{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,28]],"date-time":"2026-02-28T06:01:34Z","timestamp":1772258494065,"version":"3.50.1"},"posted":{"date-parts":[[2018,7,10]]},"group-title":"Biogeochemistry: Stable Isotopes &amp;amp; Other Tracers","reference-count":0,"publisher":"Copernicus GmbH","license":[{"start":{"date-parts":[[2018,7,10]],"date-time":"2018-07-10T00:00:00Z","timestamp":1531180800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100000288","name":"Royal Society","doi-asserted-by":"publisher","award":["RG130386"],"award-info":[{"award-number":["RG130386"]}],"id":[{"id":"10.13039\/501100000288","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"abstract":"<jats:p>Abstract. The silicon isotope composition of deep-sea sponges skeletal element \u2013 spicules \u2013 reflects the silicic acid (DSi) concentration of their surrounding water, and can be used as natural archives of bottom water nutrients. In order to reconstruct the past silica cycle robustly, it is essential to better constrain the mechanisms of biosilicification, which are not yet well understood. Here, we show that the apparent isotopic fractionation (\u220630Si) during spicule formation in deep\u2013sea sponges from the equatorial Atlantic range from \u22126.74\u2009\u2030 to \u22121.50\u2009\u2030 in relatively low DSi concentrations (15 to 35\u2009\u03bcM). The wide range in isotopic composition highlights the potential difference in silicification mechanism between the two major classes, Demospongiae and Hexactinellida. We find the anomalies in the isotopic fractionation correlates with skeletal morphology, whereby fused framework structures, characterised by secondary silicification, exhibit extremely light \u03b430Si signatures. Our results provide insights into the process involved during silica deposition, and indicate that reliable reconstructions of past DSi can only be obtained using silicon isotopes ratios derived from sponges with certain spicule types.<\/jats:p>","DOI":"10.5194\/bg-2018-328","type":"posted-content","created":{"date-parts":[[2018,7,10]],"date-time":"2018-07-10T07:22:16Z","timestamp":1531207336000},"source":"Crossref","is-referenced-by-count":1,"title":["Silicon isotopes of deep-sea sponges: new insights into biomineralisation and skeletal structure"],"prefix":"10.5194","author":[{"given":"Lucie","family":"Cassarino","sequence":"first","affiliation":[]},{"given":"Christopher D.","family":"Coath","sequence":"additional","affiliation":[]},{"given":"Joana R.","family":"Xavier","sequence":"additional","affiliation":[]},{"given":"Katharine R.","family":"Hendry","sequence":"additional","affiliation":[]}],"member":"3145","container-title":[],"original-title":[],"link":[{"URL":"https:\/\/www.biogeosciences-discuss.net\/bg-2018-328\/bg-2018-328.pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,2,1]],"date-time":"2025-02-01T08:01:48Z","timestamp":1738396908000},"score":1,"resource":{"primary":{"URL":"https:\/\/bg.copernicus.org\/articles\/15\/6959\/2018\/bg-15-6959-2018-discussion.html"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2018,7,10]]},"references-count":0,"URL":"https:\/\/doi.org\/10.5194\/bg-2018-328","relation":{"has-comment":[{"id-type":"doi","id":"10.5194\/bg-2018-328-SC1","asserted-by":"subject"},{"id-type":"doi","id":"10.5194\/bg-2018-328-AC1","asserted-by":"subject"},{"id-type":"doi","id":"10.5194\/bg-2018-328-AC2","asserted-by":"subject"},{"id-type":"doi","id":"10.5194\/bg-2018-328-AC3","asserted-by":"subject"},{"id-type":"doi","id":"10.5194\/bg-2018-328-AC4","asserted-by":"subject"}],"has-review":[{"id-type":"doi","id":"10.5194\/bg-2018-328-RC1","asserted-by":"subject"},{"id-type":"doi","id":"10.5194\/bg-2018-328-RC2","asserted-by":"subject"},{"id-type":"doi","id":"10.5194\/bg-2018-328-RC3","asserted-by":"subject"}],"is-preprint-of":[{"id-type":"doi","id":"10.5194\/bg-15-6959-2018","asserted-by":"subject"},{"id-type":"doi","id":"10.5194\/bg-15-6959-2018","asserted-by":"object"}]},"subject":[],"published":{"date-parts":[[2018,7,10]]},"subtype":"preprint"}}