Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 243.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 243.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Warning: imagejpeg(C:\Inetpub\vhosts\kidney.de\httpdocs\phplern\28500352
.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Sci+Rep
2017 ; 7
(1
): 1870
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Whole-mantle convection with tectonic plates preserves long-term global patterns
of upper mantle geochemistry
#MMPMID28500352
Barry TL
; Davies JH
; Wolstencroft M
; Millar IL
; Zhao Z
; Jian P
; Safonova I
; Price M
Sci Rep
2017[May]; 7
(1
): 1870
PMID28500352
show ga
The evolution of the planetary interior during plate tectonics is controlled by
slow convection within the mantle. Global-scale geochemical differences across
the upper mantle are known, but how they are preserved during convection has not
been adequately explained. We demonstrate that the geographic patterns of
chemical variations around the Earth's mantle endure as a direct result of
whole-mantle convection within largely isolated cells defined by subducting
plates. New 3D spherical numerical models embedded with the latest geological
paleo-tectonic reconstructions and ground-truthed with new Hf-Nd isotope data,
suggest that uppermost mantle at one location (e.g. under Indian Ocean)
circulates down to the core-mantle boundary (CMB), but returns within ?100?Myrs
via large-scale convection to its approximate starting location. Modelled tracers
pool at the CMB but do not disperse ubiquitously around it. Similarly, mantle
beneath the Pacific does not spread to surrounding regions of the planet. The
models fit global patterns of isotope data and may explain features such as the
DUPAL anomaly and long-standing differences between Indian and Pacific Ocean
crust. Indeed, the geochemical data suggests this mode of convection could have
influenced the evolution of mantle composition since 550?Ma and potentially since
the onset of plate tectonics.