globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2020.116071
论文题名:
Timing and causes of the mid-Cretaceous global plate reorganization event
作者: Olierook H.K.H.; Jourdan F.; Whittaker J.M.; Merle R.E.; Jiang Q.; Pourteau A.; Doucet L.S.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 534
语种: 英语
中文关键词: 40Ar/39Ar geochronology ; eastern Gondwana ; Neotethys ; slab pull ; subduction ; Wharton Basin
英文关键词: Feldspar ; Geochronology ; Intelligent systems ; Timing circuits ; eastern Gondwana ; Neotethys ; Slab pull ; subduction ; Wharton Basin ; Monte Carlo methods ; argon-argon dating ; continental breakup ; Cretaceous ; Gondwana ; slab ; subduction zone ; Tethys ; Australia ; Indian Ocean ; Wharton Basin
英文摘要: Global plate reorganization events (GPREs) can have profound impact on plate velocities, climate and the biotic cycle but the timing and triggers for GPREs remain debated. The timing and causes of the mid-Cretaceous GPRE, one of only two GPREs since the breakup of Pangea, remains poorly constrained because it occurred during the Cretaceous Normal Superchron. Here, we provide a new plagioclase 40Ar/39Ar age of 103.82±0.54 Ma (2σ) at DSDP site 256 along the world's clearest curved fracture zones in the Wharton Basin, off NW Australia. Using Monte Carlo simulations, we compute that the mid-Cretaceous GPRE commenced at 111.2−1.2 +1.3 Ma (95% confidence). The mid-Cretaceous GPRE was associated with a significant plate deceleration (minimum ∼26%), similar to the Eocene GPRE, implying that this process is fundamental to plate reconfigurations. We propose that the mid-Cretaceous GPRE was caused by slab-breakoff and cessation of the south-dipping subduction zone in the Mesotethys Ocean at ca. 111 Ma. Ultimately, we posit that subduction zone initiations and cessations are the primary triggers for both post-Pangean GPREs and that top-down processes may be the fundamental drivers for GPREs. © 2020 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165195
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作者单位: School of Earth and Planetary Sciences, Curtin University, GPO Box U1987, Perth, WA 6845, Australia; John de Laeter Centre, Curtin University, GPO Box U1987, Perth, WA 6845, Australia; Centre for Exploration Targeting – Curtin Node, Curtin University, GPO Box U1987, Perth, WA 6845, Australia; Western Australian Argon Isotope Facility, Curtin University, GPO Box U1987, Perth, WA 6845, Australia; Institute for Marine and Antarctic Studies, University of Tasmania, Private Bag 129, Hobart, Tasmania 7001, Australia; Swedish Museum of Natural History, Stockholm, S-104 05, Sweden; Earth Dynamics Research Group, ARC Centre of Excellence for Core to Crust Fluid Systems (CCFS), Curtin University, GPO Box U1987, Perth, WA 6845, Australia

Recommended Citation:
Olierook H.K.H.,Jourdan F.,Whittaker J.M.,et al. Timing and causes of the mid-Cretaceous global plate reorganization event[J]. Earth and Planetary Science Letters,2020-01-01,534
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