Multi-step TIMS and CA-TIMS monazite U–Pb geochronology
Multi-step chemical abrasion thermal ionization mass spectrometry (CA-TIMS) methods were developed for monazite using six samples that vary in composition and age—Amelia, Jefferson County, Burke, Elk Mountain, 554 and Madagascar. To evaluate whether the multi-step CA-TIMS approach reveals complexiti...
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| Veröffentlicht in: | Chemical geology 2012-06, Vol.312-313, p.58-73 |
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| creator | Peterman, Emily M. Mattinson, James M. Hacker, Bradley R. |
| description | Multi-step chemical abrasion thermal ionization mass spectrometry (CA-TIMS) methods were developed for monazite using six samples that vary in composition and age—Amelia, Jefferson County, Burke, Elk Mountain, 554 and Madagascar. To evaluate whether the multi-step CA-TIMS approach reveals complexities in either age or composition that might be masked by single-step analysis, this study presents a side-by-side comparison of monazite samples dated via multi-step TIMS (not annealed) and CA-TIMS (annealed), and measurement of rare earth element ratios for each dissolution step. The data demonstrate three important contributions. First, annealing reduces solubility—after one partial dissolution step, not-annealed fractions were 3.3–4.1 times more digested than the annealed fractions. The difference in solubility suggests that monazite does not fully self-anneal at low temperatures. Second, multi-step TIMS analyses yielded high-precision U–Pb plateau ages for the Burke and Amelia monazites; CA-TIMS analyses yielded high-precision U–Pb plateau ages for Madagascar and Amelia monazites. Jefferson County, Elk Mountain and 554 yielded more complex results and no U–Pb plateau ages. Third, chemical analysis of partial-dissolution steps reveals heterogeneous age and compositional data for annealed samples. Because not-annealed samples yielded more consistent age and compositional data, high-temperature annealing is not recommended for monazite. Instead, optimal TIMS results are provided by slow, partial dissolution of monazite in weak acid.
► High temperature annealing reduces the solubility of monazite. ► Multi-step CA-TIMS approach yields high-precision plateau ages. ► Chemical analysis shows complex age and composition data for annealed samples. ► Not-annealed samples yield more consistent age and compositional data. |
| doi_str_mv | 10.1016/j.chemgeo.2012.04.006 |
| format | Article |
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► High temperature annealing reduces the solubility of monazite. ► Multi-step CA-TIMS approach yields high-precision plateau ages. ► Chemical analysis shows complex age and composition data for annealed samples. ► Not-annealed samples yield more consistent age and compositional data.</description><identifier>ISSN: 0009-2541</identifier><identifier>EISSN: 1872-6836</identifier><identifier>DOI: 10.1016/j.chemgeo.2012.04.006</identifier><language>eng</language><publisher>Elsevier B.V</publisher><subject>Abrasion ; Abrasion resistance ; Age ; Annealing ; Chemical abrasion ; chemical analysis ; Dissolution ; Geochronology ; ionization ; mass spectrometry ; Monazite ; Mountains ; plateaus ; rare earth elements ; solubility ; temperature ; U–Pb</subject><ispartof>Chemical geology, 2012-06, Vol.312-313, p.58-73</ispartof><rights>2012 Elsevier B.V.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a422t-8b7f2255b96ff6524ae3522eab67aefbfcc76eafde1dbe96c048bb2d4366b19c3</citedby><cites>FETCH-LOGICAL-a422t-8b7f2255b96ff6524ae3522eab67aefbfcc76eafde1dbe96c048bb2d4366b19c3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.sciencedirect.com/science/article/pii/S0009254112001726$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,776,780,3537,27901,27902,65306</link.rule.ids></links><search><creatorcontrib>Peterman, Emily M.</creatorcontrib><creatorcontrib>Mattinson, James M.</creatorcontrib><creatorcontrib>Hacker, Bradley R.</creatorcontrib><title>Multi-step TIMS and CA-TIMS monazite U–Pb geochronology</title><title>Chemical geology</title><description>Multi-step chemical abrasion thermal ionization mass spectrometry (CA-TIMS) methods were developed for monazite using six samples that vary in composition and age—Amelia, Jefferson County, Burke, Elk Mountain, 554 and Madagascar. To evaluate whether the multi-step CA-TIMS approach reveals complexities in either age or composition that might be masked by single-step analysis, this study presents a side-by-side comparison of monazite samples dated via multi-step TIMS (not annealed) and CA-TIMS (annealed), and measurement of rare earth element ratios for each dissolution step. The data demonstrate three important contributions. First, annealing reduces solubility—after one partial dissolution step, not-annealed fractions were 3.3–4.1 times more digested than the annealed fractions. The difference in solubility suggests that monazite does not fully self-anneal at low temperatures. Second, multi-step TIMS analyses yielded high-precision U–Pb plateau ages for the Burke and Amelia monazites; CA-TIMS analyses yielded high-precision U–Pb plateau ages for Madagascar and Amelia monazites. Jefferson County, Elk Mountain and 554 yielded more complex results and no U–Pb plateau ages. Third, chemical analysis of partial-dissolution steps reveals heterogeneous age and compositional data for annealed samples. Because not-annealed samples yielded more consistent age and compositional data, high-temperature annealing is not recommended for monazite. Instead, optimal TIMS results are provided by slow, partial dissolution of monazite in weak acid.
