气候变化领域集成服务门户(CCPortal): Cyclostratigraphy of Lower Triassic terrestrial successions in the Junggar Basin; northwestern China

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DOI	10.1016/j.palaeo.2019.109493
	Cyclostratigraphy of Lower Triassic terrestrial successions in the Junggar Basin; northwestern China
	Zhang T.; Zhang C.; Fan T.; Zhang L.; Zhu R.; Tao J.; Li M.
发表日期	2020
ISSN	0031-0182
卷号	539
英文摘要	The astrochronology for the Early Triassic has been constructed from well-preserved marine successions; however, astronomical analyses of terrestrial strata have continued to be rare and problematic. Physical logs (natural gamma ray logging data) from two wells in the Junggar Basin, northwestern China cover the entire Lower Triassic terrestrial Baikouquan Formation and have been shown to be a powerful tool in cycle analysis. Therefore, these logs offer an excellent opportunity to detect astronomically forced sedimentation in a terrestrial setting from mid to high latitudes. Power spectral analysis revealed that the sedimentary cycles had wavelengths of 31.3–35.9 m, 8.4–10.0 m, 4.0–4.6 m, and ~4.0 m. These are interpreted to correspond to the orbital eccentricity cycles of 405 kyr and ~100 kyr and to the obliquity cycles of ~51 kyr and ~34 kyr, respectively. We, thus, established an astronomical time scale for the studied interval, assuming that the 31.3–35.9 m cycles represent the 405 kyr eccentricity cycles. This astrochronology indicated that the duration of the Baikouquan Formation was 2.0 ± 0.1 Myr. Statistical evaluations of optimal sediment accumulation rates using the correlation coefficient approach showed that the rates of the investigated successions were approximately 6.0–12.0 cm/kyr. Orbitally controlled climate change was the major dynamic mechanism for the formation of Early Triassic fan delta successions in the Junggar Basin. © 2019
英文关键词	Astronomical forcing; Astronomical time scale; Baikouquan Formation; Fan delta sedimentation; Nonmarine
语种	英语
scopus关键词	astronomy; climate change; cyclostratigraphy; deltaic sedimentation; eccentricity; fan delta; gamma radiation; geoaccumulation; sedimentation; spectral analysis; Triassic; wavelength; China; Junggar Basin; Xinjiang Uygur
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150641
作者单位	Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Enrichment Mechanism, Ministry of Education, China University of Geosciences, Beijing, 100083, China; School of Energy, China University of Geosciences, Beijing, 100083, China; College of Geoscience, Yangtze University, Wuhan, 430100, China; Research Institute of Exploration and Development, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang, 834000, China; Department of Geosciences, Pennsylvania State University, University ParkPA 16802, United States
推荐引用方式 GB/T 7714	Zhang T.,Zhang C.,Fan T.,et al. Cyclostratigraphy of Lower Triassic terrestrial successions in the Junggar Basin; northwestern China[J],2020,539.
APA	Zhang T..,Zhang C..,Fan T..,Zhang L..,Zhu R..,...&Li M..(2020).Cyclostratigraphy of Lower Triassic terrestrial successions in the Junggar Basin; northwestern China.Palaeogeography, Palaeoclimatology, Palaeoecology,539.
MLA	Zhang T.,et al."Cyclostratigraphy of Lower Triassic terrestrial successions in the Junggar Basin; northwestern China".Palaeogeography, Palaeoclimatology, Palaeoecology 539(2020).