THE INVERSION OF LATE QUATERNARY PALEO-WATER DEPTH IN SOUTHWESTERN OFFSHORE HAINAN ISLAND
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摘要:
晚第四纪以来，因古气候和海平面发生多次变化，南海西北部经历了海岸线变迁和海陆演变多个过程。利用钻孔测年和高分辨率单道地震资料开展对比、划分了7个主要地震反射界面并确定其时代。同时基于现今水深数据，依据全球海平面变化曲线和地层厚度，对海南岛西南海域晚第四纪(100.1~40.7 kaBP)以来的古水深和海岸线进行反演。反演结果表明，100.1 kaBP时，海南岛西部、西北和南部局部地区海岸线向海方向移动, 陆域面积略微增加, 海域陆架较窄，最大水深超过550 m，海底地形以陆坡深水区为主。78.1 kaBP时，海南岛西部海岸线发生较大规模迁移，陆域面积增加，陆架变宽，海底地形平缓。大部分区域水深均小于200 m。49.9~40.7 kaBP，海南岛西部陆域面积进一步扩大，海底地形平坦，水深变浅，地形以陆架区浅水区为主。研究表明，100.1~40.7 kaBP以来研究区的水深变浅，地形变为平缓，海岸线向海迁移，区域古气候、海平面变化以及物源供应对塑造海底地形地貌具有重要的作用。
Abstract:There are several cycles of coastal line migration and water-land inversion in the northwestern South China Sea due to climate and sea level changes during late Quaternary. Seven seismic reflectors have been recognized and dated based on high resolution seismic profiles and drilling cores. The inversion of late Quaternary (100.1~40.7 kaBP) paleo-water depth and coastal line have been build based on modern water depth, global sea level change curves and thickness of sediment in the study area. The inversion results indicate that part of the coastal line in western, northwestern and southern Hainan Island migrated seawards 100.1 kaBP. The water depth was larger than 550 m with a narrow shelf in the study area then. The shelf area became larger with a flat sea floor at 78.1 kaBP. The western coastal line migrate to sea in large scale with more land area exposed.The water depth was less than 200m. Factors suggest that the paleo-water depth and coastal line was controlled by climate, sea level changes and sediment supply.
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Key words:
- Hainan Island /
- Late Quaternary /
- paleo-water depth /
- inversion /
- sea level change
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表 1 地震反射界面时间-深度
Table 1. The time-depth of seismic reflectors
反射界面 双程走时/ms 深度/m 海底 55 0 R1 63 6.4 R2 69 11.2 R3 86 24.8 R4 103 38.4 R5 128 58.4 R7 150 76.0 
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表 2 HDQ2钻孔AMS-14C和光释光测年结果
Table 2. The AMS-14C and OSL age of Core HDQ2
样品编号 深度/m 年代/ka 误差/a 校正年龄/cal. kaBP 标准偏差/a 测年方法 1 0.01 4.300 ±30 4.320~4.520 AMS-14C 2 0.63 9.740 ±38 11.220~11.169 AMS-14C 3 1.10 23.734 ±85 28.435 ±168 AMS-14C 4 3.40 28.620 ±113 34.014 ±185 AMS-14C 5 3.60 35.501 ±188 40.813 ±241 AMS-14C 6 7.00 33.405 ±166 38.796 ±221 AMS-14C 7 8.05 35.300 ±370 38.620~40.240 AMS-14C 8 9.50 25.268 ±143 30.421 ±209 AMS-14C 9 14.25 31.111 ±159 36.473 ±207 AMS-14C 10 19.99 43.180 ±920 44.400~48.050 AMS-14C 11 22.70 63.000 7 OSL 12 23.40 67.000 7 OSL 13 29.00 70.000 9 OSL 14 39.80 78.000 8 OSL 15 45.6 80 000 8 OSL 16 49.20 83.000 9 17 65.2 97.000 11 OSL 18 78.0 107.000 11 OSL 19 88.0 67.000 9 OSL
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表 3 HDQ2孔地震反射界面深度、年龄、沉积速率和古水深
Table 3. The age, depth, sediment rate and water depth of seismic reflectors at Core HDQ2
反射界面 深度/mbsb 年代/kaBP 沉积速率/(m/ka) 古水深/m R1 6.4 40.7 0.16 -72 R2 11.2 49.9 0.52 -47 R3 24.8 66.7 0.93 -68 R4 38.4 78.1 1.20 -44 R5 58.4 90.9 1.57 -32 R7 76.0 100.1 1.91 -37
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