Can I read Prospective pyroxenite–peridotite mixed mantle source for the northern Carlsberg Ridge on EtoBox?

Prospective pyroxenite–peridotite mixed mantle source for the northern Carlsberg Ridge by Hang Hu; Xing Yu; Xiqiu Han; Yejian Wang; Zhongyan Qiu; Tong Zong; Jiqiang Liu; Honglin Li; Xucheng Xu is a Earth and Planetary Sciences article available to read on EtoBox.

What is Prospective pyroxenite–peridotite mixed mantle source for the northern Carlsberg Ridge about?

The geochemical heterogeneity of the mantle source beneath the mid-ocean ridge has been well studied, while the lithologic variability within the source has yet been rarely mentioned. We report new major, trace elements, and Sr-Nd-Pb isotopic data of fresh mid-ocean ridge basalts from the northern part of Carlsberg Ridge (i.e., CR Seg-1). The geological and geophysical observations, such as the lesser spreading rate, greater axial depth, and higher mantle Bouguer anomaly of the Seg-1, all indicate magma deficiency and lower melting degree, whereas the segment's lower average Na8 and higher Ca8/Al8 indicate a higher apparent melting degree. These contradictions cannot be reconciled by melting the lithologically homogeneous peridotite mantle. We proposed that fusible pyroxenite components in the Seg-1 source melt preferentially and generate lower Na8 magma. Moreover, it cools the ascending mantle and decreases the supply of melt derived from peridotite, leading to a magma shortage in the segment. The garnet signature revealed by the rare earth elements, higher Zn/Fe and Fe/Mn ratios, and source enrichment evidenced by Sr-Nd-Pb isotopes, support the presence of a trace quantity of gar

Who reads Prospective pyroxenite–peridotite mixed mantle source for the northern Carlsberg Ridge?

Author

Hang Hu; Xing Yu; Xiqiu Han; Yejian Wang; Zhongyan Qiu; Tong Zong; Jiqiang Liu; Honglin Li; Xucheng Xu

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)