Carbon-isotope stratigraphy of the uppermost Cambrian in eastern Laurentia: implications for global correlation
The δ13C profile from an interval of the Martin Point section in western Newfoundland (Canada) spans the upper Furongian (uppermost Cambrian). The interval (~90 m) is a part of the Green Point Formation of the Cow Head Group and consists of the Martin Point (lower) and the Broom Point (upper) member...
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| Veröffentlicht in: | Geological magazine 2019-05, Vol.156 (5), p.759-771 |
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| description | The δ13C profile from an interval of the Martin Point section in western Newfoundland (Canada) spans the upper Furongian (uppermost Cambrian). The interval (~90 m) is a part of the Green Point Formation of the Cow Head Group and consists of the Martin Point (lower) and the Broom Point (upper) members. It is formed of slope marine carbonates alternating with shales (rhythmites) and conglomeratic interbeds. The preservation of the investigated micritic carbonates was meticulously evaluated by multiple petrographic and geochemical screening tools. The δ13C and δ18O values (−0.5 ± 0.8 ‰VPDB and −7.1 ± 0.3 ‰VPDB, respectively) exhibit insignificant correlation (R2 = 0.002) and similarly the correlation of δ13C values with their Sr and Mn counterparts, which supports the preservation of at least near-primary δ13C signatures that can be utilized to construct a reliable high-resolution carbon-isotope profile for global correlations. The δ13C profile exhibits two main negative excursions, a lower broad excursion (~3 ‰) that reaches its maximum at ~70 m below the Martin Point / Broom Point members boundary and an upper narrow excursion (~2.5 ‰) immediately below the same boundary. The lower excursion can be correlated with the global latest Furongian HERB event (TOCE), which is also recognized in the C-isotope profile of the GSSP boundary section at Green Point whereas the upper excursion matches with that of the Cambrian‒Ordovician boundary in the same section. The peak of the HERB δ13C excursion is correlated with positive shifts on the Th/U and Ni profiles (redox and productivity proxies). |
| doi_str_mv | 10.1017/S001675681800002X |
| format | Article |
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The interval (~90 m) is a part of the Green Point Formation of the Cow Head Group and consists of the Martin Point (lower) and the Broom Point (upper) members. It is formed of slope marine carbonates alternating with shales (rhythmites) and conglomeratic interbeds. The preservation of the investigated micritic carbonates was meticulously evaluated by multiple petrographic and geochemical screening tools. The δ13C and δ18O values (−0.5 ± 0.8 ‰VPDB and −7.1 ± 0.3 ‰VPDB, respectively) exhibit insignificant correlation (R2 = 0.002) and similarly the correlation of δ13C values with their Sr and Mn counterparts, which supports the preservation of at least near-primary δ13C signatures that can be utilized to construct a reliable high-resolution carbon-isotope profile for global correlations. The δ13C profile exhibits two main negative excursions, a lower broad excursion (~3 ‰) that reaches its maximum at ~70 m below the Martin Point / Broom Point members boundary and an upper narrow excursion (~2.5 ‰) immediately below the same boundary. The lower excursion can be correlated with the global latest Furongian HERB event (TOCE), which is also recognized in the C-isotope profile of the GSSP boundary section at Green Point whereas the upper excursion matches with that of the Cambrian‒Ordovician boundary in the same section. The peak of the HERB δ13C excursion is correlated with positive shifts on the Th/U and Ni profiles (redox and productivity proxies).