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dc.contributor.authorMalkowski, Matthew A.
dc.contributor.authorSchwartz, Theresa M.
dc.contributor.authorSharman, Glenn R.
dc.contributor.authorSickmann, Zachary T.
dc.contributor.authorGraham, Stephan A.
dc.date.accessioned2017-04-19T13:13:36Z
dc.date.available2017-04-19T13:13:36Z
dc.date.issued2017-03
dc.identifier.citationMalkowski, M.A., Schwartz, T.M., Sharman, G.R., Sickmann, Z.T., and Graham, S.A. (2017). Stratigraphic and provenance variations in the early evolution of the Magallanes-Austral foreland basin: Implications for the role of longitudinal versus transverse sediment dispersal during arc-continent collision. Geological Society of America Bulletin 129(3-4): 349-371. DOI: 10.1130/B31549.1en_US
dc.identifier.issn0016-7606
dc.identifier.issn1943-2674
dc.identifier.urihttp://hdl.handle.net/10456/42645
dc.description.abstractResolving the role of longitudinal versus transverse sediment dispersal in ancient sedimentary basins is paramount for understanding filling history and the timing of source area exhumation. The southern Patagonian Andes provide a unique opportunity for constraining these relationships because Upper Cretaceous shallow- and deep-marine strata that record the longitudinal filling history of the Magallanes-Austral foreland basin are exposed along a 500+ km outcrop belt. New stratigraphic, sedimentologic, and facies analyses of the Cenomanian-aged Lago Viedma Formation indicate a protracted phase of a dominantly shoreface and foreshore depositional setting at the northern end of the basin (Austral basin sector), whereas 200 km to the south, age-equivalent strata of the Punta Barrosa Formation are characterized by southward-flowing deep-water fan systems. New sandstone compositional data from both formations are rich in intermediate volcanic grains and suggest an undissected to transitional volcanic arc source. However, detrital zircon populations from the shallow- marine Lago Viedma Formation are dominated by arc sources (126-75 Ma), whereas deep- water strata of the Punta Barrosa Formation contain much greater abundances of Jurassic (199-161 Ma) and preJurassic (> 200 Ma) ages. This indicates that deep- water fan systems were not linked to a shelfal sediment dispersal system by a simple northward point-source model, despite consistent southward-directed paleocurrents in deep- water strata. Time-transgressive provenance variations continue southward (along strike), where lithostratigraphic equivalents in the Ultima Esperanza and Fuegian sectors of the basin contain a mix of arc and pre-Jurassic metamorphic basement sources and a paucity of Jurassic ages. We interpret these along-strike provenance variations to be the result of significant local sediment contributions from transverse sources. The influence of transverse tributaries during the early history of the Magallanes-Austral foreland basin suggests that the diachronous onset of coarse clastic deposition in the basin was likely due to the progressive delivery (and initiation) of more locally derived coarse clastic sediment. We attribute this to southward-progressing thrust-belt development associated with progressive north to south collision (or suturing) of the parautochthonous Patagonian arc with attenuated continental crust of South America.en_US
dc.description.sponsorshipStanford Project on Deepwater Depositional Systems (SPODDS); McGee and Leverson graduate research grant.en_US
dc.language.isoen_USen_US
dc.publisherGeological Society of Americaen_US
dc.relation.ispartofGeological Society of America Bulletinen_US
dc.relation.isversionofhttp://gsabulletin.gsapubs.org/content/early/2016/11/03/B31549.1.abstracten_US
dc.rightsCopyright is retained by publisher. Contact the author or publisher for further use of this material. Author can deposit post-print with 12 month embargo.en_US
dc.subjectCerro-toro formationen_US
dc.subjectDetrital Zircon Provenanceen_US
dc.subjectSouthern Patagonian Andesen_US
dc.subjectTres Pasos formationen_US
dc.subjectTierra-del-fuegoen_US
dc.subjectU-PB Shrimpen_US
dc.subjectback-arcen_US
dc.subjectmetamorphic complexesen_US
dc.subjecttectonic evolutionen_US
dc.subjectmarginal basinen_US
dc.titleStratigraphic and provenance variations in the early evolution of the Magallanes-Austral foreland basin: Implications for the role of longitudinal versus transverse sediment dispersal during arc-continent collisionen_US
dc.description.versionFinal manuscript post peer review, without publisher's formatting or copy editing (postprint)en_US
dc.contributor.departmentGeologyen_US
dc.description.embargoThis version of the article is available for viewing to the public after March 31, 2018.en_US
dc.citation.volume129en_US
dc.citation.issue3-4en_US
dc.citation.spage349en_US
dc.citation.epage371en_US
dc.identifier.doi10.1130/B31549.1
dc.contributor.avlauthorSchwartz, Theresa M.


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