DOI: 10.1016/j.epsl.2018.04.036
Scopus记录号: 2-s2.0-85046627461
论文题名: A petrochronological approach for the detrital record: Tracking mm-sized eclogite clasts in the northern Canadian Cordillera
作者: Kellett D.A. ; Weller O.M. ; Zagorevski A. ; Regis D.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 494 起始页码: 23
结束页码: 31
语种: 英语
英文关键词: Canadian Cordillera
; detrital record
; eclogite
; petrochronology
; rutile U–Pb
; thermobarometry
Scopus关键词: Geochronology
; Oxide minerals
; Silicate minerals
; Tectonics
; Titanium dioxide
; Zircon
; Canadian Cordillera
; Detrital records
; Eclogites
; petrochronology
; Thermobarometry
; Metamorphic rocks
; barometry
; clast
; detrital deposit
; eclogite
; Mesozoic
; rutile
; thermochronology
; thermometry
; uranium-lead dating
; Canada
; Canadian Cordillera
英文摘要: Sutures recording the accretion history of the Canadian Cordillera terranes are poorly preserved. The Whitehorse trough syn-orogenic basin formed during early Mesozoic terrane accretion at the western margin of Laurentia and contains a ∼300 m thick horizon that includes eclogite clasts possibly sourced from a suture zone. By applying petrochronological micro-analytical techniques to the mm-diameter eclogite clasts, including thermobarometry and in situ rutile thermochronology, as well as detrital zircon geochronology and thermal diffusion modeling, we constrain a source-to-sink path for the clasts. The eclogite clasts likely reached peak metamorphic conditions of 2.2–2.9 GPa and ≥800 °C, cooled through Pb closure in rutile during Early Jurassic at ≥610 °C and were deposited into the basin by latest Pliensbachian/earliest Toarcian. This history implies minimum mean cooling and exhumation rates on the order of ∼38 °C/myr and ∼4.1 km/myr, respectively, consistent with rates reported for subduction-related eclogite worldwide. We suggest the most likely source for the clasts is the suture between the Yukon–Tanana and Stikinia terranes, involving a latest Triassic collision, followed by rapid Early Jurassic exhumation of the lower plate Yukon–Tanana terrane, either by buoyant extrusion or in a plate boundary zone metamorphic core complex. Our study demonstrates that micro-analytical techniques used for petrochronology can be applied to very small lithic clasts in the sedimentary record towards the tectonic reconstruction of accretionary orogens. © 2018 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109854
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Geological Survey of Canada, 1 Challenger Dr., Dartmouth, Nova Scotia B2Y 4A2, Canada; Geological Survey of Canada, 601 Booth St., Ottawa, Ontario K1A 0E8, Canada; Department of Earth Sciences, University of Cambridge, Cambridge, CB2 3EQ, United Kingdom
Recommended Citation:
Kellett D.A.,Weller O.M.,Zagorevski A.,et al. A petrochronological approach for the detrital record: Tracking mm-sized eclogite clasts in the northern Canadian Cordillera[J]. Earth and Planetary Science Letters,2018-01-01,494