Hydrous phyllosilicate minerals, including the serpentine subgroup, are likely to be major constituents of material that will bought back Earth by missions Mars and primitive asteroids Ryugu Bennu. Small quantities (< 60 g) micrometre-sized, internally heterogeneous available for study, requiring minimally destructive techniques. Many conventional methods unsuitable phyllosilicates as they typi...

Voluminous flux of a hydrous component from subducting oceanic lithosphere into the forearc mantle and its contribution to arc magmas have long been recognised but transfer solid-phase materials has received less consideration. Although xenocrystic zircons are known some ophiolitic chromitites their origins remain enigmatic. How when such transferred overlying wedge length residency therein unc...

A long-standing problem in solid Earth science is to understand how low-angle normal faults form, their role the development of tectonic asymmetry conjugate margins, and they relate mantle hydration during continental breakup. The latter requires water reach through active brittle faults, but low angle slip on mechanically difficult. Here, we incorporate observations from high-resolution multic...

Serpentinites are central to water (re)cycling in subduction zones and thus effect fluid-mediated element transfer between the hydrosphere Earth's mantle back into continental crust via calcalkaline magmatism. Diverse often controversial models exist on relevance of various source contributions budget fluid mobile elements hydrous peridotites how these evolve during cycle. This work offers nove...

Natural or native molecular hydrogen (H2) can be a major component in natural gas, and yet its role the global energy sector’s usage as clean carrier is not normally considered. Here, we update scarce reporting of Australian gas with new compositional isotopic analyses H2 undertaken at Geoscience Australia. The dataset involves ~1000 samples from 470 wells both sedimentary non-sedimentary basin...

Ultramafic-mafic rocks from Makrirrakhi, Central Greece exhibit features of an original ophiolite sequence which contains depleted mantle material, ultramafic containing partial melt textures and possibly the marie "pluton" which resulted from the coalescing of these partial melt segregations. Considerable mineralogical variation exists: unzoned olivine crystals range in composition from FoTs_s...

The oxygen isotopic compositions of calcite grains in four CM carbonaceous chondrites have been determined by NanoSIMS, and results reveal that aqueous solutions evolved in a similar manner between parent body regions with different intensities of aqueous alteration. Two types of calcite were identified in Murchison, Mighei, Cold Bokkeveld and LaPaz Icefield 031166 by differences in their petro...

The Menez Gwen, Lucky Strike, Rainbow, TAG (Transatlantic Geotraverse) and Snake Pit hydrothermal vent fields on the Mid-Atlantic Ridge were revisited resampled for geochemical investigation during BIOBAZ 2013 BICOSE 2014 research cruises. Geochemical analysis of major minor elements fluid concentrations gases extends complements existing dataset. Our results are consistent with values previous...