► High temperature annealing reduces the solubility of monazite. ► Multi-step CA-TIMS approach yields high-precision plateau ages. ► Chemical analysis shows complex age and composition data for annealed samples. ► Not-annealed samples yield more consistent age and compositional data.</description><subject>Abrasion</subject><subject>Abrasion resistance</subject><subject>Age</subject><subject>Annealing</subject><subject>Chemical abrasion</subject><subject>chemical analysis</subject><subject>Dissolution</subject><subject>Geochronology</subject><subject>ionization</subject><subject>mass spectrometry</subject><subject>Monazite</subject><subject>Mountains</subject><subject>plateaus</subject><subject>rare earth elements</subject><subject>solubility</subject><subject>temperature</subject><subject>U–Pb</subject><issn>0009-2541</issn><issn>1872-6836</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2012</creationdate><recordtype>article</recordtype><recordid>eNqFkMtKxDAUhoMoOF4eQezSTWuSNmm7Ehm8DMygMM46JOnJmKFtxqQj6Mp38A19EqN17-qcA99_fvgQOiM4I5jwy02mn6Fbg8soJjTDRYYx30MTUpU05VXO99EEY1ynlBXkEB2FsIknyRmboHqxawebhgG2ydNssUxk3yTT6_R371wv3-0Ayerr4_NRJbFCP3vXu9at307QgZFtgNO_eYxWtzdP0_t0_nA3m17PU1lQOqSVKg2ljKmaG8MZLSTkjFKQipcSjDJalxykaYA0CmqucVEpRZsi51yRWufH6GL8u_XuZQdhEJ0NGtpW9uB2QZCSU0JLzPH_KM5JTquiqiLKRlR7F4IHI7bedtK_RUj8WBUb8WdV_FgVuBDRasydjzkjnZBrb4NYLSPAolFe1pxG4mokIEp5teBF0BZ6DY31oAfROPtPxzcTuYuW</recordid><startdate>20120618</startdate><enddate>20120618</enddate><creator>Peterman, Emily M.</creator><creator>Mattinson, James M.</creator><creator>Hacker, Bradley R.</creator><general>Elsevier B.V</general><scope>FBQ</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QH</scope><scope>7UA</scope><scope>C1K</scope><scope>F1W</scope><scope>H96</scope><scope>L.G</scope><scope>8FD</scope><scope>FR3</scope><scope>KR7</scope></search><sort><creationdate>20120618</creationdate><title>Multi-step TIMS and CA-TIMS monazite U–Pb geochronology</title><author>Peterman, Emily M. ; Mattinson, James M. ; Hacker, Bradley R.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a422t-8b7f2255b96ff6524ae3522eab67aefbfcc76eafde1dbe96c048bb2d4366b19c3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2012</creationdate><topic>Abrasion</topic><topic>Abrasion resistance</topic><topic>Age</topic><topic>Annealing</topic><topic>Chemical abrasion</topic><topic>chemical analysis</topic><topic>Dissolution</topic><topic>Geochronology</topic><topic>ionization</topic><topic>mass spectrometry</topic><topic>Monazite</topic><topic>Mountains</topic><topic>plateaus</topic><topic>rare earth elements</topic><topic>solubility</topic><topic>temperature</topic><topic>U–Pb</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Peterman, Emily M.</creatorcontrib><creatorcontrib>Mattinson, James M.</creatorcontrib><creatorcontrib>Hacker, Bradley R.</creatorcontrib><collection>AGRIS</collection><collection>CrossRef</collection><collection>Aqualine</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>Engineering Research Database</collection><collection>Civil Engineering Abstracts</collection><jtitle>Chemical geology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Peterman, Emily M.</au><au>Mattinson, James M.</au><au>Hacker, Bradley R.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Multi-step TIMS and CA-TIMS monazite U–Pb geochronology</atitle><jtitle>Chemical geology</jtitle><date>2012-06-18</date><risdate>2012</risdate><volume>312-313</volume><spage>58</spage><epage>73</epage><pages>58-73</pages><issn>0009-2541</issn><eissn>1872-6836</eissn><abstract>Multi-step chemical abrasion thermal ionization mass spectrometry (CA-TIMS) methods were developed for monazite using six samples that vary in composition and age—Amelia, Jefferson County, Burke, Elk Mountain, 554 and Madagascar. To evaluate whether the multi-step CA-TIMS approach reveals complexities in either age or composition that might be masked by single-step analysis, this study presents a side-by-side comparison of monazite samples dated via multi-step TIMS (not annealed) and CA-TIMS (annealed), and measurement of rare earth element ratios for each dissolution step. The data demonstrate three important contributions. First, annealing reduces solubility—after one partial dissolution step, not-annealed fractions were 3.3–4.1 times more digested than the annealed fractions. The difference in solubility suggests that monazite does not fully self-anneal at low temperatures. Second, multi-step TIMS analyses yielded high-precision U–Pb plateau ages for the Burke and Amelia monazites; CA-TIMS analyses yielded high-precision U–Pb plateau ages for Madagascar and Amelia monazites. Jefferson County, Elk Mountain and 554 yielded more complex results and no U–Pb plateau ages. Third, chemical analysis of partial-dissolution steps reveals heterogeneous age and compositional data for annealed samples. Because not-annealed samples yielded more consistent age and compositional data, high-temperature annealing is not recommended for monazite. Instead, optimal TIMS results are provided by slow, partial dissolution of monazite in weak acid.
► High temperature annealing reduces the solubility of monazite. ► Multi-step CA-TIMS approach yields high-precision plateau ages. ► Chemical analysis shows complex age and composition data for annealed samples. ► Not-annealed samples yield more consistent age and compositional data.</abstract><pub>Elsevier B.V</pub><doi>10.1016/j.chemgeo.2012.04.006</doi><tpages>16</tpages></addata></record> |
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| source | Elsevier ScienceDirect Journals |
| subjects | Abrasion Abrasion resistance Age Annealing Chemical abrasion chemical analysis Dissolution Geochronology ionization mass spectrometry Monazite Mountains plateaus rare earth elements solubility temperature U–Pb |
| title | Multi-step TIMS and CA-TIMS monazite U–Pb geochronology |
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