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Mashhad komatiitic rocks in NE Iran: Origin and implications for the evolution of the Paleo-Tethyan Ocean

文献类型：期刊论文

作者Li, Xingbo2,3,4; Miao, Laicheng3,4; Zhang, Fochin3,4; Ghasemi, Habibollah1; Zhu, Shuaiming3,4; Yang, Shunhu3,4
刊名GEOLOGICAL JOURNAL
出版日期2019-11-01
卷号54期号:6页码:3314-3334
关键词mantle plume Mashhad komatiitic rock north-east Iran Paleo-Tethyan Ocean
ISSN号0072-1050
DOI10.1002/gj.3329
英文摘要Mashhad ultramafic volcanic rocks, located within the Paleo-Tethys suture zone in the north-eastern Iran, are composed mainly of komatiitic rocks with interbedded picrobasalts. The Mashhad komatiitic rocks are characterized by low Al2O3/TiO2 ratios (9.85-11.44) and depleted HREE patterns with slightly high (Gd/Yb)(N) ratios (1.48-1.74), similar to those of the Al-depleted Barberton-type komatiites. These rocks have & x190;(Nd) (t) values ranging from +9.0 to +10.4 and initial Sr-87/Sr-86 ratios ranging from 0.7039 to 0.7072, indicating they were derived from a depleted mantle source. They have a total Re-187/Os-188 and Os-187/Os-188 ratios ranging from 0.278 to 72.254 and from 0.12741 to 0.14012, respectively, and display consistent PGE patterns similar to that of the primitive mantle. The picrobasalts have high contents of SiO2 (45.08-48.87 wt.%), MgO (7.28-11.51 wt.%), nearly flat REE pattern, and & x190;(Nd) (t) values ranging from +6.5 to +7.9 and initial Sr-87/Sr-86 ratios focused on 0.7040 and 0.7070, illustrating that they were derived from a relatively enriched source compared with the komatiitic rocks. The thermobarometric calculations suggest that the Mashhad komatiitic rocks were generated by high degree partial melting between 20% and 30% at 1,604-1,681 degrees C and 3.20-4.65 Gpa, essentially consistent with those of the Hawaiian mantle plume (1,500-1,600 degrees C). These new data demonstrate that the Mashhad komatiitic rocks are of a mantle plume origin, which might have caused the opening of the Paleo-Tethyan Ocean, and the mantle plume was likely located beneath or nearby the mid-ridge of the Paleo-Tethyan Ocean when the Mashhad komatiitic lava erupted, a scenario resembling the present Iceland and Ontong Java.
WOS关键词PLATE TECTONIC EVOLUTION ; MANTLE PLUMES ; BARBERTON KOMATIITES ; SOUTHERN MARGIN ; FLOOD-BASALT ; GEOCHEMICAL CHARACTERISTICS ; PLUTONIC COMPLEX ; ZIRCON AGES ; THRUST BELT ; SM-ND
资助项目Key Research Program of Chinese Academy of Sciences[XDPB11] ; National Natural Science Foundation of China[41772230] ; Ministry of Science and Technology of China[2012FY120100]
WOS研究方向Geology
语种英语
WOS记录号WOS:000496020400009
出版者WILEY
资助机构Key Research Program of Chinese Academy of Sciences ; Key Research Program of Chinese Academy of Sciences ; Key Research Program of Chinese Academy of Sciences ; Key Research Program of Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Ministry of Science and Technology of China ; Ministry of Science and Technology of China ; Ministry of Science and Technology of China ; Ministry of Science and Technology of China ; Key Research Program of Chinese Academy of Sciences ; Key Research Program of Chinese Academy of Sciences ; Key Research Program of Chinese Academy of Sciences ; Key Research Program of Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Ministry of Science and Technology of China ; Ministry of Science and Technology of China ; Ministry of Science and Technology of China ; Ministry of Science and Technology of China ; Key Research Program of Chinese Academy of Sciences ; Key Research Program of Chinese Academy of Sciences ; Key Research Program of Chinese Academy of Sciences ; Key Research Program of Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Ministry of Science and Technology of China ; Ministry of Science and Technology of China ; Ministry of Science and Technology of China ; Ministry of Science and Technology of China ; Key Research Program of Chinese Academy of Sciences ; Key Research Program of Chinese Academy of Sciences ; Key Research Program of Chinese Academy of Sciences ; Key Research Program of Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Ministry of Science and Technology of China ; Ministry of Science and Technology of China ; Ministry of Science and Technology of China ; Ministry of Science and Technology of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/95693]  
专题地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者Miao, Laicheng
作者单位1.Shahrood Univ Technol, Fac Earth Sci, Dept Petrol & Econ Geol, Shahrood, Iran
2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing, Peoples R China
3.Chinese Acad Sci, Inst Earth Sci, Beijing, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, 19 Beitucheng Western Rd, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Li, Xingbo,Miao, Laicheng,Zhang, Fochin,et al. Mashhad komatiitic rocks in NE Iran: Origin and implications for the evolution of the Paleo-Tethyan Ocean[J]. GEOLOGICAL JOURNAL,2019,54(6):3314-3334.
APA Li, Xingbo,Miao, Laicheng,Zhang, Fochin,Ghasemi, Habibollah,Zhu, Shuaiming,&Yang, Shunhu.(2019).Mashhad komatiitic rocks in NE Iran: Origin and implications for the evolution of the Paleo-Tethyan Ocean.GEOLOGICAL JOURNAL,54(6),3314-3334.
MLA Li, Xingbo,et al."Mashhad komatiitic rocks in NE Iran: Origin and implications for the evolution of the Paleo-Tethyan Ocean".GEOLOGICAL JOURNAL 54.6(2019):3314-3334.

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来源：地质与地球物理研究所

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