.51–24.28 ‰. Carbonate mineral trace elements and C–O isotopes compositions suggested that early ore-forming fluid was reduced, and late ore-forming fluid was oxidized. The ore-forming fluid of the Sixiangchang mercury deposit is a mixture of deep crustal fluid and meteoric water in deep thermal circulation, and involved in the oxidation of organic matter. The cinnabar δ³⁴S results showed that sulfur mainly came from seawater sulfate with the participation of microbial reduction. Sulfur is sedimentary in origin and was derived mainly from the host-rock strata.

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峨眉山地幔柱沉积构造演化及沉积响应   总被引：2，自引：0，他引：2       下载免费PDF全文

王瑞华  谭钦银  付建元  牟传龙  程锦翔  王正和 《地学前缘》2011,18(3):201-210

中、晚二叠世上扬子区发生了一次规模巨大的峨眉山地幔柱事件,该事件的火山产物为峨眉山玄武岩。峨眉山地幔柱事件的沉积与构造演化、火山活动过程中的沉积特征及沉积响应等研究表明,峨眉山地幔柱经历了岩浆深部活动、火山穹窿形成、火山喷发及地壳下沉等多个阶段。地幔柱除造成火山喷发外,还引发了很多与之相关的重要事件,如火山穹窿形成、地震、海啸及热液活动等,造成的沉积响应有沉积物同生滑动、热液沉积及风暴沉积等。其中,茅口组疙瘩状团块灰岩及其相关特征是沉积物同生滑动的结果,茅口组-长兴组中的燧石是岩浆分异的热液沉积,茅口组地层中的泥质及其中粗碎屑为风暴沉积。茅口组及吴家坪组杂乱沉积与地震活动有关,或许可以称之为“震积岩”。  相似文献   

建立中国国民幸福生活核算体系的构想   总被引：30，自引：0，他引：30  

程国栋  徐中民  徐进祥 《地理学报》2005,60(6):883-893

从国家核算体系的演变和特点入手,分析了人文发展的理论内涵和中国人文发展面临的环境和社会压力,在详细分析我国是否存在环境库兹涅茨曲线的基础上,指出依靠经济增长来缓解环境压力不应当作为人文发展的主要战略核心目标。同时分析了幸福的内涵,详细讨论了人文发展状态评价的主观评价方法-国民幸福生活年和人类需求矩阵,最后提出了我国进行国民幸福核算的建议和简化框架,并针对该建议提出了聚焦贫困人口、发展循环经济、关注文化发展、处理好公平和效益的指导原则。  相似文献   

泥旦沟金矿堆浸试验研究     

阎学欣  王金祥 《青海国土经略》1995,(1)

泥旦沟金矿采用堆浸工艺,对低品位矿石进行提金试验。试验矿石品位2.25g/t,规模4795t。金的浸出率67.74％,单位矿石利润66.8元/t,经济临界品位降至1.23g/t,矿山服务年限得到有效延长。  相似文献   

Sedimentary Micro-facies and Macro Heterogeneity of Reservoir Beds in the Third Member of the Qingshankou Formation, Qian’an Area, Songliao Basin   总被引：2，自引：0，他引：2       下载免费PDF全文

SHAN Xuanlong  HU Jinxiang  Reinhard F. SACHSENHOFER  SHI Tiaotiao 《《地质学报》英文版》2007,81(6):1033-1040

An analysis of drill cores and well logs shows that the main micro-facies of the third member sand bodies of the Qingshankou Formation in Qian’an are subaqueous distributary channel facies, sheet sand facies and subaqueous fan facies (olistostrome). Maps showing the distribution of these micro-facies together with inter-channel bay and prodelta mocro-facies are presented for different time-slices (lower, middle and upper parts of the Qingshankou Formation). These maps reveal the instability and change of sediment transport in the Baokang sedimentary system during the depositional period. Sediment transport was from the west in the early stage, from the south in the middle stage and from the northwest in the late stage. Values of thickness, porosity and permeability of the sand bodies in the third member of the Qingshankou Formation show that they have low to medium porosity and low permeability, and are characterized by serious reservoir heterogeneity. The joints between micro-facies and subaqueous fan micro-facies are characterized by the highest heterogeneity, the sheet sand and distal sand bar subfacies come next, and the heterogeneity of the subaqueous distributary channel sand bodies is relatively weak.  相似文献   

