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<front>
<journal-meta>
<journal-id journal-id-type="publisher">EGUsphere</journal-id>
<journal-title-group>
<journal-title>EGUsphere</journal-title>
<abbrev-journal-title abbrev-type="publisher">EGUsphere</abbrev-journal-title>
<abbrev-journal-title abbrev-type="nlm-ta">EGUsphere</abbrev-journal-title>
</journal-title-group>
<publisher><publisher-name>Copernicus Publications</publisher-name>
<publisher-loc>Göttingen, Germany</publisher-loc>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="doi">10.5194/egusphere-2026-5408</article-id>
<title-group>
<article-title>Technical note: Pyrite (U,Th)-He geochronology using scanning fiber-laser He extraction: analytical workflow and case studies from two orogenic gold systems in the Russian Far East</article-title>
</title-group>
<contrib-group><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Yakubovich</surname>
<given-names>Olga V.</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Vasilyeva</surname>
<given-names>Nadezhda A.</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Pushkina</surname>
<given-names>Ekaterina S.</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Sokolova</surname>
<given-names>Lidia A.</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Gorokhovskiy</surname>
<given-names>Boris M.</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Kotov</surname>
<given-names>Alexander B.</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Adamskaya</surname>
<given-names>Elena V.</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Anosova</surname>
<given-names>Maria O.</given-names>
</name>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Vatrushkina</surname>
<given-names>Elena V.</given-names>
</name>
<xref ref-type="aff" rid="aff4">
<sup>4</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Akinin</surname>
<given-names>Vyacheslav V.</given-names>
</name>
<xref ref-type="aff" rid="aff5">
<sup>5</sup>
</xref>
</contrib>
</contrib-group><aff id="aff1">
<label>1</label>
<addr-line>Institute of Precambrian Geology and Geochronology (IPGG) RAS, Saint Petersburg, 199034, Russia</addr-line>
</aff>
<aff id="aff2">
<label>2</label>
<addr-line>Saint Petersburg State University (SPbU), Saint Petersburg, 199034, Russia</addr-line>
</aff>
<aff id="aff3">
<label>3</label>
<addr-line>Vernadsky Institute of Geochemistry and Analytical Chemistry (GEOKHI) RAS, Moscow, 119991, Russia</addr-line>
</aff>
<aff id="aff4">
<label>4</label>
<addr-line>Geological Institute RAS, Moscow, 119017, Russia</addr-line>
</aff>
<aff id="aff5">
<label>5</label>
<addr-line>North-East Interdisciplinary Scientific Research Institute n. a. N. A. Shilo (NEISRI) RAS, Magadan, 685000, Russia</addr-line>
</aff>
<pub-date pub-type="epub">
<day>09</day>
<month>10</month>
<year>2026</year>
</pub-date>
<volume>2026</volume>
<fpage>1</fpage>
<lpage>19</lpage>
<permissions>
<copyright-statement>Copyright: &#x000a9; 2026 Olga V. Yakubovich et al.</copyright-statement>
<copyright-year>2026</copyright-year>
<license license-type="open-access">
<license-p>This work is licensed under the Creative Commons Attribution 4.0 International License. To view a copy of this licence, visit <ext-link ext-link-type="uri"  xlink:href="https://creativecommons.org/licenses/by/4.0/">https://creativecommons.org/licenses/by/4.0/</ext-link></license-p>
</license>
</permissions>
<self-uri xlink:href="https://egusphere.copernicus.org/preprints/2026/egusphere-2026-5408/">This article is available from https://egusphere.copernicus.org/preprints/2026/egusphere-2026-5408/</self-uri>
<self-uri xlink:href="https://egusphere.copernicus.org/preprints/2026/egusphere-2026-5408/egusphere-2026-5408.pdf">The full text article is available as a PDF file from https://egusphere.copernicus.org/preprints/2026/egusphere-2026-5408/egusphere-2026-5408.pdf</self-uri>
<abstract>
<p>This study presents a new analytical approach to (U,Th)-He dating of individual pyrite grains. We demonstrate that a widely available commercial fiber-laser marking system operated in scanning mode can efficiently extract radiogenic He from pyrite encapsulated in quartz ampoules. The ampoules retain the thermal decomposition products and associated parent nuclides, allowing U and Th to be subsequently determined in the same material from which He was extracted. The proposed extraction technique was validated using pyrite from two gold-bearing sites in the Russian Far East: the Pavlik orogenic gold deposit in the Magadan Region and the Upryamoe gold occurrence, Chukotka. The resulting pyrite (U,Th)-He ages are 139.3 &amp;plusmn; 1.7 Ma (MSWD = 2.5; n = 7) and 125.4 &amp;plusmn; 2.1 Ma (MSWD = 0.87; n = 5), respectively. Compared with the previously developed high-vacuum furnace procedure, the scanning fiber-laser approach increases the analytical throughput of pyrite (U,Th)-He dating by approximately an order of magnitude, allowing up to eight samples to be analysed per day. By making individual-grain age determinations faster and operationally simpler, the method enables larger datasets to be acquired and thereby improves the statistical characterization of pyrite ages from a range of geological settings.</p>
</abstract>
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<funding-group>
<award-group id="gs1">
<funding-source>Russian Science Foundation</funding-source>
<award-id>26-17-00376</award-id>
</award-group>
</funding-group>
</article-meta>
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