IOCAS-IR  > 海洋地质与环境重点实验室
The Lithospheric Thickness Control on the Compositional Variation of Continental Intraplate Basalts: A Demonstration Using the Cenozoic Basalts and Clinopyroxene Megacrysts From Eastern China
Sun, Pu1,2; Niu, Yaoling2,3,4; Guo, Pengyuan1,2; Duan, Meng1,2; Wang, Xiaohong1,2; Gong, Hongmei1,2; Xiao, Yuanyuan1,2
2020-03-01
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
ISSN2169-9313
Volume125Issue:3Pages:17
Corresponding AuthorSun, Pu(pu.sun@qdio.ac.cn) ; Niu, Yaoling(yaoling.niu@durham.ac.uk)
AbstractStudies on intraplate ocean island basalts have demonstrated the control of lithosphere thickness on the extent of melting and pressure of melt extraction (i.e., the lid effect). However, whether lithosphere thickness also controls the composition of within-continent basalts remains unclear. Here, we test this hypothesis by studying the Cenozoic basalts contaitning clinopyroxene megacrysts from 10 localities throughout eastern continental China with a north-south spatial coverage in excess of 2,500 km. Indeed, the geochemical parameters (e.g., abundances and ratios of major and trace elements) correlate well with the depth of the lithosphere-asthenosphere boundary (LAB) calculated using the clinopyroxene barometry, showing significant lithospheric thickness control on basalt compositions. These observations offer further evidence for melt pooling (a melt rich layer) close beneath the LAB as a "stable magma reservoir" for crystallizing compositionally uniform clinopyroxene megacrysts to be carried by subsequent pulses of melt transport and eruption. Plain Language Summary Magmas erupted on the surface of Earth have different compositions. These compositional variations may result from mantle source compositional variations, varying extent and pressure of melting as well as magma evolution during ascent. Studies have observed significant control of oceanic lithospheric thickness on the compositional variation of oceanic basalts. Magmas erupted on thick lithosphere have geochemical signatures of high pressure and low extent of melting, whereas magmas erupted on thin lithosphere have signatures of low pressure and high extent of melting. However, whether continental lithospheric thickness has similar compositional control on the within-continent basalts remains unclear, largely because the continental lithosphere thickness at the time of volcanism is unknown. In this study, we test this hypothesis by studying the Cenozoic basalts containing clinopyroxene megacrysts from 10 localities throughout eastern continental China with a north-south spatial coverage in excess of 2,500 km. These clinopyroxene megacrysts were explained as high-pressure cumulates from basaltic magmas at sites close to the base of the lithosphere, and their equilibrium pressures (depths) calculated using the clinopyroxene geobarometer are thus ideal proxies for the lithosphere thickness at the time of eruptions. This study demonstrated significant control of continental lithospheric thickness on the compositional variation of within-continent magmas.
DOI10.1029/2019JB019315
Indexed BySCI
Language英语
Funding ProjectNSFC-Shandong Joint Fund for Marine Science Research Centers[U1606401] ; National Natural Science Foundation of China (NSFC)[41630968] ; National Natural Science Foundation of China (NSFC)[41776067] ; National Natural Science Foundation of China (NSFC)[41130314] ; National Natural Science Foundation of China (NSFC)[91014003] ; Chinese Academy of Sciences[Y42217101L] ; Qingdao National Laboratory for Marine Science and Technology[2015ASKJ03] ; 111 Project[B18048]
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000530895800042
PublisherAMER GEOPHYSICAL UNION
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/167368
Collection海洋地质与环境重点实验室
Corresponding AuthorSun, Pu; Niu, Yaoling
Affiliation1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao, Peoples R China
2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao, Peoples R China
3.Univ Durham, Dept Earth Sci, Durham, England
4.China Univ Geosci, Sch Earth Sci & Resources, Beijing, Peoples R China
First Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Corresponding Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Sun, Pu,Niu, Yaoling,Guo, Pengyuan,et al. The Lithospheric Thickness Control on the Compositional Variation of Continental Intraplate Basalts: A Demonstration Using the Cenozoic Basalts and Clinopyroxene Megacrysts From Eastern China[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2020,125(3):17.
APA Sun, Pu.,Niu, Yaoling.,Guo, Pengyuan.,Duan, Meng.,Wang, Xiaohong.,...&Xiao, Yuanyuan.(2020).The Lithospheric Thickness Control on the Compositional Variation of Continental Intraplate Basalts: A Demonstration Using the Cenozoic Basalts and Clinopyroxene Megacrysts From Eastern China.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,125(3),17.
MLA Sun, Pu,et al."The Lithospheric Thickness Control on the Compositional Variation of Continental Intraplate Basalts: A Demonstration Using the Cenozoic Basalts and Clinopyroxene Megacrysts From Eastern China".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 125.3(2020):17.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Sun, Pu]'s Articles
[Niu, Yaoling]'s Articles
[Guo, Pengyuan]'s Articles
Baidu academic
Similar articles in Baidu academic
[Sun, Pu]'s Articles
[Niu, Yaoling]'s Articles
[Guo, Pengyuan]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Sun, Pu]'s Articles
[Niu, Yaoling]'s Articles
[Guo, Pengyuan]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.