DOI: 10.1016/j.earscirev.2019.103041
论文题名: Neoproterozoic opening of the Pacific Ocean recorded by multi-stage rifting in Tasmania, Australia
作者: Mulder J.A. ; Everard J.L. ; Cumming G. ; Meffre S. ; Bottrill R.S. ; Merdith A.S. ; Halpin J.A. ; McNeill A.W. ; Cawood P.A.
刊名: Earth Science Reviews
ISSN: 00128252
出版年: 2020
卷: 201 语种: 英语
英文关键词: age determination
; cryogenic fluid
; Laurentia
; paleoenvironment
; Proterozoic
; provenance
; rifting
; tectonostratigraphy
; Australia
; Pacific Ocean
; Tasmania
英文摘要: The Tonian to Ediacaran geology of Tasmania, Australia preserves an extensive record of continental rifting related to the Neoproterozoic opening of the Pacific Ocean. We integrate new and previously published structural, stratigraphic, sedimentary provenance, age, and geochemical data to establish four tectonostratigraphic stages in Tasmania that formed during three episodes of Neoproterozoic rifting. Rift Event 1 initiated with Tonian (780–750 Ma) intraplate magmatism and clastic sedimentation and was followed by deposition of an eastward thickening and deepening succession of ≤ 780 Ma–730 Ma locally sourced siliciclastic strata and carbonate (tectonostratigraphic stage 1). Cryogenian glaciogenic strata and thick successions of mafic volcaniclastic turbidites (tectonostratigraphic stage 2) contain unimodal 670–640 Ma detrital zircon age populations and may record a second rift event (Rift Event 2). Final rifting (Rift Event 3) involved voluminous ca. 580 Ma basaltic volcanism and active extensional faulting (tectonostratigraphic stage 3) and was followed by latest Ediacaran to early Cambrian sag-phase deposition (tectonostratigraphic stage 4). Neoproterozoic rifting in Tasmania is broadly contemporaneous with punctuated Tonian to Ediacaran rifting along the paleo-margins of the Pacific Ocean in southeast Australia, East Antarctica, and western Laurentia. Rift Event 1 in Tasmania may record the rifting of Australia-Antarctica from western Laurentia to form the nascent Pacific Ocean. Geological correlations are consistent with models in which Tasmania remained attached to either eastern Australia-Antarctica or western Laurentia during the late Tonian and Cryogenian before being isolated as a microcontinent in the late Ediacaran during Rift Event 3. © 2019 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/166196
Appears in Collections: 气候变化与战略
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作者单位: School of Earth, Atmosphere and Environment, Monash University, Clayton, VIC 3800, Australia; Mineral Resources Tasmania, PO Box 56, Rosny ParkTAS 7018, Australia; ARC Centre of Excellence in Ore Deposits (CODES), School of Natural Sciences, University of TasmaniaTAS 7001, Australia; Laboratoire de Géologie de Lyon, Université Claude Bernard Lyon 1, Lyon, 69622, France; Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, TAS 7001, Australia
Recommended Citation:
Mulder J.A.,Everard J.L.,Cumming G.,et al. Neoproterozoic opening of the Pacific Ocean recorded by multi-stage rifting in Tasmania, Australia[J]. Earth Science Reviews,2020-01-01,201