scholarly journals Preliminary results are in from mid-ocean ridge three-dimensional seismic reflection survey

Eos ◽  
1999 ◽  
Vol 80 (16) ◽  
pp. 181 ◽  
Author(s):  
S. C. Singh ◽  
M. C. Sinha ◽  
A. J. Harding ◽  
G. M. Kent ◽  
P. J. Barton ◽  
...  
Keyword(s):  
Seismic Reflection ◽  
Three Dimensional ◽  
Preliminary Results ◽  
Mid Ocean Ridge ◽  
Ocean Ridge

Evidence from three-dimensional seismic reflectivity images for enhanced melt supply beneath mid-ocean -ridge discontinuities

Nature ◽  
2000 ◽  
Vol 406 (6796) ◽  
pp. 614-618 ◽  
Author(s):  
G. M. Kent ◽  
S. C. Singh ◽  
A. J. Harding ◽  
M. C. Sinha ◽  
J. A. Orcutt ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Mid Ocean Ridge ◽  
Seismic Reflectivity ◽  
Ocean Ridge

scholarly journals Investigating influences on the Pb pseudo-isochron using three-dimensional mantle convection models with a continental reservoir

2021 ◽  
Author(s):  
James Panton ◽  
J. Davies ◽  
Tim Elliott ◽  
Morten Andersen ◽  
Donald Porcelli ◽  
...  
Keyword(s):  
Mantle Convection ◽  
Plate Tectonics ◽  
Three Dimensional ◽  
Isotope Ratios ◽  
Pb Isotope ◽  
Ocean Island Basalts ◽  
Mid Ocean Ridge ◽  
Subducted Oceanic Crust ◽  
Ocean Ridge ◽  
Relative Change

For mid-ocean ridge basalts (MORBs) and ocean island basalts (OIBs), measurements of Pb isotope ratios show broad linear correlations with a certain degree of scatter. In 207Pb/204Pb - 206Pb/204Pb space, the best fit line defines a pseudo-isochron age (τPb) of ~1.9 Gyr.Previous modelling suggests a relative change in the behaviours of U and Pb between 2.25-2.5 Ga, resulting in net recycling of HIMU (high U/Pb) material in the latter part of Earth's history, to explain the observed τPb. However, simulations in which fractionation is controlled by a single set of partition coefficients throughout the model runs fail to reproduce τPb and the observed scatter in Pb isotope ratios. We build on these models with 3D mantle convection simulations including parameterisations for melting, U recycling from the continents and preferential removal of Pb from subducted oceanic crust.We find that both U recycling after the great oxygenation event (GOE) and Pb extraction after the onset of plate tectonics, are required in order to fit the observed gradient and scatter of both the 207Pb/204Pb - 206Pb/204Pb and 208Pb/204Pb - 206Pb/204Pb arrays. Unlike much previous work, our model does not require accumulations of subducted oceanic crust to persist at the CMB for long periods of time in order to match geochemical observations.

PETROGENESIS OF GABBRO FROM ARCTIC GAKKEL MID-OCEAN RIDGE

2019 ◽  
Author(s):  
Yung Ping Lee ◽  
◽  
Jonathan E. Snow ◽  
Yongjun Gao
Keyword(s):  
Mid Ocean Ridge ◽  
Ocean Ridge
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