</description><identifier>ISSN: 0016-7568</identifier><identifier>EISSN: 1469-5081</identifier><identifier>DOI: 10.1017/S001675681800002X</identifier><language>eng</language><publisher>Cambridge, UK: Cambridge University Press</publisher><subject>allochthons ; alteration ; autochthons ; C-13/C-12 ; Cabot Fault ; Cambrian ; Canada ; Carbon ; carbonate rocks ; Carbonates ; chemostratigraphy ; clastic rocks ; Correlation ; Cow Head Group ; diagenesis ; Eastern Canada ; Furongian ; Geochemistry ; Geological time ; global ; Graptolithina ; Green Point Formation ; Hemichordata ; Herbs ; isotope ratios ; Isotopes ; Laurentia ; limestone ; lithostratigraphy ; Long Range Massif ; Manganese ; marine environment ; Martin Point Member ; mudstone ; Newfoundland ; Newfoundland and Labrador ; Ordovician ; Original Articles ; Oxidoreductions ; paleoenvironment ; Paleozoic ; Preservation ; Profiles ; Pterobranchia ; sedimentary rocks ; shale ; shelf environment ; siltstone ; stable isotopes ; Stratigraphy ; Th/U ; Upper Cambrian ; western Newfoundland</subject><ispartof>Geological magazine, 2019-05, Vol.156 (5), p.759-771</ispartof><rights>Copyright © Cambridge University Press 2018</rights><rights>GeoRef, Copyright 2020, American Geosciences Institute. Reference includes data from GeoScienceWorld @Alexandria, VA @USA @United States. Abstract, Copyright, Cambridge University Press</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a376t-c534ef7b82ce5a55d94440e0621167ef1a5ce2f6be10ed3bab9c1f29c291743b3</citedby><cites>FETCH-LOGICAL-a376t-c534ef7b82ce5a55d94440e0621167ef1a5ce2f6be10ed3bab9c1f29c291743b3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.cambridge.org/core/product/identifier/S001675681800002X/type/journal_article$$EHTML$$P50$$Gcambridge$$H</linktohtml><link.rule.ids>164,314,776,780,27901,27902,55603</link.rule.ids></links><search><creatorcontrib>AZMY, KAREM</creatorcontrib><title>Carbon-isotope stratigraphy of the uppermost Cambrian in eastern Laurentia: implications for global correlation</title><title>Geological magazine</title><addtitle>Geol. Mag</addtitle><description>The δ13C profile from an interval of the Martin Point section in western Newfoundland (Canada) spans the upper Furongian (uppermost Cambrian). The interval (~90 m) is a part of the Green Point Formation of the Cow Head Group and consists of the Martin Point (lower) and the Broom Point (upper) members. It is formed of slope marine carbonates alternating with shales (rhythmites) and conglomeratic interbeds. The preservation of the investigated micritic carbonates was meticulously evaluated by multiple petrographic and geochemical screening tools. The δ13C and δ18O values (−0.5 ± 0.8 ‰VPDB and −7.1 ± 0.3 ‰VPDB, respectively) exhibit insignificant correlation (R2 = 0.002) and similarly the correlation of δ13C values with their Sr and Mn counterparts, which supports the preservation of at least near-primary δ13C signatures that can be utilized to construct a reliable high-resolution carbon-isotope profile for global correlations. The δ13C profile exhibits two main negative excursions, a lower broad excursion (~3 ‰) that reaches its maximum at ~70 m below the Martin Point / Broom Point members boundary and an upper narrow excursion (~2.5 ‰) immediately below the same boundary. The lower excursion can be correlated with the global latest Furongian HERB event (TOCE), which is also recognized in the C-isotope profile of the GSSP boundary section at Green Point whereas the upper excursion matches with that of the Cambrian‒Ordovician boundary in the same section. The peak of the HERB δ13C excursion is correlated with positive shifts on the Th/U and Ni profiles (redox and productivity proxies).