FN Archimer Export Format
PT J
TI Upper Cretaceous to Palaeogene successions of the Gouaro anticline: Deepwater sedimentary records of the tectonic events that led to obduction in New Caledonia (SW Pacific)
BT 
AF Bordenave, Aurélien
   Etienne, Samuel
   Collot, Julien
   Razin, Philippe
   Patriat, Martin
   Grélaud, Carine
   Agnini, Claudia
   Morgans, Hugh
   Guillemaut, Flora
   Moreau, Armand
AS 1:1,2,3;2:2;3:2;4:3;5:4;6:3;7:5;8:6;9:3;10:3;
FF 1:;2:;3:;4:;5:PDG-REM-GM-LAD;6:;7:;8:;9:;10:;
C1 ADECAL Technopole, 1bis rue Berthelot, BP 2384, 98845 Nouméa, New Caledonia
   Geological Survey of New Caledonia (DIMENC), BP465, 98845 Nouméa Cedex, New Caledonia
   Université Bordeaux Montaigne/EA 4592 Géoressources & Environnement, 1 allée Fernand Daguin, 33607 Pessac Cedex, France
   IFREMER - Centre Bretagne - ZI de la Pointe du Diable, CS 10070, 29280 Plouzané, France
   Department of Geosciences, University of Padova, Padova, Italy
   GNS Science, Lower Hutt, New Zealand
C2 ADECAL TECHNOPOLE, FRANCE
   DIMENC, FRANCE
   UNIV BORDEAUX, FRANCE
   IFREMER, FRANCE
   UNIV PADOVA, ITALY
   GNS SCIENCE, NEW ZEALAND
SI BREST
SE PDG-REM-GM-LAD
IN WOS Ifremer UPR
   copubli-france
   copubli-europe
   copubli-univ-france
   copubli-int-hors-europe
IF 3.329
TC 5
UR https://archimer.ifremer.fr/doc/00679/79082/89150.pdf
   https://archimer.ifremer.fr/doc/00679/79082/93568.pdf
LA English
DT Article
DE ;Zealandia;New Caledonia;Upper Cretaceous;Palaeogene;Turbidite;Obduction
AB In New Caledonia, upper Cretaceous to Palaeogene sedimentary rocks record a regional tectonic shift from Cretaceous extension to Eocene compression, which led to the obduction of oceanic mantle onto the northeastern tip of the submerged Zealandia continent. This study provides new descriptions of these successions in the region of the Gouaro anticline, from outcrops and an extensively cored, 1.9 km long onshore petroleum well, CADART-1. Combined sedimentological, palaeontological and mineralogical data allow us to propose a revised lithostratigraphic framework and to discuss sedimentary sources, basin physiography and vertical tectonic motions. The base of the studied section comprises an upper Cretaceous transgressive syn- to post-rift siliciclastic succession (Gouaro Formation) culminating in deepwater silicified mudstones. Our biostratigraphic analysis suggests that the Palaeocene and Lower Eocene are not present in the studied section. During the middle Eocene, sedimentation is dominated by deepwater pelagic carbonates and calciturbidites (Adio Limestone). The middle to upper Eocene is marked by a 4 km thick, lithologically heterogeneous turbidite succession, the Bourail Flysch Group, divided into: (i) the Lutetian to Bartonian Lower Bourail Flysch Formation, comprising mixed siliciclastic - calcareous turbidites; (ii) the Bartonian to Priabonian Middle Bourail Flysch Formation, dominated by calcareous turbidites; and (iii) the uppermost Eocene (to Oligocene?) Upper Bourail Flysch Formation consisting of clinopyroxene-rich volcaniclastic turbidites and extraformational breccias. Two successive phases of clastic fluxes occurred, the former during the Lutetian-Bartonian and the latter during the uppermost Priabonian, separated by a period of drowning and/or subsidence during the Bartonian to Priabonian. These phases are likely controlled by vertical motions and we discuss their possible tectonic origin. Of particular note is that we believe that within the Bourail Basin, horizontal shortening and nappe emplacement are only recorded during the latest Eocene and possibly Oligocene. Indeed, the second phase of clastic flux is associated with debris flow breccia, possibly derived from a thrust front, yet we discuss alternative origins such as fault scarp erosion or intraslope failures. 
PY 2021
PD APR
SO Sedimentary Geology
SN 0037-0738
PU Elsevier BV
VL 415
UT 000654040300002
DI 10.1016/j.sedgeo.2020.105818
ID 79082
ER

EF