Detrital-zircon geochronology of the Sawtooth metamorphic complex, Idaho; evidence for metamorphosed lower Paleozoic shelf strata within the Idaho Batholith
U-Pb ages of detrital zircons from metasedimentary rocks of the Sawtooth metamorphic complex (SMC) are key for identifying the stratigraphic age of metamorphosed strata within the Idaho batholith region of the Cordilleran orogen. The SMC is an exposure of medium- to high-grade metasedimentary rocks...
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| Veröffentlicht in: | Geosphere (Boulder, Colo.) Colo.), 2016-08, Vol.12 (4), p.1136-1153 |
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| creator | Ma, Chong Bergeron, Philip Foster, David A Dutrow, Barbara L Mueller, Paul A Allen, Chrissy |
| description | U-Pb ages of detrital zircons from metasedimentary rocks of the Sawtooth metamorphic complex (SMC) are key for identifying the stratigraphic age of metamorphosed strata within the Idaho batholith region of the Cordilleran orogen. The SMC is an exposure of medium- to high-grade metasedimentary rocks surrounded by the Idaho and Sawtooth batholiths. U-Pb ages of detrital zircons from SMC quartzites and quartzofeldspathic gneisses yield two distinctive age spectra consisting of primary 2900-2510 Ma and 1990-1760 Ma zircons for one group and 1870-1670 Ma, 1490-1330 Ma, and 1220-1020 Ma zircons for the other group. The suite of samples also yields a small number of zircons with concordant Cambrian and Neoproterozoic ages. Statistical and visual comparisons of age spectra with detrital-zircon data from Proterozoic and Paleozoic strata deposited on the western passive margin of Laurentia suggest that the SMC rocks were deposited in the Cambrian and Middle Ordovician. The identification of lower Paleozoic shelf strata in the SMC, along with similar sections recently identified in the Stibnite and Gospel Peaks inliers of the Idaho batholith, suggest that the Cordilleran passive margin sequence was continuous along the western margin of Laurentia, including the area occupied by the Idaho batholith. |
| doi_str_mv | 10.1130/GES01201.1 |
| format | Article |
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The SMC is an exposure of medium- to high-grade metasedimentary rocks surrounded by the Idaho and Sawtooth batholiths. U-Pb ages of detrital zircons from SMC quartzites and quartzofeldspathic gneisses yield two distinctive age spectra consisting of primary 2900-2510 Ma and 1990-1760 Ma zircons for one group and 1870-1670 Ma, 1490-1330 Ma, and 1220-1020 Ma zircons for the other group. The suite of samples also yields a small number of zircons with concordant Cambrian and Neoproterozoic ages. Statistical and visual comparisons of age spectra with detrital-zircon data from Proterozoic and Paleozoic strata deposited on the western passive margin of Laurentia suggest that the SMC rocks were deposited in the Cambrian and Middle Ordovician. The identification of lower Paleozoic shelf strata in the SMC, along with similar sections recently identified in the Stibnite and Gospel Peaks inliers of the Idaho batholith, suggest that the Cordilleran passive margin sequence was continuous along the western margin of Laurentia, including the area occupied by the Idaho batholith.</description><identifier>ISSN: 1553-040X</identifier><identifier>EISSN: 1553-040X</identifier><identifier>DOI: 10.1130/GES01201.1</identifier><language>eng</language><publisher>Geological Society of America</publisher><subject>absolute age ; basement ; Batholiths ; Belt Supergroup ; depositional environment ; Geochronology ; gneisses ; Idaho ; Idaho Batholith ; igneous and metamorphic rocks ; lithostratigraphy ; lower Paleozoic ; marine environment ; Mesoproterozoic ; Metamorphic ; metamorphic rocks ; metasedimentary rocks ; Neoproterozoic ; nesosilicates ; orthosilicates ; Paleozoic ; paragneiss ; Petrology ; Precambrian ; Proterozoic ; protoliths ; provenance ; Radioactive age determination ; Rocks ; Sawtooth Range ; sedimentary rocks ; shelf environment ; Shelves ; silicates ; south-central Idaho ; Spectra ; statistical analysis ; Strata ; stratigraphic units ; U/Pb ; United States ; upper Precambrian ; Windermere System ; Zircon ; zircon group</subject><ispartof>Geosphere (Boulder, Colo.), 2016-08, Vol.12 (4), p.1136-1153</ispartof><rights>GeoRef, Copyright 2022, American Geosciences Institute. Reference includes data from GeoScienceWorld @Alexandria, VA @USA @United States. Reference includes data supplied by the Geological Society of America @Boulder, CO @USA @United States</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a392t-8d49d4fc8f41d1af6e3baee186fbb8cffbbb96d0565e4f34fb15ed82aaaa40213</citedby><cites>FETCH-LOGICAL-a392t-8d49d4fc8f41d1af6e3baee186fbb8cffbbb96d0565e4f34fb15ed82aaaa40213</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27922,27923</link.rule.ids></links><search><creatorcontrib>Ma, Chong</creatorcontrib><creatorcontrib>Bergeron, Philip</creatorcontrib><creatorcontrib>Foster, David A</creatorcontrib><creatorcontrib>Dutrow, Barbara L</creatorcontrib><creatorcontrib>Mueller, Paul A</creatorcontrib><creatorcontrib>Allen, Chrissy</creatorcontrib><title>Detrital-zircon geochronology of the Sawtooth metamorphic complex, Idaho; evidence for metamorphosed lower Paleozoic shelf strata within the Idaho Batholith</title><title>Geosphere (Boulder, Colo.)