METEOR-L Device on the Lunar Orbital Vehicle Luna-26: Space Dust Detector     

Slyuta  E. N.  Vysochkin  V. V.  Ivanov  V. V.  Makovchuk  V. Yu.  Nazarov  A. I.  Pogonin  V. I.  Roskina  E. A.  Safronov  V. V.  Tatsiy  L. P. 《Solar System Research》2021,55(5):437-445

Solar System Research - The ionization-type cosmic dust detector METEOR-L is being developed for the lunar orbiter Luna-26 and is designed to study the distribution of meteoric bodies in space by...  相似文献   

Plant Steroid Hormones As Unique Constituents of Devonian Oils of Belarus     

Garetsky  R. G.  Gribik  Ya. G.  Litvinovskaya  R. P.  Savchuk  A. L.  Mardosevich  M. A.  Khripach  V. A. 《Doklady Earth Sciences》2020,494(1):688-690

Doklady Earth Sciences - The content of plant hormones (brassinosteroids) in oil samples from a number of oilfields in Belarus is determined using an enzyme immunoassay method. Brassinosteroids of...  相似文献   

Search for Evolutionary Changes in the Period the Cepheid ET Vul     

Berdnikov  L. N.  Pastukhova  E. N. 《Astronomy Letters》2020,46(4):235-244

Astronomy Letters - The reduction of all the available photometry for the Cepheid ET Vul has allowed its $$O-C$$ diagram spanning a time interval of 130 years to be constructed. This has made it...  相似文献   

Flexural deformation controls on Late Quaternary sediment dispersal in the Garo-Rajmahal Gap,NW Bengal Basin     

Jean-Louis Grimaud  Celine Grall  Steven Goodbred  Michael S. Steckler  Ryan Sincavage  Jennifer L. Pickering  Chris Paola  Leonardo Seeber  Md. Saddam Hossain 《Basin Research》2020,32(5):1242-1260

Subsurface deformation is a driver for river path selection when deformation rates become comparable to the autogenic mobility rate of rivers. Here we combine geomorphology, soil and sediment facies analyses, and geophysical data of the Late Quaternary sediments of the central Garo-Rajmahal Gap in Northwest Bengal to link subsurface deformation with surface processes. We show variable sedimentation characteristics, from slow rates (<0.8 mm/year) in the Tista megafan at the foot of the Himalaya to nondeposition at the exposed surface of the Barind Tract to the south, enabling the development of mature soils. Combined subsidence in the Tista fan and uplift of the Barind Tract are consistent with a N-S flexural response of the Indian plate to loading of the Himalaya Mountains given a low value of elastic thickness (15–25 km). Provenance analysis based on bulk strontium concentration suggests a dispersal of sediment consistent with this flexural deformation—in particular the abandonment of the Barind Tract by a Pleistocene Brahmaputra River and the current extents of the Tista megafan lobes. Overall, these results highlight the control by deeply rooted deformation patterns on the routing of sediment by large rivers in foreland settings.  相似文献   

Distribution of Polychaetes in the Laptev Sea and New Siberian Shoal and Its Relation with Environmental Factors     

Syomin  V. L.  Zimina  O. L. 《Oceanology》2020,60(3):316-330

Oceanology - In this paper, the distribution of polychaetes in the Laptev Sea and New Siberian shoal is analyzed based on 115 bottom trawl samples taken in August–October 2014. Polychaetes...  相似文献   

Recent Tectonic Rupturing on the Mud Volcano of Mount Karabetova,Taman Peninsula     

Ovsyuchenko  A. N.  Larkov  A. S.  Sysolin  A. I.  Rogozhin  E. A.  Sobisevich  A. L.  Chen  J.  Liu  J.  Qin  J. 《Doklady Earth Sciences》2020,492(1):361-365

Doklady Earth Sciences - In October 2019, extremely impressive, fresh ruptures of the surface on the mud volcano of Mount Karabetova were discovered. The ruptures are represented by all the main...  相似文献   

