TY  - GEN
A1  - Gholamrezaie, Ershad
A1  - Scheck-Wenderoth, Magdalena
A1  - Sippel, Judith
A1  - Strecker, Manfred
T1  - Variability of the geothermal gradient across two differently aged magma-rich continental rifted margins of the Atlantic Ocean
T2  - Postprints der Universität Potsadm : Mathematisch-Naturwissenschaftliche Reihe
N2  - The  aim  of  this  study  is  to  investigate  the  shal-
low  thermal  field  differences  for  two  differently  aged  pas-
sive continental margins by analyzing regional variations in
geothermal gradient and exploring the controlling factors for
these  variations.  Hence,  we  analyzed  two  previously  pub-
lished 3-D conductive and lithospheric-scale thermal models
of  the  Southwest  African  and  the  Norwegian  passive  mar-
gins.  These  3-D  models  differentiate  various  sedimentary,
crustal,  and  mantle  units  and  integrate  different  geophysi-
cal data such as seismic observations and the gravity field.
We  extracted  the  temperature–depth  distributions  in  1 km
intervals  down  to  6 km  below  the  upper  thermal  boundary
condition. The geothermal gradient was then calculated for
these intervals between the upper thermal boundary condi-
tion and the respective depth levels (1, 2, 3, 4, 5, and 6 km
below the upper thermal boundary condition). According to
our results, the geothermal gradient decreases with increas-
ing  depth  and  shows  varying  lateral  trends  and  values  for
these two different margins. We compare the 3-D geologi-
cal structural models and the geothermal gradient variations
for both thermal models and show how radiogenic heat pro-
duction, sediment insulating effect, and thermal lithosphere–
asthenosphere boundary (LAB) depth influence the shallow
thermal field pattern. The results indicate an ongoing process
of oceanic mantle cooling at the young Norwegian margin
compared with the old SW African passive margin that seems
to be thermally equilibrated in the present day.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 621 
Y1  - 2019
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/41821
UR  - https://nbn-resolving.org/urn:nbn:de:kobv:517-opus4-418210
SN  - 1866-8372
IS  - 621
ER  -