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TitleRevised stratigraphy of the Hazelton Group in the Iskut River region, northwestern British Columbia
AuthorNelson, J; Waldron, J; van Straaten, B; Zagorevski, A; Rees, C
SourceGeological fieldwork 2017: a summary of field activities and current research; British Columbia Geological Survey Geological Fieldwork Paper 2018-1, 2018 p. 15-38 (Open Access)
LinksOnline - En ligne (pdf)
Alt SeriesNatural Resources Canada, Contribution Series 20180244
PublisherBritish Columbia Ministry of Energy, Mines and Petroleum Resources (Victoria, BC, Canada)
Mediapaper; on-line; digital
File formatpdf
ProvinceBritish Columbia
NTS104A/03; 104A/04; 104A/05; 104A/06; 104A/11; 104A/12; 104A/13; 104A/14; 104B/01; 104B/02; 104B/07; 104B/08; 104B/09; 104B/10; 104B/15; 104B/16; 104G/01; 104G/02; 104G/07; 104G/08; 104G/09; 104G/10; 104G/15; 104G/16; 104H/03; 104H/04; 104H/05; 104H/06; 104H/11; 104H/12; 104H/13; 104H/14
AreaIskut River
Lat/Long WENS-131.0000 -129.0000 58.0000 56.0000
Subjectsregional geology; stratigraphy; economic geology; systematic stratigraphy; nomenclature; stratigraphic correlations; lithostratigraphy; tectonic history; volcanism; sedimentation; rifting; intrusions; ore mineral genesis; mineral deposits; porphyry deposits; bedrock geology; lithology; structural features; faults; folds; anticlinoria; Canadian Cordillera; Stikinia Terrane; Hazelton Group; North American Stratigraphic Code; Klastline Formation; Snippaker Unit; Red Chris Porphyry Deposit; Jack Formation; Betty Creek Formation; Iskut River Formation; Eskay Rhyolite Member; Kinaskan Conglomerate Unit; Quock Formation; Mount Dilworth Formation; Eskay Rift; Eddontenajon Formation; Unuk River Andesite Unit; Brucejack Lake Suite; Johnny Mountain Dacite Unit; Willow Ridge Mafic Unit; Bruce Glacier Felsic Unit; Mount Madge Sedimentary Unit; Downpour Creek Siliciclastic Unit; Palmiere Dacite-Mudstone Unit; Spatsizi Formation; Bowser Lake Group; Laurentia; Ancestral North America; Stuhini Group; Brucejack Lake Felsic Unit; Stikine Assemblage; Nickel Mountain Intrusion; Texas Creek Suite; Tatogga Suite; Granduc Suite; Forrest Kerr Pluton; More Creek Pluton; Stewart-McTagg Anticlinorium; Phanerozoic; Cenozoic; Quaternary; Tertiary; Mesozoic; Cretaceous; Jurassic; Triassic; Paleozoic; Permian; Carboniferous; Devonian
Illustrationsgeoscientific sketch maps; stratigraphic charts; stratigraphic columns; photographs
ProgramGEM2: Geo-mapping for Energy and Minerals, Western Cordillera, Stikine Terrane
Released2018 01 01
AbstractThe Iskut River region hosts many significant porphyry, precious-metal vein and volcanogenic massive sulphide deposits. Most of these deposits are related to the Hazelton Group (latest Triassic to Middle Jurassic) and affiliated intrusions. Current knowledge of the Hazelton Group is the outcome of piecemeal, local mapping contributions over many years by different workers at different scales, resulting in inconsistencies and errors in stratigraphic nomenclature. Given that exploration interest in the region remains high, and that considerable work has recently been done in the region, a reappraisal of this nomenclature, applying provisions in the North American Stratigraphic Code is required. In our new stratigraphic framework, newly recognized units are given local geographic names; others are correlated with previously established units. Two newly defined lowermost Hazelton units, the Klastline formation (new informal name) and the Snippaker unit, are latest Triassic, showing that earliest Hazelton volcanism and sedimentation were coeval with formation of the Red Chris porphyry deposit. These, along with siliciclastic rocks of the Jack Formation (Lower Jurassic) and mainly andesite successions such as the Betty Creek Formation, comprise the lower Hazelton Group. The upper Hazelton Group includes the Iskut River Formation (mainly Aalenian-Bajocian) comprising the bimodal volcanic-sedimentary succession within the Eskay rift that hosts the Eskay volcanogenic massive sulphide deposit; mainly sedimentary units such as the Spatsizi Formation and Quock Formation that occur throughout central Stikinia; the Mount Dilworth Formation, a stratified Middle Jurassic felsic volcanic unit that occurs outside but near the Eskay rift; and the Eddontenajon formation (new informal name), an unusual Pleinsbachian-Toarcian bimodal volcanic-sedimentary sequence that outcrops near the hamlet of Iskut.
Summary(Plain Language Summary, not published)
The Geomapping for Energy and Minerals Program is a collaborative federal geoscience program that provides industry and stakeholders with the next generation of geoscience knowledge. Tectonic models provide regional geoscience knowledge frameworks for understanding distribution of rock units, associated mineral deposits and duration of mineral-prospective systems. This research builds on the regional frameworks developed during previous and ongoing activities in British Columbia. We use published and unpublished data sources to develop a stratigraphic framework of 205 to 170 million year old, mineral-prospective volcanic and sedimentary rocks. These rocks host numerous mineral deposits including the precious metal-rich deposits in Iskut area. We identified that volcanism and sedimentation occurred in several distinct cycles that spanned over 35 million years. Identification of these cycles will aid mineral exploration in the area.