Subsidence of the northern South China Sea and formation of the Bashi Strait in the latest Miocene; paleoceanographic evidences from 9-Myr high resolution benthic foraminiferal δ18O and δ13C records

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doi: 10.1016/j.palaeo.2016.11.041
Author(s): Tian Jun; Ma Xiaolin; Zhou Jianhong; Wang Wenjie
Author Affiliation(s): Primary:
Tongji University, State Key Laboratory of Marine Geology, Shanghai, China
Other:
Northwest University, China
Volume Title: Palaeogeography, Palaeoclimatology, Palaeoecology
Source: Palaeogeography, Palaeoclimatology, Palaeoecology, Vol.466, p.382-391. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0031-0182 CODEN: PPPYAB
Note: In English. 54 refs.; illus., incl. 1 table, sketch map
Summary: We present astronomically tuned high time resolution (3-4 kyr) benthic foraminiferal δ18O and δ13C records between 9 Ma and 5 Ma from Ocean Drilling Program (ODP) Site 1143 in the southern South China Sea (SCS). We found that the late Miocene ocean carbon shift (LMOCS) which was linked with the late Miocene/early Pliocene "Biogenic Bloom" also occurred in the northern and southern SCS. A marked deep-water δ13C gradient as much as ∼ 1.0 ppm of the northern and southern SCS was observed between 6.5 Ma and 5.9 Ma, which was probably caused by the significant difference in paleoproductivity between the northern and southern SCS. The deep δ13C gradient was likely produced by rapid tectonic subsidence in the northern SCS at ∼ 6.0 Ma and the final formation of the Bashi Strait at ∼ 6.5 Ma. A reversed benthic δ13C gradient of the northern and southern SCS was also observed between 1.2 Ma and 0.35 Ma, which was probably caused by the consecutive closures of the interarc water gates within the Bashi strait at ∼ 3.0 Ma and ∼ 1.2 Ma. Closures of the interarc water gates within the Bashi strait at ∼ 3.0 Ma and ∼ 1.2 Ma further semi-enclosed the SCS basin and made the paleoproductivity the major factor influencing the deep water δ13C, leading to the reversed deep water δ13C gradient of the northern and southern SCS between 1.2 Ma and 0.35 Ma.
Year of Publication: 2017
Research Program: ODP Ocean Drilling Program
Key Words: 02 Geochemistry; 12 Stratigraphy, Historical Geology and Paleoecology; Anomalinidae; Atlantic Ocean; Bashi Strait; Benthic taxa; Biostratigraphy; Buliminacea; C-13/C-12; Cape Basin; Carbon; Cassidulinacea; Cenozoic; Cibicidoides; Foraminifera; Invertebrata; Isotope ratios; Isotopes; Leg 175; Leg 184; Microfossils; Miocene; Neogene; North Pacific; Northern South China Sea; Northwest Pacific; O-18/O-16; ODP Site 1085; ODP Site 1143; ODP Site 1146; ODP Site 1148; Ocean Drilling Program; Ocean basins; Oxygen; Pacific Ocean; Paleo-oceanography; Protista; Rotaliina; South Atlantic; South China Sea; Stable isotopes; Subsidence; Tertiary; Upper Miocene; Uvigerina; Uvigerinidae; West Pacific
Coordinates: N185010 N185010 E1163356 E1163356
N092143 N092143 E1131707 E1131707
Record ID: 2017027327
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands