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Heterogeneous Fossil Reunion Plume Component in the Source Region of Enriched MORB Along the Central Indian Ridge Between 12° and 17°S

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Title
Heterogeneous Fossil Reunion Plume Component in the Source Region of Enriched MORB Along the Central Indian Ridge Between 12° and 17°S
Other Titles
중앙 인도양 해령(12° and 17°S) EMORB 현무암의 Reunion 맨틀 플룸 조성 규명
Authors
Clement Vincent
박정우
이상묵
김종욱
Lee, Mi Jung
Sidonie Revillon
Keywords
MORB (E-MORB) from the Central Indian Ridge (12°?17°S)Reunion Plume (RP)Sr-Nd-Pb isotope
Issue Date
2022
Citation
Clement Vincent, et al. 2022. "Heterogeneous Fossil Reunion Plume Component in the Source Region of Enriched MORB Along the Central Indian Ridge Between 12° and 17°S". JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, 127(12): 1-20.
Abstract
Mid-ocean ridge basalts (MORB) from the Central Indian Ridge (CIR) between 12° and 17°S show a wide range of geochemical and isotopic variations. Particularly, MORB from a segment between 14° and 15°S are more enriched in incompatible trace elements with more radiogenic Sr and Pb isotope and unradiogenic Nd isotope values than the lavas between 15° and 16°S with geochemical features of normal MORB. However, the causes for the enrichment between 14° and 15°S are poorly constrained. In this study, we re-examined the CIR MORB from 12° to 17°S with new geochemical data obtained based on high spatial resolution sampling to better understand the nature of the enriched mantle source. Our new geochemical data show that the MORB between 14° and 15°S, with maximum values for (La/Sm)N = 1.95, 87Sr/86Sr = 0.703526 and 206Pb/204Pb = 18-7558, are more enriched than those from the southern segments (16° to 20°S) known to be influenced by the Reunion mantle component. The new trace element and isotopic compositions of MORB suggest that three mantle end-members are required to explain the geochemical variations shown between 14° and 16°S: the depleted Indian-type MORB mantle, Reunion Plume (RP), and Seychelles/Madagascar-like continental crust components. Moreover, our mixing model suggests that the differences in enriched MORB signature from 14° to 20°S are due to variable proportions of continental material previously mixed with the RP. Our study implies that a continental component interacted with the plume into the asthenosphere, possibly beneath Madagascar or below Mauritius Island and the Mascarene plateau.
URI
https://repository.kopri.re.kr/handle/201206/14223
DOI
http://dx.doi.org/10.1029/2022JB025379
Type
Article
Station
기타()
Indexed
SCIE
Appears in Collections  
2022-2022, Mantle dynamics and tectonic evolutions of Zealandia-Antarctic domain (22-22) / Park, Sung Hyun (PE22050)
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