天津蓟县剖面前寒武系洪水庄组—铁岭组米兰科维奇旋回

doi:10.19657/j.geoscience.1000-8527.2019.007

现代地质 ›› 2019, Vol. 33 ›› Issue (05): 979-989.DOI: 10.19657/j.geoscience.1000-8527.2019.007

天津蓟县剖面前寒武系洪水庄组—铁岭组米兰科维奇旋回

任传真¹^,²(), 褚润健¹^,², 吴怀春¹^,²(), 房强¹^,²

1.中国地质大学(北京) 生物地质与环境地质国家重点实验室,北京 100083
2.中国地质大学(北京) 海洋学院,北京 100083

收稿日期:2019-04-25 修回日期:2019-06-27 出版日期:2019-10-26 发布日期:2019-10-28
通讯作者: 吴怀春
作者简介:吴怀春, 男,教授,博士研究生导师,1977年出生,海洋地质学专业,主要从事旋回地层学和海洋地质学的教学和科研工作。Email: whcgeo@cugb.edu.cn。
任传真, 男,硕士研究生,1994年出生,地质工程专业,主要从事旋回地层学科研工作。Email: chuanzh_Ren@163.com。
基金资助:
国家自然科学基金项目(41790451);国家自然科学基金项目(41422202)

Milankovitch Cycles of the Precambrian Hongshuizhuang-Tieling Formations at Jixian Section in Tianjin

REN Chuanzhen¹^,²(), CHU Runjian¹^,², WU Huaichun¹^,²(), FANG Qiang¹^,²

1. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Beijing 100083, China
2. School of Ocean Sciences, China University of Geosciences, Beijing 100083, China

Received:2019-04-25 Revised:2019-06-27 Online:2019-10-26 Published:2019-10-28
Contact: WU Huaichun

摘要/Abstract

摘要：

显生宙沉积旋回会受到地球轨道参数偏心率、地轴斜率和岁差的周期性变化(米兰科维奇旋回)的控制,但目前对前寒武系的相关研究较为薄弱。天津蓟县剖面中元古界洪水庄组—铁岭组为一套潟湖-潮坪相沉积,主要呈砂岩—页岩互层的韵律性产出。为探索这种岩性韵律是否与轨道旋回有关,对其进行了高分辨率的岩性刻画,并以磁化率和伽马能谱数据作为古气候-古环境替代性指标,通过频谱分析等方法进行旋回地层学分析。结果表明各指标均记录了完整的米兰科维奇旋回。铁岭组一段下部由短偏心率、斜率和岁差控制的地层旋回厚度分别为1.2~1.5 m、0.4 m和0.17~0.19 m,其中0.1 m的半岁差周期也较明显;洪水庄组二段顶部由长偏心率、短偏心率、斜率和岁差控制的地层旋回厚度分别为1.1~1.8 m、0.34~0.54 m、0.14~0.16 m和0.08~0.09 m。以识别出的稳定长偏心率周期405 ka旋回对洪水庄组进行了天文年代校准,并估计出当时的短偏心率、斜率以及岁差周期分别为100 ka、22~24 ka和15 ka。在洪水庄组中记录的偏心率振幅变化周期为~2 Ma,比现今~2.4 Ma的周期略短。

关键词: 天文校准, 沉积旋回, 超长偏心率, 亚米兰科维奇旋回

Abstract:

Sedimentary cycles preserved in the Phanerozoic Eon can be associated with the changes in the ellipticity of Earth’s orbit, the tilt and the precession of Earth’s rotational axis, but evidence from the Precambrian sequences is still lacking. The Mesoproterozoic Hongshuizhuang-Tieling formations at the Jixian section in Tianjin were deposited in the lagoonal-tidal flat environment, and are dominated by rhythmic sand-shale interbeds. To explore whether the rhythmic sequences are related to the Milankovitch cycles, a high-resolution cyclostratigraphy study was conducted on the paleoclimate-paleoenvironment proxies of the lithology, magnetic susceptibility (MS), and gamma-ray (GR) features of the Hongshuizhuang-Tieling formations. Spectral analyses show that the wavelength ratios of the cycles in these stratigraphic units correspond to the hierarchies of the Mesoproterozoic Milankovitch cycles. The sedimentary cycles of 1.2-1.5 m, 0.4 m and 0.17-0.19 m can be associated with the short eccentricity, obliquity and precession, respectively, in the lower part of Member 1 of the Tieling Formation. The 0.1 m sedimentary cycle may be associated with semi-precession cycle in the Tieling Formation. The major sedimentary cycles of 1.1-1.8 m, 0.34-0.54 m, 0.14-0.16 m and 0.08-0.09 m are considered to be caused by long and short eccentricity, obliquity, and precession in the upper part of Member 2 of the Hongshuizhuang Formation, respectively. After calibrating to the 405 ka long eccentricity cycles, the spectra represent periods of the 100 ka short eccentricity, 22-24 ka obliquity and 15 ka precession, respectively. Moreover, the eccentricity amplitude modulation cycles show main periodicities of ~2.0 Ma, which is shorter than that at present (~2.4 Ma).

