Detrital Zircon U-Pb Geochronology of the Es2 Sandstones of Lvda 29-1 Structure of the Eastern Bohai Sea, and Its Implication for Provenance
doi: 10.14027/j.issn.1000-0550.2018.149
- Received Date: 2018-04-23
- Rev Recd Date: 2018-06-13
- Publish Date: 2019-02-10
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Key words:
- Lvda 29-1 Structure /
- provenance /
- detrital zircon U-Pb ages /
- Mesoproterozoic /
- Neoproterozoic
Abstract: To trace the sedimentary source-to-sink systems of the Lvda 29-1 structure in the eastern Bohai Sea, six sandstone cuttings of the second Member of Shahejie Formation (Es2) were collected from LD29-1-1, LD29-1-1Sa and LD29-1-2 for detrital zircon U-Pb dating and cathodoluminescence (CL) image analysis. The results showed that the sandstones of LD29-1-1 contained 41.2% Cretaceous (K) zircons and featured a 108 Ma peak, and the columnar crystals were characterized by sharp edges. The LD29-1-1Sa and LD29-1-2 sandstones contained 74%-75% Mesoproterozoic (Pt2) zircons with peaks at ~1.5 Ga and ~1.8 Ga, and the broken crystals were well rounded. We concluded that the Es2 sandstones of LD29-1-1 were near-source deposited, and the provenance was the Mesozoic sedimentary rocks along the slope of the Changxingdao Uplift; the Es2 sandstones of LD29-1-1Sa and LD29-1-2 were distal from the source area and were dominated by the widespread Mesoproterozoic and Neoproterozoic sedimentary rocks exposed in Fuzhou on the western Liaodong Peninsula, with only a slight influence of Mesozoic sedimentary rocks from the slope of the Changxingdao Uplift.
Citation: | ZHAO Meng, DU XiaoFeng, WANG QingBin, FENG Chong, PANG XiaoJun, LI Huan. Detrital Zircon U-Pb Geochronology of the Es2 Sandstones of Lvda 29-1 Structure of the Eastern Bohai Sea, and Its Implication for Provenance[J]. Acta Sedimentologica Sinica, 2019, 37(1): 62-71. doi: 10.14027/j.issn.1000-0550.2018.149 |