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An Image Mapping Approach to U‐Pb LA‐ICP‐MS Carbonate Dating and Applications to Direct Dating of Carbonate Sedimentation
We present a new approach to laser ablation inductively coupled plasma mass spectrometry (LA‐ICP‐MS) U‐Pb dating of carbonates based on selection and pooling of pixels from 2‐D elemental and isotopic ratio maps. This image mapping technique is particularly useful for targeting subdomains in samples...
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| Published in: | Geochemistry, geophysics, geosystems : G3 geophysics, geosystems : G3, 2018-12, Vol.19 (12), p.4631-4648 |
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| container_title | Geochemistry, geophysics, geosystems : G3 |
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| creator | Drost, Kerstin Chew, David Petrus, Joseph A. Scholze, Frank Woodhead, Jon D. Schneider, Joerg W. Harper, David A. T. |
| description | We present a new approach to laser ablation inductively coupled plasma mass spectrometry (LA‐ICP‐MS) U‐Pb dating of carbonates based on selection and pooling of pixels from 2‐D elemental and isotopic ratio maps. This image mapping technique is particularly useful for targeting subdomains in samples with complex geological histories. Key major and trace elements that are sensitive to detrital components, postformational fluid ingress, mineralogical changes, or diagenetic overprinting are measured along with the Pb and U isotopic data. Laser sampling is undertaken along successive linear rasters that are compiled into maps using the Monocle add‐on for Iolite, with one pixel in the map corresponding to one time slice of the time‐resolved signal. These element, element ratio, and isotope ratio maps can be overlain over photomicrographs or scanning electron microscopy images to spatially link compositional data to textural and structural features. The pixels corresponding to likely homogeneous age domains can be isolated by applying appropriate selection criteria (e.g., Th |
| doi_str_mv | 10.1029/2018GC007850 |
| format | article |
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Plain Language Summary
Carbonate minerals (the constituents of limestones, carbonate veins, and certain fossil shells) form in different environments and in response to different geological processes. Based on the radioactive decay of uranium to lead, the timing of these processes can be dated by measuring uranium and lead isotopes in carbonate minerals. However, this is often difficult to achieve because the uranium‐lead isotope system in carbonates is readily disturbed by later processes or events. Problems also arise if carbonate rocks contain detrital material or different generations of carbonate minerals or if they have unfavorable lead‐uranium ratios. Our approach to dating of carbonates involves mapping of polished rock fragments for key elements along with uranium and lead isotopes. The elemental and isotope maps can be precisely overlain over photomicrographs and other images to link the analytical data to textural and structural features of the sample. Pixels corresponding to specific chemical criteria can be selected from the maps to target areas that share likely similar formation conditions and age. Pooling of the selected pixels in pseudo‐analyses retrieves the largest possible spread in uranium‐lead ratios and helps improve the precision of the age. The approach assists in deriving and interpreting age information from complex carbonate samples.
Key Points
A new strategy for acquisition and processing of combined elemental and U‐Pb isotopic data for carbonate U‐Pb geochronology is presented
Image maps of time‐resolved analyses allow straightforward visual assessment of data in combination with structural and textural features
Selection and pooling of pixels from image maps assists in extraction of accurate and precise U‐Pb ages from likely homogeneous age domains</description><identifier>ISSN: 1525-2027</identifier><identifier>EISSN: 1525-2027</identifier><identifier>DOI: 10.1029/2018GC007850</identifier><language>eng</language><publisher>Washington: John Wiley & Sons, Inc</publisher><subject>Ablation ; Age ; Carbonate minerals ; Carbonate rocks ; Carbonates ; Data ; Data analysis ; Data processing ; Diagenesis ; Electron microscopy ; Fossils ; Geological processes ; image mapping ; Instruments ; Isotopes ; Lasers ; LA‐ICP‐MS U‐Pb dating ; Lead isotopes ; Mapping ; Mass spectrometry ; Mass spectroscopy ; Minerals ; Ratios ; Sedimentation ; selection and pooling of pixels ; Trace elements ; Uranium ; U‐Pb carbonate dating</subject><ispartof>Geochemistry, geophysics, geosystems : G3, 2018-12, Vol.19 (12), p.4631-4648</ispartof><rights>2018. American Geophysical Union. All Rights Reserved.