Geochemistry and petrogenesis of basalts from the West Siberian Basin: an extension of the Permo–Triassic Siberian Traps, Russia

Triggers of Permo-Triassic boundary mass extinction in South China: The Siberian Traps or Paleo-Tethys ignimbrite flare-up?

“…Although no consensus has been reached so far on the causal mechanisms, the~250 Ma Siberian Traps is widely believed to be the ultimate cause of PTB mass extinction due to the coincidence of these two events (e.g., Campbell et al, 1992;Courtillot, 1994;Courtillot and Renne, 2003;Kamo et al, 2003Kamo et al, , 2006Racki and Wignall, 2005;Reichow et al, 2002;Renne et al, 1995). However, two potential pitfalls are associated with this methodology/reasoning: (a) If the two events took place at the same time, they are possibly but not necessarily related to each other.…”

Petrogenises of Triassic gabbroic and basaltic rocks from Chukotka, NE Russia: Eastern end of the ‘arc–type’ Siberian LIP?

“…Hydrous nature. The presence of hydrous minerals is reported from several localities of Siberian LIP: amphibole and biotite in Noril'sk I intrusion (Renne 1995), biotite in meimechite from Maymecha-Kotuy region (Fedorenko and Czamanske 1997); biotite in the olivine gabbro from west Siberian basin (Reichow et al, 2002); biotite in dolerite sills of Angara-Taseevskaya (Ivanov 2007); amphibole and biotite in the dolerite of New Siberian Islands (Kuz'michev and Pease 2007). However, it is important to note that amphibole is rarely a phenocryst in arc basalts (Davidson et al, 2007) and their scarcity can be attributed to its instability at low pressures (e.g., Rutherford and Devine, 1988;Romick et al, 1992).…”

“…The high-Ti series rocks (e.g., meimechites; Arndt et al, 1998;Sobolev et al, 2009) are volumetrically insignificant and commonly display OIB-type geochemical features. The IAB-type geochemical feature of the low-Ti basalts of Siberian LIP are traditionally attributed to a fingerprint of lithospheric contamination (Lightfoot et al, 1993;Reichow et al, 2005). However, the presence of strong arc-type geochemical signatures and primary magmatic waterbearing minerals in the low-Ti series rocks of Siberian LIP (Reichow et al, 2002;Ivanov 2007) indicate that contamination of lithospheric mantle cannot be the controlling factor.…”

“…The IAB-type geochemical feature of the low-Ti basalts of Siberian LIP are traditionally attributed to a fingerprint of lithospheric contamination (Lightfoot et al, 1993;Reichow et al, 2005). However, the presence of strong arc-type geochemical signatures and primary magmatic waterbearing minerals in the low-Ti series rocks of Siberian LIP (Reichow et al, 2002;Ivanov 2007) indicate that contamination of lithospheric mantle cannot be the controlling factor. Therefore, the dominant IAB-type, low-Ti basalts within the Siberian LIP have been attributed to wet mantle upwelling, driven by dehydration of the Mongolia-Okhotsk oceanic slab at the mantle transition zone (Ivanov and Litasov, 2014).…”

Geochemistry of basaltic flows from a basalt ring structure of the Serra Geral formation at Água Vermelha dam, Triângulo Mineiro, Brazil: implications for the magmatic evolution of the Paraná-Etendeka Province

“…10C) is a characteristic chemical signature for some continental flood basalt (e.g., Arndt & Christensen 1992, Pik et al 1999, reflecting the source composition and melt conditions (Turner & Hawkesworth 1995). The PEMP model for melt generation suggests the partial fusion of peridotite on the subcontinental lithospheric mantle (SCLM), chemically modified due to previous subduction processes which generated the negative Nb anomaly (Turner et al 1996, Reichow et al 2005, Wang et al 2008.…”