</title><description>U-Pb ages of detrital zircons from metasedimentary rocks of the Sawtooth metamorphic complex (SMC) are key for identifying the stratigraphic age of metamorphosed strata within the Idaho batholith region of the Cordilleran orogen. The SMC is an exposure of medium- to high-grade metasedimentary rocks surrounded by the Idaho and Sawtooth batholiths. U-Pb ages of detrital zircons from SMC quartzites and quartzofeldspathic gneisses yield two distinctive age spectra consisting of primary 2900-2510 Ma and 1990-1760 Ma zircons for one group and 1870-1670 Ma, 1490-1330 Ma, and 1220-1020 Ma zircons for the other group. The suite of samples also yields a small number of zircons with concordant Cambrian and Neoproterozoic ages. Statistical and visual comparisons of age spectra with detrital-zircon data from Proterozoic and Paleozoic strata deposited on the western passive margin of Laurentia suggest that the SMC rocks were deposited in the Cambrian and Middle Ordovician. The identification of lower Paleozoic shelf strata in the SMC, along with similar sections recently identified in the Stibnite and Gospel Peaks inliers of the Idaho batholith, suggest that the Cordilleran passive margin sequence was continuous along the western margin of Laurentia, including the area occupied by the Idaho batholith.</description><subject>absolute age</subject><subject>basement</subject><subject>Batholiths</subject><subject>Belt Supergroup</subject><subject>depositional environment</subject><subject>Geochronology</subject><subject>gneisses</subject><subject>Idaho</subject><subject>Idaho Batholith</subject><subject>igneous and metamorphic rocks</subject><subject>lithostratigraphy</subject><subject>lower Paleozoic</subject><subject>marine environment</subject><subject>Mesoproterozoic</subject><subject>Metamorphic</subject><subject>metamorphic rocks</subject><subject>metasedimentary rocks</subject><subject>Neoproterozoic</subject><subject>nesosilicates</subject><subject>orthosilicates</subject><subject>Paleozoic</subject><subject>paragneiss</subject><subject>Petrology</subject><subject>Precambrian</subject><subject>Proterozoic</subject><subject>protoliths</subject><subject>provenance</subject><subject>Radioactive age determination</subject><subject>Rocks</subject><subject>Sawtooth Range</subject><subject>sedimentary rocks</subject><subject>shelf environment</subject><subject>Shelves</subject><subject>silicates</subject><subject>south-central Idaho</subject><subject>Spectra</subject><subject>statistical analysis</subject><subject>Strata</subject><subject>stratigraphic units</subject><subject>U/Pb</subject><subject>United States</subject><subject>upper Precambrian</subject><subject>Windermere System</subject><subject>Zircon</subject><subject>zircon group</subject><issn>1553-040X</issn><issn>1553-040X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2016</creationdate><recordtype>article</recordtype><recordid>eNqNkc1O3DAQgCNUJChw4Ql8rNqG2nGcTdRTuyyw0kpFAiRulmOPiZGT2dpeFngWHpYs24oeO4eZ0eib_yw7ZvSEMU6_nc-uKCsoO2E72T4Tgue0pLcf_vH3so8x3lPKG8GL_ezlFFJwSfn82QWNA7kD1F3AAT3ePRG0JHVArtQ6IaaO9JBUj2HZOU009ksPj1_J3KgOvxN4cAYGDcRieAcxgiEe1xDIpfKAzzimxg68JTEFlRRZu9S54a3PWyXyU6UO_Rg9zHat8hGO_tiD7OZsdj29yBe_zufTH4tc8aZIeW3KxpRW17ZkhilbAW8VAKsr27a1tqNum8pQUQkoLS9tywSYulCjlLRg_CD7tK27DPh7BTHJ3kUN3qsBcBUlq7kQopw0_D9QJia0ELUY0c9bVAeMMYCVy-B6FZ4ko3LzLfn3W3IzwpctPN4_are54xqDN_IeV2EYl5cjV0k6qWrB-CuTxZsA</recordid><startdate>20160801</startdate><enddate>20160801</enddate><creator>Ma, Chong</creator><creator>Bergeron, Philip</creator><creator>Foster, David A</creator><creator>Dutrow, Barbara L</creator><creator>Mueller, Paul A</creator><creator>Allen, Chrissy</creator><general>Geological Society of America</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7UA</scope><scope>C1K</scope><scope>F1W</scope><scope>H96</scope><scope>L.G</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope></search><sort><creationdate>20160801</creationdate><title>Detrital-zircon geochronology of the Sawtooth metamorphic complex, Idaho; evidence for metamorphosed lower Paleozoic shelf strata within the Idaho Batholith</title><author>Ma, Chong ; Bergeron, Philip ; Foster, David A ; Dutrow, Barbara L ; Mueller, Paul A ; Allen, Chrissy</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a392t-8d49d4fc8f41d1af6e3baee186fbb8cffbbb96d0565e4f34fb15ed82aaaa40213</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2016</creationdate><topic>absolute age</topic><topic>basement</topic><topic>Batholiths</topic><topic>Belt Supergroup</topic><topic>depositional environment</topic><topic>Geochronology</topic><topic>gneisses</topic><topic>Idaho</topic><topic>Idaho Batholith</topic><topic>igneous and metamorphic rocks</topic><topic>lithostratigraphy</topic><topic>lower Paleozoic</topic><topic>marine environment</topic><topic>Mesoproterozoic</topic><topic>Metamorphic</topic><topic>metamorphic rocks</topic><topic>metasedimentary rocks</topic><topic>Neoproterozoic</topic><topic>nesosilicates</topic><topic>orthosilicates</topic><topic>Paleozoic</topic><topic>paragneiss</topic><topic>Petrology</topic><topic>Precambrian</topic><topic>Proterozoic</topic><topic>protoliths</topic><topic>provenance</topic><topic>Radioactive age determination</topic><topic>Rocks</topic><topic>Sawtooth Range</topic><topic>sedimentary rocks</topic><topic>shelf environment</topic><topic>Shelves</topic><topic>silicates</topic><topic>south-central Idaho</topic><topic>Spectra</topic><topic>statistical analysis</topic><topic>Strata</topic><topic>stratigraphic units</topic><topic>U/Pb</topic><topic>United States</topic><topic>upper Precambrian</topic><topic>Windermere System</topic><topic>Zircon</topic><topic>zircon group</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Ma, Chong</creatorcontrib><creatorcontrib>Bergeron, Philip</creatorcontrib><creatorcontrib>Foster, David A</creatorcontrib><creatorcontrib>Dutrow, Barbara L</creatorcontrib><creatorcontrib>Mueller, Paul A</creatorcontrib><creatorcontrib>Allen, Chrissy</creatorcontrib><collection>CrossRef</collection><collection>Water Resources Abstracts</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Geosphere (Boulder, Colo.)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Ma, Chong</au><au>Bergeron, Philip</au><au>Foster, David A</au><au>Dutrow, Barbara L</au><au>Mueller, Paul A</au><au>Allen, Chrissy</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Detrital-zircon geochronology of the Sawtooth metamorphic complex, Idaho; evidence for metamorphosed lower Paleozoic shelf strata within the Idaho Batholith</atitle><jtitle>Geosphere (Boulder, Colo.)</jtitle><date>2016-08-01</date><risdate>2016</risdate><volume>12</volume><issue>4</issue><spage>1136</spage><epage>1153</epage><pages>1136-1153</pages><issn>1553-040X</issn><eissn>1553-040X</eissn><abstract>U-Pb ages of detrital zircons from metasedimentary rocks of the Sawtooth metamorphic complex (SMC) are key for identifying the stratigraphic age of metamorphosed strata within the Idaho batholith region of the Cordilleran orogen. The SMC is an exposure of medium- to high-grade metasedimentary rocks surrounded by the Idaho and Sawtooth batholiths. U-Pb ages of detrital zircons from SMC quartzites and quartzofeldspathic gneisses yield two distinctive age spectra consisting of primary 2900-2510 Ma and 1990-1760 Ma zircons for one group and 1870-1670 Ma, 1490-1330 Ma, and 1220-1020 Ma zircons for the other group. The suite of samples also yields a small number of zircons with concordant Cambrian and Neoproterozoic ages. Statistical and visual comparisons of age spectra with detrital-zircon data from Proterozoic and Paleozoic strata deposited on the western passive margin of Laurentia suggest that the SMC rocks were deposited in the Cambrian and Middle Ordovician. The identification of lower Paleozoic shelf strata in the SMC, along with similar sections recently identified in the Stibnite and Gospel Peaks inliers of the Idaho batholith, suggest that the Cordilleran passive margin sequence was continuous along the western margin of Laurentia, including the area occupied by the Idaho batholith.</abstract><pub>Geological Society of America</pub><doi>10.1130/GES01201.1</doi><tpages>18</tpages><oa>free_for_read</oa></addata></record> |
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| subjects | absolute age basement Batholiths Belt Supergroup depositional environment Geochronology gneisses Idaho Idaho Batholith igneous and metamorphic rocks lithostratigraphy lower Paleozoic marine environment Mesoproterozoic Metamorphic metamorphic rocks metasedimentary rocks Neoproterozoic nesosilicates orthosilicates Paleozoic paragneiss Petrology Precambrian Proterozoic protoliths provenance Radioactive age determination Rocks Sawtooth Range sedimentary rocks shelf environment Shelves silicates south-central Idaho Spectra statistical analysis Strata stratigraphic units U/Pb United States upper Precambrian Windermere System Zircon zircon group |
| title | Detrital-zircon geochronology of the Sawtooth metamorphic complex, Idaho; evidence for metamorphosed lower Paleozoic shelf strata within the Idaho Batholith |
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