The Geochemistry Records of Sea-Level Relative Movement and Paleoclimatic Evolution of the South China Continental Margin in Late Triassic-Early-Middle Jurassic
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摘要: 晚三叠-中侏罗世华南陆缘发生多期海侵-海退旋回.元素地球化学特征指示的古盐度高低和古水深深浅记录了海平面的相对升降.华南陆缘存在3个级别的海平面变化.其中, Ⅲ级海平面波动频繁, 由晚三叠世3次波动、早侏罗世4次波动和早、中侏罗世2次波动构成了此间大规模海侵-海退旋回.华南陆缘Ⅰ级海平面相对升降曲线与全球海平面长周期曲线, 在诺利克阶早期-辛涅缪尔阶晚期变化同步, 在辛涅缪尔阶晚期-阿连阶变化相悖.Ⅲ级海平面相对升降曲线与全球海平面短周期曲线, 在瑞替阶-辛涅缪尔阶晚期同发生4次波动, 时间上近乎同步.Sr/Cu值指示的元素迁移与富集反映了气候的温湿与干热.粤中-粤东地区晚三叠-早、中侏罗世经历了温湿-干热-温湿的气候变化.Abstract: The margin of South China in Late Triassic-Middle Jurassic had undergone multi transgression-regression cycles. The element geochemistry character indicates the paleosalinity and the water depth records the relative movements of the sea level. There are three levels of sea level change in the margin of South China. The grade III sea-level fluctuated frequently. There were 3 times in Late Triassic, 4 times in Early Jurassic and 2 times in Early or Middle Jurassic. These fluctuations constituted a large-scale transgression-regression cycle. The relative movements curve of the grade I sea-level is synchronous with the change of the long-period global sea-level curve in early Norian-late Sinemurian of the margin of South China. But it is contrary in late Sinemurian-Aalenian. The relative movements curve of the grade III sea-level and the short-period global sea-level curve occurred 4 fluctuations in Rhaetian-late Sinemurian. And they were almost simultaneously in time. The element migration and enrichment which were indicated by Sr/Cu reflected the warm-humid and dry-heat of the climate. The area of Middle Guangdong-East Guangdong in Late Triassic-Early-Middle Jurassic undergone the climate change of warm-humid to dry-heat and to warm-humid.
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Key words:
- the margin of South China /
- Early Mesozoic /
- sea-level change /
- paleoclimate /
- geochemistry /
- marine geology
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图 1 粤中-粤东地区地质略图及剖面位置(据舒良树等, 2004)
Fig. 1. The geological sketch map and profile location of the area in Middle Guangdong-East Guangdong
图 2 晚三叠-早、中侏罗世华南陆缘古盐度变化、古水深变化和海平面相对升降曲线
Fig. 2. The curves of the paleosalinity change, the water depth change and the sea-level relative movement of South China continental margin in Late Triassic-Early-Middle Jurassic
图 3 华南陆缘海平面相对升降曲线与全球海平面升降曲线对比
Fig. 3. The comparison of the sea-level relative movement curve in South China continental margin and the global sea-level movement curve
表 1 晚三叠-早、中侏罗世典型剖面常量、微量元素比值
Table 1. Content and element ratio of the typical profile in Late Triassic-Early-Middle Jurassic
时代 层位 样品号 岩性 m=100×MgO/Al2O3 Ca/Mg Sr/Ba B/Ga Sr/Cu 晚三叠世 小坪组凤岗段 FG-1 泥岩 2.96 1.75 0.04 1.56 2.43 FG-2 泥岩 3.69 0.97 0.04 1.45 2.48 FG-3 泥岩 3.00 0.58 0.04 1.44 2.78 FG-4 泥岩 2.83 0.95 0.04 1.52 0.83 FG-8 泥岩 6.19 1.17 0.19 1.31 14.76 FG-9 泥岩 6.88 0.66 0.19 1.42 11.89 FG-10 泥岩 4.78 0.85 0.15 0.83 21.30 FG-11 泥岩 2.46 0.39 0.13 1.98 2.73 小坪组马鞍段 MA-18 泥岩 3.32 1.27 0.26 3.72 13.27 MA-19 泥岩 3.38 0.46 0.26 2.92 12.72 MA-23 泥岩 3.91 0.33 0.06 1.43 8.41 早侏罗世 银瓶山组 HF-20 泥岩 1.43 0.24 0.15 6.46 75.29 HF-19 泥岩 1.56 0.79 0.22 11.51 7.29 HF-4 泥岩 1.77 0.30 0.23 4.53 9.03 上龙水组 HF-3 泥岩 1.19 0.16 0.28 — 34.95 HF-2 泥岩 1.66 0.65 0.25 4.76 16.68 HF-1 泥岩 1.49 0.19 0.20 4.36 8.80 HF-38 泥岩 1.71 0.41 0.20 4.55 7.07 HF-37 泥岩 2.06 0.24 0.16 — 3.65 长埔组 HF-31 泥岩 1.92 0.14 0.09 7.44 5.20 HF-26 泥岩 2.21 0.09 0.13 8.96 13.15 吉水门组 HF-25 泥岩 1.60 0.14 0.16 4.04 3.48 青坑村组 QK-2 泥岩 2.52 0.20 0.10 3.23 11.35 QK-3 泥岩 3.40 0.13 0.11 4.30 10.16 QK-4 泥岩 3.13 0.08 0.08 3.19 2.63 早-中侏罗世 桥源组 KT-8 粉砂质泥岩 5.72 0.08 0.08 4.92 2.18 KT-1 粉砂质泥岩 3.33 0.37 0.04 2.93 3.07 KT-2 粉砂质泥岩 2.99 0.33 0.06 2.18 1.62 KT-3 粉砂质泥岩 7.56 0.07 0.07 1.46 0.43 KT-4 粉砂质泥岩 8.65 0.13 0.05 2.31 0.74 KT-5 粉砂质泥岩 1.87 0.30 0.19 1.56 0.82 KT-6 粉砂质泥岩 4.13 0.39 0.11 2.97 7.81 KT-11 粉砂质泥岩 4.09 0.13 0.06 3.96 0.72 注: 样品由吉林大学实验测试中心完成.常量元素用X射线荧光光谱仪测定；微量稀土元素用ICPMS质谱仪测定.“—”为B元素未检测出数据, 未得出计算结果. 
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