TY - JOUR
T1 - The last lavas erupted during the main phase of the Siberian flood volcanic province
T2 - Results from experimental petrology
AU - Elkins-Tanton, Linda T.
AU - Draper, David S.
AU - Agee, Carl B.
AU - Jewell, Jessica
AU - Thorpe, Andrew
AU - Hess, P. C.
N1 - Funding Information:
Acknowledgments This study was supported by a grant from the National Science Foundation Petrology and Geochemistry program. The authors are very grateful for the support of and samples given by the American Museum of Natural History, Gerry Czamanske, Nick Arndt, and Valeri Fedorenko. The multi-anvil experiments were made possible by generous
PY - 2007/2
Y1 - 2007/2
N2 - The final lavas of the Siberian flood basalts are a ∼1,000 m thick section of meimechites, high-alkali, high-titanium, hydrous lavas that contrast sharply with the tholeiites that precede them. This paper presents a phase equilibrium study indicating that a candidate primary meimechite magma with 1 wt% water originated at ∼5.5 GPa and 1,700°C, both hotter and shallower than other estimates for melting beneath continental lithosphere. The experiments also suggest that a higher volatile content was involved in meimechite source genesis. Both the absence of orthopyroxene in any experiment and the close field association with carbonatites suggest that the meimechite source region may have been metasomatized with a CO2-rich fluid. A small additional quantity of CO2 and water would move magma origination to ∼1,550-1,600°C.
AB - The final lavas of the Siberian flood basalts are a ∼1,000 m thick section of meimechites, high-alkali, high-titanium, hydrous lavas that contrast sharply with the tholeiites that precede them. This paper presents a phase equilibrium study indicating that a candidate primary meimechite magma with 1 wt% water originated at ∼5.5 GPa and 1,700°C, both hotter and shallower than other estimates for melting beneath continental lithosphere. The experiments also suggest that a higher volatile content was involved in meimechite source genesis. Both the absence of orthopyroxene in any experiment and the close field association with carbonatites suggest that the meimechite source region may have been metasomatized with a CO2-rich fluid. A small additional quantity of CO2 and water would move magma origination to ∼1,550-1,600°C.
KW - Carbon dioxide
KW - Experimental petrology
KW - Meimechite
KW - Multiple saturation
KW - Siberian flood basalt
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U2 - 10.1007/s00410-006-0140-1
DO - 10.1007/s00410-006-0140-1
M3 - Article
AN - SCOPUS:33845899932
SN - 0010-7999
VL - 153
SP - 191
EP - 209
JO - Contributions to Mineralogy and Petrology
JF - Contributions to Mineralogy and Petrology
IS - 2
ER -