Lithosphere thickness controls continental basalt compositions: An illustration using Cenozoic basalts from eastern China

doi:10.1130/G46710.1

CORC > 海洋研究所 > 中国科学院海洋研究所 > 海洋地质与环境重点实验室

	Lithosphere thickness controls continental basalt compositions: An illustration using Cenozoic basalts from eastern China
	Guo, Pengyuan 1,4; Niu, Yaoling 1,2,3,4; Sun, Pu 1,4; Gong, Hongmei 1,4; Wang, Xiaohong 1,4
刊名	GEOLOGY
	2020-02-01
卷号	48 期号:2 页码:128-133
ISSN号	0091-7613
DOI	10.1130/G46710.1
通讯作者	Guo, Pengyuan(guopy@qdio.ac.cn)
英文摘要	Recent studies demonstrate that lithosphere thickness variation exerts the primary control on global seafloor basalt compositions. If the mechanism of such control, i.e., the lid effect, is indeed at work, lithosphere thickness variation must also influence basaltic compositions in continental settings. To test this hypothesis, we chose to study Cenozoic basalts in eastern continental China over a distance of similar to 260 km along a southeast-to-northwest traverse with a steep topographic gradient (similar to 500 to similar to 1500 nit above sea level) mirrored with a steep lithospheric thickness gradient (similar to 80 to similar to 120 km). The basalts erupted on the thinned lithosphere to the east are characterized by lower pressure (e.g., higher Si-72, lower Mg-72, Fe-72, and [Sm/Yb](N); subscript "72" refers to corresponding oxides corrected for fractionation effect to Mg# = 72; N-primitive mantle normalized) and higher extent (e.g., low Ti-72, P-72, K-72, Rb, Ba, Th, and ratios of more- to less-incompatible elements such as [La/Sm](N), Ba/Zr, and Zr/Yb) of melting than basalts erupted on the thickened lithosphere to the west. Importantly, these geochemical parameters all show significant correlations with both lithosphere thickness and topographic elevation. These first-order observations are a straightforward manifestation of the lid effect. Lithospheric contamination and mantle-source compositional variation can indeed contribute to the compositional variability of these continental basalts, but these latter effects are averaged out and are overshadowed by the lid effect. This finding emphasizes the importance of evaluating the lid effect before interpreting the petrogenesis of continental basalts and mantle dynamics. Our results also indicate that the continental surface elevation is isostatically balanced above a mantle depth that is deeper than the lithosphere-asthenosphere boundary.
资助项目	National Natural Science Foundation of China[41776067] ; National Natural Science Foundation of China[41630968] ; National Natural Science Foundation of China[91014003] ; 111 Project of China[B18048]
WOS研究方向	Geology
语种	英语
出版者	GEOLOGICAL SOC AMER, INC
WOS记录号	WOS:000509553300007
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/164478]
专题	海洋研究所_海洋地质与环境重点实验室
通讯作者	Guo, Pengyuan
作者单位	1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 2.China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China 3.Univ Durham, Dept Earth Sci, Durham DH1 3LE, England 4.Qingdao Natl Lab Marine Sci & Technol, Qingdao 266061, Peoples R China
推荐引用方式 GB/T 7714	Guo, Pengyuan,Niu, Yaoling,Sun, Pu,et al. Lithosphere thickness controls continental basalt compositions: An illustration using Cenozoic basalts from eastern China[J]. GEOLOGY,2020,48(2):128-133.
APA	Guo, Pengyuan,Niu, Yaoling,Sun, Pu,Gong, Hongmei,&Wang, Xiaohong.(2020).Lithosphere thickness controls continental basalt compositions: An illustration using Cenozoic basalts from eastern China.GEOLOGY,48(2),128-133.
MLA	Guo, Pengyuan,et al."Lithosphere thickness controls continental basalt compositions: An illustration using Cenozoic basalts from eastern China".GEOLOGY 48.2(2020):128-133.