Abstract Bulk rock geochemistry and sensitive high-resolution ion microprobe zircon geochronology of igneous metaigneous rocks the Évora gneiss dome, located to north reworked Rheic Ocean suture zone in southwest Iberian Variscan belt, reveal a succession magmatic melting events lasting ~30 m.y. between ca. 341–314 Ma. The study detailed field relationships orthomigmatites (i.e., migmatites fro...

The zircon record of complex high-grade gneiss terrains is key to interpreting their tectonothermal evolution. Typically, such studies focus on zircon-rich, felsic rocks, which commonly have a complicated (partial melting, inheritance, partial dissolution, and reprecipitation) record. Here we show that metamorphosed mafic rocks retained melts (i.e. in situ leucosomes) provide the evolution crus...

As seismic data from the lower crust becomes more readily available, it is important to link properties ongoing processes within crustal evolution. This includes high temperature, pre- and post-migmatization solid state deformation as well melt-present deformation. We selected two tonalitic migmatites with variable former melt content (one metatexite one diatexite) Daqingshan area, northern Nor...

The Evje-Iveland pegmatite field in Norway contains pegmatites that are known for their rare scandium mineralization. petrogenesis of these has been debated the literature nearly a century. Hypotheses origin pegmatite-forming melt have included either anatexis host amphibolite vapor-absent conditions, wherein is scavenged from amphibolite; or magmatic differentiation, concentrated through proce...

The island of Syros consists largely of possibly-repeated sequences of glaucophane-bearing calcareous schists, mafic schists, dolomite marbles, and calcite marbles containing abundant aragonite pseudomorphs (Dixon, 1969; Hecht, 1984). Several discrete, fault-bounded packages of blueschist/eclogite-facies mafic rocks with minor serpentinite are also found on the island. Although the mafic rocks ...

Melting of mafic veins in a marble-cake mantle may play an important role in generating isotopic and chemical heterogeneities in mid-ocean ridge and ocean island basalts. Mafic veins have lower solidi than mantle peridotite and will be preferentially sampled during partial melting, particularly at low melt fractions. However, the abundance of mafic components in the mantle or their role during ...

Mafic enclaves from three plutons in the Chilliwack batholith have been compared with contemporaneous mafic stocks in order to determine (1) the processes by which mafic and felsic magmas hybridize in the plutonic environment and (2) whether analysis of early-formed enclave minerals, particularly apatite, can provide a means of seeing through hybridization effects and deciphering the original t...

[1] Definitive exposures of pristine, ancient crust on Mars are rare, and the finding that much of the ancient Noachian terrain on Mars exhibits evidence of phyllosilicate alteration adds further complexity. We have analyzed high-resolution data from the Mars Reconnaissance Orbiter in the well-exposed Noachian crust surrounding the Isidis basin.We focus on data from the Compact Reconnaissance I...

[1] The earliest formed crust on a single plate planet such as Mars should be preserved, deeply buried under subsequent surface materials. Mars’ extensive cratering history would have fractured and disrupted the upper layers of this ancient crust. Large impacts occurring late in Martian geologic history would have excavated and exposed this deeply buried material. We report the compositional an...