Abstract
The Sulu orogenic belt is an uplift zone that was formed in the Late Triassic. Several Jurassic to Cretaceous sedimentary successions has been recognized within the Sulu orogenic belt in recent studies, including outcrops that are considered to be related to the newly discovered Riqingwei Basin. This basin has been the focus of extensive study due to its continuous Cretaceous rock sequence, geological location and petroleum resource potential. However, the lack of a consolidated chronology for the strata has precluded a better understanding of stratigraphy, tectonic evolution and resource potential of the Riqingwei Basin. Here, we present the results of a new magnetostratigraphic study of the continental scientific drilling borehole LK-1, which is located on Lingshan Island, offshore Shandong province, eastern China. The goals of this study are to (1) refine the Late Jurassic to Early Cretaceous chronostratigraphic framework of the Riqingwei Basin, and (2) investigate the location of the J/K boundary in the Borehole Core LK-1. The observed patterns of the paleomagnetic polarity zone in the LK-1 borehole correlate well with the geomagnetic polarity time scale (GPTS), and the continuous magnetostratigraphy profile defined in this core indicates an age ranging from 146.5 to 125.8 Ma for the samples interval. The sediment accumulation rates (SAR) of LK-1 show one period of high SAR (∼10.5 cm kyr−1) at 135.3–130.6 Ma and two periods of low SAR (∼4.8 and ∼2.2 cm kyr−1) at 145.7–135.3 and 130.6–125.8 Ma, respectively. In addition, the magnetostratigraphic results suggest that the Jurassic-Cretaceous (J/K) boundary of the LK-1 is located within the magnetozone N21.2n (∼1254 m). This comprehensive geochronologic framework provides a good correlation of the marine Upper Jurassic to Lower Cretaceous strata in the Riqingwei Basin to other marine strata and continental sequences, in addition to providing a foundation for the study of the structural evolution of eastern China.
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Acknowledgements
We thank Prof. Chenglong DENG, Shuangchi LIU, Kuang HE and Min ZHANG of the Institute of Geology and Geophysics, Chinese Academy of Sciences, for constructive help in the experiments. We are grateful to Prof. Chunju HUANG of China University of Geosciences (Wuhan) for the helpful discussions and insightful suggestions about the data. We are grateful to Dr. Min ZHANG and Fei HAN for discussions and suggestions on reversal test of inclination of ChRM in cores. We thank the responsible editor and two anonymous reviewers for their constructive comments and suggestions. This work was supported by the National Natural Science Foundation of China (Grant Nos. 42002030, 42072169), National Science and Technology Major Project (Grant No. 2016ZX05024-002-001), the Key R&D Plan of Shandong Province (Grant No. 2017CXGC1608), and the Natural Science Foundation of Shandong Province (Grant No. ZR201910280267).
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Cheng, Y., Wu, Z., Liu, X. et al. Late Jurassic to early Cretaceous magnetostratigraphy of scientific drilling core LK-1 in the Lingshan Island of Riqingwei Basin, eastern China. Sci. China Earth Sci. 65, 742–758 (2022). https://doi.org/10.1007/s11430-021-9865-2
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DOI: https://doi.org/10.1007/s11430-021-9865-2