| Title | Fracture logging of the AND-1B Core, McMurdo Ice Shelf Project, Antarctica |
| Author | Wilson, T.; Paulsen, T.; Läufer, A.L.; Millan, C. |
| Author Affil | Wilson, T., Ohio State University, School of Earth Sciences, Columbus, OH. Other: Northern Illinois University; University of Nebraska-Lincoln; University of Wisconsin-Oshkosh; Bundesanstalt für Geowissenschaften und Rohstoffe, Federal Republic of Germany |
| Source | Studies from the ANDRILL, McMurdo Ice Shelf Project, Antarctica; initial science report on AND-1B, edited by T.R. Naish, R. Powell and R. Levy. Terra Antartica, 14(3), p.175-184, . Publisher: Universita degli Studi di Siena, Sezione Scienze della Terra, Siena, Italy. ISSN: 1122- 8628 |
| Publication Date | 2007 |
| Notes | In English. 3 refs. GeoRef Acc. No: 284749 |
| Index Terms | Antarctica--McMurdo Ice Shelf; Southern Ocean--McMurdo Sound; Southern Ocean- -Victoria Land Basin; AND-1B Core; Antarctica; boreholes; breccia; cores; faults; fractures; McMurdo Ice Shelf; McMurdo Sound; Ross Ice Shelf; Ross Sea; sandstone dikes; sedimentary rocks; sedimentary structures; soft sediment deformation; Southern Ocean; spatial distribution; veins; Victoria Land Basin |
| Abstract | Over 4300 natural and induced fractures were logged in AND-1B drill core. Induced fractures include steeply dipping, petal, petal-centerline, and core-edge induced fractures (n=421) which reach a maximum density of 5 fractures/meter. Subhorizontal induced extension fractures are also abundant. Natural fractures (n=1485) occur in Miocene to Pleistocene age strata and include faults, brecciated zones, veins and sedimentary intrusions. Kinematic indicators document dominant normal faulting, although reverse faults are also present. Vein types include slickenfiber veins along faults, opening-mode fibrous veins, pressure shadows on clast margins, and complex microvein webs within fault zones. |
| Publication Type | journal article |
| Record ID | 84152 |