汝箕沟煤中矿物的成因研究及其意义   总被引：1，自引：0，他引：1  

张慧  李小彦 《矿物学报》1993,13(4):362-367

本文在较大量和详细的煤岩煤质研究之后，进而用电子探针、扫描电镜及显微镜热台等对宁夏汝箕沟无烟煤中矿物的分成、晶形、微量元素、包裹体温等进行了成因研究。结果表明，汝箕沟煤中的次生矿物及原生矿物的次生变化均与中－低温热液作用有关，这将为该区煤变质成因提供直接证据。  相似文献   

Ultraviolet Photoprocessing of Interstellar Dust Mantles as a Source of Polycyclic Aromatic Hydrocarbons and Other Conjugated Molecules     

Greenberg JM  Gillette JS  Muñoz Caro GM  Mahajan TB  Zare RN  Li A  Schutte WA  de Groot M  Mendoza-Gómez C 《The Astrophysical journal》2000,531(1):L71-L73

By co-depositing a gas mixture of simple carbon- and nitrogen-containing molecules with water on a 10 K surface and exposing it to ultraviolet radiation, we were able to form a residue. This residue was then placed aboard the EURECA satellite behind a magnesium fluoride window and exposed to solar radiation for 4 months before it was returned and analyzed. The resulting residue is believed to simulate the photoprocessing of organic dust mantles in the interstellar medium. Mass spectrometry indicated that the photoprocessing created a rich mixture of polycyclic aromatic hydrocarbons (PAHs) and other conjugated organic molecules, which may explain how PAHs are replenished in space.  相似文献   

地质资料数字化的作用及推进数字化工作的途径          下载免费PDF全文

李婕  沃恒怒 《江苏地质》2008,32(4):340-342

阐述了数字化是当前地质档案管理的发展趋势,提出了应加快实现档案数字化网络建设及地质资料管理数字化建设目标。  相似文献   

Paleoproterozoic,High-Metamorphic,Metasedimentary Units of Siberian Craton     

Lena URMANTSEVA  Olga TURKINA 《《地质学报》英文版》2009,83(5):875-883

Abstract: Sensitive, high-resolution ion microprobe zircon U–Pb ages of Paleoproterozoic, high-grade, metasedimentary rocks from the south-western part of the Siberian Craton are reported. Early Precambrian, high-grade complexes, including garnet–biotite, hypersthene–biotite, and cordierite-bearing gneisses compose the Irkut terrane of the Sharyzhalgay Uplift. Protoliths of studied gneisses correspond to terrigenous sediments, ranging from greywacke to shale. The paragneiss model Nd ages of 2.4–3.1 Ga indicate Archean-to-Paleoproterozoic source provinces. Zircons from gneisses show core-rim textures in cathodoluminescence (CL) image. Round or irregular shaped cores indicate detrital origin. Structureless rims with low Th/U are metamorphic in origin. The three age groups of detrital cores are: ≥2.7, ~2.3, and 1.95–2 Ga. The ages of metamorphic rims range from 1.86 to 1.85 Ga; therefore, the sediments were deposited between 1.95 and 1.86 Ga and derived from Archean and Paleoproterozoic source rocks. It should be noted that Paleoproterozoic metasedimentary rocks of the Irkut Block are not unique. High-grade metaterrigenous sediments, with model Nd ages ranging from 2.3 to 2.5 Ga, are widely distributed within the Aldan and Anabar Shields of the Siberian Craton. The same situation is observed in the North China Craton, where metasedimentary rocks contain detrital igneous zircon grains with ages ranging from 3 to 2.1 Ga (Wan et al., 2006). All of these sedimentary units were subjected to Late Paleoproterozoic metamorphism. In the Siberian Craton, the Paleoproterozoic sedimentary deposits are possibly marked passive margins of the Early Precambrian crustal blocks, and their high-grade metamorphism was related to the consolidation of the Siberian Craton.  相似文献   

Influence of the Saharan Air Layer on Atlantic Tropical Cyclone Formation during the Period 1-12 September 2003     

潘维玉  吴立广 《大气科学进展》2011,(1)

Atmospheric Infrared Sounder (AIRS) data show that the Saharan air layer (SAL) is a dry, warm, and well-mixed layer between 950 and 500 hPa over the tropical Atlantic, extending westward from the African coast to the Caribbean Sea. The formations of both Hurricane Isabel and Tropical Depression 14 (TD14) were accompanied with outbreaks of SAL air during the period 1-12 September 2003, although TD14 failed to develop into a named tropical cyclone. The influence of the SAL on their formations is investigated ...  相似文献   

Sequence Characteristics of Foreland Basin and Its Difference from Those of Other Types of Basin     

纪友亮  潘春孚  周勇  朱如凯  高志勇  杨杰琦  于刚 《中国地质大学学报(英文版)》2011,(6)

Based on the case history study of sequence stratigraphic framework,sequence model,and the controlling factors on sequence formation in the southern Junggar foreland basin,a contrasting comparison of the characteristics among the foreland basin,the faulted basin,and the sag basin is made in the aspects of sequence architecture,filling style,the controlling factors on sequence development,the migrations of basin center and depocenter,etc..The current study results show that there are major differences and th...  相似文献   

