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Alkaline rocks and their economic and geodynamic significance through geological time
No full textAlkaline igneous rocks have a relative excess of alkalis over silica. Most are silica undersaturated and contain normative nepheline and real feldspathoids (nepheline, leucite). Although alkaline rocks make up only about 1% of total igneous rocks by volume, their diverse mineralogy accounts for 90% of all igneous rock names proposed by the IUGS. They occur in all tectonic settings; in the ocean basins and on the continents, along mid-ocean ridges (rare), on oceanic islands, in subduction zones in the oceans and along continental margins, as well as along rift zones. Alkaline rocks commonly include alkali basalts and foidites, tephrites, phonolites, trachytes and their intrusive equivalents, including lamprophyres and carbonatites. In the literature, a plethora of local names for alkaline rocks from different localities have been created and many geoscientists still consider them as petrological curiosities. However, their study can significantly aid the interpretation of mantle evolution, ancient terranes and their geodynamic settings. Additionally, alkaline rocks may host world-class precious- and rare-metal mineralization. During recent years, the exploration interest in critical and rare metal deposits (Nb, rare earth elements (REEs) and Th) has increased dramatically as they represent vital resources for the so-called ‘green energy transition’. This Special Publication presents new comprehensive data, results and findings on alkaline rocks from different terranes worldwide and uses their mineralogy and geochemical fingerprints in order to elucidate their petrogenesis, tectonic settings and mineralization potential. This volume is not only of interest for igneous petrologists, but also for exploration geologists prospecting for precious- and rare-metal mineralization worldwide
The Question of Land and Infrastructure Development in India: Urgently Required Reforms for Fairness and Infrastructural Development
No full textLand in India is problematic largely because of archaic and perverse provisions in the practice and the law. The new Land Acquisition Amendment Bill does go some way to correct the anti-democratic and imperial provisions of the old 1894 Act. Other regulatory restraints stand in the way of fair compensation to sellers whether the deal is a sale or an acquisition using eminent domain. Urban planning being based on the “Ricardian Model” and on top of asymmetrically applied regulatory constraints further depresses the benefit to land owners. As a result very little land is obtainable without dispute and high risk for infrastructure development. In this paper we provide an analytical critique of the law and restrictions as also of the framework of urban planning and provide a justification for why major change is required in the approach to land markets, land acquisition and urban planning. We also provide the key elements of a reformed approach that can create a win-win framework for development. We also present our suggestions on how the proposed Amendment to the Land Acquisition Act can be changed to make the Act functional and remove the residual perversities therein.
Microbial Extraction of Uranium from Ores
No full textCONTENTS
3.1 Introduction
3.2 Uranium Leaching Methodologies
3.2.1 Chemical Leaching
3.2.2 Bioleaching
3.3 Modes and Mechanism of Uranium Bioleaching
3.3.1 Direct Mechanism
3.3.2 Indirect Mechanism
3.3.3 Bioleaching by Heterotrophs
3.4 Factors Influencing Bioleaching
3.4.1 Mineralogy of the Ore
3.4.2 Microorganisms
3.4.3 Temperature
3.4.4 pH
3.4.5 Nutrients and Energy Source
3.4.6 Importance of Iron Oxidation
3.4.7 Sulphur Reduction
3.5 Bioleaching Techniques
3.5.1 Laboratory Investigations
3.5.1.1 Submerged Leaching
3.5.1.2 Column/Percolation Bioleaching
3.5.2 Large Scale/Industrial Operations
3.5.2.1 Dump Leaching
3.5.2.2 Heap Leaching
3.5.2.3 In Situ Leaching
3.5.2.4 Tank Leaching
3.6 Bioleaching of Uranium in the Indian Scenario.
3.7 Conclusions
Reference
Directive speech acts in the New Testament
No full textDanuta Pytel-Pandey, WrocławThis article discusses the directive speech acts in the New Testament. The
author presents examples of such acts from the New Testament Scriptures, and
then carries out their pragmalinguistic [email protected]
Nature Trails, botanical bookworks by Radha Pandey
No full textSarah Bodman interviews book artist Radha Pandey about her botanical bookworks and establishing Halden Bookworks, a new book arts centre in Halden, Norway
Hydrological Changes in the Arctic, the Antarctic, and the Himalaya
No full textThe chapter enumerates the importance of glaciers on global climate, livelihood, economics, and their hydrological implications. Climate warming has raised an alarming signal on water reserves, especially on Earth's cryosphere that acts as hydrological insurance for glacier-fed rivers and a key driver for the ocean ecosystem through their freshwater supply and salinity regulation. Key issues have been discussed to understand the cryosphere system and its effect on the hydrological systems
Spontaneous Flora on Post-industrial Metalliferous Sites
No full textPandey VC, editor. Biodiversity and Ecosystem Services on Post‐Industrial Land. John Wiley and Sons; 2024. p. 53-95
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