The response of paleo-water depth to T60 tectonic movement in the northern South China Sea during the late Oligocene to early Miocene

Wang Yijing; Jin Haiyan; Jian Zhimin; Xu Juan

doi:10.12284/hyxb2021093

Volume 43 Issue 5

May 2021

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Wang Yijing，Jin Haiyan，Jian Zhimin, et al. The response of paleo-water depth to T60 tectonic movement in the northern South China Sea during the late Oligocene to early Miocene[J]. Haiyang Xuebao，2021, 43(5)：79–87 doi: 10.12284/hyxb2021093

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The response of paleo-water depth to T60 tectonic movement in the northern South China Sea during the late Oligocene to early Miocene

doi: 10.12284/hyxb2021093

State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China

Received Date: 2020-05-11
Rev Recd Date: 2020-08-27

Available Online: 2021-04-16

Publish Date: 2021-07-06

Abstract

Abstract

Samples of International Ocean Discovery Program (IODP) 368 Site U1501 between core depth 264.0−331.1 m were collected and analyzed in this study. Through foraminifera oxygen isotopic stratigraphy and Sr isotopic dating, the age of this depth interval ranges from early Miocene 20.3 Ma to late Oligocene 32.0 Ma (with seismic reflector T60 bottom age at 28−30.5 Ma). After T60 event, 3 proxies including the content of organic carbon, stable δ¹³C of benthic foraminifera and the difference of δ¹³C between planktonic and benthic foraminifera (Δδ¹³C_P-B) showed the sea surface paleo-productivity weakened; meanwhile, the carbonate content and the organic carbon/nitrogen ratio revealed the terrigenous input decreased. Combined with the changes of relative abundance of planktonic foraminifera and the benthic foraminifera faunal combinations, these paleo-environmental proxies implies that during late Oligocene to early Miocene, the regional tectonic subsidence in the northern South China Sea leaded to the deepening of the paleo-water depth and increasing the offshore distance at Site U1501 after the T60 event. These conclusions provide micropaleontology evidence for better understanding of T60 tectonic event and subsequent sedimentary environment researches.
- the northern South China Sea,
- T60,
- paleo-water depth,
- surface paleo-productivity

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