长江三角洲上新世以来磁性地层及天文调谐年代标尺

谢建磊; 张克信; 马小林; 赵宝成; 张平

doi:10.3799/dqkx.2017.569

长江三角洲上新世以来磁性地层及天文调谐年代标尺

doi: 10.3799/dqkx.2017.569

谢建磊^1,3,,
张克信^1, ,,
马小林²,
赵宝成³,
张平⁴

1.
中国地质大学地球科学学院，湖北武汉 430074
2.
中国科学院地球环境研究所，陕西西安 710061
3.
上海市地质调查研究院，上海 200072
4.
江苏省地质调查研究院，江苏南京 210018

基金项目:

上海区域地质调查片区总结与服务产品开发 DD20160345-07

长江三角洲海岸带综合地质调查与监测 GZH201200506

详细信息

作者简介:
谢建磊(1981-)，男，高级工程师，主要从事区域地质调查和研究工作

通讯作者:
张克信

中图分类号: P534.6
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- 被引次数: 0
出版历程
- 收稿日期: 2017-02-20
- 刊出日期: 2017-10-18

Magnetostratigraphy and Astronomically Tuned Time Scale of Yangtze Delta since Pliocene

1.
School of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China
3.
Shanghai Institute of Geological Survey, Shanghai 200072, China
4.
Jiangsu Institute of Geological Survey, Nanjing 210018, China

摘要

摘要: 长江三角洲地区的磁性地层认识存在很大不确定性.为建立一个可靠的年代标尺，为区内沉积环境和气候演化研究提供约束，在年代地层和磁性地层基础上，以频率磁化率为信号源、ETP为靶曲线，通过轨道调谐方法对区内LZK1孔开展了天文年代标尺研究，建立了年代序列框架.结果显示，M/B界线埋深约为143.0 m、Ga/M界线埋深约为219.0 m、Gi/Ga界线埋深约为296.6 m.受气候和沉积环境控制，沉积旋回特征清楚，沉积速率具有明显的阶段性.调谐后的频率磁化率显示了显著的125 ka、96 ka、41 ka、23 ka、22 ka、18 ka等轨道周期，并在轨道周期上与ETP曲线高度相关，相关性超过了95%检验标准.100 ka、41 ka和23 ka周期的带通滤波曲线与偏心率、斜率和岁差在振幅和相位上吻合较好，但局部时间段有差异，可能与低沉积速率、沉积速率突变或短时间尺度的地层缺失等因素有关.研究表明，在具有短暂沉积缺失的持续沉降区域，只要保证样品分辨率，可以通过轨道调谐方法建立可靠的年代框架.
- 长江三角洲 /
- 磁性地层 /
- 轨道调谐 /
- 天文标尺 /
- 气候周期 /
- 沉积学 /
- 第四纪
Abstract: There is also uncertainty about the magnetostratigraphy in the Yangtze delta. In order to establish a reliable time scale, and provide constraints for sedimentary environment and climate evolution, based on chronostratigraphy and magnetostratigraphy, in this paper astronomical time scale of the LZK1 borehole in the Yangtze delta is researched, and established the chronological framework is established. The results show that M/B, Ga/M and Gi/Ga boundaries locate at 143.0 m, 219.0 m and 296.6 m separately. The deposit cycles are clear and the sedimentary rate has obvious phases, which was influenced by the climate and sedimentary environment. The tuned frequency dependent susceptibility record reveals orbital periods including 125 ka, 96 ka, 41 ka, 23 ka, 22 ka, 18 ka, and is correlated with ETP curves enormously in orbital periods, the confidence interval exceeds 95%. The band-pass filtering curves of 100 ka, 41 ka, 23 ka circles coincide with the corresponding orbital parameter curve in phase and amplitude in total, while existing some inconformities at certain times. The inconformities may be caused by low sedimentary rate or abrupt change of sedimentary rate. In this paper, a conclusion is drawn that in the ongoing subsidence areas with temporary depositional hiatus, as long as the sampling resolution can be assured, we can establish reliable chronological framework by orbital tuning.
- Yangtze delta /
- magnetostratigraphy /
- orbital tuning /
- astronomical time scale /
- climate period /
- sedimentology /
- Quaternary