</description><subject>allochthons</subject><subject>alteration</subject><subject>autochthons</subject><subject>C-13/C-12</subject><subject>Cabot Fault</subject><subject>Cambrian</subject><subject>Canada</subject><subject>Carbon</subject><subject>carbonate rocks</subject><subject>Carbonates</subject><subject>chemostratigraphy</subject><subject>clastic rocks</subject><subject>Correlation</subject><subject>Cow Head Group</subject><subject>diagenesis</subject><subject>Eastern Canada</subject><subject>Furongian</subject><subject>Geochemistry</subject><subject>Geological time</subject><subject>global</subject><subject>Graptolithina</subject><subject>Green Point Formation</subject><subject>Hemichordata</subject><subject>Herbs</subject><subject>isotope ratios</subject><subject>Isotopes</subject><subject>Laurentia</subject><subject>limestone</subject><subject>lithostratigraphy</subject><subject>Long Range Massif</subject><subject>Manganese</subject><subject>marine environment</subject><subject>Martin Point Member</subject><subject>mudstone</subject><subject>Newfoundland</subject><subject>Newfoundland and Labrador</subject><subject>Ordovician</subject><subject>Original Articles</subject><subject>Oxidoreductions</subject><subject>paleoenvironment</subject><subject>Paleozoic</subject><subject>Preservation</subject><subject>Profiles</subject><subject>Pterobranchia</subject><subject>sedimentary rocks</subject><subject>shale</subject><subject>shelf environment</subject><subject>siltstone</subject><subject>stable isotopes</subject><subject>Stratigraphy</subject><subject>Th/U</subject><subject>Upper Cambrian</subject><subject>western Newfoundland</subject><issn>0016-7568</issn><issn>1469-5081</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><sourceid>8G5</sourceid><sourceid>BENPR</sourceid><sourceid>GUQSH</sourceid><sourceid>M2O</sourceid><recordid>eNp1UE1LAzEQDaJgrf4AbwGPsprZ7Kc3KX5BwYMK3pZsdnabst2skxTpvzdtBQVxLsPMvDdv5jF2DuIKBOTXL0JAlqdZAYUIEb8fsAkkWRmlooBDNtmOo-38mJ04twylFEUxYXamqLZDZJz1dkTuPClvOlLjYsNty_0C-XockVbWeT5Tq5qMGrgZOCrnkQY-V2vCwRt1w81q7I0OfDs43lriXW9r1XNtibDf9U_ZUat6h2ffecre7u9eZ4_R_PnhaXY7j5TMMx_pVCbY5nURa0xVmjZlkiQCRRZDeBNbUKnGuM1qBIGNrFVdamjjUscl5Ims5ZRd7PeOZD_W6Hy1tGsagmQVQ5mCzGQeBxTsUZqsc4RtNZJZKdpUIKqtr9UfXwPncs_p0DptcND4aalvfgkIKKtwqpBlQMtvhZ11TYc_uP81vgC0-Yss</recordid><startdate>201905</startdate><enddate>201905</enddate><creator>AZMY, KAREM</creator><general>Cambridge University Press</general><scope>AAYXX</scope><scope>CITATION</scope><scope>3V.</scope><scope>7UA</scope><scope>7XB</scope><scope>88I</scope><scope>8FE</scope><scope>8FG</scope><scope>8FK</scope><scope>8G5</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AEUYN</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>BHPHI</scope><scope>BKSAR</scope><scope>C1K</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>F1W</scope><scope>GNUQQ</scope><scope>GUQSH</scope><scope>H96</scope><scope>HCIFZ</scope><scope>L.G</scope><scope>L6V</scope><scope>M2O</scope><scope>M2P</scope><scope>M7S</scope><scope>MBDVC</scope><scope>PCBAR</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PTHSS</scope><scope>Q9U</scope><scope>R05</scope></search><sort><creationdate>201905</creationdate><title>Carbon-isotope stratigraphy of the uppermost Cambrian in eastern Laurentia: implications for global correlation</title><author>AZMY, KAREM</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a376t-c534ef7b82ce5a55d94440e0621167ef1a5ce2f6be10ed3bab9c1f29c291743b3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2019</creationdate><topic>allochthons</topic><topic>alteration</topic><topic>autochthons</topic><topic>C-13/C-12</topic><topic>Cabot Fault</topic><topic>Cambrian</topic><topic>Canada</topic><topic>Carbon</topic><topic>carbonate rocks</topic><topic>Carbonates</topic><topic>chemostratigraphy</topic><topic>clastic rocks</topic><topic>Correlation</topic><topic>Cow Head Group</topic><topic>diagenesis</topic><topic>Eastern Canada</topic><topic>Furongian</topic><topic>Geochemistry</topic><topic>Geological time</topic><topic>global</topic><topic>Graptolithina</topic><topic>Green Point Formation</topic><topic>Hemichordata</topic><topic>Herbs</topic><topic>isotope ratios</topic><topic>Isotopes</topic><topic>Laurentia</topic><topic>limestone</topic><topic>lithostratigraphy</topic><topic>Long Range Massif</topic><topic>Manganese</topic><topic>marine environment</topic><topic>Martin Point Member</topic><topic>mudstone</topic><topic>Newfoundland</topic><topic>Newfoundland and Labrador</topic><topic>Ordovician</topic><topic>Original