Key words: astronomical calibration, sedimentary cycle, long-term eccentricity, sub-Milankovitch cycle

中图分类号:

P539

任传真, 褚润健, 吴怀春, 房强. 天津蓟县剖面前寒武系洪水庄组—铁岭组米兰科维奇旋回[J]. 现代地质, 2019, 33(05): 979-989.

REN Chuanzhen, CHU Runjian, WU Huaichun, FANG Qiang. Milankovitch Cycles of the Precambrian Hongshuizhuang-Tieling Formations at Jixian Section in Tianjin[J]. Geoscience, 2019, 33(05): 979-989.

图/表 9

图1 研究区古地理位置及年代地层框架 (a)1.4 Ga全球古地理重建图(修改自Zhang等[19]),红五星代表蓟县剖面位置;(b)蓟县剖面岩性分布和数据采集点位置(修改自李怀坤等[24]);(c)雾迷山组、铁岭组和下马岭组地质年代(据李怀坤等[24]和Zhang等[4])

Fig.1 Paleogeography and chronological framework map of the study area

图2 铁岭组和洪水庄组受地球轨道力控制的岩性旋回 (a)铁岭组下部石英砂岩和粉砂质页岩呈现韵律层;(b)(a)图中2.79 m段对应的厘米级层束组解释为斜率(O)旋回;(c)洪水庄组二段墨绿色粉砂质伊利石页岩韵律层,1~2 m的旋回层解释为405 ka长偏心率(E)旋回;(d)洪水庄组二段厘米级旋回层解释为斜率(O)和岁差(P)旋回

Fig.2 Relationships between lithological cycles and Milankovitch-cycle-forced sedimentary bundling patterns in the Tieling-Hongshuizhuang formations

表1 铁岭组古气候指标相关性矩阵

Table 1 Paleoclimatic proxy correlation matrix of Tieling Formation

	GR	K	U	Th	MS
K	0.96^*
U	0.25^*	0.11
Th	0.84^*	0.78^*	0.01
MS	0.20^*	0.16^*	0.11	0.23^*
岩性	-0.20^*	-0.21^*	0.06	-0.22^*	-0.10^*

图3 铁岭组一段下部(0~8 m)旋回地层解释岩性编码滤波中心频率为(0.762 5±0.452 0)旋回/m;MS滤波中心频率为(0.770 6±0.435 0)旋回/m;GR滤波中心频率为(0.658 3±0.354 0)旋回/m;K滤波中心频率为(0.658 4±0.324 0)旋回/m;Th滤波中心频率为(0.742 9±0.432 0)旋回/m;灰色阴影显示出各指标间相似的短偏心率(e)旋回信号

Fig.3 Cyclostratigraphy of the lower part (0~8 m)of Member 1 of the Tieling Formation

图4 铁岭组古气候替代性指标频谱分析(a)和理论地球轨道周期变化曲线(b)

Fig.4 Spectral analyses of the paleoclimate proxy data from the Tieling Formation (a) and predicted Earth orbital period changes since 2 000 Ma (b)

