Journal of Tropical Oceanography ›› 2026, Vol. 45 ›› Issue (5): 80-93.doi: 10.11978/2025246CSTR: 32234.14.2025246
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SU Xiang1,2(
), XIANG Rong1,2(
), YI Liang3, ZHANG Qiang1,2, ZHANG Yanan4, QIN Guoquan5, WAN Sui1,2, YAN Wen1,2,6(
)
Received:2025-12-20
Revised:2026-02-07
Online:2026-09-10
Published:2026-10-13
Contact:
XIANG Rong. email: Supported by:CLC Number:
SU Xiang, XIANG Rong, YI Liang, ZHANG Qiang, ZHANG Yanan, QIN Guoquan, WAN Sui, YAN Wen. Microfossils in the Neogene carbonate platform of Nansha Islands and their significance*[J].Journal of Tropical Oceanography, 2026, 45(5): 80-93.
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Fig. 1
Locality map of Well NK-1 on Nansha Islands. (a) Topographic map of the SCS. The red star and dots denote the study site NK-1 in the Nansha Islands, sites CK-2 and XK-1 in the Xisha Islands, respectively; (b) The location of Meiji Atoll in Nansha Islands. The blue areas denote the modern biogenic reefs in the southern SCS; (c) Location of Well NK-1 on Meiji Atoll"
Fig. 3
Calcareous nannofossils in Well NK-1 1. Gephyrocapsa oceanica (10.54m); 2. Emiliania huxleyi (10.54m); 3. Cyclicargolithus floridanus (562.88m); 4. Reticulofenestra haqii (840.35m); 5. Reticulofenestra minuta (994.45m); 6. Reticulofenestra producta (565.53m); 7. Reticulofenestra pseudoumbilicus (558.30m); 8. Reticulofenestra bisecta (< 10μm) (669.1m); 9. Sphenolithus heteromorphus (562.88m); 10. S. heteromorphus (840.35m); 11. Sphenolithus moriformis (1000.80m); 12. Coronocyclus nitescens (809.85m); 13. Pontosphaera spp. (831.13m); 14. Coccolithus pelagicus (669.10m); 15. Helicosphaera carteri (977.15m); 16. Umbilicosphaera jafari (1000.80m)"
Fig. 4
Foraminifers in Well NK-1 1~2. Globigerinoides extremus (Bolli) (200.78m); 3~4. Dentoglobigerina altispira (Cushman and Jarvis) (210.48m); 5~6. Globoquadrina dehiscens (Chapman, Parr and Collins) (469.38m); 7. Turborotalia siakensis (LeRoy) (810.3m); 8. Globigerinoides subquadratus Brönnimann (850.5m); 9. Amphistegina lessonii d’Orbigny (850.5m); 10. Heterostegina depressa d’Orbigny (991.1m); 11. Operculina ammonoides (Gronovius) (850.5m); 12. Nephrolepidina verbeeki (Newlon et Holland) (991.1m); 13. Quinqueloculina sp. (760.4m); 14. Triloculina trigona Cushman (760.4m); 15. Pyrogo sp. (760.4m); 16. Textularia sp. (991.1 m)"
Tab. 1
Biostratigraphic events of Well NK-1"
| 时代 | 化石类型 | 化石带 | 生物地层事件 | 深度/m | 年龄/Ma | 阶段 | 参考文献 |
|---|---|---|---|---|---|---|---|
| 更新世 | 钙质超微化石 | NN21 | Emiliania huxleyi初现面 | 19.2 | 0.29 | 4 | Gradstein等( |
| 浮游有孔虫 | PL6 | Globigerinoides extremus末现面 | 200.8 | 2.40 | 3 | 秦国权( | |
| 上新世 | 浮游有孔虫 | PL5 | Globoquadrina altispira末现面 | 210.5 | 2.80 | ||
| 中新世 | 浮游有孔虫 | M12 | Globoquadrina dehiscens末现面 | 469.4 | 10.00 | ||
| 钙质超微化石 | NN7 | Cyclicargolithus floridanus末现面 | 562.9 | 11.85 | 2 | Gradstein等( | |
| 钙质超微化石 | NN6/5 | Sphenolithus heteromorphus末现面 | 562.9 | 13.53 | |||
| 钙质超微化石 | NN4 | Sphenolithus heteromorphus初现面 | 845.6 | 17.71 |
Fig. 8
Carbonate platform developments in the SCS. (a) age-depth relationships of the deep drilling cores in Nansha and Xisha Islands; The age-depth data of cores CK-2 and XK-1 are from Fan et al (2020) and Yi et al (2018), respectively; (b) growth rates of the three cores; (c) global climatic events and tectonic events in the SCS; (d) the global compilation of sea-level variations (Miller et al, 2020)"
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