Marine Carbonate Component in the Mantle Beneath the Southeastern Tibetan Plateau: Evidence From Magnesium and Calcium Isotopes

doi:10.1002/2017JB014206

QIBEBT-IR

	Marine Carbonate Component in the Mantle Beneath the Southeastern Tibetan Plateau: Evidence From Magnesium and Calcium Isotopes
	Liu, Fang 1,2; Li, Xin 1; Wang, Guiqin 1; Liu, Yufei 1,2; Zhu, Hongli 1,2; Kang, Jinting 1,3; Huang, Fang 3; Sun, Weidong 4,5; Xia, Xiaoping 1; Zhang, Zhaofeng 1
	2017-12-01
发表期刊	JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
ISSN	2169-9313
卷号	122 期号:12 页码:9729-9744
摘要	Tracing 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.
文章类型	Article
关键词	Carbonate Recycling Mg And Ca Isotopes Trachy-basalt Trachy-andesite Southeastern Tibet
WOS标题词	Science & Technology ; Physical Sciences
DOI	10.1002/2017JB014206
关键词[WOS]	TENGCHONG VOLCANIC FIELD ; LARGE IGNEOUS PROVINCE ; CONTINENTAL-CRUST ; CA CYCLE ; ULTRAPOTASSIC ROCKS ; SUBDUCTION ZONES ; OXYGEN ISOTOPES ; MELT INCLUSIONS ; EASTERN CHINA ; INDIAN-OCEAN
收录类别	SCI
语种	英语
WOS研究方向	Geochemistry & Geophysics
项目资助者	Chinese Academy of Sciences(XDB18000000) ; National Natural Science Foundation of China(41373007 ; State Key Laboratory of Geological Processes and Mineral Resources(GPMR201708) ; 91328204)
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000423129200046
出版者	AMER GEOPHYSICAL UNION
引用统计
文献类型	期刊论文
条目标识符	http://ir.qibebt.ac.cn/handle/337004/10538
专题	中国科学院青岛生物能源与过程研究所
通讯作者	Zhang, Zhaofeng
作者单位	1.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
推荐引用方式 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.