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Iodp Expedition 340T: Borehole Logging at Atlantis Massif Oceanic Core Complex : Volume 15, Issue 15 (01/03/2013)

By Blackman, D.

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Book Id: WPLBN0004021561
Format Type: PDF Article :
File Size: Pages 5
Reproduction Date: 2015

Title: Iodp Expedition 340T: Borehole Logging at Atlantis Massif Oceanic Core Complex : Volume 15, Issue 15 (01/03/2013)  
Author: Blackman, D.
Volume: Vol. 15, Issue 15
Language: English
Subject: Science, Scientific, Drilling
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2013
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

APA MLA Chicago

Harding, A., Slagle, A., Guerin, G., Mccaig, A., & Blackman, D. (2013). Iodp Expedition 340T: Borehole Logging at Atlantis Massif Oceanic Core Complex : Volume 15, Issue 15 (01/03/2013). Retrieved from http://worldlibrary.net/


Description
Description: Scripps Institution of Oceanography, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA. Integrated Ocean Drilling Program (IODP) Expedition 340T returned to the 1.4-km-deep Hole U1309D at Atlantis Massif to carry out borehole logging including vertical seismic profiling (VSP). Seismic, resistivity, and temperature logs were obtained throughout the geologic section in the footwall of this oceanic core complex. Reliable downhole temperature measurements throughout and the first seismic coverage of the 800–1400 meters below seafloor (mbsf) portion of the section were obtained. Distinct changes in velocity, resistivity, and magnetic susceptibility characterize the boundaries of altered, olivine-rich troctolite intervals within the otherwise dominantly gabbroic se-quence. Some narrow fault zones also are associated with downhole resistivity or velocity excursions. Small deviations in temperature were measured in borehole fluid adjacent to known faults at 750 mbsf and 1100 mbsf. This suggests that flow of seawater remains active along these zones of faulting and rock alteration. Vertical seismic profile station coverage at zero offset now extends the full length of the hole, including the uppermost 150 mbsf, where detachment processes are expected to have left their strongest imprint. Analysis of wallrock properties, together with alteration and structural characteristics of the cores from Site U1309, highlights the likely interplay between lithology, structure, lithospheric hydration, and core complex evolution.

doi:10.2204/iodp.sd.15.04.2013


Summary
IODP Expedition 340T: Borehole Logging at Atlantis Massif Oceanic Core Complex

 

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