TY - JOUR
T1 - Late Cretaceous stratigraphy and paleoceanographic evolution in the Great Australian Bight Basin based on results from IODP Site U1512
AU - MacLeod, Ken
AU - White, Lloyd
AU - Wainman, Carmine
AU - Martinez, Mathieu
AU - Jones, Matthew
AU - Batenburg, Sietske
AU - Riquier, Laurent
AU - Haynes, Shannon
AU - Watkins, David
AU - Bogus, Kara
AU - Brumsack, Hans
AU - do Monte Guerra, Rodrigo
AU - Edgar, Kirsty
AU - Edvardsen, Trine
AU - Tejada, Marissa
AU - Harry, Dennis
AU - Hasegawa, Taka
AU - Hobbs, Richard
AU - Huber, Brian
AU - Jiang, Toa
AU - Kuroda, Jun
AU - Young Lee, Eun
AU - Li, Y
AU - Maritati, Alessandro
AU - O'Connor, Lauren
AU - Petrizzo, Maria Rose
AU - Quan, Tracy
AU - Richter, Carl
AU - Tagliaro, Gabriel
AU - Wolfgring, Erik
AU - Xu, Zhaokai
PY - 2020/7
Y1 - 2020/7
N2 - The Upper Cretaceous sedimentary sequence at International Ocean Discovery Program Site U1512 in the Ceduna Sub-basin of the Great Australian Bight represents a continuous, > 690 m thick interval of black silty clay and claystone spanning the lower Turonian through Lower Campanian (~10 million years). Sediments were deposited in an elongate, ~E-W oriented, ~2500 km long rift system that developed between Australia and Antarctica with an open-ocean connection to the west and a continental bridge to the east. Site U1512 cores provide a unique, continuous record of Late Cretaceous deposition in the Ceduna Sub-basin on the hanging wall of the Wallaroo Fault Zone. Study of U1512 samples could provide both an important high-latitude, southern hemisphere perspective on climatic evolution during the peak and demise of the Cretaceous hothouse and an offshore record of the sedimentation history in the basin during the Late Cretaceous portion of the Gondwanan breakup. The Upper Cretaceous sequence at Site U1512 is notable for its lithologic uniformity. Burrow-mottled to massive claystone and silty claystone make up the majority of the almost 700 m section, while rare (n = 28) isolated, 2 to 21 cm thick medium to fine sandstone beds are a minor lithology. Macrofossils present include common inoceramids and rare occurrences of other bivalves and ammonites. Microfossils include common occurrences of calcareous nannofossils, agglutinated and calcareous benthic foraminifera, radiolaria and organic-walled dinoflagellate cysts as well as rare, small, surface dwelling planktonic foraminifera. Carbonate (<7%) and organic carbon (<1.5%) contents are low. Despite the lithologic uniformity, rhythmic alternations in the intensity of magnetic susceptibility and natural gamma radiation are well-resolved in much of the recovered section and continue through minor coring gaps (as documented by downhole logs). Data from Site U1512 provide new perspectives on the deep-water frontier region between Antarctica and Australia.
AB - The Upper Cretaceous sedimentary sequence at International Ocean Discovery Program Site U1512 in the Ceduna Sub-basin of the Great Australian Bight represents a continuous, > 690 m thick interval of black silty clay and claystone spanning the lower Turonian through Lower Campanian (~10 million years). Sediments were deposited in an elongate, ~E-W oriented, ~2500 km long rift system that developed between Australia and Antarctica with an open-ocean connection to the west and a continental bridge to the east. Site U1512 cores provide a unique, continuous record of Late Cretaceous deposition in the Ceduna Sub-basin on the hanging wall of the Wallaroo Fault Zone. Study of U1512 samples could provide both an important high-latitude, southern hemisphere perspective on climatic evolution during the peak and demise of the Cretaceous hothouse and an offshore record of the sedimentation history in the basin during the Late Cretaceous portion of the Gondwanan breakup. The Upper Cretaceous sequence at Site U1512 is notable for its lithologic uniformity. Burrow-mottled to massive claystone and silty claystone make up the majority of the almost 700 m section, while rare (n = 28) isolated, 2 to 21 cm thick medium to fine sandstone beds are a minor lithology. Macrofossils present include common inoceramids and rare occurrences of other bivalves and ammonites. Microfossils include common occurrences of calcareous nannofossils, agglutinated and calcareous benthic foraminifera, radiolaria and organic-walled dinoflagellate cysts as well as rare, small, surface dwelling planktonic foraminifera. Carbonate (<7%) and organic carbon (<1.5%) contents are low. Despite the lithologic uniformity, rhythmic alternations in the intensity of magnetic susceptibility and natural gamma radiation are well-resolved in much of the recovered section and continue through minor coring gaps (as documented by downhole logs). Data from Site U1512 provide new perspectives on the deep-water frontier region between Antarctica and Australia.
KW - Cretaceous greenhouse climate
KW - Gondwana breakup
KW - Cretaceous paleoceanography
KW - Great Australian Bight
KW - Australo-Antarctic rifting
UR - http://www.scopus.com/inward/record.url?scp=85081283533&partnerID=8YFLogxK
U2 - 10.1016/j.gr.2020.01.009
DO - 10.1016/j.gr.2020.01.009
M3 - Article
SN - 1342-937X
VL - 83
SP - 80
EP - 95
JO - Gondwana Research
JF - Gondwana Research
ER -