Ordovician ocean plate stratigraphy and thrust duplexes of the Ballantrae Complex, SW Scotland: Implications for the pelagic deposition rate and forearc accretion in the closing Iapetus Ocean

Fujisaki, Wataru; Asanuma, Hisashi; Suzuki, Kuninori; Sawaki, Yusuke; Sakata, Shuhei; Hirata, Takafumi; Maruyama, Shigenori; Windley, Brian F.

doi:10.1016/j.tecto.2015.04.014

Cited by 16 publications

(12 citation statements)

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“…This relatively imprecise date was well within error of both the graptolite biostratigraphy and the Arenig age confirmed by the chert's radiolarian fauna (Aitchison 1998). More detailed follow-up work then produced a series of much more closely constrained dates that were linked by Fujisaki et al (2015) to three tuff horizons within the chert succession (Fig. 3).…”

Section: Volcanogenic Zircons In Tuff At Bennane Leamentioning

confidence: 55%

“…The distribution of U-Pb ages for the zircon populations in two sandstone interbeds were illustrated by Fujisaki et al (2015, fig. 10 therein); the zircons were thought to be derived from island arc volcanicity.…”

Section: Detrital Zircons In Sandstone At Bennane Leamentioning

confidence: 99%

“…This reversal was ascribed either to soft sediment deformation prior to or during thrust imbrication, or to subsidiary thrust relationships within each of the defined duplexes. The tight folding seen at Bennane Lea may also be a factor but was not invoked as a potential explanation by Fujisaki et al (2015). Irrespective of the details, and whether syn-sedimentary or tectonic disruption is preferred, the range of dates has wider implications at both its older and younger ends.…”

Section: Volcanogenic Zircons In Tuff At Bennane Leamentioning

confidence: 99%

“…If the Craighead lavas and cherts are assigned to the Ballantrae Complex, only a relatively short time interval remains between their accumulation and their structural incorporation into the obducted ophiolite. This problem has been recently accentuated by the U-Pb ages of detrital zircon in volcaniclastic sandstone and tuff that suggest that unambiguous parts of the Balcreuchan Group may also extend upwards to younger ages than previously supposed, perhaps to about 464 Ma (Fujisaki et al 2015).…”

Section: Introductionmentioning

confidence: 98%

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On the age of the Ballantrae Complex, SW Scotland

Stone

Rushton

2018

SJG

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The Ballantrae Complex, SW Scotland, is an ophiolitic assemblage of mostly Early and early Middle Ordovician age (Tremadoc-Arenig in terms of the British Ordovician Series). Its varied components were generated and assembled in the Iapetus Ocean, then obducted onto the Laurentian continental margin by the earliest Llanvirn. The timing of obduction is constrained by biostratigraphic and radiometric data. It was most probably a polyphase process initiated at about the beginning of the Arenig, at about 478 Ma. However, parts of the Complex are significantly younger, with some recent evidence taken to suggest an earliest Llanvirn age of about 464 Ma for the emplacement of some of the volcanic and pelagic sedimentary rocks. The oldest strata in the succession that now unconformably overlies the Ballantrae Complex were deposited at about 463 Ma. Hence there may have been as little as one million years available for the final stages of the Complex's tectonic assembly, obduction, uplift, erosion and downfaulting. Obduction of the Complex has been invoked as a factor in the initiation of the Grampian Orogeny, and whilst there is a broad correlation in timing, the detail from Ballantrae militates against a causal relationship.

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Section: Volcanogenic Zircons In Tuff At Bennane Leamentioning

confidence: 55%

Section: Detrital Zircons In Sandstone At Bennane Leamentioning

confidence: 99%

Section: Volcanogenic Zircons In Tuff At Bennane Leamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

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On the age of the Ballantrae Complex, SW Scotland

Stone

Rushton

2018

SJG

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“…Thrusting of this type has been extensively documented from surface mapping of ancient systems. Examples occur in Scotland (Fujisaki et al, 2015), Costa Rica (Escuder-Viruete & Baumgartner, 2014), Sicily (Di Paolo et al, 2014), Chile (Glodny et al, 2005), Alaska (Gutscher, Kukowski, Malavieille, & Lallemand, 1998), California (Wakabayashi, 2017) and Japan (Hashimoto & Kimura, 1999;Ikesawa et al, 2005;Ueda, Yamamato, & Terabayashi, 2016;Wakita, 2012). The dislocations involved are considered to sole onto the subduction channel at their time of formation, to be intimately associated with subduction complex growth by underplating, and to involve displacements at a range of scales in some cases many kilometres.…”

Section: Model For Accretionary Developmentmentioning

confidence: 99%

Growth and provenance of a Paleozoic subduction complex in the Broken River Province, Mossman Orogen: evidence from detrital zircon ages

Henderson

Fergusson

2019

Australian Journal of Earth Sciences

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A Paleozoic subduction complex dominates the Mossman Orogen developed at the northern extremity of the Tasmanides, eastern Australia. Its southern part, displayed in the Broken River Province, is characterised by dismembered ocean-plate stratigraphy in which turbidite-dominated packages and widespread tectonic mélange development are characteristic. The Broken River complex is characterised by formations with quartzose sandstone alternating with those largely formed of sandstone of more labile character. The two compositional groups are considered to reflect separate, age-significant sedimentary regimes, but their ages have hitherto been poorly constrained. With the use of 1082 concordant detrital zircon ages from 13 samples we provide age control for the complex and track its sedimentary provenance. Of quartzose units, the Tribute Hills Arenite and Pelican Range Formation are late Cambrian-Early Ordovician, and the Wairuna Formation is Middle to Late Ordovician, in age. The more labile units (Greenvale, Perry Creek and Kangaroo Hills formations) are collectively of late Silurian-mid-Devonian age. Development of the complex spanned some 130 Myr. Continent-derived sediment involved in accretion of much the complex, from mid-Ordovician to mid-Devonian, was largely sourced from a nearby magmatic arc of late Cambrian-Devonian age, now represented by granitoid plutons of the Macrossan and Pama igneous associations. An older far-field Pacific-Gondwana sediment source is characteristic of early-phase (late Cambrian-Early Ordovician) accretion, in common with sedimentary units of this age generally developed in the Tasmanides. We consider the complex to have grown largely by underplating that positioned younger components beneath those that are older, with out-of-sequence thrust interleaving of these components occurring late in the accretionary history. A Late Devonian contractional folding and cleavage development (Tabberabberan orogenesis) is uniformly expressed across the entire complex and reflects an abrupt change in plate engagement with imposition of a compressional stress regime.

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