Paleoenvironmental reconstruction of organic-rich shale in the Hetang Formation of the Lower Yangtze Block: a case study of Well XY1
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摘要:
元素地球化学特征可以有效地反映沉积物沉积背景与沉积环境。以宣城地区宣页1井（下称XY1井）下寒武统荷塘组富有机质页岩为例，利用元素地球化学指标，对下扬子地块宣城地区荷塘组富有机质页岩的构造背景与沉积环境进行了分析。结果显示，荷塘组富有机质页岩属于温暖潮湿气候背景下的稳定大陆边缘沉积，为缺氧-贫氧的海相环境，水体具有较高生产力。综合古环境参数恢复结果认为，荷塘组富有机质页岩为深水滞留沉积的产物，水体深度先加深后变浅。
Abstract:The sedimentary background and environment can be studied effectively through the element geochemical characteristics. Taking the organic-rich shale of the Lower Cambrian Hetang Formation in XY1 in Xuancheng Area as an example, the structural background and sedimentary environment of the organic-rich shale of the Hetang Formation in Xuancheng area of the Lower Yangtze block were analyzed by using the element geochemical indexes. The results show that: the organic-rich shales were deposited in a stable continental margin under warm and humid climate, and the marine environment was anoxic to oxygen poor. The water body was highly productive. The paleoenvironmental parameters indicate that organic-rich shale of Hetang Formation is of continental slope facies deposited in deep water, and the water depth deepened first and then shallowed.
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Key words:
- element geochemistry /
- Lower Yangtze Block /
- Hetang Formation /
- organic-rich shale /
- paleoenvironment
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表 1 荷塘组富有机质页岩主量、微量元素分析结果
Table 1. Results of analyses of major and trace elements in organic-rich shale of Hetang Formation
编号 X-1 X-2 X-3 X-4 X-5 X-6 X-7 X-8 X-9 X-10 X-11 X-12 主量元素 K2O 5.23 4.96 5.00 6.17 5.50 5.46 4.47 5.44 5.44 6.28 6.42 5.26 Na2O 0.08 0.075 0.069 0.084 0.063 0.06 0.048 0.057 0.055 0.067 0.18 0.061 SiO2 69.84 71.64 70.98 64.97 71.00 68.16 74.74 72.9 74.21 70.72 62.07 72.9 Al2O3 9.12 9.00 9.26 11.25 10.25 10.06 8.21 10.83 10.53 12.44 14.51 10.8 微量元素 Sr 21.1 16.4 22.8 19.8 31.1 40.9 32.9 30.3 25.8 24.5 43.0 19.2 Cu 83.1 52.8 37.5 610 40.3 66.7 21.9 28.4 36.3 29.9 144 30.4 Ni 90.4 81.7 61.0 104 41.6 68.4 44.4 77.7 81.3 71.4 102 68.1 V 208 162 146 280 77.1 91.5 192 368 277 287 372 424 Cr 51.4 45.1 45.1 62.4 47.3 47.2 42.7 59.5 57.4 66.8 73.6 66.4 Th 9.58 10.6 8.71 12.5 10.27 10.6 8.39 10.39 10.24 11.7 14.3 9.31 U 8.84 18.1 12.6 10.5 8.41 7.38 7.99 8.69 7.62 7.86 11.0 10.2 Mo 31.1 62.2 36.9 40.7 21.2 20.6 33.9 27.8 29.2 32.8 50.9 51.1 Ba 17825 5550 6722 19957 4679 4745 3561 3942 4042 4689 15573 6639 Co 50.95 111.14 25.48 69.64 27.31 38.15 44.66 25.25 29.45 20.43 50.03 29.24 La 25.10 31.69 20.16 50.85 26.87 27.30 15.36 13.16 21.02 22.31 22.94 26.55 数据处理 V/Cr 0.28 0.29 0.34 0.26 0.40 0.36 0.24 0.31 0.26 0.24 0.22 0.20 MoEF 20.70 41.50 24.62 27.15 14.15 13.70 22.60 18.54 19.45 21.85 33.93 34.04 UEF 0.10 0.10 0.12 0.09 0.14 0.13 0.08 0.11 0.09 0.09 0.08 0.07 V/（V+Ni） 0.22 0.23 0.25 0.20 0.28 0.26 0.19 0.24 0.21 0.19 0.18 0.17 K2O/Na2O 65.38 66.1 72.5 73.5 87.30 91.00 93.13 95.44 98.91 93.73 35.7 86.2 SIO2/Al2O3 7.66 7.96 7.67 5.78 6.93 6.78 9.10 6.73 7.05 5.68 4.28 6.75 Th/U 1.08 0.59 0.69 1.20 1.22 1.43 1.05 1.20 1.34 1.49 1.30 0.91 Ba生物 16087 3835 4957 17813 2726 2828 1997 1878 2035 2318 12808 4581 t 0.64 0.81 0.52 1.30 0.69 0.70 0.39 0.34 0.54 0.57 0.59 0.68 H 125.18 55.90 260.14 94.44 249.18 172.04 140.12 253.46 222.80 337.99 126.91 230.30 注：主量元素单位为%；微量元素单位为10−6；H单位为m。 
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