</rights><rights>2018. American Geophysical Union. All rights reserved.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a3689-59e57d4b64086e4126ab8915beab4e66f8b296c45012b9e1709f23ac55e5e4fe3</citedby><cites>FETCH-LOGICAL-a3689-59e57d4b64086e4126ab8915beab4e66f8b296c45012b9e1709f23ac55e5e4fe3</cites><orcidid>0000-0002-6940-1035 ; 0000-0002-9202-4805 ; 0000-0002-7614-0136 ; 0000-0002-4888-6053</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1029%2F2018GC007850$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1029%2F2018GC007850$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,780,784,11560,27922,27923,46050,46474</link.rule.ids><linktorsrc>$$Uhttps://onlinelibrary.wiley.com/doi/abs/10.1029%2F2018GC007850$$EView_record_in_Wiley-Blackwell$$FView_record_in_$$GWiley-Blackwell</linktorsrc></links><search><creatorcontrib>Drost, Kerstin</creatorcontrib><creatorcontrib>Chew, David</creatorcontrib><creatorcontrib>Petrus, Joseph A.</creatorcontrib><creatorcontrib>Scholze, Frank</creatorcontrib><creatorcontrib>Woodhead, Jon D.</creatorcontrib><creatorcontrib>Schneider, Joerg W.</creatorcontrib><creatorcontrib>Harper, David A. T.</creatorcontrib><title>An Image Mapping Approach to U‐Pb LA‐ICP‐MS Carbonate Dating and Applications to Direct Dating of Carbonate Sedimentation</title><title>Geochemistry, geophysics, geosystems : G3</title><description>We present a new approach to laser ablation inductively coupled plasma mass spectrometry (LA‐ICP‐MS) U‐Pb dating of carbonates based on selection and pooling of pixels from 2‐D elemental and isotopic ratio maps. This image mapping technique is particularly useful for targeting subdomains in samples with complex geological histories. Key major and trace elements that are sensitive to detrital components, postformational fluid ingress, mineralogical changes, or diagenetic overprinting are measured along with the Pb and U isotopic data. Laser sampling is undertaken along successive linear rasters that are compiled into maps using the Monocle add‐on for Iolite, with one pixel in the map corresponding to one time slice of the time‐resolved signal. These element, element ratio, and isotope ratio maps can be overlain over photomicrographs or scanning electron microscopy images to spatially link compositional data to textural and structural features. The pixels corresponding to likely homogeneous age domains can be isolated by applying appropriate selection criteria (e.g., Th < 0.3 ppm, Mg/Ca < 0.004) and pooled into pseudo‐analyses using a proxy for the parent/daughter ratio (e.g., 207Pb/235U, 238U/208Pb) to retrieve the largest possible spread of the data points on isochron diagrams. The approach is best suited for analytical setups capable of rapidly or simultaneously scanning over a large mass range and can yield a precision of ±1% or better on quadrupole instruments depending on U concentration, 238U/204Pb, and age of the sample. The sample‐specific filtering criteria for selection and rejection of data and their rationale can be reported, resulting in more transparency with regard to data processing.
Plain Language Summary
Carbonate minerals (the constituents of limestones, carbonate veins, and certain fossil shells) form in different environments and in response to different geological processes. Based on the radioactive decay of uranium to lead, the timing of these processes can be dated by measuring uranium and lead isotopes in carbonate minerals. However, this is often difficult to achieve because the uranium‐lead isotope system in carbonates is readily disturbed by later processes or events. Problems also arise if carbonate rocks contain detrital material or different generations of carbonate minerals or if they have unfavorable lead‐uranium ratios. Our approach to dating of carbonates involves mapping of polished rock fragments for key elements along with uranium and lead isotopes. The elemental and isotope maps can be precisely overlain over photomicrographs and other images to link the analytical data to textural and structural features of the sample. Pixels corresponding to specific chemical criteria can be selected from the maps to target areas that share likely similar formation conditions and age. Pooling of the selected pixels in pseudo‐analyses retrieves the largest possible spread in uranium‐lead ratios and helps improve the precision of the age. The approach assists in deriving and interpreting age information from complex carbonate samples.
