TY - JOUR
T1 - Origin of ocean island basalts in the West African passive margin without mantle plume involvement
AU - Belay, Iyasu Getachew
AU - Tanaka, Ryoji
AU - Kitagawa, Hiroshi
AU - Kobayashi, Katsura
AU - Nakamura, Eizo
N1 - Funding Information:
We thank F.T. Aka for suggesting the project, providing the samples, and discussions. We acknowledge X. Shen, C. Sakaguchi, I. Pineda-Velasco, and K. Tanaka for laboratory assistance; T. Ota, T. Kunihiro, G.E. Bebout, H. Cheng, C. Potiszil, and T.O. Rooney for helpful discussions; and S.Y. O’Reilly for providing the original figure file. Constructive review by G. Ito and anonymous reviewers are highly appreciated. I.G.B was supported by Japanese Government Scholarships and grants for MEXT Program for Education and Research; R.T. was supported by JSPS KAKENHI Grant Number 16K05578; and E.N. was supported by grants for JSPS Asia–Africa Science Platform Program.
Publisher Copyright:
© 2019, The Author(s).
PY - 2019/12/1
Y1 - 2019/12/1
N2 - The geochemical variabilities in intraplate basalts (IB) from the West African passive margin (WAPM) region, have generally been employed to indicate the presence of recycled materials in an associated upwelling mantle plume. However, the absence of time-progressive linear hotspot tracks in WAPM-IB make it difficult to explain their genesis solely by the mantle plume hypothesis. Here, we show that the Sr–Nd–Hf–Pb isotopic variations in basalts from most of the WAPM-IB could have mainly attributed to the derivation from two types of fusible regions of the refertilized subcontinental lithospheric mantle (SCLM) and the sub-lithospheric mantle. The locations and magma genesis of WAPM-IB are strongly related to the distance from the Mesozoic rift axis and the structure of the rifted SCLM. The melting of the source region can possibly be attributed to small-scale mantle convection at the base of the SCLM without the involvement of a mantle plume.
AB - The geochemical variabilities in intraplate basalts (IB) from the West African passive margin (WAPM) region, have generally been employed to indicate the presence of recycled materials in an associated upwelling mantle plume. However, the absence of time-progressive linear hotspot tracks in WAPM-IB make it difficult to explain their genesis solely by the mantle plume hypothesis. Here, we show that the Sr–Nd–Hf–Pb isotopic variations in basalts from most of the WAPM-IB could have mainly attributed to the derivation from two types of fusible regions of the refertilized subcontinental lithospheric mantle (SCLM) and the sub-lithospheric mantle. The locations and magma genesis of WAPM-IB are strongly related to the distance from the Mesozoic rift axis and the structure of the rifted SCLM. The melting of the source region can possibly be attributed to small-scale mantle convection at the base of the SCLM without the involvement of a mantle plume.
UR - http://www.scopus.com/inward/record.url?scp=85068793516&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85068793516&partnerID=8YFLogxK
U2 - 10.1038/s41467-019-10832-7
DO - 10.1038/s41467-019-10832-7
M3 - Article
C2 - 31289264
AN - SCOPUS:85068793516
SN - 2041-1723
VL - 10
JO - Nature Communications
JF - Nature Communications
IS - 1
M1 - 3022
ER -