Geology, Ar-Ar Age and Mineral Assemblage of Eocene Skarn Cu-Au±Mo Deposits in the Southeastern Gangdese Arc, Southern Tibet: Implications for Deep Exploration     

Guangming Li    Kezhang Qin    Kuishou Ding    Tiebing Liu    Jinxiang Li    Shaohuai Wang  Shanyuan Jiang  Xingchun Zhang 《Resource Geology》2006,56(3):315-336

Abstract. Medium‐ and large‐scaled skarn Cu‐Au±Mo deposits, e.g. Kelu, Liebu, Chongmuda and Chenba among others, are distributed in Shannan area of the Gangdese Cu‐Au metallogenic belt. Intrusions‐related skarn copper mineralization belongs to high K and calc‐alkaline rock series, located in late collision volcano‐magmatic arc and formed between 20 to 30 Ma. Copper mineralization occurs at exocontact zone of the lower Cretaceous Bima Group carbonate and other calcareous‐bearing sedimentary rocks with intrusions. At present, three main mineralization types are identified, including skarn type, hydrothermal vein type and porphyry type. Mineralizing associations are Cu‐Mo, Cu‐Au and Cu. In ore districts, those mineralization types form an entire porphyry‐skarn Cu‐Au±Mo ore‐forming system. Alterations of the exocontact are mainly skarnization and hornfelsization, while the alterations of the endocontact are mainly sericitization, silicification, and chloritization of intrusion. In the study area, the endoskarn is not well developed. Copper mineralization occurs mainly in the exocontact in the form of stratoid, lenticular and pockety ore body. Veined mineralization can be seen in marblized and hornfelsed siltstone, being away from the contact zone. In the endocontact, the mineralization is mainly veinlet‐like and disseminated. In Shannan area, skarnization can be divided into early skarnization stage and late hydrous silicate stage. The early skarnization stage is featured by mainly andradite and grossular skarn, containing minor diopside, hedenbergite, magnetite and some copper minerals; and the late hydrous silicate stage is of replacement of garnet skarn by chlorite, epidote, quartz and calcite together with sulfides precipitation. The latter is the main stage of copper mineralization. Bornite is the dominant ore mineral associated with minor chalcopyrite and pyrite; and gold as well as silver are distributed in bornite and wittichenite. Results of microthermometry study of fluid inclusions in quartz of late hydrous silicate stage from different deposits show intermediate temperature and low to intermediate‐salinity features for all samples. The dominant inclusion type is composed of two phases, being about 4 to 15 % vapor and 85 to 96 % liquid at room temperature. Homogenization temperatures range from 232 to 335d?C. Salinities have been recorded between 4.2 and 15.5 wt% NaCl equivalent. Boiling fluid inclusions are not identified and it indicates that metal deposition mainly resulted from water‐rock reactions. The results of sulfur isotope analysis indicate that the sulfur isotope values (δ³⁴S 1.29–1.68 %o) of the samples collected from skarns are similar with that from the endocontact (δ³⁴S 1–1.75 %o). Both of them have very close sulfur isotope values (near δ³⁴S 0 %o), which indicate the sulfur of both the skarn type and the porphyry type mineralization was from deep sources. Ages determined on biotite from ore‐bearing intermediate porphyries by Ar‐Ar methods range from 23.77±0.29 to 29.88±0.56 Ma, showing that skarn copper mineralization in the study area evidently is older than the porphyry Cu(‐Mo) mineralization in Gangdese, and likely representing another metallogenic event. The Cu‐Au skarn deposits in the Kelu‐Liebu‐Chongmuda belt are interpreted as the shallow level, skarn‐related deposits in a porphyry‐skarn mineralization. Appearance of porphyry copper mineralization in some skarn deposits implies that skarn copper mineralization of the study area resemble to those in northern sub‐metallogenic belt, having uniform porphyry‐skarn ore‐forming system. Therefore, it is presumed there should be potential to find deep level porphyry‐type Cu‐Au mineralization targets.  相似文献   

