IOCAS-IR  > 海洋地质与环境重点实验室
Thallium isotope systematics in volcanic rocks from St. Helena - Constraints on the origin of the HIMU reservoir
Blusztajn, Jerzy1,2; Nielsen, Sune G.1,2; Marschall, Horst R.2,3; Shu, Yunchao1,4,5; Ostrander, Chadlin M.6; Hanyu, Takeshi7
2018-01-05
Source PublicationCHEMICAL GEOLOGY
ISSN0009-2541
Volume476Pages:292-301
Corresponding AuthorBlusztajn, Jerzy(jblusztajn@whoi.edu)
AbstractIt is generally accepted that subduction of the oceanic crust plays an important role in creation of mantle heterogeneity. HIMU (stands for high mu = ((238) U/Pb-204)) is a rare and probably not volumetrically large mantle component, which is sampled at St. Helena in the Atlantic and in the Cook-Austral Islands in the South Pacific. Previous studies that used radiogenic isotopes have specifically invoked subducted hydrothermally altered oceanic crust (AOC) as a significant component in the source of HIMU. However, because radiogenic isotopes are affected by both parent-daughter fractionation and time that cannot be independently determined, it is difficult to unambiguously use these tracers to determine the source material of the HIMU reservoir. Thallium isotopes can be used to identify the involvement of sediments rich in Mn oxides or AOC, because these two components exhibit high Tl concentrations and highly fractionated Tl isotope compositons, whereas the upper mantle is depleted in Tl and homogenous with respect to Tl isotopes. Here we report Tl isotope data for a suite of St. Helena lavas previously characterized to investigate if the HIMU mantle reservoir can be linked to AOC. Samples show large Tl isotopic variation, from epsilon Tl-205= -9.8 to epsilon Tl-205 = + 3.9 and do not correlate with Sr, Nd, Hf or Pb isotopes. Eight samples have epsilon Tl-205 lighter than the mantle value (epsilon T-205= - 2), with the lightest values similar to those observed for modern AOC. These features are consistent with the presence of different proportions of recycled oceanic crust in the source of St. Helena mantle source. Our results, therefore, support previous studies that inferred AOC as a significant component in the HIMU mantle reservoir and show that the Tl isotopic system can be used as a powerful tracer to detect contributions of AOC in the creation of mantle heterogeneities.
KeywordThallium isotopes St. Helena HIMU Oceanic crust
DOI10.1016/j.chemgeo.2017.11.025
Indexed BySCI
Language英语
Funding ProjectNSF[EAR-1119373] ; NSF[1427310]
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000418472000023
PublisherELSEVIER SCIENCE BV
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/157772
Collection海洋地质与环境重点实验室
Corresponding AuthorBlusztajn, Jerzy
Affiliation1.Woods Hole Oceanog Inst, NIRVANA Labs, Woods Hole, MA 02543 USA
2.Woods Hole Oceanog Inst, Dept Geol & Geophys, Woods Hole, MA 02543 USA
3.Goethe Univ Frankfurt, Inst Geowissensch, Altenhoferalle 1, D-60438 Frankfurt, Germany
4.Chinese Acad Sci, Inst Oceanol, Seafloor Hydrothermal Act Lab, Key Lab Marine Geol & Environm, Qingdao 266071, Shandong, Peoples R China
5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
6.Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ 85287 USA
7.Japan Agcy Marine Earth Sci & Technol, Dept Solid Earth Geochem, Yokosuka, Kanagawa 2370061, Japan
Recommended Citation
GB/T 7714
Blusztajn, Jerzy,Nielsen, Sune G.,Marschall, Horst R.,et al. Thallium isotope systematics in volcanic rocks from St. Helena - Constraints on the origin of the HIMU reservoir[J]. CHEMICAL GEOLOGY,2018,476:292-301.
APA Blusztajn, Jerzy,Nielsen, Sune G.,Marschall, Horst R.,Shu, Yunchao,Ostrander, Chadlin M.,&Hanyu, Takeshi.(2018).Thallium isotope systematics in volcanic rocks from St. Helena - Constraints on the origin of the HIMU reservoir.CHEMICAL GEOLOGY,476,292-301.
MLA Blusztajn, Jerzy,et al."Thallium isotope systematics in volcanic rocks from St. Helena - Constraints on the origin of the HIMU reservoir".CHEMICAL GEOLOGY 476(2018):292-301.
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