评述“前陆盆地”名词在中国中西部含油气盆地中的引用——反思中国石油构造学的发展   总被引：22，自引：5，他引：17  

罗志立  刘树根 《地质论评》2002,48(4):398-407

“前陆盆地”一词,在中国中西部含油气盆地研究中被许多学者广泛引用,在空间上有“泛前陆盆地化”,在地史演化中有“扩大化”,名词术语引用上有“复杂化”的倾向,因而引起同行的关注。本文从文献中追踪前陆盆地原命名者的涵义和沿革,正确理解国外学者提出前陆盆地的特及模式,再根据中国的实际地质特征与国外典型前陆盆地对比,结果发现我国中西部前陆盆地的特殊在于大国外所称的前陆盆地的共同性。因而认为在中国中西部直接引用“前陆盆地”一词不当。建议采用“陆内俯冲型前陆盆地”（Intracontinental subduction foreland basin）一(间称－C型前陆盆地）,以示有中国地质特色的前陆盆地,为今后建立油气成藏模式和指导油气勘探理论依据。最后,还讨论了中国石油学发展中,值得反思的3个问题。  相似文献   

小麦品种对禾谷缢管蚜抗性的多目标评价及抗性因素分析     

郭良珍  刘绍友 《广东海洋大学学报》2000,20(2):40-44

用多目标层次加权法评价了 8个小麦品种对禾谷缢管蚜的综合抗性 ,结果表明 ,8个小麦品种的抗蚜性强弱依次为 W6 (4 0 ) 2、小偃六号、NWAU34- 9、陕 16 7、陕 80 0 7、85(6 7) 2 4、81(2 8) 2 8、85(6 7) 15。抗性因素的分析表明 ,品种感蚜值与游离氨基酸总量呈负相关 ,在 17种游离氨基酸中 ,感蚜值与赖按酸和精氨酸的含量显著负相关 ,而与总糖含量呈正相关  相似文献   

内蒙古林西地区上二叠统林西组沉积环境与演变   总被引：1，自引：0，他引：1       下载免费PDF全文

翟大兴  张永生  田树刚  吴非蒙  邢恩袁  王猛  施立志  王卓卓 《古地理学报》2015,17(3):359-370

内蒙古东部林西地区上二叠统林西组沉积环境存在争议。鉴于此,笔者在前人研究基础上,通过详实的野外观测与室内鉴定,依据古生物、沉积构造与岩相、地球化学等资料,对林西组沉积环境进行研究;从钙藻、苔藓虫、海绵等海相生物化石、B/Ga值、碳氧同位素和沉积结构构造等方面,认为林西组主体为海相,存在海陆过渡相。林西组沉积环境可划分为三角洲前缘、滨海、浅海和半深海。生物礁主要为蓝绿藻粘结礁和藻粘结骨架礁,指示滨海—浅海环境。林西组沉积环境主要经历了滨海、半深海、三角洲前缘、浅海和滨海的演变,沉积盆地演化分为抬升—断陷—快速充填—稳定沉陷—稳定充填5个阶段。  相似文献   

88小时:美国地质调查局国家地震信息中心对2011年3月11日Mw9.0日本地震的响应     

Gavin P Hayes  Paul S Earle  Harley MBenz  David J Wald  Richard W Briggs  左玉玲 《国际地震动态》2011,(8):1-15

引言 2011年3月11日日本本州岛东海岸附近海域发生的M9．0地震（Tohoku earthquake,以下称“东日本大地震”——译者注）及其引发的海啸造成数以万计的人员死亡,造成的财产损失可能超过1万亿美元,这是有历史记录以来最严重的自然灾害之一。  相似文献   

Selected Trace Elements in Snowpack on Urumqi Glacier No. 1, Eastern Tianshan, China: As Yielded by Leaching Treatment Representative of Real-World Environmental Conditions     

张明军  王圣杰  王飞腾  李月芳 《中国地质大学学报(英文版)》2011,(4)

To investigate the seasonal variability and potential environmental significance of trace elements in mountain glaciers, the surface snow and snow pit samples were collected at Urumqi Glacier No. 1 (43o06'N, 86o49'E, 4 130 m a.s.l.), eastern Tianshan (天山), from September 2002 to September 2003, and analyzed for Li, V, Cr, Mn, Co, Cu, and Ba. The samples were acidified (leached) in a manner intended to reasonably approximate the extent to which the natural hydrologic and weathering cycles would liberate elem...  相似文献   

Rapid Shrinking of Glaciers in the Middle Qilian Mountain Region of Northwest China during the Last ～50 Years     

王璞玉  李忠勤  高闻宇 《中国地质大学学报(英文版)》2011,(4)

