Potassium isotopic fractionation during multistage alteration of oceanic crust in the southern Mariana Trench | |
Liu, Ya-Dong2; Guo, Zixiao1,2; Tian, Heng-Ci4; Qin, Guohong2; Peng, Xiaotong3 | |
刊名 | CHEMICAL GEOLOGY |
2023-03-20 | |
卷号 | 620页码:1 |
关键词 | K isotopes Southern Mariana Trench Oceanic basalts Multistage alteration Secondary minerals |
ISSN号 | 1872-6836 |
通讯作者 | Guo, Zixiao ; Peng, Xiaotong |
文献子类 | 期刊论文 |
英文摘要 | To further constrain the migration trajectory of K isotopes during oceanic crust alteration, we present detailed mineral, elemental, and K isotopic data of oceanic crust samples from the southern Mariana Trench. These samples are divided into four groups with various colors and alteration intensities, in which secondary mineral assemblages indicate a progressive alteration of oceanic crust at low temperatures (<100 degrees C). Group I samples are fresh basalts with chemical compositions identical to the mid-ocean ridge basalts (MORBs). Their higher 841K values (0.08%o to 0.11%o) than MORBs (-0.44 +/- 0.17%o) might point to a 41K-enriched magmatic source. Group II samples are slightly altered basalts at the initial stage of low-temperature alteration and have lower 841K values (-0.31%o to 0.05%o) than Group I, which are interpreted as a result of chemical exchange with seawater via equilibrium and kinetic isotopic fractionations. Group III samples are celadonite phase-dominated rocks at the second stage. They have higher K2O contents (3.53-8.39 wt%) and lower 841K values (-0.71%o to -0.45%o) than Group II, reflecting the preferential incorporation of isotopically light K. In contrast, the clay mineral phase at the late stage dominates Group IV samples with lower K2O contents (1.79-4.20 wt%) and higher 841K values (-0.22%o to -0.07%o) than Group III, indicating a loss of isotopically light K during the transformation of the high-K celadonite phase to the low-K clay mineral phase. Overall, systemic variations in secondary minerals, K2O contents, and 841K values from Group I to Group IV samples suggest a multistage K isotopic fractionation and shed new light on a key role of the high-K celadonite phase in K isotopic behavior during oceanic crust alteration. |
WOS研究方向 | Geochemistry & Geophysics |
语种 | 英语 |
WOS记录号 | WOS:000927419900001 |
内容类型 | 期刊论文 |
版本 | 出版稿 |
源URL | [http://ir.idsse.ac.cn/handle/183446/10173] |
专题 | 深海科学研究部_深海地质与地球化学研究室 |
通讯作者 | Guo, Zixiao; Peng, Xiaotong |
作者单位 | 1.UCL, Dept Earth Sci, London WC1E 6BT, England; 2.Hebei Normal Univ, Sch Geog Sci, Hebei Key Lab Environm Change & Ecol Construct, Shijiazhuang 050024, Peoples R China; 3.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya 572000, Peoples R China; 4.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing 100029, Peoples R China |
推荐引用方式 GB/T 7714 | Liu, Ya-Dong,Guo, Zixiao,Tian, Heng-Ci,et al. Potassium isotopic fractionation during multistage alteration of oceanic crust in the southern Mariana Trench[J]. CHEMICAL GEOLOGY,2023,620:1. |
APA | Liu, Ya-Dong,Guo, Zixiao,Tian, Heng-Ci,Qin, Guohong,&Peng, Xiaotong.(2023).Potassium isotopic fractionation during multistage alteration of oceanic crust in the southern Mariana Trench.CHEMICAL GEOLOGY,620,1. |
MLA | Liu, Ya-Dong,et al."Potassium isotopic fractionation during multistage alteration of oceanic crust in the southern Mariana Trench".CHEMICAL GEOLOGY 620(2023):1. |
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