(Table 1) Biostratigraphic datums of ODP Leg 133 sites@en

We use benthic foraminifers to reconstruct the Neogene paleobathymetric history of the Marion Plateau, Queensland Plateau, Townsville Trough, and Queensland Trough on the northeastern Australian margin (Ocean Drilling Program Leg 133). Western Queensland Plateau Site 811/825 (present depth, ~938 m) deepened from the neritic zone (0-200 m) to the upper bathyal zone (200-600 m) during the middle Miocene (~13-14 Ma), with further deepening into the middle bathyal zone (600-1000 m) occurring during the late Miocene (~7 Ma). A depth transect across the southern Queensland Plateau shows that deepening from the outer neritic zone (100-200 m) to the upper bathyal zone began during the latest Miocene (~6 Ma) at the deepest location (Site 813, present depth, 539.1 m), whereas the shallower Sites 812 and 814 (present depths, 461.6 and 520.4 m, respectively) deepened during the late Pliocene (~2.7 and ~2.9 Ma). At Marion Plateau Site 815 (present depth, 465.5 m), water depth increased during the late Miocene (~6.7 Ma) from the outer neritic to the upper bathyal zone. Nearby Site 816 (present water depth, 437.3 m) contains Pliocene upper bathyal assemblages that directly overlie middle Miocene shallow neritic deposits; the timing of the deepening is uncertain because of a late Miocene hiatus. On the northern slope of the Townsville Trough (Site 817, present depth, 1015.8 m), benthic foraminifers and sponge spicules indicate deepening from the lower upper bathyal (400-600 m) to the middle bathyal zone in the late Miocene (by ~6.8 Ma). Benthic foraminiferal faunas at nearby Site 818 (present water depth, 752.1 m) do not show evidence of paleobathymetric change; however, a late Pliocene (~2-3 Ma) increase in downslope transport may have been related to the drowning of the Queensland Plateau. Site 822 (present depth, 955.2 m), at the base of the Great Barrier Reef slope, deepened from the upper bathyal to the middle bathyal zone during the late Pliocene (by ~2.3 Ma). Queensland Trough Site 823 (present depth, 1638.4 m) deepened from the middle bathyal to the lower bathyal (1000-2000 m) zone during the late Miocene (~6.5 Ma). Benthic foraminiferal faunal changes at these Leg 133 sites indicate that rapid deepening occurred during […]本研究利用底栖有孔虫（benthic foraminifers）重建了澳大利亚东北缘马里恩高原（Marion Plateau）、昆士兰高原（Queensland Plateau）、汤斯维尔海槽（Townsville Trough）及昆士兰海槽（Queensland Trough）的新近纪（Neogene）古水深演化历史，数据来源于大洋钻探计划（Ocean Drilling Program, ODP）第133航次。昆士兰高原西部的811/825站位（现今水深约938 m）在中中新世（约13~14 Ma）期间，从浅海带（0~200 m）逐渐加深至上半深海带（200~600 m）；晚中新世（约7 Ma）期间进一步加深至中半深海带（600~1000 m）。跨越南部昆士兰高原的水深剖面显示，最深站位813（现今水深539.1 m）在晚中新世末期（约6 Ma）开始从外浅海带（100~200 m）向上半深海带加深；而水深较浅的812和814站位（现今水深分别为461.6 m和520.4 m）则在晚上新世（约2.7 Ma和2.9 Ma）期间发生加深。马里恩高原815站位（现今水深465.5 m）在晚中新世（约6.7 Ma）期间，水深从外浅海环境上升至上半深海带。邻近的816站位（现今水深437.3 m）发育有上新世上半深海有孔虫组合，其直接覆于中中新世浅海沉积之上；由于晚中新世存在沉积间断，该区域的加深时间尚不明确。汤斯维尔海槽北坡的817站位（现今水深1015.8 m）中，底栖有孔虫与海绵骨针（sponge spicules）证据显示，晚中新世（约6.8 Ma时）水深从下上半深海带（400~600 m）加深至中半深海带。邻近的818站位（现今水深752.1 m）的底栖有孔虫动物群未显示古水深变化迹象；但晚上新世（约2~3 Ma）期间的下坡搬运作用增强，可能与昆士兰高原的淹没作用有关。位于大堡礁斜坡基部的822站位（现今水深955.2 m）在晚上新世（约2.3 Ma时）从半深海带加深至中半深海带。昆士兰海槽823站位（现今水深1638.4 m）在晚中新世（约6.5 Ma）期间从中半深海带加深至下半深海带（1000~2000 m）。上述第133航次各站位的底栖有孔虫动物群变化表明，快速加深事件发生于[…]