Key Points
A new strategy for acquisition and processing of combined elemental and U‐Pb isotopic data for carbonate U‐Pb geochronology is presented
Image maps of time‐resolved analyses allow straightforward visual assessment of data in combination with structural and textural features
Selection and pooling of pixels from image maps assists in extraction of accurate and precise U‐Pb ages from likely homogeneous age domains</description><subject>Ablation</subject><subject>Age</subject><subject>Carbonate minerals</subject><subject>Carbonate rocks</subject><subject>Carbonates</subject><subject>Data</subject><subject>Data analysis</subject><subject>Data processing</subject><subject>Diagenesis</subject><subject>Electron microscopy</subject><subject>Fossils</subject><subject>Geological processes</subject><subject>image mapping</subject><subject>Instruments</subject><subject>Isotopes</subject><subject>Lasers</subject><subject>LA‐ICP‐MS U‐Pb dating</subject><subject>Lead isotopes</subject><subject>Mapping</subject><subject>Mass spectrometry</subject><subject>Mass spectroscopy</subject><subject>Minerals</subject><subject>Ratios</subject><subject>Sedimentation</subject><subject>selection and pooling of pixels</subject><subject>Trace elements</subject><subject>Uranium</subject><subject>U‐Pb carbonate dating</subject><issn>1525-2027</issn><issn>1525-2027</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2018</creationdate><recordtype>article</recordtype><recordid>eNp9kEFOwzAQRS0EEqWw4wCW2BKwndixl1FaQqRWVCpdR3Y6KanaJNipUFdwBM7ISUgoSF2xmT8jvT-j-QhdU3JHCVP3jFCZxISEkpMTNKCccY8RFp4e9efowrk1ITTgXA7Qe1ThdKtXgKe6acpqhaOmsbXOX3Bb48XXx-fM4EnUaRrPujqd41hbU1e6BTzSbe_Q1bJ3bcq8m-vK9c5RaSFv_4i6OHLNYVluoWp_4Et0VuiNg6tfHaLFw_g5fvQmT0kaRxNP-0Iqjyvg4TIwIiBSQECZ0EYqyg1oE4AQhTRMiTzghDKjgIZEFczXOefAISjAH6Kbw97uudcduDZb1ztbdSczRkVIKJdKddTtgcpt7ZyFImtsudV2n1GS9RFnxxF3uH_A38oN7P9lsyRJxoyGXPnfMWh-Ug</recordid><startdate>201812</startdate><enddate>201812</enddate><creator>Drost, Kerstin</creator><creator>Chew, David</creator><creator>Petrus, Joseph A.</creator><creator>Scholze, Frank</creator><creator>Woodhead, Jon D.</creator><creator>Schneider, Joerg W.</creator><creator>Harper, David A. T.</creator><general>John Wiley & Sons, Inc</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>7TN</scope><scope>F1W</scope><scope>H96</scope><scope>KL.</scope><scope>L.G</scope><orcidid>https://orcid.org/0000-0002-6940-1035</orcidid><orcidid>https://orcid.org/0000-0002-9202-4805</orcidid><orcidid>https://orcid.org/0000-0002-7614-0136</orcidid><orcidid>https://orcid.org/0000-0002-4888-6053</orcidid></search><sort><creationdate>201812</creationdate><title>An Image Mapping Approach to U‐Pb LA‐ICP‐MS Carbonate Dating and Applications to Direct Dating of Carbonate Sedimentation</title><author>Drost, Kerstin ; Chew, David ; Petrus, Joseph A. ; Scholze, Frank ; Woodhead, Jon D. ; Schneider, Joerg W. ; Harper, David A. T.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a3689-59e57d4b64086e4126ab8915beab4e66f8b296c45012b9e1709f23ac55e5e4fe3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2018</creationdate><topic>Ablation</topic><topic>Age</topic><topic>Carbonate minerals</topic><topic>Carbonate rocks</topic><topic>Carbonates</topic><topic>Data</topic><topic>Data analysis</topic><topic>Data processing</topic><topic>Diagenesis</topic><topic>Electron microscopy</topic><topic>Fossils</topic><topic>Geological processes</topic><topic>image mapping</topic><topic>Instruments</topic><topic>Isotopes</topic><topic>Lasers</topic><topic>LA‐ICP‐MS U‐Pb dating</topic><topic>Lead isotopes</topic><topic>Mapping</topic><topic>Mass spectrometry</topic><topic>Mass spectroscopy</topic><topic>Minerals</topic><topic>Ratios</topic><topic>Sedimentation</topic><topic>selection and pooling of pixels</topic><topic>Trace elements</topic><topic>Uranium</topic><topic>U‐Pb carbonate dating</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Drost, Kerstin</creatorcontrib><creatorcontrib>Chew, David</creatorcontrib><creatorcontrib>Petrus, Joseph A.</creatorcontrib><creatorcontrib>Scholze, Frank</creatorcontrib><creatorcontrib>Woodhead, Jon D.</creatorcontrib><creatorcontrib>Schneider, Joerg W.</creatorcontrib><creatorcontrib>Harper, David A. T.</creatorcontrib><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Oceanic Abstracts</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><jtitle>Geochemistry, geophysics, geosystems : G3</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Drost, Kerstin</au><au>Chew, David</au><au>Petrus, Joseph A.</au><au>Scholze, Frank</au><au>Woodhead, Jon D.</au><au>Schneider, Joerg W.</au><au>Harper, David A. T.