FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W4376868082> ?p ?o ?g. }

• W4376868082 abstract "Abstract In many alkaline complexes, large amounts of ultramafic rocks occur together with carbonatites, melilitolites and other alkaline silicate rocks. There is an ongoing debate if and how these contrasting lithologies were formed by differentiation of a common, mantle-derived silicate magma or rather by metasomatic processes between carbonatite and country rocks. In order to find petrological evidence for one or the other, two key examples, the Gardiner (E Greenland) and Kovdor (Russia) complexes are compared in this study. Despite their similar tectonic setting and succession of rock types, they show significant differences in the texture and mineral composition of ultramafic rocks. Ultramafic rocks from Kovdor include calcite- and biotite-rich dunites and pyroxenites without typical cumulate textures. They consist of Ni-poor forsterite, Cr-poor diopside and Ni-Cr-poor spinel and are possibly metasomatic reaction products between mantle-derived carbonatite melts and silicic host rocks. Similar ultramafic rocks are associated with carbonatites e. g. at Palabora (South Africa), Afrikanda (Russia), and Salitre (Brazil). In contrast, the ultramafic rocks from Gardiner show well-preserved cumulate textures and consist of Ni-rich forsterite, Cr-rich diopside as well as Cr-Ni-Ti-rich spinel and also contain F-Cl-rich apatite. They record an increase in aSiO2 from dunite to pyroxenite at similar fO2 (ΔFMQ ~ +1.2, with FMQ = fayalite-magnetite-quartz buffer), indicating that these rocks represent cumulates of an evolving, moderately oxidized mafic melt derived from a Ti-rich mantle source, similar to other rocks of the North Atlantic igneous province. In contrast to systems like Kovdor where carbonatite metasomatism is likely dominant, Ti-rich parental silicate magmas can abundantly crystallize Ti phases, as recorded by massive perovskite cumulates in Gardiner melilitolites. This can effectively scavenge HFSE from the magmatic system early in its evolution and likely explains HFSE-barren carbonatites at Gardiner, while those from Kovdor are highly HFSE-enriched. In summary, the results of our study provide strong textural and mineral chemical evidence that ultramafic rocks in alkaline complexes can be of both cumulate and metasomatic origin; the specific type has an important bearing on their HFSE enrichment and on the types of ores present in such complexes." @default.
• W4376868082 created "2023-05-18" @default.
• W4376868082 creator A5007298813 @default.
• W4376868082 creator A5024616951 @default.
• W4376868082 creator A5046758332 @default.
• W4376868082 creator A5057276671 @default.
• W4376868082 creator A5069015609 @default.
• W4376868082 creator A5090611870 @default.
• W4376868082 date "2023-05-17" @default.
• W4376868082 modified "2023-09-29" @default.
• W4376868082 title "The Origin of Ultramafic Complexes with Melilitolites and Carbonatites: A Petrological Comparison of the Gardiner (E Greenland) and Kovdor (Russia) Intrusions" @default.
• W4376868082 cites W1523608885 @default.
• W4376868082 cites W1621677047 @default.
• W4376868082 cites W1621974787 @default.
• W4376868082 cites W1622919140 @default.
• W4376868082 cites W1641367876 @default.
• W4376868082 cites W1739474197 @default.
• W4376868082 cites W1830358639 @default.
• W4376868082 cites W1972375976 @default.
• W4376868082 cites W1974100576 @default.
• W4376868082 cites W1975632341 @default.
• W4376868082 cites W1979679477 @default.
• W4376868082 cites W1979707930 @default.
• W4376868082 cites W1991937965 @default.
• W4376868082 cites W1993790463 @default.
• W4376868082 cites W1995446222 @default.
• W4376868082 cites W1996561698 @default.
• W4376868082 cites W2000752984 @default.
• W4376868082 cites W2002142838 @default.
• W4376868082 cites W2002271865 @default.
• W4376868082 cites W2003460360 @default.
• W4376868082 cites W2016123227 @default.
• W4376868082 cites W2018736696 @default.
• W4376868082 cites W2020726550 @default.
• W4376868082 cites W2023843330 @default.
• W4376868082 cites W2028305063 @default.
• W4376868082 cites W2034131792 @default.
• W4376868082 cites W2035045796 @default.
• W4376868082 cites W2035283420 @default.
• W4376868082 cites W2041921292 @default.
• W4376868082 cites W2042278293 @default.
• W4376868082 cites W2046069468 @default.
• W4376868082 cites W2050757096 @default.
• W4376868082 cites W2050805293 @default.
• W4376868082 cites W2052159407 @default.
• W4376868082 cites W2055289543 @default.
• W4376868082 cites W2057322342 @default.
• W4376868082 cites W2065261863 @default.
• W4376868082 cites W2066025606 @default.
• W4376868082 cites W2076146440 @default.
• W4376868082 cites W2076736899 @default.
• W4376868082 cites W2082455005 @default.
• W4376868082 cites W2098958698 @default.
• W4376868082 cites W2099048351 @default.
• W4376868082 cites W2106837803 @default.
• W4376868082 cites W2109495971 @default.
• W4376868082 cites W2113167188 @default.
• W4376868082 cites W2113799613 @default.
• W4376868082 cites W2116709280 @default.
• W4376868082 cites W2120561922 @default.
• W4376868082 cites W2120727828 @default.
• W4376868082 cites W2132428772 @default.
• W4376868082 cites W2139237062 @default.
• W4376868082 cites W2140218018 @default.
• W4376868082 cites W2141890535 @default.
• W4376868082 cites W2142676355 @default.
• W4376868082 cites W2155146104 @default.
• W4376868082 cites W2157057679 @default.
• W4376868082 cites W2157086512 @default.
• W4376868082 cites W2158273116 @default.
• W4376868082 cites W2165623492 @default.
• W4376868082 cites W2167291234 @default.
• W4376868082 cites W2171968174 @default.
• W4376868082 cites W2179766178 @default.
• W4376868082 cites W2503296409 @default.
• W4376868082 cites W2505229739 @default.
• W4376868082 cites W2566386328 @default.
• W4376868082 cites W2567621441 @default.
• W4376868082 cites W2600861237 @default.
• W4376868082 cites W2614672254 @default.
• W4376868082 cites W2732333591 @default.
• W4376868082 cites W2737208103 @default.
• W4376868082 cites W2767767549 @default.
• W4376868082 cites W2770420352 @default.
• W4376868082 cites W2790623589 @default.
• W4376868082 cites W2790833716 @default.
• W4376868082 cites W2799744306 @default.
• W4376868082 cites W2885665353 @default.
• W4376868082 cites W2887299262 @default.
• W4376868082 cites W2900617984 @default.
• W4376868082 cites W2925089675 @default.
• W4376868082 cites W2945603303 @default.
• W4376868082 cites W2954427977 @default.
• W4376868082 cites W2998460188 @default.
• W4376868082 cites W3003464332 @default.
• W4376868082 cites W3016779516 @default.
• W4376868082 cites W3043501399 @default.
• W4376868082 cites W3091575314 @default.
• W4376868082 cites W3098583463 @default.
• W4376868082 cites W3170192967 @default.

• next