| 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
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| 2020-03-01 | |
| Source Publication | JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
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| ISSN | 2169-9313 |
| Volume | 125Issue:3Pages:17 |
| Corresponding Author | Sun, Pu(pu.sun@qdio.ac.cn) ; Niu, Yaoling(yaoling.niu@durham.ac.uk) |
| Abstract | Studies 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. |
| DOI | 10.1029/2019JB019315 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | NSFC-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 Area | Geochemistry & Geophysics |
| WOS Subject | Geochemistry & Geophysics |
| WOS ID | WOS:000530895800042 |
| Publisher | AMER GEOPHYSICAL UNION |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.qdio.ac.cn/handle/337002/167368 |
| Collection | 海洋地质与环境重点实验室 |
| Corresponding Author | Sun, Pu; Niu, Yaoling |
| Affiliation | 1.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 Affilication | Institute of Oceanology, Chinese Academy of Sciences |
| Corresponding Author Affilication | Institute 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. |
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