Abstract Fluid flow in crystalline rocks the absence of fractures or ductile shear zones dominantly occurs by grain boundary diffusion, as it is faster than volume diffusion. It is, however, unclear how reactive fluid guided through such pathways. We present a microstructural, mineral chemical, and thermodynamic analysis static fluid-driven reaction from dry granulite to ‘wet’ eclogite. infiltr...

Abstract Triple oxygen isotope (δ17O and δ18O) values of high- low-temperature altered oceanic crust products basalt alteration experiments were measured to better constrain ocean compositions in deep time. The data define an array δ18O Δ′17O (Δ′17O=δ′17O − λRL × δ′18O + γ) from mantle toward 1‰ −0.01‰, respectively, with a λ ~0.523. used construct model for estimating δ18O-Δ′17O the ancient oc...

The very low water content of the granulitic unit of Holsnøy, in the Bergen Arcs, Norway, caused its partial metastable preservation throughout Caledonian burial end exhumation, leading to the observed mixture of completely eclogitized and uneclogitized rocks. Large-scale eclogite-facies fracturing enabled fluid penetration into the granulite and subsequent eclogitization, and resulted in a ver...

[1] Hole 1205A was drilled on Nintoku Seamount, which lies in the midportion of the Emperor Seamount Chain. This seamount was emergent 56 Myr ago but was submerged by 54 Ma, so the lavas have endured weathering in both subaerial and submarine environments. We have studied the petrology, mineralogy, and geochemistry of intercalated altered basalts, breccias, and soil samples recovered at Hole 12...

In Holsnøy (Bergen Arcs, Norway), metastable granulite facies anorthosite rocks are partially eclogitised within hydrous shear zones, that have been interpreted as widening over time with fluid influx and strain. We here present a detailed petrological description of two different metre-scale zones from this area. Within few tens centimetres each zone, the protolith (initially plagioclase + gar...

[1] Garnet pyroxenites are the most common deep lithospheric xenolith assemblages found in Miocene volcanic rocks that erupted through the central part of the Sierra Nevada batholith. Elemental concentrations and isotope ratios are used to argue that the Sierra Nevada granitoids and the pyroxenite xenoliths are the melts and the residues/cumulates, respectively, resulting from partial melting/f...

Four crustal xenoliths from Scotland have been dissected in order to evaluate the effects of magma-xenolith interaction on Rb-Sr and Sm-Nd isotopic systematics, and hence the use of the xenoliths for accurate determination of source compositions. Each xenolith was sampled from the edge to the center, The Nd isotopic compositions are virtually uniform across each xenolith; however, there are sig...