Zinc isotope constraints on carbonated mantle sources for rejuvenated-stage lavas from Kaua?i, Hawai?i

doi:10.1016/j.chemgeo.2022.120967

	Zinc isotope constraints on carbonated mantle sources for rejuvenated-stage lavas from Kaua?i, Hawai?i
	Yao, Junhua 1,3,5; Huang, Jian 4; Zhang, Guoliang 1,2,3
	2022-09-05
发表期刊	CHEMICAL GEOLOGY
ISSN	0009-2541
卷号	605 页码:14
通讯作者	Zhang, Guoliang([email protected])
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.
关键词	Hawaiian rejuvenated-stage lavas Zn isotopes Deep carbon cycle Kaua ?i
DOI	10.1016/j.chemgeo.2022.120967
收录类别	SCI
语种	英语
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
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000810952500003
出版者	ELSEVIER
引用统计	被引频次：13[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/179552
专题	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.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Qingdao 266071, Peoples R China 2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266000, Peoples R China 3.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao 266071, Peoples R China 4.Univ Sci & Technol China, Sch Earth & Space Sci, CAS Key Lab Crust Mantle Mat & Environm, Hefei 230026, Peoples R China 5.Guangdong Prov Key Lab Marine Resources & Coastal, Zhuhai 519000, Peoples R China
第一作者单位	深海极端环境与生命过程研究中心; 中国科学院海洋大科学研究中心
通讯作者单位	深海极端环境与生命过程研究中心; 中国科学院海洋大科学研究中心
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.

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