Giant radiating mafic dyke swarm of the Emeishan Large Igneous Province: Identifying the mantle plume centre

Terra Nova ◽  
2015 ◽  
Vol 27 (4) ◽  
pp. 247-257 ◽  
Author(s):  
Hongbo Li ◽  
Zhaochong Zhang ◽  
Richard Ernst ◽  
Linsu Lü ◽  
M. Santosh ◽  
...  
Keyword(s):  
Mantle Plume ◽  
Large Igneous Province ◽  
Dyke Swarm ◽  
Mafic Dyke ◽  
Emeishan Large Igneous Province ◽  
Igneous Province ◽  
Mafic Dyke Swarm

scholarly journals The Okavango giant mafic dyke swarm (NE Botswana): its structural significance within the Karoo Large Igneous Province

2005 ◽  
Vol 27 (12) ◽  
pp. 2234-2255 ◽  
Author(s):  
Bernard Le Gall ◽  
Gomotsang Tshoso ◽  
Jérôme Dyment ◽  
Ali Basira Kampunzu ◽  
Fred Jourdan ◽  
...  
Keyword(s):  
Large Igneous Province ◽  
Dyke Swarm ◽  
Mafic Dyke ◽  
Igneous Province ◽  
Mafic Dyke Swarm ◽  
Structural Significance

scholarly journals Genesis of high-Ni olivine phenocrysts of the Dali picrites in the Central Emeishan large igneous province

2020 ◽  
pp. 1-10
Author(s):  
Wen-Chang Cai ◽  
Zhao-Chong Zhang ◽  
Jiang Zhu ◽  
M. Santosh ◽  
Rong-Hao Pan
Keyword(s):  
High Temperatures ◽  
Mantle Plume ◽  
Potential Temperature ◽  
Large Igneous Province ◽  
Thermal Plume ◽  
Emeishan Large Igneous Province ◽  
Igneous Province ◽  
High Concentrations ◽  
Mantle Potential Temperature

Abstract The Emeishan large igneous province (ELIP) in SW China is considered to be a typical mantle-plume-derived LIP. The picrites formed at relatively high temperatures in the ELIP, providing one of the important lines of argument for the role of mantle plume. Here we report trace-element data on olivine phenocrysts in the Dali picrites from the ELIP. The olivines are Ni-rich, and characterized by high (>1.4) 100×Mn/Fe value and low (<13) 10 000×Zn/Fe value, indicating a peridotite-dominated source. Since the olivine–melt Ni partition coefficient (KDNiol/melt) will decrease at high temperatures and pressures, the picrites derived from peridotite melting at high pressure, and that crystallized olivines at lower pressure, can generate high concentrations of Ni in olivine phenocrysts, excluding the necessity of a metasomatic pyroxenite contribution. Based on the Al-in-olivine thermometer, olivine crystallization temperature and mantle potential temperature (TP) were calculated at c. 1491°C and c. 1559°C, respectively. Our results are c. 200°C higher than that of the normal asthenospheric mantle, and are consistent with the role of a mantle thermal plume for the ELIP.

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