Gravimetric and geologic data show that the reactivation of the Neogene Interandean depression and/or the ~75 65 Ma ophiolite suture into the modern dynamic of the Andes controlled the Gulf of Guayaquil Tumbes basin (GGTB) location and evolution during the past 1.8 1.6 Myr at least. Depending on whether the remobilization occurred along the interandean depression or the ophiolite suture, the GG...

We suggest a new explanation for the presence of crustally derived zircons in the upper-mantle rocks of ophiolitic complexes, as an alternative to subduction-related models. Integrated isotopic (U-Pb, Hf, and O isotopes) and trace-element data for zircons from the Tumut ophiolitic complex (southeast Australia) indicate that these grains are related to granitic magmatism and were introduced into...

The Chenaillet Ophiolite is one of the best-preserved remnants of the Piemont-Liguria oceanic basin, a branch of the Central Atlantic that opened during the separation of Adria/Africa from Europe. Despite numerous studies of structure, petrology, geochemistry and isotope geochronology, the timing and genesis of various magmatic rocks within the Chenaillet Ophiolite are still controversial. We p...

Microbial abundance and diversity in deep subsurface environments is dependent upon the availability of energy and carbon. However, supplies of oxidants and reductants capable of sustaining life within mafic and ultramafic continental aquifers undergoing low-temperature water-rock reaction are relatively unknown. We conducted an extensive analysis of the geochemistry and microbial communities r...

Age delimitation integrated with aeromagnetometric and aerogammaspectrometric survey advances the understanding of ophiolite evolution in Brasiliano Orogen. We focused on Bossoroca ophiolite, because oceanic crustal mantle rocks contain zircon metasomatic chloritite. A metadiorite a metavolcanoclastic rock were also studied to delimit relationship between island-arc infrastructure superstructur...

the kahnuj ophiolitic complex, a part of the jazmurian ophiolitic belt, is located on the western boundary of the jazmurian depression and is bounded by two major fault systems. there is a well-preserved, ophiolite pseudostratigraphy of early cretaceous to early palaeocene age and has a bearing on the mesozoic development of southeastern part of iran and adjacent region. the kahnuj ophiolitic c...

Abstract Mantle peridotites from three 3 × 3-meter grids sampled at kilometer distances one another in the ca. 497 Ma Leka Ophiolite Complex (LOC), Norway, are examined to investigate chemical and isotopic nature of oceanic mantle domains centimeter scale. The lithology each grid locality is predominantly harzburgite, but includes layers lenses dunite pyroxenite. Major lithophile trace element ...