L048 Southern Surat Basin seismic reflection and refraction survey, QLD, 1961

During 1961 in the southern part of the Surat Basin a seismic party from the Bureau of Mineral Resources surveyed two main traverses by means of seismic reflection and refraction methods; the first was in an east-west direction between Yelarbon and St George and the second was in a north-south direction between Meandarra and Nome. The main purposes of the survey were to find whether the Bowen Basin Permian sediments extend as far south as the latitude of Goondiwindi and whether the Bowen Basin in Queensland and the Sydney Basin in New South Wales formed a continuous region of sedimentation during the Permian period. The east-west seismic traverse indicated a trough of sediments of greatest thickness,tabout 14,800 ft beneath Toobeah; the trough is bounded on the eastorn side at Goondiwindi by a fault down-thrown more than 7000 ft to the west and is bounded on the western side by a series of step.-faults beneath Bungunya and Talweod. The results along the north-south traverse indicated that the trough beneath Meandarra, which represents the southern extension of the Bowen Basin, continues south to Toobeah. The nature of the link, if any, between the Bowen Basin and the Sydney Basin was not established. On the eastern side of the Surat Basin, seismic results indicated that the rocks beneath the Mesozoic sediments are stratified and probably metamorphic. A shelf area between Talweod and St George has about 6000 ft of sediments above a Drobablo metamorphic 'basement'. An anticlinal structure with a dip-reversal of about 1000 ft throw was located between Goondiwindi and Toobeah.

1961年，矿产资源局（Bureau of Mineral Resources）的地震勘探队在苏拉特盆地（Surat Basin）南部开展作业，采用地震反射与折射法完成了两条主要测线的勘测：第一条为东西向测线，连接耶拉邦（Yelarbon）与圣乔治（St George）；第二条为南北向测线，连接米安达腊（Meandarra）与诺姆（Nome）。本次勘测的核心目标为验证两项科学问题：其一，鲍恩盆地（Bowen Basin）的二叠纪沉积物是否延伸至冈迪温迪（Goondiwindi）所在纬度以南；其二，昆士兰州境内的鲍恩盆地与新南威尔士州境内的悉尼盆地（Sydney Basin）在二叠纪时期是否为连续的沉积区域。东西向地震测线显示，图比亚（Toobeah）下方存在一处最大厚度约14800英尺（ft）的沉积槽；该沉积槽东侧以冈迪温迪处的断层为界，该断层向西的下降盘位移量超过7000英尺；西侧则以布贡亚（Bungunya）与塔尔韦德（Talweod）下方的一系列阶梯状断层为界。南北向测线的勘测结果表明，米安达腊下方的沉积槽（对应鲍恩盆地的南部延伸区域）向南一直延伸至图比亚一带。鲍恩盆地与悉尼盆地之间的关联（若存在的话）的本质仍未明确。在苏拉特盆地东侧，地震勘测结果显示，中生代沉积物下方的岩层呈层状结构，且大概率为变质岩。塔尔韦德与圣乔治之间的陆架区域，在疑似变质的基底之上覆盖有约6000英尺厚的沉积物。在冈迪温迪与图比亚之间，发现了一处倾角反转断距约1000英尺的背斜构造。