a Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China b Shandong Institute of Geology Survey, Jinan 250000, Shandong, China c School of Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing 100083, China d Dinosaur Research Center of Zhucheng, Zhucheng 262200, Shandong, China
Abstract The mass burial of dinosaur bone fossils in the Late Cretaceous Wangshi Group in Zhucheng, Shandong Province has been a research focus in recent years. However, the provenance of the dinosaur bone fossils and the accurate depositional age of the bone beds remain ambiguous. Through U?Pb dating of detrital zircons collected from six conglomerate samples from dinosaur bone beds, we found that the youngest single grain age (YSG) of sample 090414-24-D was 77.3 Ma, representing the maximum depositional age of the dinosaur fossil beds and sediments. This also indicates that the Hongtuya Formation was deposited during the Campanian. Dating results revealed an age peak of 120~110 Ma, which corresponds with the peak age of volcanic rocks of the Lower Cretaceous Qingshan Group. The volcanic rocks of the Qingshan Group are mainly exposed in Laiyang, to the north of Zhucheng, although a few also appear to the south and northwest. Through analysis of conglomerate composition and palaeocurrents in the sediments containing the bone beds, we found that the three different data sets of gravel compositions of the conglomerates were mainly composed of volcanic or pyroclastic rocks. Three different data sets of palaeocurrents suggested that the main sediment source of the Wangshi Group dinosaur bone beds was from the north?northwest of the Basin. Only one data set had a provenance south of the basin. This study revealed that the areas of Laiyang and the Yishu Fault Zone were the main provenance areas of both the dinosaur bone fossils and sediments of the Wangshi Group in Zhucheng. The southern margin of the Zhucheng Basin may be a secondary source area. This research provides an important basis for judging the deposition time and sediment source of fossil layers in the Wangshi Group, as well as reconstructing the palaeogeography of the Wangshi Group in the Jiaolai Basin.
Fund:This research was supported by the National Natural Science Foundation Projects (Grant No. 41272021, 41372109, 90914003) and China Geological Survey Project (Grant No. 1212011085477, 12120114064301). We thank Shu-Cai Liu, Sheng-Xian Du for field work assistance and guidance. Moreover, we thank Beijing SHRIMP Center and National Research Center for Geoanalysis for their laboratory assistance. We thank Xiao-Jun Jiang, Ming-Pei Chen and Zhi-Cai Zhu for field work assistance or helpful discussion about the research. At last, we thank the anonymous reviewers for helpful suggestions, and editors for their responsible, meticulous and hard work.
Wei An,Hong-Wei Kuang,Yong-Qing Liu et al. Detrital zircon dating and tracing the provenance of dinosaur bone beds from the Late Cretaceous Wangshi Group in Zhucheng, Shandong, East China[J]. , 2016, 5(1): 72-99.
Wei An,Hong-Wei Kuang,Yong-Qing Liu et al. Detrital zircon dating and tracing the provenance of dinosaur bone beds from the Late Cretaceous Wangshi Group in Zhucheng, Shandong, East China[J]. Journal of Palaeogeography, 2016, 5(1): 72-99.
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