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- W1014416916 abstract "The Ilímaussaq complex in South Greenland is a well-studied multiphase alkaline to peralkaline intrusion of MesoProterozoic age. Most of the Ilímaussaq rocks are extremely enriched in alkalis, iron, halogens, high-field-strength elements (HFSE) and other rare elements, forming one of the most differentiated peralkaline rock suites known. The major factors causing the extreme differentiation trends are low oxygen fugacity and silica activity as well as very low water activity in the melts. These inhibit the early exsolution of aqueous NaCl-bearing fluids and thereby facilitate the enrichment of alkalis and halogens in the melts, thereby increasing the solubility of HFSE. The unusually long crystallization interval of these rocks and the suspected continuous transition from melt to fluid results in extensive (auto)metasomatism and hydrothermal overprint. Primary mineral assemblages are therefore partially resorbed in most rock units and replaced by secondary minerals to various extents. The Ilímaussaq complex is a well-known example of magmatic layering in peralkaline plutonic rocks. Recent investigations on mineral chemical trends in the layered rocks permit better understanding of their formation. The mechanism of crystal mats formation in the cooling magma causing crowding effects during settling of the layering-forming minerals is believed to govern the formation of the Ilímaussaq layered sequence. Despite more than 100 years of research and hundreds of publications on Ilímaussaq, important aspects on the origin of some Ilímaussaq rocks, the architecture and deep structure of the complex and the significance of hydrocarbons and bitumens present in the peralkaline rocks remain unclear. Thus, plenty of room for further studies on these unusual rocks exists and interdisciplinary research is needed to better understand the genesis of this unique magmatic complex." @default.
- W1014416916 created "2016-06-24" @default.
- W1014416916 creator A5057276671 @default.
- W1014416916 creator A5069015609 @default.
- W1014416916 date "2015-01-01" @default.
- W1014416916 modified "2023-10-18" @default.
- W1014416916 title "The Ilímaussaq Alkaline Complex, South Greenland" @default.
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