图5 洪水庄组二段顶部(18.0~51.7 m)磁化率(MS)序列旋回地层学分析 (a)去趋势化后磁化率(MS)序列(黑色)和长偏心率信号带通滤波结果(红色,地层18.0~32.0 m和32.0~51.7 m分别使用高斯带通滤波参数(0.55±0.1) m-1和(0.96±0.1) m-1);以405 ka长偏心率周期为基准,根据长偏心率信号滤波输出深度域周期估算出沉积速率变化曲线;(b)去趋势化后磁化率序列(白噪声>3 m)2π MTM频谱分析和滑动窗口(滑动窗口设为3 m,步长为0.2 m)频谱分析,E为长偏心率,e为短偏心率,O为斜率,P为岁差;(c)eASM分析得到的沉积速率变化,输入为去趋势化后的磁化率序列,滑动窗口设为3 m,步长为0.1 cm,每个窗口的序列添零为5 000;天文轨道频率设为1/405 ka-1、1/100 ka-1、1/25 ka-1、1/15 ka-1[43];10 000次蒙特卡洛模拟;每个窗口的ASM估计的沉积速率范围为0.10~0.61 cm/ka

Fig.5 Cyclostratigraphic analysis of the MS series from the 18-51.7 m interval of the upper part of Member 2 of Hongshuizhuang Formation after detrending

图6 405 ka长偏心率周期天文校准后洪水庄组时间域磁化率序列的频谱分析和偏心率、斜率调制信号与新生代天文解决方案(La2004)调制周期 (a)时间域磁化率序列2π MTM频谱分析和滑动窗口(窗口为600 ka)频谱分析,长偏心率滤波输出(用高斯方法利用(0.002 5±0.001 0)周期/ka作为滤波通带)和偏心率调制长周期信号(红色包络线),斜率滤波输出(用高斯方法利用(0.043±0.008)周期/ka作为滤波通带)和斜率调制长周期信号(红色包络线);(b)9 700~20 300 ka的La2004 ETP曲线滑动窗口分析(截取频率范围为0~0.03 周期/ka,窗口为600 ka,步长为10 ka),表现出斜率和偏心率调制长周期

Fig.6 Spectral analysis of the time domain MS series, which was calibrated by long eccentricity cycles in the Hongshuizhuang Formation to an artificial 405 ka eccentricity target curve, amplitude modulation of eccentricity and obliquity, and the modulation period of Cenozoic astronomical solution of La2004

表2 洪水庄组、铁岭组和下马岭组米兰科维奇旋回周期

Table 2 Period Milankovitch cycles of the Hongshuizhuang, Tieling and Xiamaling formations

	长偏心率	短偏心率	斜率	岁差
天文模型^[41]/ka	405	100	25	15
与岁差之比^*	27	6.7	1.7	1
下马岭组^a/cm	200	55~66	13~15	6~8
铁岭组^a/cm		120~150	40	17~19
洪水庄组^a/cm	110~180	34~54	14~16	8~9
洪水庄组^b/ka	405	128	22~24	15
下马岭组^b/ka	405	131

图7 14亿年前地质记录隐含的天文偏心率调制长周期与10~20 Ma的天文解决方案对比 (a)洪水庄组古气候替代性指标(Th、U、K、GR和MS)时间序列在频率范围0~0.015 ka-1内的2πMTM频谱分析和滑动窗口分析(窗口为600 ka,步长为100 ka),从磁化率(MS)序列提取的短偏心率和长偏心率带宽能量变化曲线,阴影表示~2 Ma的超长周期;(b)La2004 ETP[42]曲线在9 700~20 300 ka的滑动窗口分析结果(截取频率范围0~0.015 ka-1,窗口为600 ka,步长为10 ka),从La2004提取的短偏心率和长偏心率带宽能量变化曲线,磁化率和La2004 ETP[40]曲线的长偏心率能量、短偏心率能量和总能量截止频率范围分别为1/600~1/200 ka-1,1/150~1/50 ka-1和0~Nyquist频率;阴影表示~2.4 Ma的超长周期

Fig.7 Comparison between the long period of eccentricity modulation implied in geological records 1.4 Ga with the astronomical solution of 10-20 Ma (La2004)

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天津蓟县剖面前寒武系洪水庄组—铁岭组米兰科维奇旋回

Milankovitch Cycles of the Precambrian Hongshuizhuang-Tieling Formations at Jixian Section in Tianjin

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[2]	汪新伟，沃玉进,张荣强. 扬子克拉通南华纪-早古生代的构造-沉积旋回[J]. 现代地质, 2008, 22(4): 525-533.