中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
Zinc isotope constraints on carbonated mantle sources for rejuvenated-stage lavas from Kaua?i, Hawai?i

文献类型:期刊论文

作者Yao, Junhua1,4,5; Huang, Jian3; Zhang, Guoliang2,4,5
刊名CHEMICAL GEOLOGY
出版日期2022-09-05
卷号605页码:14
ISSN号0009-2541
关键词Hawaiian rejuvenated-stage lavas Zn isotopes Deep carbon cycle Kaua ?i
DOI10.1016/j.chemgeo.2022.120967
通讯作者Zhang, Guoliang(zhangguoliang@qdio.ac.cn)
英文摘要Sedimentary carbonates could be transported into Earth's mantle by plate subduction, but the ultimate fate of these carbonates remains unclear. Zinc isotopes can allow the tracing of recycled isotopically heavy Zn-rich sedimentary carbonates (??66Zn up to 0.91%o) within the mantle. This study presents new whole-rock majorand trace-element geochemical and Sr???Nd???Pb???Hf???Zn isotopic data for a complete series of rejuvenated-stage alkaline samples from Kaua??i, Hawai??i. These samples have high MgO contents (MgO 8.6 wt%) and show a wide range of whole-rock geochemical compositions, with lower SiO2 contents, higher alkali element contents, higher CaO/Al2O3 values at a given MgO content, more depleted Sr???Nd???Hf isotopic compositions, and more radiogenic Pb isotopic compositions relative to shield tholeiites. The trace-element compositions of these samples have some similarities to carbonatites, including large ion lithophile element enrichments and K, Pb, and Zr???Hf depletions. These samples also have systematically higher ??66Zn values (0.34???0.43%o) than shield tholeiites from the Kaua??i (0.27 ?? 0.04%o) and K????lauea Iki lava lake (0.26???0.30%o) and normal mantle (0.18 ?? 0.05%o). Modeling the elemental and isotopic behavior of Zn indicates that the heavy Zn isotopic compositions of these samples reflect the nature of their mantle source rather than any processes associated with mantle melting and fractional crystallization. The low 87Sr/86Sr and heavy Zn isotopic compositions of these alkaline samples can be replicated by mixing depleted mantle with minor amounts of sedimentary Mg???carbonates (<5%). A decrease in whole-rock SiO2 contents from the alkaline basalts to the melilitites in this region correlates with increases in the geochemical signature of sedimentary carbonate-bearing enriched components (e.g., high ??66Zn and low ??Nd and ??Hf values). The correlation between the ??66Zn and 206Pb/204Pb values of the samples is in concert with the role of recycled carbonates that could elevate the U/Pb ratio of mantle component caused by the carbonated melt. This implies that the studied samples formed from magmas derived from a mixed mantle source at least containing depleted peridotite and sedimentary carbonate-bearing components. The addition of recycled sedimentary carbonates may be a key factor for the high ??66Zn and 206Pb/204Pb values of the Kaua??i rejuvenated-stage lavas. These findings suggest that the subducted sedimentary carbonates could accompany the whole circle of recycling of oceanic slab and experience a recycle deep-to-lower mantle in the Hawaiian mantle plume.
资助项目National Natural Science Foundation of China[41876040] ; National Natural Science Foundation of China[41888101] ; Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology[MGQNLM-TD201806] ; Natural Science Foundation of Shandong Province[ZR2020MD070] ; Taishan Scholars Program of Shandong Province[tsqn201909157]
WOS研究方向Geochemistry & Geophysics
语种英语
出版者ELSEVIER
WOS记录号WOS:000810952500003
源URL[http://ir.qdio.ac.cn/handle/337002/179551]  
专题海洋研究所_深海极端环境与生命过程研究中心
通讯作者Zhang, Guoliang
作者单位1.Guangdong Prov Key Lab Marine Resources & Coastal, Zhuhai 519000, Peoples R China
2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266000, Peoples R China
3.Univ Sci & Technol China, Sch Earth & Space Sci, CAS Key Lab Crust Mantle Mat & Environm, Hefei 230026, Peoples R China
4.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao 266071, Peoples R China
5.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Qingdao 266071, Peoples R China
推荐引用方式
GB/T 7714
Yao, Junhua,Huang, Jian,Zhang, Guoliang. Zinc isotope constraints on carbonated mantle sources for rejuvenated-stage lavas from Kaua?i, Hawai?i[J]. CHEMICAL GEOLOGY,2022,605:14.
APA Yao, Junhua,Huang, Jian,&Zhang, Guoliang.(2022).Zinc isotope constraints on carbonated mantle sources for rejuvenated-stage lavas from Kaua?i, Hawai?i.CHEMICAL GEOLOGY,605,14.
MLA Yao, Junhua,et al."Zinc isotope constraints on carbonated mantle sources for rejuvenated-stage lavas from Kaua?i, Hawai?i".CHEMICAL GEOLOGY 605(2022):14.

入库方式: OAI收割

来源:海洋研究所

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