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Marine Carbonate Component in the Mantle Beneath the Southeastern Tibetan Plateau: Evidence From Magnesium and Calcium Isotopes
Liu, Fang1,2; Li, Xin1; Wang, Guiqin1; Liu, Yufei1,2; Zhu, Hongli1,2; Kang, Jinting1,3; Huang, Fang3; Sun, Weidong4,5; Xia, Xiaoping1; Zhang, Zhaofeng1
2017-12-01
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
ISSN2169-9313
Volume122Issue:12Pages:9729-9744
Corresponding AuthorZhang, Zhaofeng(zfzhang@gig.ac.cn)
AbstractTracing and identifying recycled carbonates is a key issue to reconstruct the deep carbon cycle. To better understand carbonate subduction and recycling beneath the southeastern Tibetan Plateau, high-K cal-alkaline volcanic rocks including trachy-basalts and trachy-andesites from Tengchong were studied using Mg and Ca isotopes. The low Mg-26 (-0.310.03 to -0.380.03) and Ca-44/40 (0.67 +/- 0.07 parts per thousand to 0.80 +/- 0.04 parts per thousand) values of these volcanic rocks compared to those of the mantle (-0.25 +/- 0.07 parts per thousand and 0.94 +/- 0.05 parts per thousand, respectively) indicate the incorporation of isotopically light materials into the mantle source, which may be carbonate-bearing sediments with low Mg-26 and Ca-44/40 values. In addition, no correlations of Mg-26 and Ca-44/40 with either SiO2 contents or trace element abundance ratios (e.g., Sm/Yb and Ba/Y) were observed, suggesting that limited Mg and Ca isotopic fractionation occurred during cal-alkaline magmatic differentiation. A binary mixing model using Mg-Ca isotopes shows that 5-8% carbonates dominated primarily by dolostone were recycled back into the mantle. Since Tengchong volcanism is still active and probably related to ongoing plate tectonic movement, we propose that the recycled carbonates are derived from oceanic crust related to the ongoing subduction of the Indian plate.
Keywordcarbonate recycling Mg and Ca isotopes trachy-basalt trachy-andesite southeastern Tibet
DOI10.1002/2017JB014206
Indexed BySCI
Language英语
Funding ProjectChinese Academy of Sciences[XDB18000000] ; National Natural Science Foundation of China[41373007] ; National Natural Science Foundation of China[91328204] ; State Key Laboratory of Geological Processes and Mineral Resources[GPMR201708]
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000423129200046
PublisherAMER GEOPHYSICAL UNION
Citation statistics
Cited Times:26[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/157802
Collection深海极端环境与生命过程研究中心
Corresponding AuthorZhang, Zhaofeng
Affiliation1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou, Guangdong, Peoples R China
2.Univ Chinese Acad Sci, Beijing, Peoples R China
3.Univ Sci & Technol China, Sch Earth & Space Sci, Key Lab Crust Mantle Mat & Environm, Hefei, Anhui, Peoples R China
4.Chinese Acad Sci, Inst Oceanog, Ctr Deep Sea Res, Qingdao, Peoples R China
5.Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Liu, Fang,Li, Xin,Wang, Guiqin,et al. Marine Carbonate Component in the Mantle Beneath the Southeastern Tibetan Plateau: Evidence From Magnesium and Calcium Isotopes[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2017,122(12):9729-9744.
APA Liu, Fang.,Li, Xin.,Wang, Guiqin.,Liu, Yufei.,Zhu, Hongli.,...&Zhang, Zhaofeng.(2017).Marine Carbonate Component in the Mantle Beneath the Southeastern Tibetan Plateau: Evidence From Magnesium and Calcium Isotopes.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,122(12),9729-9744.
MLA Liu, Fang,et al."Marine Carbonate Component in the Mantle Beneath the Southeastern Tibetan Plateau: Evidence From Magnesium and Calcium Isotopes".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 122.12(2017):9729-9744.
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