自动监视系统     

李锦祥  苏光奎  陈曼玲 《武汉大学学报(信息科学版)》1986,(3)

本文论述了在微型计算机硬件接口及面向用户软件的支持下,自动对监视现场实现多路、並行的实时监视,自动处理报警信息以及获得清晰图象、良好声响等功能的设计思想及其实现技术。  相似文献   

泉州湾污损生物生态研究   总被引：5，自引：4，他引：1  

林和山  王建军  郑成兴  林俊辉  黄雅琴  何雪宝  李荣冠  郑凤武  江锦祥 《海洋学报》2014,36(4):100-109

2001年12月—2002年11月在泉州湾海域进行了污损生物周年挂板试验,共记录污损生物112种,以近岸暖水种为主,其中长鳃麦秆虫(Caprella equilibra)和网纹藤壶(Amphibalanus reticulates)是该海域最具代表性的优势种,其次为裂片石莼(Ulva fasciata)、中胚花筒螅(Tubularia mesembryanthemum)、薮枝螅(Obeliasp.)、纵条矶海葵(Haliplanella luciae)、外伪角涡虫(Pseudoceros exoplatus)、柄涡虫(Stylochus sp.)、僧帽囊牡蛎(Saccostrea cucullata)、翡翠贻贝(Perna viridis)、巴西地钩虾(Podocerus brasiliensis)、强壮板钩虾(Stenothoe valida)、镰形叶钩虾(Jassa falcata)和角突麦秆虫(Caprella scaura)等种类。该海区污损生物全年均可附着,种类丰富且附着强度大,附着盛期在4—11月,月板、季板、半年板和周年板的平均附着生物量分别为2 624g/m2、5 309g/m2、6 210g/m2和8 247g/m2,夏季可达11 295g/m2。随着试板浸海时间的延长,试板上污损生物群落的多样性明显增加,且结构也趋于稳定。  相似文献   

Community structure and spatial distribution of macrobenthos in the shelf area of the Bering Sea   总被引：2，自引：2，他引：0  

WANG Jianjun  HE Xuebao  LIN Heshan  LIN Junhui  HUANG Yaqin  ZHENG Chengxing  ZHENG Fengwu  LI Rongguan  JIANG Jinxiang 《海洋学报(英文版)》2014,33(6):74-81

Field investigations of marine macrobenthos were conducted at ten sites in the Bering Sea in July 2010. Altogether 90 species of macrobenthos belonging to 59 families and 78 genera were identified. Among them, 41 polychaetes, 16 mollusks, 23 crustaceans, three echinoderms, two cnidarians, one nemertean, one priapulid, two sipunculids, and one echiuran were identified. The average density and biomass of total macrobenthos were 984 ind./m2 and 1 207.1 g/m2 of wet weight, respectively. The predominant species in the study area were Scoloplos armiger, Eudorella pacifica, Ophiura sarsii, Heteromastus filiformis, Ennucula tenuis, and Harpiniopsis vadiculus by abundance, while the predominant species in this area was Echinarachnius parma by biomass. Hierarchical cluster analysis(Bray–Curtis similarity measure) revealed that two important benthic assemblages in the study area were Community A and Community B. Community A was stable and Community B was unstable, as shown by the Abundance/Biomass Comparisons(ABC) approach. The macrobenthic community structure in the shelf of the Bering Sea was characterized by its high abundance and biomass, high productivity but great heterogeneity.  相似文献