| Abratis, M., Viereck, L., Pfänder, J. A., & Hentschel, R. (2015). Geochemical composition, petrography and 40 Ar/39 Ar age of the Heldburg phonolite: implications on magma mixing and mingling. International Journal of Earth Sciences, 104(8), 2033-2055. Grant, T. B., Milke, R., Pandey, S., & Jahnke, H. (2013). The Heldburg Phonolite, Central Germany: Reactions between phonolite and xenocrysts from the upper mantle and lower crust. Lithos, 182, 86-101. Huckenholz, H. G., & WERNER, C. D. (1990). Die tertiären Vulkanite der Heldburger Gangschar (Bayerisch-thüringisches Grabfeld). Berichte der Deutschen Mineralogischen Gesellschaft, 1990(2), 1-42. Lippolt, H. J. (1982). K/Ar age determinations and the correlation of Tertiary volcanic activity in Central Europe. Geologisches Jahrbuch. Reihe D. Mineralogie, Petrographie, Geochemie, Lagerstättenkunde, (52), 113-135. |