Fohn lamproite and a possible Late Eocene — pre-Miocene diatreme field, Northern Bonaparte Basin, Timor Sea
Titel:
Fohn lamproite and a possible Late Eocene — pre-Miocene diatreme field, Northern Bonaparte Basin, Timor Sea
Auteur:
Gorter, J. D. Glikson, A. Y.
Verschenen in:
Australian journal of earth sciences
Paginering:
Jaargang 49 (2002) nr. 5 pagina's 847-868
Jaar:
2002-10
Inhoud:
Seismic profiles in the Northern Bonaparte Basin, Timor Sea, northern Australia, disclose an east-northeast-trending 120 × 25 km swathe of over 40 circular to subcircular features excavated in the pre-Miocene erosional surface and buried by Lower Miocene sediments. The larger structures, typified by the Fohn Structure, include central structural highs overlying narrow vertical corridors of upward-bulging seismic horizons (bulge-forms). Associated with these structural highs are troughs that overlie broader vertical zones of slower seismic velocity (crater-form features). Smaller circular features (Dc 1100°C and pressures <0.1 GPa, followed by crystallisation of amphibole and phlogopite under water-saturated conditions at temperatures below ∼1020°C.
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