No abstract

No abstract

Energy nexus in synergy to SDGs; Sustainable energy supply Definition Energy nexus is a system-of-systems composed of one infrastructure system with the artifacts necessary to describe a full energy value chain and another infrastructure system with the artifacts necessary to describe a full value chain of another system. For example, energy and land nexus: The Energy nexus is a system-of-systems composed of energy infrastructure system with the artifacts necessary to describe a full energy value chain and land infrastructure system with the artifacts necessary to describe a full land value chain. Similarly, we can define the energy nexus with water, food, agriculture, etc., even the renewable and nonrenewable energy nexus.

No abstract

Clinopyroxene relict magmatic phases in Neoarchean Mangikhuta volcanics are described in detail in terms of their geochemistry for the first time, and their petrogenetic insights obtained. EPMA study indicates their restricted compositional range. Elemental variation diagrams show progressive variation of Al, Ca, Si, Fe+3, Ti, Cr, Aly and Aly/Alz, Ti/Al, Fe+2/Fe+3 elemental ratios with fractionation, which establishes their equilibrium conditions during crystallization differentiation. On pyroxene quadrilateral, they plot along fractionation trend of augite. Ca-Al Tschermak, esseneite and Tp are the “other components” in these clinopyroxenes. Progressive variation of other components indicates decrease of pH2O and fO2 of the magma during fractionation. Other components of clinopyroxenes and chondrite normalized whole rock REE patterns indicate minor fractionation of plagioclase in primitive magma. However, plagioclase became a major precipitating phase in later stage of fractionation. Clinopyroxene geobarometer and geothermometer indicate 0-3 kb pressure and 1100-12500 C temperature of crystallization of Mangikhuta clinopyroxenes. Mangikhuta complex have typically high normative orthopyroxene content (35–45 vol. %) now altered to Mg-Al-Fe chlorite. The Mangikhuta magma was highly aqueous and after genesis, it ascended rapidly giving rise to silica-aluminacalc-alkaline series rocks. In the late magmatic history, there was reaction between orthopyroxene and water and plagioclase and water so that Mg(Al, Fe)SiO3 pyroxene converted to Mg(Fe, Al) chlorite and prehnite.