First Find of Platinum in Cosmogenic Spherules of Ferromanganese Crusts (Fedorov Guyot,Magellan Seamounts,Pacific Ocean)     

Savelyev  D. P.  Khanchuk  A. I.  Savelyeva  O. L.  Moskaleva  S. V.  Mikhailik  P. E. 《Doklady Earth Sciences》2020,491(2):199-203

Doklady Earth Sciences - More than 250 magnetic spherules 40–200 µm in size were mechanically separated from a ferromanganese crust sample of Fedorov Guyot in the Magellan Seamounts. The...  相似文献   

山东莱芜盆地碳酸盐岩热液溶蚀特征及水文地质意义   总被引：1，自引：0，他引：1  

刘元晴  周乐  李伟  王新峰  马雪梅  吕琳  邓启军  陈晨 《现代地质》2020,34(1):199-206

鲁中山区莱芜盆地在燕山期发生大规模岩浆侵入活动,岩浆岩体外围碳酸盐岩区分布有水源地、富水块段等岩溶发育富水区,且靠近岩体含水层多发生大理岩化。富含CO₂、H₂S等酸性成分的岩浆热液流体,能对碳酸盐岩产生明显的溶蚀作用。基于岩石样品化学组分分析、水文地质调查及数据统计分析、热液溶蚀地质点详细观测,构建热液溶蚀模式,对莱芜盆地及外围热液溶蚀特征及机理进行研究。结果表明:高温高压岩浆侵入使得接触带碳酸盐岩发生热液变质大理岩化;沿渗透性断裂、裂缝以及不整合面等运移的热液流体,对碳酸盐岩地层产生酸性热液溶蚀和混合溶蚀作用,形成不同规模溶蚀孔洞,构成地下水富集空间,为寻找城镇地下水后备水源地提供新方向。  相似文献   

Mixed sand–mud bedforms produced by transient turbulent flows in the fringe of submarine fans: Indicators of flow transformation     

Megan L. Baker  Jaco H. Baas 《Sedimentology》2020,67(5):2645-2671

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鄂尔多斯地块—扬子地块深部电性结构特征及其动力学意义     

吕宏斌  叶高峰  金胜  魏文博  董浩  张乐天  谢成良  尹曜田 《地质论评》2020,66(4):813-828

位于青藏高原东北缘的秦岭造山带在大地构造上南接扬子地块、北接华北地块,是特提斯构造域和古亚洲洋构造域的转换带。本文基于对一条起始于扬子地块,穿过秦岭造山带和鄂尔多斯地块,到达河套地堑的南北向大地电磁测深剖面的研究,探讨秦岭造山带和其北侧的鄂尔多斯地块、南侧的扬子地块之间的接触关系,以及青藏高原物质东北向逃逸等地学问题。对实测数据进行了张量阻抗分解和维性分析等工作,并对剖面进行了二维反演,获得岩石圈电性结构模型。根据电阻率模型认为:在秦岭造山带北部发现大规模"瓶颈状"分布的低阻异常体(C2),可能为华北、华南地块双向俯冲前缘地幔物质的上涌通道,或者是青藏高原中、下地壳物质沿秦岭造山带中构造薄弱位置向东逃逸的通道;在秦岭造山带和大巴山弧形带边界处发现南倾的低阻异常(C1),解释为大巴山弧形带北缘的逆冲断裂在电性上的反映;电性结构模型中,扬子地块高阻异常体(R2、R3和R4)向北倾斜至秦岭造山带下方,而北部鄂尔多斯地块的高阻异常体(R5和R6)向南倾斜至秦岭造山带下方;高阻异常通常被认为是稳定岩石圈的反映,据此推断这两组相向俯冲至秦岭造山带下方的高阻异常是华北地块和扬子地块向秦岭造山带下方汇聚的电性结构探测依据;鄂尔多斯地块南、北电性差异较大,北部中、下地壳大规模分布电阻率值在3～100Ω·m之间的低阻异常体,可能为地幔上涌导致的局部熔融或含盐流体共同作用的结果。  相似文献