Eight new high-precision Pb/U CA-IDTIMS ages from the Bowen Basin are integrated with previous CA-IDTIMS ages to further the calibration of Lopingian sequences that record a period of climatic change, extensive volcanism and mass extinction. Numerous tuffs occur within the late Permian as the basin develops and shifts towards increasingly terrestrial sedimentation and coal measures which record a series of super-eruptions spanning c. 2.5 million years between ∼254 and 252 Ma. One, the Yarrabee Tuff, represents a basin-wide event that has been used as a correlative surface, previously dated at a number of locations as 252.88 ± 0.07 Ma. These correspond to the Eastern Australia magmatic arc flare-up peaking at c. 253 Ma. A new CA-IDTIMS age is reported from the (upper) Black Alley Shale, at 257.8 ± 1.2 Ma (upper Black Alley). The Wuchiapingian-Changhsingian Boundary is in the lower Black Alley Shale. The Black Alley Shale/Peawaddy boundary is marked by the Acritarch Acme Zone and “Mantuan Productus Beds” here dated to c. 254.5 Ma (latest Wuchiapingian). This level and age may also mark the termination of the P4 glaciation of the Late Paleozoic Ice Age. Our Fort Cooper Coal age of 256.0 ± 1.4 Ma is consistent with ages from the Peawaddy and Tinowan formations. The Platypus Tuff, dated 256.58 ± 0.73 Ma, is another basin-wide marker of mid-Wuchiapingian age and represents a major super-volcanic event. The top of the Ingelara Formation is dated by our age of 257.33 ± 0.52 Ma. The and palynozones are of late Changhsingian age. The Permian-Triassic Boundary is placed in the lower Rewan Group and within the lower Zone.

中文翻译：

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澳大利亚东部鲍文盆地高精度 CA-IDTIMS U-Pb 年代地层学，校准深层气候变化、超级火山活动和大规模灭绝


来自博文盆地的八个新的高精度 Pb/U CA-IDTIMS 年龄与之前的 CA-IDTIMS 年龄相结合，以进一步校准记录气候变化、广泛火山活动和大规模灭绝时期的洛平阶序列。随着盆地的发展并转向日益增加的陆地沉积和煤系，在二叠纪晚期出现了许多凝灰岩，记录了一系列跨越约1500年的超级喷发。大约 254 到 252 Ma 之间有 250 万年。其中一个是亚拉比凝灰岩，它代表了一个全盆地事件，已被用作相关表面，之前在许多地点的年代测定为 252.88 ± 0.07 Ma。这些对应于澳大利亚东部岩浆弧爆发的峰值，时间为c。 253 马。新的 CA-IDTIMS 年龄来自（上）Black Alley 页岩，为 257.8 ± 1.2 Ma（上 Black Alley）。五家坪系-长兴系界线位于Black Alley页岩下部。 Black Alley 页岩/Peawaddy 边界的标志是 Acritarch Acme 区域和此处的“Mantuan Productus 床”，其历史可追溯至公元 1977 年。 254.5 Ma（最近的五家坪阶）。这一水平和年龄也可能标志着晚古生代冰河期P4冰川作用的终止。我们的库珀堡煤年龄为 256.0 ± 1.4 Ma，与 Peawaddy 和 Tinowan 地层的年龄一致。鸭嘴兽凝灰岩的年代为 256.58 ± 0.73 Ma，是五家坪阶中期的另一个全盆地标志，代表了一次重大的超级火山事件。 Ingelara 地层顶部的年龄为 257.33 ± 0.52 Ma。孢粉带和孢粉带属于长兴纪晚期。二叠纪-三叠纪边界位于雷万群下部和下部地带内。