Olivine in ultramafic lamprophyres: chemistry, crystallisation, and melt sources of Siberian Pre- and post-trap aillikites

Aillikites and Alkali Ultramafic Lamprophyres of the Beloziminsky Alkaline Ultrabasic-Carbonatite Massif: Possible Origin and Relations with Ore Deposits

“…carbonatite to 42 wt% SiO2 (close to ijolites) ( Figure 9, Table S2). The variations of SiO2 and major elements are similar to aillikites of Labrador [7,13,57] and other regions such as the Tomtor massif [6,47,58,59], Chadobets uplift [31,33], Scotland [23], Greenland [20,27] and Eastern India [28]. The average aillikite composition from 232 samples worldwide [1] practically coincides with the composition of some aillikites from BZM but many of the latter are richer in alkalis and Al2O3 (higher modal proportion of Phl.…”

“…There are several carbonatite ultramafic complexes in the marginal zones of the Siberian craton [6,21,25,33,[47][48][49][50][51][52] (Figure 1) One of the interesting objects with the complex plume-subduction nature is the Beloziminsky massif (BZM) [34][35][36][37][38][39][40][41][42][43][44][45][46] which has various metallogenic specialization in Ta, Nb, REE and P, and a wide range of components including Th and U. It was involved in exploration despite its distant location (140 km) from the railway.…”

“…The series of the ultramafic alkaline carbonatite complexes in Central Asia [33][34][35][36][37][38][39][40][41][42][43][44][47][48][49][50][51][52] and worldwide [26][27][28][29] often contain lamprophyres sometimes close to aillikites [1,2].…”

“…In Siberia, aillikites were discovered in the Chadobets uplift [30] and in the Tomtor carbonatite massif [33]. We also checked the series of alkaline lamprophyres rocks in dykes and necks in and near the Beloziminsky massif (BZM) [34][35][36][37][38][39][40][41][42][43][44][45][46] in the foothills of the Eastern Sayan mountains and found that they are typical aillikites, but were previously described by alnöites [34][35][36][37] and melilitites [42].…”

Os distintos tipos petrográficos da intrusão Kimberlítica Pântano, Província Alcalina Alto Paranaíba (MG): evidências de um sistema magmático aberto

“…Para o kimberlito Limeira I, foram descritos xenólitos do manto de até 15 cm com composição de dunito, harzburgito e espinélio lherzolito (Svisero & Ulbrich, 1992;Almeida, 2009), em parte portadores de flogopita (Meyer et al, 1991 Howarth and Taylor, 2016), lamproítos (Jaques & Foley, 2018;Shaik et al, 2018) e lamprófiros ultramáficos (Nosova et al, 2018;Tappe et al, 2006;Veter et al, 2017).…”