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>An Image Mapping Approach to U‐Pb LA‐ICP‐MS Carbonate Dating and Applications to Direct Dating of Carbonate Sedimentation</atitle><jtitle>Geochemistry, geophysics, geosystems : G3</jtitle><date>2018-12</date><risdate>2018</risdate><volume>19</volume><issue>12</issue><spage>4631</spage><epage>4648</epage><pages>4631-4648</pages><issn>1525-2027</issn><eissn>1525-2027</eissn><abstract>We present a new approach to laser ablation inductively coupled plasma mass spectrometry (LA‐ICP‐MS) U‐Pb dating of carbonates based on selection and pooling of pixels from 2‐D elemental and isotopic ratio maps. This image mapping technique is particularly useful for targeting subdomains in samples with complex geological histories. Key major and trace elements that are sensitive to detrital components, postformational fluid ingress, mineralogical changes, or diagenetic overprinting are measured along with the Pb and U isotopic data. Laser sampling is undertaken along successive linear rasters that are compiled into maps using the Monocle add‐on for Iolite, with one pixel in the map corresponding to one time slice of the time‐resolved signal. These element, element ratio, and isotope ratio maps can be overlain over photomicrographs or scanning electron microscopy images to spatially link compositional data to textural and structural features. The pixels corresponding to likely homogeneous age domains can be isolated by applying appropriate selection criteria (e.g., Th < 0.3 ppm, Mg/Ca < 0.004) and pooled into pseudo‐analyses using a proxy for the parent/daughter ratio (e.g., 207Pb/235U, 238U/208Pb) to retrieve the largest possible spread of the data points on isochron diagrams. The approach is best suited for analytical setups capable of rapidly or simultaneously scanning over a large mass range and can yield a precision of ±1% or better on quadrupole instruments depending on U concentration, 238U/204Pb, and age of the sample. The sample‐specific filtering criteria for selection and rejection of data and their rationale can be reported, resulting in more transparency with regard to data processing.
Plain Language Summary
Carbonate minerals (the constituents of limestones, carbonate veins, and certain fossil shells) form in different environments and in response to different geological processes. Based on the radioactive decay of uranium to lead, the timing of these processes can be dated by measuring uranium and lead isotopes in carbonate minerals. However, this is often difficult to achieve because the uranium‐lead isotope system in carbonates is readily disturbed by later processes or events. Problems also arise if carbonate rocks contain detrital material or different generations of carbonate minerals or if they have unfavorable lead‐uranium ratios. Our approach to dating of carbonates involves mapping of polished rock fragments for key elements along with uranium and lead isotopes. The elemental and isotope maps can be precisely overlain over photomicrographs and other images to link the analytical data to textural and structural features of the sample. Pixels corresponding to specific chemical criteria can be selected from the maps to target areas that share likely similar formation conditions and age. Pooling of the selected pixels in pseudo‐analyses retrieves the largest possible spread in uranium‐lead ratios and helps improve the precision of the age. The approach assists in deriving and interpreting age information from complex carbonate samples.
Key Points
A new strategy for acquisition and processing of combined elemental and U‐Pb isotopic data for carbonate U‐Pb geochronology is presented
Image maps of time‐resolved analyses allow straightforward visual assessment of data in combination with structural and textural features
Selection and pooling of pixels from image maps assists in extraction of accurate and precise U‐Pb ages from likely homogeneous age domains</abstract><cop>Washington</cop><pub>John Wiley & Sons, Inc</pub><doi>10.1029/2018GC007850</doi><tpages>18</tpages><orcidid>https://orcid.org/0000-0002-6940-1035</orcidid><orcidid>https://orcid.org/0000-0002-9202-4805</orcidid><orcidid>https://orcid.org/0000-0002-7614-0136</orcidid><orcidid>https://orcid.org/0000-0002-4888-6053</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | Ablation Age Carbonate minerals Carbonate rocks Carbonates Data Data analysis Data processing Diagenesis Electron microscopy Fossils Geological processes image mapping Instruments Isotopes Lasers LA‐ICP‐MS U‐Pb dating Lead isotopes Mapping Mass spectrometry Mass spectroscopy Minerals Ratios Sedimentation selection and pooling of pixels Trace elements Uranium U‐Pb carbonate dating |
| title | An Image Mapping Approach to U‐Pb LA‐ICP‐MS Carbonate Dating and Applications to Direct Dating of Carbonate Sedimentation |
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