The Ebor Volcano in northeastern New South Wales is an eroded example of a central-type intraplate volcanic-intrusive
complex. It is of Miocene age (19-20 Ma) and has similarities to other central-type volcanoes in eastern Australia which
may represent manifestations of sub-lithospheric hotspot activity. Thick lava flows are exposed around the Great
Escarpment and are dominated by a tholeiitic basaltic suite, ranging from ol-tholeiite to qz-tholeiite to icelandite with ages
of 19.2-19.6 Ma. On its western edge, the tholeiitic lava suite probably overlies remnants of basanite flows belonging to
the Eocene (-48 Ma) Doughboy province, but elsewhere, minor alkaline basaltic lavas may be coeval with the tholeiitic
suite. Several felsic bodies were emplaced into the volcano at -19.0-19.2 Ma and include subalkaline and peralkaline
types. The Crescent Complex is a Miocene-age, strongly differentiated mafic to felsic intrusion in basement rocks and
centrally located in pre-erosion reconstructions of the Ebor Volcano. It is interpreted to be a major feeder for the tholeiitic
lavas based on age and composition. Evolution of the dominant tholeiitic suite proceeded from a parental ol-tholeiite
magma, through qz-tholeiite, icelandite and small volumes of felsic rocks by fractionation of plagioclase, olivine,
clinopyroxene and titanomagnetite, accompanied by enrichment of SiO2, F,FeO/MgO, alkalies and HFSE.