Fig. 6: Core observations and associated sketches showing the evolution of the microstructure and mineral composition from high to low temperature conditions.
From: Heterogeneous Earth’s mantle drilled at an embryonic ocean
a Photograph of core U1614C-22R-1A (interval 135/150 cm). b Mantle fabric is usually at a high angle to the core reference frame (> 40°) and here consists in a weak deformation subparallel to pyroxene-rich veins (1). A mafic intrusion (2, in blue) cuts this mantle fabric at a high angle. c Two generations of centimeter-scale serpentine veins (3, in pale green) follow pre-existing lithological contrasts or cut the magmatic vein-peridotite contacts. d Carbonate veins dissect the pre-existing features, overprinting both the initial mantle fabric and the serpentine vein network (4, in yellow).
