The geology and mid-Jurassic amalgamation of Tracy Arm terrane and Stikinia of northwestern British Columbia.

Currie, Lisel D.

doi:10.22215/etd/1994-02875

Cited by 8 publications

(36 citation statements)

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“…Differences include the lack of abundant carbonate in the Scotia-Quaal belt and its abundance throughout Paleozoic strata of the Stikine ter-rane, and the paucity of quartz-rich sedimentary rocks in the Stikine terrane compared to their abundance (~15%) in the Scotia-Quaal belt. Currie (1994) suggested that the quartzites of the Scotia-Quaal belt may be analogous to those described in the Iskut River area by McClelland (1991). Indeed, they may be, but McClelland correlated the Iskut area quartzose clastic rocks with Yukon-Tanana strata (our preferred interpretation, discussed as follows), not the Stikine terrane.…”

Section: Comparison With Stikine Terranementioning

confidence: 80%

“…Mortensen and Jilson (1985) and Mortensen (1992) argued that the Yukon-Tanana terrane is a fundamentally coherent assemblage of Proterozoic to lower Paleozoic passive continental margin strata overlain and intruded by middle to late Paleozoic rocks that formed in a continental margin arc-type environment. Currie (1994) and Parrish (1993, 1997) disagreed with this view. They separated metamorphosed pelite, marble, and quartzite, commonly containing Precambrian detrital zircons, from Paleozoic to Mesozoic volcanic, sedimentary, and plutonic rocks that commonly include Devonian plutonic and Permian volcanic protoliths and are intruded by Early to Middle Jurassic plutons.…”

Section: Comparison With Continental Margin Assemblages Along Strike mentioning

confidence: 99%

“…The Paleozoic metavolcanic, metasedimentary clastic and layered gneiss units of the Scotia-Quaal area may be equivalent to Devonian to Permian arc-related rocks of the Stikine terrane (Table 2). Currie (1994) and Currie and Parrish (1997) argued that the Paleozoic Scotia-Quaal assemblage belongs to the Stikine terrane, on the basis of the presence of Devonian igneous rocks. We are less impressed with these similarities, however, than with the stratigraphic differences between the two regions.…”

Section: Comparison With Stikine Terranementioning

confidence: 99%

“…Because continental margin and arc-type rocks are closely associated at several locations and over wide areas, we favor the use of Yukon-Tanana terrane as defined by Coney et al (1980), Monger and Berg (1987), and Mortensen (1992). Table 4 compares assemblages in the Scotia-Quaal belt with those in the Yukon-Tanana terrane of the Yukon (Mortensen, 1992) and in the Tagish Lake area of northern British Columbia (Currie, 1992(Currie, , 1994Parrish, 1993, 1997). Both the Scotia-Quaal belt and the Yukon-Tanana rocks in the Yukon contain quartz-rich metasedimentary rocks of pre-Late Devonian age in the Yukon and of uncertain but probably Paleozoic age in the Scotia-Quaal area.…”

Section: Comparison With Continental Margin Assemblages Along Strike mentioning

confidence: 99%

“…Intrusive rocks of late Early to early Middle Jurassic age occur in both areas. Parrish (1993, 1997) and Currie (1994) argued for division of the Tagish lake rocks into two terranes. They assigned rocks with continental margin affinities, the Nisling assemblage in the Nisling terrane (usage of Wheeler and McFeely, 1991) or the lower unit of the Yukon-Tanana terrane (usage of Mortensen, 1992) to the Tracy Arm terrane.…”

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Yukon-Tanana Terrane in the Scotia-Quaal Belt, Coast Plutonic Complex, central-western British Columbia

Gareau¹,

Woodsworth²

2000

Tectonics of the Coast Mountains, Southeastern Alaska and British Columbia

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Section: Comparison With Stikine Terranementioning

confidence: 80%

Section: Comparison With Continental Margin Assemblages Along Strike mentioning

confidence: 99%

Section: Comparison With Stikine Terranementioning

confidence: 99%

Section: Comparison With Continental Margin Assemblages Along Strike mentioning

confidence: 99%

mentioning

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Yukon-Tanana Terrane in the Scotia-Quaal Belt, Coast Plutonic Complex, central-western British Columbia

