Inferences about magma sources and mantle structure from variations of  143 Nd/ 144 Nd | Zendy

DePaolo D. J. | Zendy; Wasserburg G. J. | Zendy

AI Assistant Blog Pricing

Home ZAIA Blog

Premium

Inferences about magma sources and mantle structure from variations of 143 Nd/ 144 Nd

Author(s) -

DePaolo D. J.,

Wasserburg G. J.

Publication year - 1976

Publication title -

geophysical research letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.007

H-Index - 273

eISSN - 1944-8007

pISSN - 0094-8276

DOI - 10.1029/gl003i012p00743

Subject(s) - igneous rock , geology , basalt , flood basalt , geochemistry , mantle (geology) , fractional crystallization (geology) , large igneous province , mantle plume , continental crust , magmatism , paleontology , lithosphere , tectonics , volcanism

Continental flood basalts and mid‐ocean ridge (MOR) tholeiitic basalts have distinctly different 143 Nd/ 144 Nd which may permit a priori distinction between "continental" and "oceanic" igneous rocks. Initial 143 Nd/ 144 Nd of continental igneous rocks through time fall on a Sm/Nd evolution curve with chondritic REE abundance ratio. These observations indicate that many continental igneous rocks are derived from a reservoir with chondritic REE pattern which may represent primary material remaining since the formation of the earth. Oceanic igneous rocks are derived from a different ancient reservoir which has Sm/Nd higher than chondritic. Initial 143 Nd/ 144 Nd and 87 Sr/ 86 Sr in young basalts from both oceans and continents show a strong correlation suggesting that Sm‐Nd and Rb‐Sr fractionation events in the mantle may be correlative and caused by the same process. From this correlation Rb/Sr for the earth is inferred to be 0.029.

This content is not available in your region!

Continue researching here.

Having issues? You can contact us here

Accelerating Research