Volcanic stratigraphy of DSDP/ODP Hole 395A: An interpretation using well-logging data |
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| Authors: | Bartetzko Anne Pezard Philippe Goldberg David Sun Yue-Feng Becker Keir |
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| Institution: | (1) Applied Geophysics, RWTH Aachen, Lochnerstr. 4-20, 52056 Aachen, Germany;(2) Laboratoire de Tectonophysique du CNRS, ISTEEM -, Université de Montpellier, 2 cc 49 - Place Eugene Bataillon, 34095 Montpellier cedex 5 -, France;(3) Lamont Doherty Earth Observatory, Columbia University, Borehole Research Group, P.O. Box 1000, 61 Route 9W, Palisades, NY 10964, USA;(4) Rosenstiel School of Marine and Atmospheric Science, University of Miami, Division of Marine Geology and Geophysics, 4600 Rickenbacker Causeway, Miami, FL 33149, USA |
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| Abstract: | Deep Sea Drilling Project/Ocean Drilling Program Hole 395A was drilled approximately 500 m deep into young oceanic crust west
of the Mid-Atlantic Ridge. Core recovery is very poor in this hole and therefore continuous downhole measurements are important
to understand the drilled lithology. Geophysical downhole measurements were carried out during several cruises. A new set
of logs was recorded during Leg 174B in summer 1997. The new logging data show a significant improvement in data quality compared
to older measurements from Leg 109. The lithostratigraphy established from cores gives only limited information because of
the poor core recovery in this hole. The gaps in the core lithostratigraphy are filled by reconstructing a synthetic lithological
profile using the standard well-logging data. Three types of lava morphologies, massive basalts, altered lava flows, and pillow
basalts, may be distinguished using the logs because the lava morphologies show differences in their physical properties due
to differences in fracturing and alteration. The synthetic lithological profile gives a more detailed and precise vertical
definition of single layers than the core profile. The integration of further logging and core data enables a detailed reconstruction
of the accretion history at the drill site. Cyclic, upward decreasing trends in the resistivity logs were already observed
during earlier cruises and were referred to magmatic cycles. Similar trends occur in the density log and, inversely, in the
total gamma ray log. The trends reflect gradual changes in fracturing, porosity, permeability, and alteration and cover depth
intervals of several tens of meters. Boundaries between cycles are interpreted to correspond to periods of volcanic quiescence.
Two types of boundaries may be identified. Boundaries correlating with reversals in the magnetic field and/or changes in the
geochemical composition of the basalts are interpreted as long pauses. Basalts separated by these boundaries were probably
fed by separate magma reservoirs. Boundaries identified only by changes in alteration but not in geochemistry are interpreted
to represent shorter pauses. They separate basalts that were probably fed by the same magma chamber.
This revised version was published online in November 2006 with corrections to the Cover Date. |
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| Keywords: | crustal accretion eruption cycles Ocean Drilling Program oceanic basalts wireline logging |
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