Geochronology,geochemistry and Hf isotopes of andesites in the Sandaowanzi gold deposit (Great Xing'an Range,NE China): implications for petrogenesis,tectonic setting,and mineralization

Acta Geochimica - The Sandaowanzi gold deposit is an extremely Au-rich deposit in the Northern Great Hinggan Range in recent years. Zircon U–Pb geochronology, Hf isotope analysis, and the...     

西准噶尔达尔布特蛇绿岩带萨尔托海岩体深部结构、构造特征:地质与地球物理证据

西准噶尔地区分布多条蛇绿混杂岩带,地表地质已有大量研究成果,但蛇绿岩深部结构构造研究相对薄弱,一定程度上制约了该地区地质构造演化的深入认识.为此,本文选取达尔布特蛇绿混杂岩带萨尔托海段开展了大比例尺地质填图配套地面重力、磁法和可控源音频大地电磁测深(CSAMT)等综合测量,获得了该蛇绿岩体地表分布、接触关系以及深部的磁性、密度结构和电性特征,精细刻画了蛇绿岩的深部结构与构造,并进一步分析了其侵位机制和动力学过程.萨尔托海蛇绿岩具有低重力、高磁性和变化范围较宽的电阻率值,岩体整体以构造岩块状产出,表现出挤压逆冲、走滑剪切、破碎蚀变等变形变质.本文及前人研究成果表明,萨尔托海岩体是在近东西向挤压兼走滑应力作用下以斜向楔冲形式构造就位,并进一步受到后期左行走滑和岩浆作用的叠加改造.结合区域构造演化,西准噶尔蛇绿岩的构造侵位与晚石炭世板块汇聚背景下残余洋盆的收缩有关,持续的挤压兼走滑应力使残余洋盆下伏基底蛇绿岩沿断裂构造侵位于上覆沉积地层.     

Sr Isotope Composition of Mud Volcanic Waters in the Kerch–Taman Province

Doklady Earth Sciences - Waters at seventeen mud volcanoes of the Kerch–Taman province in the Northwestern Cis-Caucasus region have been analyzed for Sr isotope composition. The 87Sr/86Sr...     

Nature And Age of Granites in the Central Part of the Western Siberian Platform (Case Study of the Krivolutskii Batholith)

Doklady Earth Sciences - The study of granites in the basement of the Western Siberian platform is highly relevant since they are associated with hydrocarbon deposits, which are located not only...     

Comparative Analysis of the Propagation Conditions of Millimeter Radio Waves at Radio Astronomy Polygons in Russia and Uzbekistan

Astronomy Reports - The feasibility of expanding the evaluation parameters was discussed when selecting the “Karadag” test site for the installation of millimeter-wave antennas based on...     

Analysis of Photoelectric Occultations and Development of a Digital Model of the Lunar Libration Zone

Astronomy Reports - One of the priority tasks of modern astronomy is the observation and study of transient celestial processes, which also concerns photoelectric observations of lunar occultations...     

Pb–Pb Age of Carbonate Rocks of the Kamo Group,Baikit Anteclise of the Siberian Platform

Doklady Earth Sciences - The first direct Pb–Pb dating of carbonate rocks of the Kamo Group has been carried out. The Pb–Pb age of carbonates of the lower units (the Madra, Jurubchen,...     

The Nature of Tungstenite of the Bystrinskoe Porphyry-Skarn Au–Fe–Cu Deposit (Eastern Transbaikalia,Russia)

Doklady Earth Sciences - Tungstenite of unusual shapes (spheroids, rings, threads, spirals, etc.) was found in scheelite of gold-bearing quartz–carbonate–pyrite–chalcopyrite...     

Dynamics of Dissolved Carbon in the Mainstem of the Lena River in July 2017

Doklady Earth Sciences - The dynamics of dissolved carbon forms in the waters of the mainstem of the Lena River from the middle reaches (the city of Yakutsk) to the nearshore zone of the Laptev Sea...     

Coexisting Tetrahedrite–(Zn) and Sphalerite at the Teremki Gold-Ore Deposit (East Transbaikalia): Chemical Composition and Formation Conditions

Geology of Ore Deposits - Paragenetic associations of tetrahedrite-(Zn) and sphalerite are distinguished in the Teremki gold-ore deposit. The chemical composition of coexisting minerals of this...