Seismic reflection and refraction profiling across the Arunta Block and the Ngalia and Amadeus Basins

In order to investigate the tectonic evolution of the Arunta Block and the Ngalia and Amadeus Basins, a regional north‐south seismic reflection line 420 km long from the Northern Arunta Province to the southern part of the Amadeus Basin, and an east‐west refraction profile over 400 km within the Arunta Block, were recorded by the Bureau of Mineral Resources in 1985. The most significant basement features observed in the reflection data are prominent bands of northerly dipping reflections originating from beneath the Northern Arunta Province and the Ngalia Basin at times of between 4 and 10 s. In this region, reflected energy with frequencies as high as 100 Hz is present at two‐way times of 5–6 s, implying that the rocks have high Q to depths of at least 18 km. The character of the reflections changes markedly with varying frequency, which suggests that they arise by interference phenomena, probably associated with laterally varying lamellar structures. Deep crustal features on the reflection profiles from...

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