Articles</topic><topic>Oxidoreductions</topic><topic>paleoenvironment</topic><topic>Paleozoic</topic><topic>Preservation</topic><topic>Profiles</topic><topic>Pterobranchia</topic><topic>sedimentary rocks</topic><topic>shale</topic><topic>shelf environment</topic><topic>siltstone</topic><topic>stable isotopes</topic><topic>Stratigraphy</topic><topic>Th/U</topic><topic>Upper Cambrian</topic><topic>western Newfoundland</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>AZMY, KAREM</creatorcontrib><collection>CrossRef</collection><collection>ProQuest Central 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Academic UKI Edition</collection><collection>Engineering Collection</collection><collection>ProQuest Central Basic</collection><collection>University of Michigan</collection><jtitle>Geological magazine</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>AZMY, KAREM</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Carbon-isotope stratigraphy of the uppermost Cambrian in eastern Laurentia: implications for global correlation</atitle><jtitle>Geological magazine</jtitle><addtitle>Geol. Mag</addtitle><date>2019-05</date><risdate>2019</risdate><volume>156</volume><issue>5</issue><spage>759</spage><epage>771</epage><pages>759-771</pages><issn>0016-7568</issn><eissn>1469-5081</eissn><abstract>The δ13C profile from an interval of the Martin Point section in western Newfoundland (Canada) spans the upper Furongian (uppermost Cambrian). The interval (~90 m) is a part of the Green Point Formation of the Cow Head Group and consists of the Martin Point (lower) and the Broom Point (upper) members. It is formed of slope marine carbonates alternating with shales (rhythmites) and conglomeratic interbeds. The preservation of the investigated micritic carbonates was meticulously evaluated by multiple petrographic and geochemical screening tools. The δ13C and δ18O values (−0.5 ± 0.8 ‰VPDB and −7.1 ± 0.3 ‰VPDB, respectively) exhibit insignificant correlation (R2 = 0.002) and similarly the correlation of δ13C values with their Sr and Mn counterparts, which supports the preservation of at least near-primary δ13C signatures that can be utilized to construct a reliable high-resolution carbon-isotope profile for global correlations. The δ13C profile exhibits two main negative excursions, a lower broad excursion (~3 ‰) that reaches its maximum at ~70 m below the Martin Point / Broom Point members boundary and an upper narrow excursion (~2.5 ‰) immediately below the same boundary. The lower excursion can be correlated with the global latest Furongian HERB event (TOCE), which is also recognized in the C-isotope profile of the GSSP boundary section at Green Point whereas the upper excursion matches with that of the Cambrian‒Ordovician boundary in the same section. The peak of the HERB δ13C excursion is correlated with positive shifts on the Th/U and Ni profiles (redox and productivity proxies).</abstract><cop>Cambridge, UK</cop><pub>Cambridge University Press</pub><doi>10.1017/S001675681800002X</doi><tpages>13</tpages></addata></record> |
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| subjects | allochthons alteration autochthons C-13/C-12 Cabot Fault Cambrian Canada Carbon carbonate rocks Carbonates chemostratigraphy clastic rocks Correlation Cow Head Group diagenesis Eastern Canada Furongian Geochemistry Geological time global Graptolithina Green Point Formation Hemichordata Herbs isotope ratios Isotopes Laurentia limestone lithostratigraphy Long Range Massif Manganese marine environment Martin Point Member mudstone Newfoundland Newfoundland and Labrador Ordovician Original Articles Oxidoreductions paleoenvironment Paleozoic Preservation Profiles Pterobranchia sedimentary rocks shale shelf environment siltstone stable isotopes Stratigraphy Th/U Upper Cambrian western Newfoundland |
| title | Carbon-isotope stratigraphy of the uppermost Cambrian in eastern Laurentia: implications for global correlation |
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