Gareau¹,

Woodsworth²

2000

Tectonics of the Coast Mountains, Southeastern Alaska and British Columbia

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Geology, U‐Pb Geochronology, and Hf Isotope Geochemistry Across the Mesozoic Alaska Range Suture Zone (South‐Central Alaska): Implications for Cordilleran Collisional Processes and Tectonic Growth of North America

2020

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The Mesozoic Alaska Range suture zone is defined by a transition from oceanic to continental terranes and is part of a 2000-km-long tectonic boundary throughout the northern Cordillera. Surface geologic mapping of the rock types across this suture zone provides critical information about the upper crustal configuration but provides little insight into the sedimentary, igneous, and metamorphic processes that occurred in deeper levels of the collisional zone. To better constrain the timing and mantle-crust sources of collision-related magmatism, we combine U-Pb ages and Hf isotope compositions of detrital zircons from the three main components of the suture zone. U-Pb/Hf data sets from inboard, continental margin samples have Precambrian-Paleozoic ages with epsilon Hf (t) values ranging between +10 and −20. U-Pb/Hf data sets from the outboard, oceanic terrane samples have Pennsylvanian-Permian detrital zircon ages with epsilon Hf (t) values between +16 and +10. The U-Pb/Hf data set of detrital zircons from Mesozoic strata that represent intervening sedimentary basin(s) that formed between the continental margin and oceanic terranes record Precambrian-Mesozoic detrital zircon ages with epsilon Hf (t) values between +14 and −20. Results of the study document four Archean and Proterozoic global crustal magmatic events that are correlated to the tectonic growth of Laurentia. Also, three Phanerozoic magmatic events have been identified that represent more regional tectonic events. This study demonstrates that the combination of U-Pb geochronology and Hf isotope geochemistry applied to detrital zircons is a powerful tool to define sediment provenance in collisional zones and delineate episodes of global and regional magmatism along convergent plate boundaries.

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Late Triassic to Jurassic Magmatic and Tectonic Evolution of the Intermontane Terranes in Yukon, Northern Canadian Cordillera: Transition From Arc to Syn‐Collisional Magmatism and Post‐Collisional Lithospheric Delamination

et al. 2022

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Crustal growth at convergent margins is generally thought to occur through accretion of juvenile arc crust and/ or addition of magmatic material to the edge of a craton (e.g., Rudnick, 1995). Arc-continent collision zones are thus major sites for crustal growth through time (e.g., Brown et al., 2011). Arc accretion generally leads to development of an accretionary orogen, associated magmatism and basin(s) (e.g., Cawood et al., 2009;Draut & Clift, 2012). The evolution of arc-continent collision zones is generally complex and shows a wide-range of variations depending on configuration of continental and arc crusts, and angle and rates of convergence (Brown et al., 2011). There is no simple model that explains the variations observed in modern and ancient arc-continent collisions.In western North America, the development of the northern Cordilleran accretionary orogen began with collision of early Mesozoic peri-Laurentian arcs with the continental margin in latest Triassic to

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The geology and mid-Jurassic amalgamation of Tracy Arm terrane and Stikinia of northwestern British Columbia.

Cited by 8 publications

References 0 publications

Yukon-Tanana Terrane in the Scotia-Quaal Belt, Coast Plutonic Complex, central-western British Columbia

Yukon-Tanana Terrane in the Scotia-Quaal Belt, Coast Plutonic Complex, central-western British Columbia

Geology, U‐Pb Geochronology, and Hf Isotope Geochemistry Across the Mesozoic Alaska Range Suture Zone (South‐Central Alaska): Implications for Cordilleran Collisional Processes and Tectonic Growth of North America

Late Triassic to Jurassic Magmatic and Tectonic Evolution of the Intermontane Terranes in Yukon, Northern Canadian Cordillera: Transition From Arc to Syn‐Collisional Magmatism and Post‐Collisional Lithospheric Delamination

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