New conodont data from the Cache Creek Group, central British Columbia

Orchard, M J; Struik, L C; Taylor, Helen

doi:10.4095/209492

Cited by 4 publications

(2 citation statements)

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“…Necoslie breccia yields the mixed and condensed conodont fauna, preliminarily reported by Orchard et al (1998). According to Orchard et al (2001) and further examination, the Necoslie fauna consists very predominantly of Middle Carboniferous forms, followed by Lower Permian, Middle Permian, Lower Triassic, Middle Triassic, and Upper Triassic forms (Fig.…”

Section: Mixed Conodont Faunamentioning

confidence: 93%

Necoslie breccia: mixed conodont fauna-bearing neptunian dyke in Carboniferous-Permian seamount-capping oceanic buildup (Pope succession, Cache Creek Complex, central British Columbia)

Sano

Orchard

2004

Facies

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A mixed conodont fauna-bearing limestone breccia, informally designated as Necoslie breccia, crops out as an internal sediment hosted by the Lower Moscovian limestone unit of the Pope limestone succession (Bashkirian to Asselian) of Cache Creek Complex in central British Columbia, reconstructed as a mid-oceanic buildup upon a seamount, or an oceanic plateau. Necoslie breccia consists predominantly of limestone fragments derived from the host rocks, with subordinate isolated skeletal debris, all embedded in a matrix of fine-grained clastic carbonates. The mixed conodont fauna yields the youngest element indicative of Carnian. Our microscopic examination and conodont paleontological data show that Necoslie breccia is better defined as a neptunian dyke formed by infilling sedimentation of carbonates in a fracturing-generated submarine cavity, rather than a karstic cave-fill deposit. We postulate that infilling sedimentation took place immediately after the formation of the cavity, most likely in a transgression period during Carnian time.

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Section: Mixed Conodont Faunamentioning

confidence: 93%

Necoslie breccia: mixed conodont fauna-bearing neptunian dyke in Carboniferous-Permian seamount-capping oceanic buildup (Pope succession, Cache Creek Complex, central British Columbia)

Sano

Orchard

2004

Facies

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“…2A, 2B, 4A). There, 1 m thick massive flows are interbedded with tuffs, volcaniclastic sediments, and lenses of micritic to bioclastic limestones which yielded mid-Permian conodonts (Orchard et al 1998(Orchard et al , 2001. The volcanic rocks have basaltic (PG96-2b) to icelanditic (SCB95) compositions (Table 1).…”

Section: Geologic Setting and Lithostratigraphic Successions Of The C...mentioning

confidence: 99%

The influence of mantle plume in the genesis of the Cache Creek oceanic igneous rocks: implications for the geodynamic evolution of the inner accreted terranes of the Canadian Cordillera

Tardy¹,

Lapierre²,

Struik³

et al. 2001

Rev. Can. Sci. Terre

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West of Prince George, British Columbia, the Cache Creek Terrane is composed of mafic lavas interlayered with both mid-Permian pelagic limestones and Upper Triassic siliceous shales and greywackes. Gabbro, basalt, dolerites, and foliated clinopyroxene-rich ultramafic rocks are exposed within the Pinchi Fault system. The mid-Permian lavas show affinities of oceanic island tholeiites. Among the Triassic lavas, three types of rocks have been distinguished. Type 1 is geochemically similar to the mid-Permian volcanic rocks. Type 2 differs from type 1 by higher TiO 2 abundances and convex rare earth element patterns. Type 3 has the highest Zr, Nb, and Ta abundances and the greatest light rare earth element enrichment. The mafic rocks within the Pinchi Fault system are similar to N-type mid-oceanridge basalt (N-MORB), and the foliated ultramafic rocks are characterized by very low trace element contents, similar to extremely depleted harzburgites. Permian lavas and Triassic type 1 and igneous rocks from the Pinchi Fault system have the highest ε Nd(i) ratios (+7.4 to +9.6) and those of type 3 alkali have the lowest ratios (+2.0 to +5.3). The ε Nd(i) values of type 2 are intermediate between those of type 1 (-+7) and type 3 (-+4.9). This suggests that the Triassic rocks generated from a heterogeneous plume source or the mixing between depleted N-MORB and enriched oceanic island basalt sources. If the mafic igneous rocks sampled in central British Columbia are representative of the preserved parts of an oceanic crust, within the Cache Creek Terrane, then that crust was dominated by oceanic plateau components, perhaps due to the difficulty of subducting thick crust. 534Résumé : À l'ouest de Prince George, en Colombie-Britannique, le terrane de Cache Creek est composé de laves mafiques interstratifiées avec des calcaires pélagiques du Permien moyen et des schistes argileux siliceux et des grauwackes du Trias supérieur. Dans le système de failles Pinchi, on retrouve des affleurements de gabbro, de basalte, de dolérite et de roches ultramafiques foliées et riches en clinopyroxène. Les laves du Permien moyen montrent des affinités avec des tholéiites d'îles océaniques. Parmi les laves du Trias, on distingue trois types de roches. La géochimie du type 1 est similaire à celle des roches volcaniques du Permien moyen. Le type 2 diffère du type 1 par de plus hautes concentrations de TiO 2 et des patrons convexes pour les éléments des terres rares. Le type 3 a les plus grandes concentrations de Zr, Nb, et Ta et le plus grand enrichissement en éléments de terres rares légers. Les roches mafiques à l'intérieur du système de failles Pinchi sont similaires aux basaltes médio-océaniques normaux (N-MORB) alors que les roches ultramafiques foliées sont caractérisées par de très faibles contenus en éléments traces, semblables à des harzburgites extrêmement appauvries. Les laves du Permien, les roches ignées et celles de type 1 du Trias provenant du système de failles Pinchi ont les rapports ε Nd(i) les plus élevés (+7,4 à +9,6) alors qu'ils...

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Heterogeneity of conodont faunas in the Cache Creek Terrane, Canada; significance for tectonic reconstructions of the North American Cordillera

Golding

2018

Palaeogeography, Palaeoclimatology, Palaeoecology

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New conodont data from the Cache Creek Group, central British Columbia

Cited by 4 publications

References 0 publications

Necoslie breccia: mixed conodont fauna-bearing neptunian dyke in Carboniferous-Permian seamount-capping oceanic buildup (Pope succession, Cache Creek Complex, central British Columbia)

Necoslie breccia: mixed conodont fauna-bearing neptunian dyke in Carboniferous-Permian seamount-capping oceanic buildup (Pope succession, Cache Creek Complex, central British Columbia)

The influence of mantle plume in the genesis of the Cache Creek oceanic igneous rocks: implications for the geodynamic evolution of the inner accreted terranes of the Canadian Cordillera

Heterogeneity of conodont faunas in the Cache Creek Terrane, Canada; significance for tectonic reconstructions of the North American Cordillera

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