{"id":39427,"date":"2025-10-15T08:50:38","date_gmt":"2025-10-15T06:50:38","guid":{"rendered":"https:\/\/karmaka.de\/?p=39427"},"modified":"2025-10-15T08:50:45","modified_gmt":"2025-10-15T06:50:45","slug":"a-sub-chondritic-nickel-stable-isotope-composition-of-mars","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=39427","title":{"rendered":"A sub-chondritic nickel stable isotope composition of Mars<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>Ke Zhu, Martijn Klaver, Wei-Biao Hsu, Harry Becker, Lu Chen, Qi Chen<\/p>\n\n\n\n<p>Geochimica et Cosmochimica Acta<br>Available online 14 October 2025<\/p>\n\n\n\n<p><a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S001670372500540X\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK + PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;To understand accretion and differentiation of Mars, we report high-precision mass-dependent Ni (siderophile and chalcophile) isotope data of 37 bulk Martian meteorites. Large \u03b460\/58Ni variations observed among these Martian meteorites are attributed primarily to magmatism and Ni diffusion in zoned olivine and sulfide. Shergottites show systematically higher Mg# and lower \u03b460\/58Ni values relative to nakhlites, which can be caused by olivine crystallization, consistent with the Ni isotope fractionation factor between olivine and melt. Two Ni-rich chassignites (Martian dunites) provide the best current estimate of the upper limit of \u03b460\/58Ni of bulk silicate Mars (BSM): 0.110\u202f\u00b1\u202f0.031\u202f\u2030, since olivine crystallization causes Ni isotope fractionation. Subtracting a presumably chondritic contribution by late accretion, the proto-BSM should possess a \u03b460\/58Ni of\u202f\u2264\u202f0.074\u202f\u2030 that is lower than the average of chondrites (\u223c0.24\u202f\u2030). This sub-chondritic value of Martian mantle suggests the sulfur-rich core formation has not caused Ni isotope fractionation, because the sulfide and Martian sulfur-rich core is believed to enrich in light Ni isotopes. Instead, Ni isotope differences between Earth, Mars, Vesta, and the ureilites can be inherited from non-bulk chondritic precursor materials.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ke Zhu, Martijn Klaver, Wei-Biao Hsu, Harry Becker, Lu Chen, Qi Chen Geochimica et Cosmochimica ActaAvailable online 14 October 2025 LINK + PDF (OPEN ACCESS) &#8220;To understand accretion and differentiation of Mars, we report high-precision&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3180,45,122,42,46,43],"tags":[4616,1463,2795,5393,1831,1858,2254,1828,1830,5808,4615,1829],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/39427"}],"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=39427"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/39427\/revisions"}],"predecessor-version":[{"id":39428,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/39427\/revisions\/39428"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=39427"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=39427"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=39427"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}