Geochemical Constraints on the Mantle Source of the Upper Permian Emeishan Continental Flood Basalts, Southwestern China

CA-TIMS zircon U–Pb dating of felsic ignimbrite from the Binchuan section: Implications for the termination age of Emeishan large igneous province

“…The Emeishan lava succession comprises predominantly basaltic lavas and pyroclastic deposits, with minor amounts of picrite and basaltic andesite (Chung and Jahn, 1995;Song et al, 2001;Xu et al, 2001). In the eastern part of the Emeishan LIP, the succession clearly rests on the Middle Permian carbonates of the Maokou Formation and is directly overlain by the Upper Permian terrestrial clastic rocks of the Xuanwei Formation and the marine clastic rocks of the Longtan Formations (Jin and Shang, 2000).…”

Magnetostratigraphic constraints on two‐stage eruptions of the Emeishan continental flood basalts

“…[2] The Middle to Upper Permian Emeishan continental flood basalts in southwestern China and northern Vietnam form a major part of the Emeishan large igneous province (ELIP) [e.g., Lin, 1985;Zhang et al, 1988;Chung and Jahn, 1995;Song et al, 2001aSong et al, , 2001bAli et al, 2005;Xu et al, 2008;Ukstins Peate and Bryan, 2008], which covers an area of 0.5 × 10 6 km 2 [Xiao et al, 2004] from the eastern margin of the Tibetan Plateau to the western margin of the Yangtze block. Geochemical studies reveal the characteristic temporal and spatial distributions of high-Ti (HT) and low-Ti (LT) basalts in the ELIP, where the dominant low-Ti basalts with low Ti/Y (<500) and "Nd(t) (−0.34 ∼ −3.76) erupted earlier than the high-Ti basalts with high Ti/Y (>500) and "Nd(t) (−1.17 ∼ 0.43), as they occur in the lower section in the western part of the ELIP, whereas the subordinate high-Ti basalts are distributed in both the upper sections of the western part, and uniformly in the eastern part of the ELIP [Xu et al, 2001;Xiao et al, 2004].…”

Igneous Rock Associations 16. The Late Permian Emeishan Large Igneous Province

“…The early themes of Emeishan basalt studies focused on their division into high-and low-Ti groups and their spatial-temporal distribution (Xu et al 2001;Song et al 2001;Xiao et al 2004;He et al 2010;Lai et al 2012). The division into 'high-Ti' and 'low-Ti' groups corresponded to a petrological distinction as the 'high-Ti' (i.e.…”

“…evidence for uplift) are giving way to new and alternative ideas. There are ongoing debates regarding the source of the flood basalts, the formation of the oxide-ore deposits and whether crustal doming occurred prior to volcanism (Xu et al 2001Song et al 2001;He et al 2003;Zhou et al 2005;Utskins Peate and Bryan 2008;Sun et al 2010;Zhong et al 2011, Shellnutt andJahn 2011;Kamenetsky et al 2012).…”