• Login
    View Item 
    •   Home
    • UA Graduate and Undergraduate Research
    • UA Theses and Dissertations
    • Dissertations
    • View Item
    •   Home
    • UA Graduate and Undergraduate Research
    • UA Theses and Dissertations
    • Dissertations
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    All of UA Campus RepositoryCommunitiesTitleAuthorsIssue DateSubmit DateSubjectsPublisherJournalThis CollectionTitleAuthorsIssue DateSubmit DateSubjectsPublisherJournal

    My Account

    LoginRegister

    About

    AboutUA Faculty PublicationsUA DissertationsUA Master's ThesesUA Honors ThesesUA PressUA YearbooksUA CatalogsUA Libraries

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    Tectonic analysis of the Nisling, northern Stikine and northern Cache Creek terranes, Yukon and British Columbia.

    • CSV
    • RefMan
    • EndNote
    • BibTex
    • RefWorks
    Thumbnail
    Name:
    azu_td_9229858_sip1_m.pdf
    Size:
    5.738Mb
    Format:
    PDF
    Description:
    azu_td_9229858_sip1_m.pdf
    Download
    Author
    Jackson, Jay Loren.
    Issue Date
    1992
    Keywords
    Geology.
    Advisor
    Gehrels, George E.
    
    Metadata
    Show full item record
    Publisher
    The University of Arizona.
    Rights
    Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
    Abstract
    Lower Mesozoic strata in the northern Cache Creek terrane range in age from Ladinian to Pliensbachian as shown by conodont and radiolarian collections from chert. Chert beds are interlayered with argillite that has ε(Nd)(t) values of -8.8 to -7.4, indicating detritus eroded from Precambrian source areas. These ε(Nd)(t) values are similar to those of fine-grained Middle Triassic sedimentary strata of the miogeocline (-10.5 to -6.7) and to sediments of the modern Pacific Ocean floor. Volcanic-lithic sandstone interbedded with the chert and argillite is petrographically similar to coeval sandstone from the northern Stikine terrane. ε(Nd)(t) values for northern Cache Creek sandstone are -1.1 to +5.8, similar to most coeval northern Stikine strata (-0.4 to +4.7). These observations, coupled with limited paleocurrent indicators, suggest that northern Cache Creek sandstone was deposited in the distal parts of clastic fans derived from the Late Triassic northern Stikine arc. Quartzofeldspathic sandstone layers in northern Stikine have ε(Nd)(t) values of -8.1 to -1.8 and are associated with conglomerate containing metasedimentary clasts similar to rocks of the Nisling terrane. Nisling rocks have ε(Nd)(t) values of -4.6 to +0.5 (Boundary Ranges suite) and -20.6 to -15.6 (Florence Range suite). These data and existing sedimentologic evidence corroborate interpretations that northern Stikine clastic rocks were derived in part from the Nisling terrane in Late Triassic time. Stacks of thrust sheets containing Cache Creek strata are floored by the Nahlin and King Salmon faults, and are bound on the north by the Squanga-Crag Lake tear fault system which has at least 90 km of right-lateral slip and 2.2 km of south-side-up slip. These strata were thrust southwestward over northern Stikine between Middle Jurassic and mid-Cretaceous time. North and west of this nappe, Stikine and Cache Creek strata are shortened by open, upright folds and only minor thrust faults. Structural, stratigraphic and isotopic data are consistent with a minimum-displacement model for development of the western Canadian Cordillera, in which terranes located east of the Coast Mountains batholith developed and remained in the eastern Pacific Ocean throughout their histories.
    Type
    text
    Dissertation-Reproduction (electronic)
    Degree Name
    Ph.D.
    Degree Level
    doctoral
    Degree Program
    Geosciences
    Graduate College
    Degree Grantor
    University of Arizona
    Collections
    Dissertations

    entitlement

     
    The University of Arizona Libraries | 1510 E. University Blvd. | Tucson, AZ 85721-0055
    Tel 520-621-6442 | repository@u.library.arizona.edu
    DSpace software copyright © 2002-2017  DuraSpace
    Quick Guide | Contact Us | Send Feedback
    Open Repository is a service operated by 
    Atmire NV
     

    Export search results

    The export option will allow you to export the current search results of the entered query to a file. Different formats are available for download. To export the items, click on the button corresponding with the preferred download format.

    By default, clicking on the export buttons will result in a download of the allowed maximum amount of items.

    To select a subset of the search results, click "Selective Export" button and make a selection of the items you want to export. The amount of items that can be exported at once is similarly restricted as the full export.

    After making a selection, click one of the export format buttons. The amount of items that will be exported is indicated in the bubble next to export format.