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• W2013506711 abstract "Physical properties of gabbroic samples from Ocean Drilling Program Hole 1105A were measured in the laboratory, with a particular emphasis on the analysis of electrical properties. This data-set includes the major lithologies sampled in ODP Hole 1105A: gabbros, olivine gabbros, oxide-rich gabbros, and, for all rock types, different ranges of alteration were sampled: from flesh to highly altered. All these lithologies correspond to the seismic Layer 3 layer of the oceanic crust, and large-scale geophysical data interpretation requires a complete understanding of the physical properties of rocks in this section. Electrical conductivities measured on brine-saturated gabbros reveal strong excess conductivity for samples rich in oxide minerals and, to a lesser extent, for altered samples. However, the classical models do not explain the excess conductivity reported in the oxide-rich samples when saturated with brine. The electrical conduction via electronic processes in metallic minerals has been taken into account in our analysis of the electrical properties. The oxide minerals' contribution has been independently estimated through measuring dry electrical resistivity. These measurements allowed quantification of the electronic conduction, which can reach 80% of the full conductivity for the most oxide-rich gabbros. Through the last three decades, the Deep Sea Drilling Project (DSDP) and Ocean Drilling Program (ODP) have provided a unique opportunity to study the composition and structure of the oceanic crust. Our knowledge of the in situ structure of lower oceanic crust has largely been based on geophysical and ophiolite studies. Deep drilling investigations of lower oceanic crust have been achieved in several locations, taking advantage of tectonic exposure, e.g. Hess Deep (ODP Leg 147; Mdvel et al. 1996), the Mid-Atlantic Ridge (ODP Leg 153 at Mark Area; Karson et al. 1997) and the SW Indian Ridge (ODP Legs 118, 176 and 179; Von Herzen et al. 1991; Dick et al. 1999; Pettigrew et al. 1999). Boreholes drilled on the SW Indian Ridge have allowed study of lowercrustal rocks analogous to ophiolitic sequences, and assessment of the seismic nature of oceanic Layer 3. The analysis of geophysical data requires a complete understanding of the physical properties of the investigated section. For this purpose, laboratory measurements of the physical properties of oceanic samples provide direct insights into the physical structure of the oceanic crust. These measurements can be compared with in situ down-hole measurements. In this paper, we present a petrophysical study of gabbroic samples from ODP Hole I I05A, located 1.5 km from the reference ODP Site 735. The physical properties are investigated at room pressure and temperature in order to characterize the penetrated massif, as well as to determine the influence of alteration due to fluid circulation on rock properties. Porosity, density, electrical properties (formation factor, surface conductivity), bulk magnetic susceptibility and compressional velocity From: HARVEY, P. K., BREWER, T. S., PEZARD, P. A. & PETROV, V. A. (eds) 2005. Petrophysical Properties of Crystalline Rocks. Geological Society, London, Special Publications, 240, 179-193. 0305-8719/05/$15.00 © The Geological Society of London 2005. 180 F. EINAUDI ET AL. have been measured on a set of 34 samples collected during ODP Leg 179. Electlical properties of gabbros have been investigated in detail by Pezard et al. (1991) and lldefonse & Pezard (2001) in ODP Hole 735B, to identify downhole changes in electrical properties, porosity structure and alteration. An important result is a change in porosity as a function of depth. These works also highlighted the importance of oxide minerals in the measured electrical resistivity. In the oxide-mineral-rich samples, it was pointed out from saturated measurements that oxide ionic conductivity was involved. Unfortunately, the 735B mini-cores were lost, and further investigation of complementary measurements such as oxide content, magnetic susceptibility and dry resistivity were not possible. Our data-set, however, does allow a full investigation of the petrophysical properties in such oxide-rich gabbros. Due to extreme sensitivity, and in spite of complexity, electrical methods are among the most precise indirect tools for the analysis of rock structures. At low frequencies (< 1 kHz), electrical properties of saturated rocks are influenced by the nature of the rock matrix; the chemical composition and salinity of the saturating fluid; the cation-exchange processes along pore surfaces, and/or the movement of fluids in the porous medium (e.g. Waxman & Smits 1968; Olhoeft 1981; Walsh & Brace 1984; Katsube & Hume 1987; Pezard 1990; Pezard et al. 1991; Revil et al. 1998). Rock-forming minerals are mostly silicates, having a high resistivity (106 to 1014 ohm m), but, when the rock matrix contains conductive minerals (Ti -Fe oxide in gabbros), the conduction current through the matrix may be appreciable as oxides reach a resistivity of 10 -6 ohm m (Olhoeft 1981; Gu6guen & Palciauskas 1992). The influence of the oxide minerals on the various physical properties are investigated in this paper. Geological setting: the Atlantis II Bank ODP Hole 1105A is located on top of the shallow Atlantis Bank (720 m below sea-level), about 18 km east of the active Atlantis transform fault and 93 km south of the present-day ridge axis (Fig. 1). The Atlantis Bank is the shallowest and largest (c. 35 km 2) of a series of north-south aligned fiat-topped platforms (Dick et al. 1999). This shallow structure is interpreted as the result of progressive unroofing along a northdipping low-angle detachment fault (Karson & Dick 1984; Cannat et al. 1991; Dick et al. 1991), in a tectonic situation similar to that of the inside-corner highs of the Mid-Atlantic Ridge (Tucholke & Lin 1994; Cann et al. 1997; Tucholke et al. 1998; Ranero & Reston 1999). The SW Indian Ridge (SWIR) is one of the slowest spreading sections of the mid-ocean ridge system, with a full spreading rate of 16 m m / a (Fisher & Sclater 1983; Dick et al. 1991). Slow-spreading ridges are characterized" @default.
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• W2013506711 title "Electrical properties of slow-spreading ridge gabbros from ODP Hole 1105A, SW Indian Ridge" @default.
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