Geophysics and geochemistry of seafloor brines

Collision and Extension in the Alpine - Carpathian - Pannonian System A 2-day workshop on the geodynamic evolution of the Alpine – Carpathian orogens and the Pannonian basin, encompassing geophysics geochemistry and geology

A 2-day workshop on the geodynamic evolution of the Alpine – Carpathian orogens and the Pannonian basin, encompassing geophysics geochemistry and geology

Hydrothermal recharge and discharge guided by basement outcrops on 0.7–3.6 Ma seafloor east of the Juan de Fuca Ridge: Observations and numerical models

[1] The nature of ridge-flank hydrothermal circulation guided by basement outcrops protruding through thick sediments is constrained on the eastern flank of the Juan de Fuca Ridge using combined bathymetric, seismic, and thermal observations and analytical and numerical calculations of coupled fluid-heat flow. Observational data near the western edge of the survey area indicate that young, cool...

Foundations of Geophysics and Geochemistry

Constraints on the anisotropic contributions to velocity discontinuities at ∼60 km depth beneath the Pacific

Strong, sharp, negative seismic discontinuities, velocity decreases with depth, are observed beneath the Pacific seafloor at ∼60 km depth. It has been suggested that these are caused by an increase in radial anisotropy with depth, which occurs in global surface wave models. Here we test this hypothesis in two ways. We evaluate whether an increase in surface wave radial anisotropy with depth is ...

Protracted Construction of Gabbroic Crust At a Slow Spreading Ridge: Constraints from (206)Pb/(238)U Zircon Ages from Atlantis Massif and Iodp Hole U1309D (30 Degrees N, Mar)

T41D-1336.Karson, J. A. (1990), Seafloor spreading on the Mid-AtlanticRidge: Implications for the structure of ophiolites and ocea-nic lithosphere produced in slow-spreading environments, in Ophiolites and Oceanic Crustal Analogues: Proceedings of the Symposium ‘‘Troodos 1987’’, edited by J. Malpas et al.,pp. 125–130, Geol. Surv. Dep., Nicosia, Cyprus.Karson, J. A., G. L. Fr...