IOCAS-IR  > 海洋地质与环境重点实验室
High-Ca vent fluids discharged from the Lutao arc volcanic hydrothermal system are associated with albitization and recycling of marine carbonate
Chen, Xue-Gang1; Yu, Ming-Zhen1,2; Qiu, Zhongyan3; Loh, Pei-Sun1; Chen, Chen-Tung Arthur1,4; Garbe-Schonberg, Dieter5; Schmidt, Mark6; Wang, Xiaoyuan7,8,9; Ye, Ying1
2021-12-20
Source PublicationCHEMICAL GEOLOGY
ISSN0009-2541
Volume585Pages:18
Corresponding AuthorChen, Xue-Gang(chenxg83@zju.edu.cn)
AbstractThe chemical and isotopic characteristics of calcium (Ca) in subduction zones are closely related to the budget of Ca and carbon cycles. Here we investigate the ultra-high Ca concentrations that characterize the hydrothermal fluids discharged from two types of vents, named the Zhudanqu brine vent (ZDQ) and the Huwaichi vapor spring (HWC), in the Lutao hydrothermal system at the north Luzon arc. The Ca concentrations of up to 159 mM and Ca/Cl ratio of up to 0.26 in the ZDQ vent fluids are possibly the highest ever reported for Ca enrichment in global seawater-circulated hydrothermal/geothermal systems. The differences in chemical compositions between the ZDQ and the HWC vent fluids are primary controlled by subcritical phase separation. The brine phase constitutes the ZDQ vent fluids, while the HWC vent fluids represent mixtures of the vapor phase and seawater. Both the vapor and the brine phases exhibit similar delta Ca-44/40 values (0.72 +/- 0.05 parts per thousand), suggesting no significant Ca isotope fractionation has occurred during phase separation. The hydrothermal endmember before phase separation (the "Lutao endmember") presents depletions of 213 +/- 15 mM of Na, 24.4 +/- 0.4 mM of SO42-, and 10.2 mM of K, and enrichment of 130.2 +/- 5.5 mM of Ca with respect to the percolated seawater. The total gained Ca is 154.6 +/- 5.9 mM with a delta Ca-44/40 value of 0.67 parts per thousand-0.77 parts per thousand (0.72 +/- 0.05%), considering anhydrite precipitation during hydrothermal circulation. The Holocene raised coral reef is unlikely to contribute substantial Ca into the Lutao system. Much of the gained Ca (111.6 +/- 7.5 mM) is produced by high-degree albitization of the Lutao host rock, which is promoted by the low water/rock ratio (similar to 2), slightly alkaline conditions, and relatively lower temperature of the Lutao system with respect to most mid-ocean ridge hydrothermal systems. Ca derived from this process inherits the Ca isotopes of plagioclase in the Lutao host rocks (delta Ca-44/40 = 0.82 +/- 0.06 parts per thousand). According to mass and isotopic balances, the recycled marine carbonate is proposed to contribute 43 +/- 13.4 mM Ca with a delta Ca-44/40 value of 0.46(-0.63)(+0.35)parts per thousand into the Lutao system. Such isotopically lighter Ca is derived from either pore fluids expulsed from underlying Philippine Sea sediments, or more probably, carbonate-bearing subduction fluids from the subducting South China Sea sediments and slab. The carbonate solubility in the subduction fluids could maintain at 600 mM near the reaction zone. The carbonate-rich fluids were subsequently migrated into the Lutao reaction zone and released an additional 43 +/- 13.4 mM Ca via dolomitization. A small amount (similar to 9%) addition of carbonate-rich fluids would not significantly change the budgets of Na, Mg, and Cl but could generate substantial Ca enrichment and Ca isotopic variations.
KeywordPhase separation Albitization Hydrothermal fluids Subduction zone Calcium isotope Carbon cycle
DOI10.1016/j.chemgeo.2021.120583
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China (NSFC)[41806051] ; National Natural Science Foundation of China (NSFC)[U1805242] ; National Natural Science Foundation of China (NSFC)[41976075] ; Strategic Priority Research Program (B) of Chinese Academy of Sciences[XDB42020402] ; Shandong Provincial Natural Science Foundation, China[ZR2020MD068] ; China Ocean Mineral R&D Association (COMRA) project[DY135-S2-0103] ; Aim for the Top University Program of Taiwan[03C0302]
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000712225100010
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/177258
Collection海洋地质与环境重点实验室
Corresponding AuthorChen, Xue-Gang
Affiliation1.Zhejiang Univ, Ocean Coll, Zhoushan 316021, Peoples R China
2.Harvard Univ, Dept Earth & Planetary Sci, 20 Oxford St, Cambridge, MA 02138 USA
3.Minist Nat Resources, Inst Oceanog 2, Key Lab Submarine Geosci, Hangzhou 310012, Peoples R China
4.Natl Sun Yat Sen Univ, Dept Oceanog, Kaohsiung 804, Taiwan
5.Christian Albrechts Univ Kiel, Inst Geowissensch, D-24118 Kiel, Germany
6.GEOMAR Helmholtz Ctr Ocean Res Kiel, D-24148 Kiel, Germany
7.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China
8.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266061, Peoples R China
9.Chinese Acad Sci, Ctr Ocean Mega Sci, Qingdao 266071, Peoples R China
Recommended Citation
GB/T 7714
Chen, Xue-Gang,Yu, Ming-Zhen,Qiu, Zhongyan,et al. High-Ca vent fluids discharged from the Lutao arc volcanic hydrothermal system are associated with albitization and recycling of marine carbonate[J]. CHEMICAL GEOLOGY,2021,585:18.
APA Chen, Xue-Gang.,Yu, Ming-Zhen.,Qiu, Zhongyan.,Loh, Pei-Sun.,Chen, Chen-Tung Arthur.,...&Ye, Ying.(2021).High-Ca vent fluids discharged from the Lutao arc volcanic hydrothermal system are associated with albitization and recycling of marine carbonate.CHEMICAL GEOLOGY,585,18.
MLA Chen, Xue-Gang,et al."High-Ca vent fluids discharged from the Lutao arc volcanic hydrothermal system are associated with albitization and recycling of marine carbonate".CHEMICAL GEOLOGY 585(2021):18.
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