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图 1 LZK1钻孔和对比钻孔位置

Fig. 1. Location map of borehole LZK1 and nearby boreholes

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图 2 LZK1孔柱状与沉积相划分

Fig. 2. Sedimentary column and facies of borehole LZK1 with OSL and AMS ¹⁴C ages

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图 3 LZK1孔代表性样品退磁曲线的正交矢量投影

Fig. 3. Orthogonal vector projection of typical samples of borehole LZK1

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图 4 LZK1孔柱状、质量(频率)磁化率和极性对比

GPTS引自Gradstein et al.(2012)；岩性剖面中岩性同图 2

Fig. 4. Lithologic column, curves of mass susceptibility and frequency dependent susceptibility of borehole LZK1, polarity with the correlation to the GPTS 2012

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图 5 LZK1孔初始年代模型、沉积速率及频谱分析、深海氧同位素对比

黑色粗线为5点滑动平均曲线，0~5.3 Ma氧同位素数据引自Lisiecki and Raymo(2005)；其他引自Zachos et al.(2001)

Fig. 5. Curves of initial time scale and sedimentary rate, spectrum analysis and χ_fd of borehole LZK1, comparison with marine oxygen isotope

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图 6 LZK1孔天文年代标尺和频率磁化率滤波与轨道参数对比、与ETP交叉频谱分析

Fig. 6. Astronomically tuned time scale, comparison between χ_fd band-pass filtering curves and the orbital parameters, and cross spectrum analysis with ETP, of borehole LZK1

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图 7 LZK1孔基于天文年代标尺的频率磁化率频谱分析及深度-时间对应曲线

Fig. 7. Spectrum analysis of χ_fd based on astronomically tuned time scale and the depth-time curve of borhole LZK1

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表 1 光释光测年结果

Table 1. OSL ages for sediments from LZK1 borehole

野外编号	埋深 (m)	U (10^-6)	Th (10^-6)	K (%)	等效剂量 (Gy)	年剂量 (Gy/ka)	含水量 (%)	年龄 (ka)
gsg-1	13.6	1.80	9.80	1.80	4.94±0.37	3.02	27.26	1.6±0.1
gsg-2	14.0	2.56	13.7	2.25	6.50±0.19	3.78	36.92	1.7±0.1
gsg-5	41.6	2.30	12.7	2.26	41.04±0.71	3.71	29.98	11.1±0.5
gsg-6	43.3	1.76	8.70	1.63	43.62±0.31	2.77	22.68	15.6±0.6
gsg-7	57.0	1.54	7.25	1.77	82.56±1.17	2.74	20.39	30.1±1.3
gsg-8	86.8	1.20	5.56	1.82	168.70±2.90	2.67	10.82	63.2±3.4
gsg-9	87.5	2.91	15.5	2.68	435.76±15.62	4.56	27.35	95.5±5.1
gsg-10	107.1	3.11	14.4	2.24	532.54±6.40	4.28	20.57	124.5±5.2

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表 2 AMS ¹⁴C测年结果

Table 2. AMS ¹⁴C ages for sediments from LZK1 borehole

野外编号	埋深 (m)	直接测年年龄 (a BP)	惯用年龄 (a BP)	日历校正年龄 2δ(a BP)	¹³C/¹²C比值 (%)
AC-1	20.6	2 660±30	3 000±30	2 760~2 690	-4.4
AC-2	21.2	2 710±30	3 110±30	2 910~2 760	-0.6
AC-3	30.8	4 480±30	4 890±30	5 260~5 030	-0.3
AC-5	32.8	5 890±30	6 290±30	6 760~6 630	-0.6

下载: 导出CSV

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