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Qingjie Gong and Zeming Shi Special Issue on New Advances and Illustrations in Applied Geochemistry in China Jie Li, Bimin Zhang, Qingjie Gong, Hanliang Liu and Ningqiang Liu Microscopic Morphology and Indicative Significance of Nanoscale Au Particles in Soils and Fault Muds: A Case Study of Jiaojia, Shandong Province Ming Kang, Huanzhao Guo, Wende Zhu, Xianrong Luo and Jianwen Yang The Improvement and Application of the Geoelectrochemical Exploration Method Bing Zhou, Zhixue Zhang, Zeming Shi, Hao Song and Linsong Yu
This is a book about the why and how of doing experiments on rocks, minerals, magmas, and fluids. It could have as logically been subtitled "Experimental petrology" as "Experimental geochemistry," but we chose geochemistry to emphasize the broad and overlapping nature of current experimental work. We have tried to aim the book at a general readership which we hope will include advanced undergraduate students, graduate students, and anyone else interested in learning something about experimental petrology.
Although the ocean covers more than two thirds of the Earth's surface, the processes of accumulation of sediments on the seafloor have been insufficiently studied. For many years, the efforts of researchers were concentrated on the study of the continents. By studying sediments in various parts of the oceans in space and in time, I will attempt to establish the processes governing the formation of sediments in the oceans as a whole. The present monograph is my second book on the subject of the formation and accumulation of oceanic deposits. In 1972, a book entitled Sedimentation in the ff/orM
Geochemistry is the chemistry of the natural environment and it encompasses the earth as well as other Solar System bodies, what Antoine Lavoisier described as “the grand laboratory of nature.” A complete definition might be that geochemistry applies chemistry to understanding the earth and its cosmic environment and using that understanding to better the human condition.
FOREGS (Forum of European Geological Surveys) Geochemical Baseline Programme has been initiated to provide high quality environmental geochemical baseline data for Europe. The data will be based on samples of stream water, stream sediment, floodplain sediment, soil, and humus collected all over Europe. High quality and consistency of the obtained data are ensured by using standardised sampling methods and by treating and analysing all samples in the same laboratories. This programme represents the European contribution to the International Union of Geological Sciences (IUGS)/ International Association of Geochemistry and Cosmochemistry (IAGC) Working Group on Global Geochemical Baselines. The sampling instructions are based on the recommendations of the IGCP 259 and IGCP 360 programmes. The present report contains comprehensive instructions for sample site selection and sample collection. In addition, a summary of methods intended for sample preparation and analysis is included.
THE fascinating problem of the origin of liquid petroleum, with which we must associate natural gas, mineral waxes, and asphaltic materials, is primarily of interest to geologists and chemists, but its solution would have a wider impact, since it would throw some light on certain aspects of the early history of the earth and the first steps in the evolution of living forms.
All major Appalachian tectonostratographic zones in Gaspesie, Quebec and New Brunswick (i.e. Humber, Dunnage, Gander, and Avalon) are intruded by Paleozoic granites. Granite petrological and geochemical data assist in evaluating the economic potential of the plutons and provide insight into the crustal and tectonic evolution of the orogen. Based on Na2O and Al index values (generally >3.2 wt.% and <1.1 respectively) and high-field strength element contents, most of the granites are 1-types; some have "А-type affinities". Granite chemical and isotopic characteristics distinguish three contrasting groups of granites: Humber-Dunnage, Gander, and Avalon. Positive eNd values for Humber, Dunnage, and Avalon granites indicate melting of predominately juvenile sources. Negative e Nd and elevated 201РЫШРЬ and 518 values for Gander granites are consistent with reworking of older (1.1-1.8 Ga) crust containing a significant supracrustal component. Neodymium isotopic data effectively rules out Grenville basement as a source for Humber-Dunnage granites. Gander zone is apparently the autochthonous surface expression of a distinct lower crustal block. Contrasting e Nd signatures from Avalon and Gander granites indicates that Gander and Avalon zones are underlain by different crustal blocks, i.e. Precambrian Avalon basement is not a suitable protolith for Gander granites.<...>
Исследованиями последних лет установлена прямая связь между образованием месторождений различных полезных ископаемых и поствулканическими процессами, т. е. процессами, протекающими в областях действия вулканов. Этим исследованиям посвящены новейшие работы французских, японских, американских и новозеландских геологов, вошедшие в сборник. Материалы сборника содержат большое количество фактических данных о вулканических газах, водах и геохимии связанных с ними' элементов, раскрывают представления зарубежных геологов о механизме поствулканического процесса и дают возможность советским специалистам ознакомиться с теорией и практикой исследования современных вулканических областей мира. Учитывая огромный интерес, который вызывает у советских геологов проблема промышленного использования тепловых ресурсов действующих вулканов, выход в свет настоящего сборника представляется весьма современным. Сборник рассчитан на студентов и преподавателей геологических вузов и геологических факультетов университетов, на специалистов-геологов, ведущих поиски полезных ископаемых, геохимиков и вулканологов.
Before discussing the geochemical techniques applied in the exploration and exploitation of geothermal resources, it is convenient to recall few general concepts. Geothermal energy is the natural heat of the earth, which is transferred towards the surface through conductive and convective processes. Because of these processes, the temperature within the earth crust generally increases with depth of ∼30 °C/km.