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

doi:10.19657/j.geoscience.1000-8527.2019.007

Abstract

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

CLC Number:

P539

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.

Figures/Tables 9

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

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

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^*

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

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)

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

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

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

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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