Serpentinite: Record of Tectonic and Petrologic History

Tectonic and petrologic evolution of the Kodiak batholith and the trenchward belt, Kodiak Island, AK: Contact fault juxtaposition?

[1] Two fore‐arc magmatic belts exist in Kodiak Island, the granitic Kodiak batholith and the basaltic trenchward belt. Both are part of the 2100 km long Sanak‐Baranof belt, interpreted to result from trench‐ridge‐trench (T‐R‐T) triple‐junction migration. In this hypothesis, trenchward belt basaltic rocks formed as the spreading ridge first entered the accretionary prism, and the larger Kodiak ...

Mantle structure and tectonic history of SE Asia

Record of archaeal activity at the serpentinite-hosted Lost City Hydrothermal Field.

Samples of young, outer surfaces of brucite-carbonate deposits from the ultramafic-hosted Lost City hydrothermal field were analyzed for DNA and lipid biomarker distributions and for carbon and hydrogen stable isotope compositions of the lipids. Methane-cycling archaeal communities, notably the Lost City Methanosarcinales (LCMS) phylotype, are specifically addressed. Lost City is unlike all oth...

History of Writing and Record Keeping

The ultimate cause of much historical, social and cultural change is the gradual accumulation of human knowledge of the environment. Human beings use the materials in their environment to meet their needs and increased human knowledge of the environment enables human needs to be met in a more efficient manner. The human environment includes the human being itself and the human ability to commun...

Unraveling Europa’s Tectonic History: Evidence for a finite obliquity?

Introduction: Cycloidal crack patterns on Europa are influenced by tidal stress [1]. A wellrecognized portion of the tidal stress is associated with Europa’s orbital eccentricity, which in turn is driven by the Laplace orbital resonance. Their shapes record the location of their formation, as well as the conditions for crack formation. Hoppa et al. modeled several cycloid chains [2]. Hurford et...