南海北部晚渐新世与早中新世之交T60构造运动的古水深响应

王乙晶; 金海燕; 翦知湣; 徐娟

doi:10.12284/hyxb2021093

南海北部晚渐新世与早中新世之交T60构造运动的古水深响应

doi: 10.12284/hyxb2021093

同济大学海洋地质国家重点实验室，上海 200092

基金项目: 国家重点研发计划（2018YFE0202400）；国家自然科学基金委员会−山东省人民政府海洋科学研究中心联合资助项目（U1606401）；自然资源部全球变化与海气相互作用专项（GASI-GEOGE-04）；国家自然科学基金（91428310，41630965）

详细信息

作者简介:
王乙晶（1995-），男，上海市人，主要从事古海洋与古环境方向研究。E-mail：hpwzc@163.com

通讯作者:
金海燕，副教授，主要从事微体古生物学研究。E-mail：jinhy@tongji.edu.cn

中图分类号: P736
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出版历程
- 收稿日期: 2020-05-11
- 修回日期: 2020-08-27
- 网络出版日期: 2021-04-16
- 刊出日期: 2021-07-06

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

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

摘要

摘要: 本文采用国际大洋发现计划(IODP)第368航次U1501站位井深264.0～331.1 m的样品，通过有孔虫壳体氧同位素地层和锶同位素定年，得出该段井深年龄为晚渐新世−早中新世20.3～32.0 Ma(地震反射不整合面T60的底部年龄在28～30.5 Ma左右)。T60构造运动之后，岩芯沉积物中有机碳含量、底栖有孔虫壳体稳定碳同位素δ¹³C、浮游与底栖有孔虫碳同位素差值Δδ¹³C_P-B指示海水表层生产力的降低；碳酸钙含量、有机碳/氮比值反映了陆源物质输入的减少；结合浮游有孔虫相对丰度以及底栖有孔虫的属种组合变化，共同揭示了南海北部在晚渐新世−早中新世时期，区域构造沉降运动导致了U1501站位在T60之后古水深逐步加深、离岸距离变远，相关结论从微体古生物学角度为认识T60构造事件及其沉积环境变化提供了科学证据。
- 南海北部 /
- T60 /
- 古水深 /
- 表层生产力
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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图 1 IODP 368航次南海U1501站位

Fig. 1 The location of Site U1501 of the IODP 368 in the South China Sea

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图 2 T60地震反射界面所在井深以及其上下深度镜下有孔虫保存度对比

Fig. 2 The photos of foraminiferal fauna preservation under the microscope below and above the T60 depth

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图 3 U1501站有孔虫壳体Sr同位素年龄（井深范围为302.5～331.1 m）

Fig. 3 The foraminifera Sr isotopic age calibration of Site U1501 (core depth ranges from 302.5 m to 331.1 m)

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图 4 U1501站位T60界面上下有机碳含量（a）、底栖有孔虫稳定碳同位素δ¹³C（b）以及浮游与底栖有孔虫δ¹³C差值（c）变化曲线

Fig. 4 The variation of organic carbon content (a), benthic foraminifera δ¹³C (b) and the difference between planktonic and benthic foraminifera δ¹³C (c) below and above the T60 at Site U1501

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图 5 U1501站位 T60附近碳酸钙含量（a）、有机碳/氮比值（b）以及浮游有孔虫相对丰度变化（c）曲线

Fig. 5 The variation of carbonate content (a)、carbon nitrogen ratio (b) and relative abundance of planktonic foraminifera (c) below and above the T60 at Site U1501

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图 6 U1501站位 T60界面附近底栖有孔虫群落组合的丰度变化

Fig. 6 The variation of the abundance of benthic foraminifera community near the reflector T60 at Site U1501

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表 1 U1501站位常见底栖有孔虫属及其对应水深分布

Tab. 1 The identified benthic foraminifera and its distribution with water depth at Site U1501

有孔虫属	环境	水深分布
Siphotextularia spp.	大陆架−大陆坡	<3 000 m
Dentalina spp.	大陆架−大陆坡	<3 000 m
Bolivina spp.	大陆架−大陆坡	<3 000 m
Bulimina spp.	大陆架−大陆坡	<3 000 m
Cibicidoides spp.	大陆架、大陆坡、深海	所有水深
Spiroplectammina spp.	大陆坡−深海	>200 m
Oolina spp.	大陆坡	200～3 000 m
Nodosaria spp.	大陆坡	200～3 000 m
Melonis spp.	大陆坡	200～3 000 m
Hormosina spp.	深海	>3 000 m

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