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Cryogenian intraplate magmatism along the buried southern Laurentian margin; evidence from volcanic clasts in Ordovician strata, Marathon Uplift, West Texas

Richard E. Hanson, Jonathon M. Roberts, Patricia W. Dickerson and C. Mark Fanning
Cryogenian intraplate magmatism along the buried southern Laurentian margin; evidence from volcanic clasts in Ordovician strata, Marathon Uplift, West Texas
Geology (Boulder) (July 2016) 44 (7): 539-542

Abstract

Critical evidence bearing on the breakup history of the supercontinent Rodinia near the end of the Proterozoic comes from widespread Cryogenian-Cambrian intraplate igneous assemblages present along the margins of cratonic blocks released during Rodinia fragmentation and now distributed around the globe. This magmatism occurred over a long time span (780-540 Ma) prior to and during final stages of Rodinia breakup along the eastern, western, and northern margins of the Laurentia craton, which forms the centerpiece of Rodinia in many reconstructions. Whether similar protracted magmatism occurred prior to the rift-drift transition along the southern Laurentian margin has remained uncertain because of deep burial beneath younger strata. We present geochemical and geochronological data from volcanic clasts within shelf-derived Ordovician turbidites and debris-flow deposits now exposed in allochthonous thrust slices in the Marathon uplift, west Texas (USA), that document one or more episodes of intraplate magmatism extending back at least to 706 Ma along this part of the ancient margin. These data raise the possibility that Laurentia may have been completely encircled by intraplate igneous activity prior to Rodinia breakup, with implications for the driving forces leading to supercontinent fragmentation and factors controlling the sites of ocean-basin formation during that process.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 44
Serial Issue: 7
Title: Cryogenian intraplate magmatism along the buried southern Laurentian margin; evidence from volcanic clasts in Ordovician strata, Marathon Uplift, West Texas
Affiliation: Texas Christian University, School of Geology, Energy and the Environment, Fort Worth, TX, United States
Pages: 539-542
Published: 201607
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 34
Accession Number: 2016-070842
Categories: Igneous and metamorphic petrologyGeochronology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: GSA Data Repository item 2016179
Illustration Description: illus. incl. strat. col., geol. sketch maps
Secondary Affiliation: University of Texas at Austin, USA, United StatesAustralian National University, AUS, Australia
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201634
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