A comparison of amorphous calcium carbonate crystallization in aqueous solutions of MgCl2 and MgSO4: implications for paleo-ocean chemistry

doi:10.1007/s00710-017-0528-9

CORC > 海洋研究所 > 中国科学院海洋研究所 > 海洋地质与环境重点实验室

	A comparison of amorphous calcium carbonate crystallization in aqueous solutions of MgCl2 and MgSO4: implications for paleo-ocean chemistry
	Han, Mei 1,2; Zhao, Yanyang 1; Zhao, Hui 2,3; Han, Zuozhen 1; Yan, Huaxiao 2,3; Sun, Bin 1; Meng, Ruirui 1; Zhuang, Dingxiang 1; Li, Dan 1; Liu, Binwei 1
刊名	MINERALOGY AND PETROLOGY
	2018-04-01
卷号	112 期号:2 页码:229-244
关键词	Amorphous calcium carbonate Mg calcite Aragonite Mg sulfate Mg chloride Spherulitic growth
ISSN号	0930-0708
DOI	10.1007/s00710-017-0528-9
通讯作者	Han, Zuozhen(hanzuozhen65@126.com)
英文摘要	Based on the terminology of "aragonite seas" and "calcite seas", whether different Mg sources could affect the mineralogy of carbonate sediments at the same Mg/Ca ratio was explored, which was expected to provide a qualitative assessment of the chemistry of the paleo-ocean. In this work, amorphous calcium carbonate (ACC) was prepared by direct precipitation in anhydrous ethanol and used as a precursor to study crystallization processes in MgSO4 and MgCl2 solutions having different concentrations at 60 A degrees C (reaction times 240 and 2880 min). Based on the morphology of the aragonite crystals, as well as mineral saturation indices and kinetic analysis of geochemical processes, it was found that these crystals formed with a spherulitic texture in 4 steps. First, ACC crystallized into columnar Mg calcite by nearly oriented attachment. Second, the Mg calcite changed from columnar shapes into smooth dumbbell forms. Third, the Mg calcite transformed into rough dumbbell or cauliflower-shaped aragonite forms by local dissolution and precipitation. Finally, the aragonite transformed further into spherulitic radial and irregular aggregate forms. The increase in Ca2+ in the MgSO4 solutions compared with the MgCl2 solutions indicates the fast dissolution and slow precipitation of ACC in the former solutions. The phase transition was more complete in the 0.005 M MgCl2 solution, whereas Mg calcite crystallized from the 0.005 M MgSO4 solution, indicating that Mg calcite could be formed more easily in an MgSO4 solution. Based on these findings, aragonite and Mg calcite relative to ACC could be used to provide a qualitative assessment of the chemistry of the paleo-ocean. Therefore, calcite seas relative to high-Mg calcite could reflect a low concentration MgSO4 paleo-ocean, while aragonite seas could be related to an MgCl2 or high concentration of MgSO4 paleo-ocean.
资助项目	National Natural Science Foundation of China[41372108] ; National Natural Science Foundation of China[U1663201] ; Open Fund of the Key Laboratory of Marine Geology and Environment, Chinese Academy of Sciences[MGE2016KG10] ; National Key Basic Research Development Program (973 Program)[2012 CB723104] ; Specialized Research Fund for the Doctoral Program of Higher Education[20133718130001] ; SDUST Research Fund[2015TDJH101] ; Scientific and Technological Innovation Project - Qingdao National Laboratory for Marine Science and Technology[2016ASKJ13] ; Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary Minerals[DMSM201412] ; Shandong Province Natural Science Foundation[ZR2014DM005] ; China Postdoctoral Science Foundation Funded Project[2013M540560] ; China Postdoctoral Science Foundation Funded Project[2014T70659] ; China Postdoctoral Science Foundation Funded Project[2016M600548] ; China Postdoctoral Science Foundation Funded Project[2017T100502] ; Qingdao Postdoctoral Applied Research Project[2015199]
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
语种	英语
出版者	SPRINGER WIEN
WOS记录号	WOS:000428443200006
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/158668]
专题	海洋研究所_海洋地质与环境重点实验室
通讯作者	Han, Zuozhen
作者单位	1.Shandong Univ Sci & Technol, Coll Earth Sci & Engn, Shandong Prov Key Lab Deposit Mineralizat & Sedim, Qingdao 266590, Peoples R China 2.Chinese Acad Sci, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 3.Shandong Univ Sci & Technol, Dept Bioengn, Coll Chem & Environm Engn, Qingdao 266590, Peoples R China
推荐引用方式 GB/T 7714	Han, Mei,Zhao, Yanyang,Zhao, Hui,et al. A comparison of amorphous calcium carbonate crystallization in aqueous solutions of MgCl2 and MgSO4: implications for paleo-ocean chemistry[J]. MINERALOGY AND PETROLOGY,2018,112(2):229-244.
APA	Han, Mei.,Zhao, Yanyang.,Zhao, Hui.,Han, Zuozhen.,Yan, Huaxiao.,...&Liu, Binwei.(2018).A comparison of amorphous calcium carbonate crystallization in aqueous solutions of MgCl2 and MgSO4: implications for paleo-ocean chemistry.MINERALOGY AND PETROLOGY,112(2),229-244.
MLA	Han, Mei,et al."A comparison of amorphous calcium carbonate crystallization in aqueous solutions of MgCl2 and MgSO4: implications for paleo-ocean chemistry".MINERALOGY AND PETROLOGY 112.2(2018):229-244.