{"refrec":{"BRefID":382848,"RR":"<b>Flipkens, G.; Fuhr, M.; Fiers, G.; Meysman, F.J.R.; Town, R.M.; Blust, R.</b> (2023). Enhanced olivine dissolution in seawater through continuous grain collisions. <i>Geochim. Cosmochim. Acta 359</i>: 84-99. <a href=\"https://dx.doi.org/10.1016/j.gca.2023.09.002\" target=\"_blank\">https://dx.doi.org/10.1016/j.gca.2023.09.002</a>","BEntID":380590,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Geochim. Cosmochim. Acta 359</i>: 84-99. <a href=\"https://dx.doi.org/10.1016/j.gca.2023.09.002\" target=\"_blank\">https://dx.doi.org/10.1016/j.gca.2023.09.002</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Flipkens, G.; Fuhr, M.; Fiers, G.; Meysman, F.J.R.; Town, R.M.; Blust, R.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Flipkens, G. <i>et al.</i>","Englishabstract":"<p style=\"margin-left:0in;\"><span style=\"color:#1F1F1F;\">Carbon dioxide removal&nbsp;(CDR)&nbsp;</span><a href=\"https://www.sciencedirect.com/topics/earth-and-planetary-sciences/science-and-technology\"><span style=\"color:#1F1F1F;\">technologies</span></a><span style=\"color:#1F1F1F;\">&nbsp;at a gigaton scale need to be developed and implemented within the next decades to keep&nbsp;</span>global warming&nbsp;below 1.5&nbsp;°C. Coastal enhanced silicate weathering is one of the proposed CDR techniques that aims to accelerate the natural process of CO<sub>2</sub><span style=\"color:#1F1F1F;\">-sequestration during marine chemical weathering of&nbsp;silicate minerals. To this end, finely ground rock containing olivine (Mg<i><sub>x</sub></i>Fe<sub>2−</sub><i><sub>x</sub></i>SiO<sub>4</sub>) could be dispersed in dynamic coastal environments, where local biotic and&nbsp;abiotic factors&nbsp;potentially enhance the weathering process. However, accurate predictions of the olivine dissolution rate and the associated CO<sub>2</sub>&nbsp;sequestration under&nbsp;<i>in situ</i>&nbsp;conditions are currently lacking and ecosystem impacts remain to be assessed. Previously, it has been hypothesized that&nbsp;<i>in situ</i>&nbsp;grain collisions, induced by bed load transport due to currents and waves, could accelerate the&nbsp;<i>in situ</i>&nbsp;chemical weathering of olivine particles. To examine this, we investigated the effects of continuous grain tumbling on olivine dissolution in natural seawater. A 70-day experiment was conducted in which&nbsp;forsterite&nbsp;olivine sand was continuously tumbled in filtered seawater at different rotation speeds, and dissolution rates were measured on a weekly basis. Results showed that continuously tumbled olivine dissolved 8 to 19 times faster compared to stagnant (no rotation) conditions. Olivine dissolution was complete and stoichiometric (except for Ni release), air-seawater CO<sub>2</sub>&nbsp;exchange was not significantly rate limiting, and minimal particle fragmentation and secondary mineral formation were observed. Hence, we infer that olivine weathering was mainly enhanced via advective&nbsp;pore water&nbsp;flushing, which limits saturation effects at the grain scale. Overall, this study provides evidence that ambient physical stresses in coastal environments could enhance marine silicate weathering, which has implications for both the natural silicon cycle as well as the use of enhanced coastal weathering of silicates as a CDR technique.</span>","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Enhanced olivine dissolution in seawater through continuous grain collisions","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-04-27 01:32:48.064321","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"Olivine; Ocean alkalinization; Silicate weathering; Climate change mitigation","OtherDescriptors":null,"Notes":null,"AnaPub":2023,"MonPub":null,"DateUpdate":"2024-02-19","DateCreate":"2024-02-16","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:001081586000001","VABBcode":null,"OpenAcc":1,"DOI":"10.1016/j.gca.2023.09.002"},"refs":null,"anarec":{"AnaID":382848,"PubliDate":2023,"Pagination":"84-99","XtraPublOfAnaID":null,"ISBN":null,"Volume":"359","Issue":null,"BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":42901,"SerRR":"Geochimica et Cosmochimica Acta. 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