Geochemistry

Geochemistry is a branch of geological sciences that deals with chemistry rocks and minerals in various igneous, metamorphic and sedimentary processes, from high to low temperatures and in various environments. Geochemistry is also an important background for a detailed description of rocks' origin and evolution. Geochemistry is also significant for other geological sciences, especially for dating various rock formations, geological processes and exploration of various mineral deposits. Geochemistry includes thirteen chapters that discuss the chemical composition of various rock complexes, their structural evolution, the methodology of specific geochemical methods (isotopic geology) and use of geochemical methods for the exploration of mineral deposits, structural geology, stratigraphy and lithology. Chapter 1, "Geochemistry of Granitic Rocks of the Moldanubian Batholith (Central European Variscides)," by Milo? René focuses on detailed geochemistry of four magmatic suites evolved in one of the largest plutonic complexes within the European Variscan Belt. Chapter 2, "An Overview on the Classification and Tectonic Setting of Neoproterozoic Granites of the Nubian Shield, Eastern Desert, Egypt," by Gaafar A. El Bahariya presents a comprehensive description of granitoid rocks exposed in the Eastern desert of Egypt and their geotectonic classification. Chapter 3, "Microstructure Features in Paleo and Neoproterozoic Granitic Rocks, Southeastern Region of Brazil," by Leonardo Gon?alves and Christiane Castro Gon?alves provides a mineralogical and microstructural description of granitic rocks exposed in the south-eastern region of Brazil, including detailed information on the geochemical evolution of feldspars during magmatic differentiation and high-temperature deformation. Chapter 4, "Deformation Features and Structures in Some Igneous and Metamorphic Rocks: A Case Study of Central African Fold Belt in Cameroon," by Benjamin Ntieche, Wokwenmendam Nguet, Zakari Nchouwet, Mahomed Azis Mounjouohou and Daouha Mfepat, is a detailed tectonic study of selected magmatic and metamorphic complexes in Central Africa. Chapter 5, "The Importance of Mechanical Transport, Rock Texture, and Mineral Chemistry in Chemical Weathering of Granites: The Melechov Massif, Czech Republic," by Václav Procházka, Miroslav ?á?ek, Petr Sulovský, Tomá? Vaculovi?, Lenka Rukavi?ková and Dobroslav Mat?jka describes the geochemical evolution of selected granitic rocks from the northern part of the Moldanubian batholith, Central European Variscan Belt, during their chemical weathering. The study also partly focuses on the fractionation of the rare-earth elements in these granites. Chapter 6, "Changes of Granite Rapakivi under the Biofouling Influence," by Dmitry Yu. Vlasov, Elena G. Panova, Marina S. Zelenskaya, Oksana A. Rodina, Alexey D. Vlasov and Katerina V. Sazanova is a detailed study of the influence of biochemical weathering on the destruction of rapakivi granite stones in several Russian and Finish cities. A significant part of this study presents the chemical composition of fresh rocks in comparison with the composition of crusts evolved during the biodegradation of these granitic rocks. Chapter 7, "Geochemistry of Radioactive Isotopes," by Salih Muhammad Awadh examines the geochemistry of selected isotopes of argon, carbon, kalium, neodymium, rubidium, samarium, strontium, uranium, and thorium, which are predominantly used to date magmatic, metamorphic and sedimentary rock complexes. The chapter also contains the basic characteristics of radioactivity, radioactive decay, and the methodology of rock dating. Chapter 8, "Exploration for Fe-Mn Oxides Using Geochemical Signatures in Soil: A Case Study of Part of Northwestern Nigeria," by Olufemi Sijuade Bamig