浊积岩和砂质碎屑流岩关键识别标志及辽河盆地岩心实例^*          下载免费PDF全文

杨棵  朱筱敏  刘宇  刘兴周  郭峰 《古地理学报》2020,22(3):483-492

重力流是自然界中广泛存在的一种流体形式,不同学者基于不同切入点往往会提出多种重力流的划分方案。采用浊流和碎屑流的二分方案,对浊积岩和砂质碎屑流岩的沉积特征展开综述和探讨,旨在进一步概括这2类岩石的沉积特征,明确具有指示意义的最典型相标志。研究表明,在野外露头和钻井岩心中,可以通过以下典型特征鉴别浊积岩和砂质碎屑流岩: 砂岩内若发育以正粒序为特征的递变层理,则应该将其认定为浊积岩;若砂岩内发育泥岩撕裂屑、漂浮状泥砾或不含任何层理构造(块状砂岩),则应该将其认定为砂质碎屑流岩。这些特征是鉴别浊积岩和砂质碎屑流岩最可靠的标志。此外,变形层理、爬升波纹交错层理、波状层理、平行纹层、冲刷侵蚀界面、岩性突变界面和槽模等沉积构造也具有一定指示意义,出现这些特征时需要结合沉积背景、岩相的垂向组合关系和地球物理等资料进行综合判断。  相似文献   

Geochemical Indicators of “Camouflaged” Pyroclastic Material in the Upper Jurassic–Lower Cretaceous Deposits of the Eastern Russian Platform     

Zorina  S. O.  Nikashin  K. I.  Sokerin  M. Yu. 《Doklady Earth Sciences》2020,493(2):608-611

Doklady Earth Sciences - Based on the results of studying the lithological–geochemical features of the Upper Jurassic–Lower Cretaceous mudrocks and black shales in the Eastern Russian...  相似文献   

Index Minerals of the Hydrothermal Arsenide Process of the Formation of Cobalt Deposits of the Bou Offro–El Graara Ore Belt in the Anti-Atlas Province,Morocco     

Lebedev  V. I.  Kalinin  Yu. A. 《Geology of Ore Deposits》2020,62(6):457-479

Geology of Ore Deposits - The distribution of index minerals of the hydrothermal arsenide process of the formation of Ni‒Co–As (±U–Ag), Co–S–As...  相似文献   

A motion planning algorithm for the feed support system of FAST     

姚蕊  姜鹏  孙京海  于东俊  孙纯 《天文和天体物理学研究(英文版)》2020,(5):117-126

The paper relates to a motion planning algorithm for the feed support system of the Five-hundred-meter Aperture Spherical radio Telescope(FAST).To enhance the stability of the feed support system,the start/termination planning segments are adopted with an acceleration and deceleration section.The source switching planning adopts a combination of a line segment and focal segment to realize stable control of the feed support system.Besides,during the observation trajectory,a transition segment which is not used for observation data is planned with a required time.Through an example simulation,a smooth change is realized via the motion planning algorithm and presented in this paper.  相似文献   

西昌市泸山地区典型火后泥石流特征与成因机制研究——以响水沟左岸3^#支沟为例     

铁永波  徐如阁  刘洪  王家柱  巴仁基  向安平  杨剑  欧阳渊  张玙  王宏 《中国地质调查》2020,7(3):82-88

2020年3月30日,四川省凉山州西昌市经久乡发生森林大火,山火燃烧后形成的山火灰和烧焦土体在强降雨作用下极易启动形成泥石流,给西昌市泸山、琼海景区生态环境及当地百姓生命财产安全带来潜在地质灾害风险。以西昌市安哈镇响水沟左岸3^#支沟为例,采用野外调查、无人机航拍、地球物理探测、现场及室内实验等手段,对2020年5月1日该沟发生的火后泥石流流体特征、动力学参数及成因机制等开展研究,系统分析了山火及降雨过程对该次火后泥石流形成的影响机制。该成果可为系统认识西昌泸山“3·30”山火地区火后泥石流的运动特征、物源规模、激发雨量及其发展趋势研判提供科学参考。  相似文献   

The MIRS Microwave Radiometer–Spectrometer as the Basis for the Convergence Space Experiment     

Sadovsky  I. N.  Kuzmin  A. V.  Khapin  Yu. B.  Kozlova  T. O. 《Izvestiya Atmospheric and Oceanic Physics》2020,56(12):1741-1750

Izvestiya, Atmospheric and Oceanic Physics - The MIRS microwave radiometer–spectrometer is described. The instrument is being developed using a conceptual design that was the first stage of...  相似文献   

Using Models of the Deep Structure of the Earth’s Crust and Upper Mantle Based on GOCE Gravity Data in Metallogenic Analysis     

Volkov  A. V.  Galyamov  A. L.  Savchuk  Yu. S. 《Izvestiya Atmospheric and Oceanic Physics》2020,56(12):1528-1536

Izvestiya, Atmospheric and Oceanic Physics - Gravimetric data obtained by the GOCE spacecraft contributes to the development of global models of the deep structure of the Earth’s crust and...  相似文献   

Uranium-Lead and Lu–Hf Isotope Systematics of Zircon and Sm–Nd Isotopes in Rocks of the Dyumtaley Ore-Bearing Intrusion (Taimyr,Russia): New Evidence for the Role of the Depleted Mantle in Its Genesis     

Malitch  K. N.  Lokhov  D. K.  Proskurnin  V. F.  Puchkov  V. N.  Badanina  I. Yu.  Chervyakovskaya  M. A. 《Doklady Earth Sciences》2020,492(1):346-350

Doklady Earth Sciences - This study utilized SHRIMP, LA MC–ICP–MS and ID-TIMS analytical techniques and presents for the first time U–Pb age, Lu-Hf-isotope features of zircon and...  相似文献   

Strong-Earthquake-Prone Areas Recognition Based on an Algorithm with a Single Pure Training Class: I. Altai–Sayan–Baikal Region, М ≥ 6.0     

Dzeboev  B. A.  Gvishiani  A. D.  Belov  I. O.  Agayan  S. M.  Tatarinov  V. N.  Barykina  Yu. V. 《Izvestiya Physics of the Solid Earth》2019,55(4):563-575

Izvestiya, Physics of the Solid Earth - A new version of the Barrier algorithm is proposed for recognition of strong-earthquake prone regions based on training over a single reliable training...  相似文献   

Study of subsurface eddy properties in northwestern Pacific Ocean based on an eddy-resolving OGCM     

Xu  Anqi  Yu  Fei  Nan  Feng 《Ocean Dynamics》2019,69(4):463-474

Ocean Dynamics - A method based on the Okubo–Weiss parameter was used to detect subsurface eddies (SSEs) with an eddy-resolving ocean general circulation model. Statistical analyses showed...  相似文献