{"id":36033,"date":"2024-04-23T17:45:11","date_gmt":"2024-04-23T15:45:11","guid":{"rendered":"https:\/\/karmaka.de\/?p=36033"},"modified":"2024-04-23T17:45:11","modified_gmt":"2024-04-23T15:45:11","slug":"hf-w-dating-of-zircon-in-mesosiderite-with-high-pressure-sintered-standard","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=36033","title":{"rendered":"Hf-W dating of zircon in mesosiderite with high-pressure sintered standard<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>Yuji Sano, Yuta Koyama, Naoto Takahata, Takuya Matsuzaki, Mizuho Koike, Makiko K. Haba, Shuhei Sakata, Hideharu Kuwahara &amp; Tetsuo Irifune<\/p>\n\n\n\n<p>Journal of Analytical Science and Technology, Research article, Published: 23 April 2024<\/p>\n\n\n\n<p><a href=\"https:\/\/link.springer.com\/article\/10.1186\/s40543-024-00438-0\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK (OPEN ACCESS)<\/strong><\/a><br><a href=\"https:\/\/link.springer.com\/content\/pdf\/10.1186\/s40543-024-00438-0.pdf\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;New standard zircons applicable to in situ analysis of Hf\/W ratio by Nanoscale secondary ion mass spectrometer (NanoSIMS) were prepared and applied to Hf-W dating of a differentiated meteorite classified as mesosiderite. The standard zircons were synthesized by high-pressure experiment from starting materials which were mixture of hafnium oxide, tungsten oxide and high-purity zircon powder. The mixed powders were stirred and pulverized by a high-energy ball mill. They were then sintered at 1000 \u00b0C and 6 GPa using multi-anvil apparatus. Homogeneity of Hf\/W ratios of synthesized zircons was examined by SEM\u2013EDS, EPMA, and Laser Ablation Inductively Coupled Plasma Mass Spectrometer (LA-ICPMS). Hf\/W ratios of the same zircons were measured by a NanoSIMS with 2 nA oxygen primary beam and mass resolving power of 10,000. The relative sensitivity factor (RSF) of Hf\/W ratio was determined by comparing zircon data measured by LA-ICPMS and NanoSIMS. Observed RSF (Hf\/W) of zircon is 0.585\u2009\u00b1\u20090.180 (hereafter all error 2\u03c3) consistent with 0.855\u2009\u00b1\u20090.468 of previous work within experimental error margin. The value is higher than observed RSF of glass matrix, 0.301\u2009\u00b1\u20090.062, and significantly higher than glass data of 0.21\u20130.22 in references. Based on the RSF, the Hf\/W ratios of zircons extracted from mesosiderite \u201cAsuka 882,023\u201d were measured together with W isotopic compositions by NanoSIMS. Observed data in 180Hf\/186W\u2013182W\/186W diagram are fitted by a straight line, yielding a slope (182Hf\/180Hf) of 8.19\u2009\u00b1\u20093.50\u2009\u00d7\u200910\u20136. This slope is converted into an absolute zircon Hf-W age of 4536.5+4.6\u20137.2 Ma using the age anchor of CV3 chondrite. This age agrees well with a reference value of 4532.0+11.4\u201320.8 Ma.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Yuji Sano, Yuta Koyama, Naoto Takahata, Takuya Matsuzaki, Mizuho Koike, Makiko K. Haba, Shuhei Sakata, Hideharu Kuwahara &amp; Tetsuo Irifune Journal of Analytical Science and Technology, Research article, Published: 23 April 2024 LINK (OPEN ACCESS)PDF&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[765,68],"tags":[3561,3273,1812,146,5016,3628,1893,2321,1848,184],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/36033"}],"collection":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=36033"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/36033\/revisions"}],"predecessor-version":[{"id":36034,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/36033\/revisions\/36034"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=36033"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=36033"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=36033"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}