Fluid Geochemical Features and Preservation Conditions of Marine Stratum in Typical Structure of Jianghan Plain Area     

徐国盛  龚德瑜  袁海锋  李昌鸿  王国芝  胡晓凤  林娟华  朱建敏 《中国地质大学学报(英文版)》2011,(6)

Many scholars carried out large quantity of researches on oil and gas preservative conditions of marine carbonate rocks from the aspects of cap rocks,faults,formation water,hydrodynamic,and tectonism.This article gives dynamic evaluation on oil and gas preservative conditions of marine stratum in Jianghan(江汉) plain of multiphase tectonic disturbance from the view of paleofluid geochemistry.The conclusion shows that there mainly existed fluid filling of two periods in the reservoir of Lower-Middle Triassic t...  相似文献   

曙光-雷家地区隐蔽油气藏及其成藏动力学特征     

赵会民  刘雪松  孟卫工  陈振岩  韩宏伟 《吉林大学学报(地球科学版)》2011,41(1):21-28

为深化辽河西部凹陷曙光—雷家地区隐蔽油气藏勘探,根据油气勘探研究成果,结合隐蔽油气藏的分类,将研究区的隐蔽油气藏划分为前新生代潜山油气藏和古近系特殊岩性体油气藏两类。其中:前新生代潜山油气藏包括太古宇潜山油气藏,中、上元古界潜山油气藏及中生界潜山油气藏;古近系特殊岩性体油气藏包括碳酸盐岩油气藏,火山角砾岩油气藏及玄武岩油气藏。在综合研究曙光—雷家地区的地质背景、油气成藏条件及成藏过程的基础上,认为该区具有形成隐蔽油气藏优越的地质条件,如多期的构造运动、复杂的构造背景、充足的油源条件、封闭性良好的盖层和畅通、多样的油气疏导体系等。基于成藏动力学系统理论,探讨了隐蔽油气藏的动力学特征,确定古近系特殊岩性体油气藏属于自源封闭型成藏动力学系统,前新生代潜山油气藏属于它源半封闭型成藏动力学系统。研究结果表明,这两类隐蔽油气藏具有匹配良好的生烃、储层、盖层、圈闭、运移、聚集的石油地质动力学特征。  相似文献   

应用地震属性分析研究十屋油田下白垩统营城组沉积体系分布   总被引：1，自引：0，他引：1  

李飞  程日辉  王共生  赵春满  李瑞磊  黄党委  王国栋 《吉林大学学报(地球科学版)》2011,(Z1):54-60

地震均方根振幅与岩石密度呈正相关,因此可以利用地震均方根振幅大小来识别岩性,判别岩相。在十屋工作区选择了16口钻遇营城组的钻井,对与切片对应的15 ms内的营城组岩性、岩相进行统计,分析统计了岩性、岩相与对应几种均方根振幅属性。根据均方根振幅颜色数值的大小,把均方根振幅等时切片上各点分成强、强-中、中-弱和弱4个等级。在均方根振幅等时切片上按照等级来划分区域。以地震响应特征对应的地质意义为依据,对划分区域的岩性、岩相进行预测。将本区岩性划分为砂岩、泥岩,岩相划分为三角洲相、扇三角洲相和湖泊相,并据此制作了研究区营城组沉积微相平面分布图,进而确定了研究区发育的4个沉积体系:西部沉积体系、东部沉积体系、东北部沉积体系和南部沉积体系。通过钻井验证了南部沉积体系的存在。  相似文献   

Estuarine refugia and fish responses to a large anoxic,hydrogen sulphide, “black tide” event in the adjacent marine environment     

S.J. Lamberth  G.M. Branch  B.M. Clark 《Estuarine, Coastal and Shelf Science》2010

The fish fauna of the Berg River Estuary was sampled from the mouth to 40 km upstream using a small-meshed seine-net before (summer 1993), during (summer 1994) and after (summer 1996) a low-oxygen, hydrogen sulphide “black tide” event that caused a mass mortality of fish in St Helena Bay. These data were compared to determine how the species composition, abundance and distribution of the fish fauna of the Berg River Estuary differed before, during and after the event as well as to ascertain which species, if any, found refuge in the estuary. The overall catch-per-unit-effort of 1637 fish.haul⁻¹ during the event was almost double the 932 fish.haul⁻¹ and 643 fish.haul⁻¹ in the years before and after respectively. All the fish recorded alive in the estuary during the event were species known to have some degree of estuarine association. No representatives of the purely marine species found dead on the adjacent shoreline were recorded live in the estuary during the event. Of the 10 estuarine-associated species sampled, 5 extended their range and/or modal peaks of abundance further upstream during the event. One species, Liza richardsonii, was abundant enough to examine its size distribution in different breaches of the estuary. Large/adult fish were concentrated further upstream than small/juvenile fish, which appeared to be unable to escape tidal currents and were concentrated at the edge of the low-oxygen front. Collectively this circumstantial evidence indicates that (1) fish used the Berg Estuary as a refuge from low-oxygen conditions in the marine environment during the “black tide” event, and (2) the ability to secure refuge in the estuary was restricted to species described as “estuarine-associated” or “estuarine-dependent”.  相似文献