U-Pb Laser Ablation Inductively Coupled Mass Spectrometry (U-Pb La-Icp-Ms) Zircon Age Constraints on the Tectonic Origin of the Avalon Terrane in Southeastern New England

Ellison, Sonia; Kuiper, Yvette D.; Crowley, Jim; Murray, Daniel P.

doi:10.1130/abs/2019am-338684

Geological Society of America Abstracts With Programs

2019

DOI: 10.1130/abs/2019am-338684

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U-Pb Laser Ablation Inductively Coupled Mass Spectrometry (U-Pb La-Icp-Ms) Zircon Age Constraints on the Tectonic Origin of the Avalon Terrane in Southeastern New England

Sonia Ellison¹,

Yvette D. Kuiper²,

Jim Crowley³

et al.

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Tonian–Ediacaran tectonomagmatic evolution of West Avalonia and its Ediacaran–early Cambrian interactions with Ganderia: an example of complex terrane transfer due to arc–arc collision?

Staal

Barr

McCausland

et al. 2020

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The Neoproterozoic tectonomagmatic evolution of West Avalonia comprises four major events. Tectonism started with the formation of a Tonian passive margin on a Baltica-derived ribbon dispersed into the Mirovoi Ocean. Obduction of an oceanic terrane onto the ribbon produced olistostromes, deformation and metamorphism before 750 Ma. Obduction was followed by a Tonian (750–730 Ma) arc on the created composite crust. A pause in magmatism between 730 and 700 Ma is the next event. Subsequently, a Cyrogenian (700–670 Ma) arc was formed, which may have collided with Baltica or another buoyant element nearby. Thereafter, a long-lasting (640–565 Ma) continental arc was erected which, combined with the late Ediacaran–Early Paleozoic sedimentary cover, represents the hallmark of West Avalonia. A Caribbean-style incursion of the Ediacaran arc into the widening Tornquist gap between Amazonia and Baltica led to a diachronous collision with the Ganderian arc. Strike-slip slivering produced a complex transfer of terranes to both: Carolinia and smaller terranes to Ganderia, and East Avalonia to West Avalonia. The Rheic Ocean opened diachronously at c. 500 Ma, following a plate reorganization and re-establishment of an oblique subduction zone beneath Amazonia. As a result, Avalonia and Ganderia became progressively separated and dispersed into the Iapetus Ocean.

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Tonian–Ediacaran tectonomagmatic evolution of West Avalonia and its Ediacaran–early Cambrian interactions with Ganderia: an example of complex terrane transfer due to arc–arc collision?

Staal

Barr

McCausland

et al. 2020

View full text Add to dashboard Cite

show abstract

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U-Pb Laser Ablation Inductively Coupled Mass Spectrometry (U-Pb La-Icp-Ms) Zircon Age Constraints on the Tectonic Origin of the Avalon Terrane in Southeastern New England

Cited by 1 publication

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Tonian–Ediacaran tectonomagmatic evolution of West Avalonia and its Ediacaran–early Cambrian interactions with Ganderia: an example of complex terrane transfer due to arc–arc collision?

Tonian–Ediacaran tectonomagmatic evolution of West Avalonia and its Ediacaran–early Cambrian interactions with Ganderia: an example of complex terrane transfer due to arc–arc collision?

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