Early Cenozoic paleontological assemblages and provenance evolution of the Lishui Sag, East China Sea
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Abstract: The East China Sea Shelf Basin generated a series of back-arc basins with thick successions of marine- and terrestrial-facies sediments during Cenozoic. It is enriched with abundant oil and gas resources and is of great significance to the petroleum exploration undertakings. Therein, the Lishui Sag formed fan delta, fluvial delta and littoral-to-neritic facies sediments during Paleocene–Eocene, and the research on its sedimentary environment and sediment source was controversial. This study analyzed the paleontological combination characteristics, and conducted a source-to-sink comparative analysis to restore the sedimentary environment and provenance evolution of the Lishui Sag during Paleocene–Eocene based on the integration of detrital zircon U-Pb age spectra patterns with paleontological assemblages. The results indicated that Lishui Sag was dominated by littoral and neritic-facies environment during time corroborated by large abundance of foraminifera, calcareous nannofossils and dinoflagellates. Chronological analysis of detrital zircon U-Pb revealed that there were significant differences in sediment sources between the east and west area of the Lishui Sag. The western area was featured by deeper water depths in the Paleocene–Eocene, and the sediment was characterized by a single Yanshanian peak of zircon U-Pb age spectra, and mainly influenced from Yanshanian magmatic rocks of South China Coast and the surrounding paleo-uplifts. However, its eastern area partly showed Indosinian populations. In particular, the upper Eocene Wenzhou sediments were featured by increasingly plentiful Precambrian zircons in addition to the large Indosinian-Yanshanian peaks, indicating a possible impact from the Yushan Low Uplift to the east. Therefore, it is likely that the eastern Lishui Sag generated large river systems as well as deltas during time. Due to the Yuquan Movement, the Lishui Sag experienced uplifting and exhumation in the late stage of the late Eocene and was not deposited with sediments until Miocene. Featured by transitional-facies depositions of Paleocene–Eocene, the Lishui Sag thus beared significant potential for source rock and oil-gas reservoir accumulation.
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Key words:
- East China Sea /
- Lishui Sag /
- paleontological assemblages /
- sedimentary /
- provenance /
- hydrocarbon exploration
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Figure 1. Simplified geological map and sample locations of the basin in the East China Sea. The samples of datum sources of the Mesozoic Volcanic rock from costal Zhejiang-Fujian were as follows: A1, A2, A3 and A4 were adopted from Xing et al. (2008); B1, B2, B3 and B4 were adopted from Liu et al. (2012); C1, C2, C3, C4 and C5 were adopted from Cui et al. (2010); D1 was adopted from Wang et al. (2003); and G1 was adopted from Dong et al. (2010). The datum sources of Changjiang River, Oujiang, and Taiwan were adopted respectively from Zheng et al. (2013), Xu et al. (2007), and Hou et al (2021).
Figure 3. Zircon U-Pb spectra of the Lishui Depression basement and potential source terranes. The samples datum sources of the Mesozoic volcanic rock from coastal Zhejiang-Fujian were adopted from Xing et al. (2008), Liu et al. (2012), Cui et al. (2010), Wang et al. (2003), and Dong et al. (2010). n is the number of concordant analyses.
Table 1. Dating data table of the Mesozoic volcanic rock from coastal Zhejiang-Fujian
Sample name Dating method Age/Ma Reference Number of particles Location A1 Zircon U-Pb dating 130.1±4 Xing et al., 2008 15 Xianyou, Fujian Province A2 Zircon U-Pb dating 143±7 Xing et al., 2008 6 Xianyou, Fujian Province A3 Zircon U-Pb dating 162±4 Xing et al., 2008 13 Shekou, Fujian Province A4 Zircon U-Pb dating 150±5 Xing et al., 2008 15 Shekou, Fujian Province B1 Zircon U-Pb dating 177±1 Liu et al., 2012 21 Maonong, Zhejiang Province B2 Zircon U-Pb dating 93.8±0.6 Liu et al., 2012 15 Xiaoxiong, Zhejiang Province B3 Zircon U-Pb dating 135.3±10.9 Liu et al., 2012 20 Dashuang, Zhejiang Province B4 Zircon U-Pb dating 138±1 Liu et al., 2012 20 Dashuang, Zhejiang Province C1 Zircon U-Pb dating 120.0±1.4 Cui et al., 2010 15 Wenxi,Qingtian, Zhejiang Province C2 Zircon U-Pb dating 109.4±9.3 Cui et al., 2010 2 Jingjia Moutain, Yongjia, Zhejiang Province C3 Zircon U-Pb dating 118.1±2.3 Cui et al., 2010 12 Dadilin,Tiantai, Zhejiang Province C4 Zircon U-Pb dating 104.1±3.5 Cui et al., 2010 3 Xuantandi, Fenghua, Zhejiang Province C5 Zircon U-Pb dating 102.1±2.2 Cui et al., 2010 4 Jingling, Xinchang, Zhejiang Province D1 Zircon U-Pb dating 117.7±2.7 Wang et al., 2003 8 Fuyang, Zhejiang Province G1 Ar-Ar dating 93.4 Dong et al., 2010 19 Dongji island, Zhoushan, Zhejiang Province -
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