Geophysical characterization of bottom simulating reflectors in the Fairway Basin (off New Caledonia, Southwest Pacific), based on high resolution seismic profiles and heat flow data

Type Article
Date 2009-10
Language English
Author(s) Nouze Herve1, Cosquer Emmanuel1, Collot Julien1, 2, Foucher Jean-Paul1, Klingelhoefer FraukeORCID1, Lafoy Yves2, Geli LouisORCID1
Affiliation(s) 1 : IFREMER, Dept Marine Geosci, F-29280 Plouzane, France.
2 : Geol Survey New Caledonia, Dept Ind Mines & Energy New Caledonia, Noumea 98845, New Caledonia.
Source Marine Geology (0025-3227) (Elsevier), 2009-10 , Vol. 266 , N. 1-4 , P. 80-90
DOI 10.1016/j.margeo.2009.07.014
WOS© Times Cited 15
Keyword(s) Stratigraphy, Gas hydrates, Geophysics, Southwest Pacific, Fairway Basin, BSR
Abstract High-resolution reflection and refraction seismic data were collected in 2004 to investigate, in further detail than allowed by pre-existing low resolution seismic data, the nature of a Bottom Simulating Reflector (BSR) that extends over a broad area of the Fairway Basin, a rifted, continental structure located on the eastern flank of the Lord Howe Rise, to the southwest of New Caledonia. Two main reflectors are documented: the shallower (RN) mimics the seafloor and has a negative polarity while the deeper (RP) does not always mimic the seafloor and has a positive polarity. Using the existing regional seismic lines, we can show that reflector RN can be continuously followed up to DSDP 208 drill hole site. Reflector RP is discontinuous and cannot be traced to DSDP 208. Based on DSDP 208 stratigraphic data, Reflector RN is assigned to the Eocene/Oligocene regional unconformity; reflector RP is interpreted in terms of a diagenetic BSR, likely related to an Opal-A/Opal-CT transition front. Heat flow data collected in 2006 suggest that reflector RP lies too deep to be related to methane hydrates, strengthening our interpretation that RP is of diagenetic origin.
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Nouze Herve, Cosquer Emmanuel, Collot Julien, Foucher Jean-Paul, Klingelhoefer Frauke, Lafoy Yves, Geli Louis (2009). Geophysical characterization of bottom simulating reflectors in the Fairway Basin (off New Caledonia, Southwest Pacific), based on high resolution seismic profiles and heat flow data. Marine Geology, 266(1-4), 80-90. Publisher's official version : https://doi.org/10.1016/j.margeo.2009.07.014 , Open Access version : https://archimer.ifremer.fr/doc/00000/7321/