During the past five decades, fluctuations of glaciers were reconstructed from historical documents, aerial photographs, and remote sensing data. From 1956 to 2003, 910 glaciers investigated had reduced in area by 21.7% of the 1956 value, with a mean reduction for the individual glacier of 0.10 km2. The relative area reductions of small glaciers were usually higher than those of large ones, which exhibited larger absolute loss, indicating that the small glaciers were more sensitive to climate change than la...  相似文献   

The light curve of the semiregular variable L₂ Puppis – I. A recent dimming event from dust     

T. R. Bedding  A. A. Zijlstra  A. Jones  F. Marang  M. Matsuura  A. Retter  P. A. Whitelock  I. Yamamura 《Monthly notices of the Royal Astronomical Society》2002,337(1):79-86

The nearby Mira-like variable L₂ Pup is shown to be undergoing an unprecedented dimming episode. The stability of the period rules out intrinsic changes to the star, leaving dust formation along the line of sight as the most likely explanation. Episodic dust obscuration events are fairly common in carbon stars but have not been seen in oxygen-rich stars. We also present a 10-μm spectrum, taken with the Japanese Infrared Telescope in Space satellite, showing strong silicate emission that can be fitted with a detached, thin dust shell, containing silicates and corundum.  相似文献   

Galactic cosmic-ray anisotropy and its heliospheric modulation, inferred from the sidereal semidiurnal variations observed in the rigidity range 300–600 GV with multidirectional muon telescope at Sakashita underground station     

K. Nagashima  K. Fujimoto

I. Morishita 《Planetary and Space Science》1991,39(12):1637-1655

The existence of sidereal semidiurnal variation of cosmic-ray intensity in a rigidity region 10²-10³ GV has been reported by many researchers, but there is no consensus of opinion on its origin. In this paper, using the observed semidiurnal variations in a rigidity range (300–600 GV) with 10 directional muon telescopes at Sakashita underground station (geog. lat. = 36°, long. = 138°E, DEPTH = 80 m.w.e.), the authors determine the magnitudes (η₁, η₂) and directions (a₁, a₂) of the first- and second-order anisotropies in the following galactic cosmic-ray intensity distribution (j) , where P_nis the nth order spherical function and χ_n is the pitch angle of cosmic rays with respect to a_n. For the determination, the influence of cosmic-ray's heliomagnetospheric modulation, geomagnetic deflection and nuclear interaction with the terrestrial material and also of the geometric configuration of the telescopes are taken into account. Usually, the semidiurnal variation is produced by the second-order anisotropy. The present observation, however, requires also the first-order anisotropy which usually produces only the diurnal variation, but can produce also the semidiurnal variation as a result of the heliospheric modulation. The first- and second-order anisotropies are characterized with η₁) > 0 and η₂ < 0 have almost the same direction (a₁ a₂) specified by the right ascension ( 0.75 h) and declination (δ 50°S) and, therefore, they can be expressed, as a whole, by an axis-symmetric anisotropy of loss-cone type (i.e. deficit intensities in a cone). It is noteworthy that this anisotropy approximately coincides with that inferred from the air shower observation at Mt Norikura in the rigidity region 10⁴ GV.  相似文献   

Factors Affecting Long-term Trends in the Estuarine Abundance of Pogge (Agonus cataphractus )     

Agonus cataphractus 《Estuarine, Coastal and Shelf Science》2002,54(6):941

Long-term data assembled from a power station on the Thames estuary were used to model fluctuations in the abundance of pogge (Agonus cataphractus) as a function of estuarine environmental, seasonal and prey availability variables using multiple regression. Temperature was the most important determinant of abundance, with seasonal variables and changes in the relative abundance of age-0 dab, Limanda limanda, possibly as prey, also holding important consequences for pogge abundance. Pogge abundance was also moderately influenced by: salinity, flow, salinity-flow interactions, changes in the relative abundance of Dover sole, Solea solea, and a trend variable. Regular patterns of seasonal (spring/winter) occurrences were associated with the use of warmer estuarine waters to optimize growth and reproductive potential and/or correlated with inshore spawning migrations and the availability of prey species. Both mechanisms suggest opportunistic use of estuarine habitats by pogge. Available temperature-abundance relationships further suggest a well-defined estuarine thermal niche, with an optimum at 9·5 °C. There remains a requirement for improved information on the biology of pogge and factors governing the population dynamics of this important estuarine species.  相似文献   

Galaxy formation using halo merger histories taken from N-body simulations     

John C. Helly _&#;  Shaun Cole  Carlos S. Frenk  Carlton M. Baugh  rew Benson  Cedric Lacey 《Monthly notices of the Royal Astronomical Society》2003,338(4):903-912

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