0 引言
1 地质背景
2 元素地球化学特征与沉积环境
2.1 古氧化还原环境
表1 沉积水体氧化还原环境的地球化学判识指标Table 1 Geochemical identification signs of redox environment in sedimentary water |
2.1.1 深水陆棚区
图2 四川盆地不同地区筇竹寺组氧化—还原地球化学指标交会图((a)—(e))(数据引自文献[1,12,15,19,44,53-55)及N208井筇竹寺组MoEF—UEF协变图(f)(图版改自文献[60],数据引自文献[55])Fig.2 Plots of oxidation-reduction indexes of Qiongzhusi Formation in the Sichuan Basin [(a)-(e)] (data sourced from Refs.[1, 12, 15, 19, 44, 53-55]) and MoEF versus UEF covariation in Qiongzhusi Formation for Well N208 (f) (plate modified from Ref.[60], data sourced from Ref.[55]) |
图3 四川盆地德阳—安岳裂陷槽北段—裂陷槽中段—裂陷槽南段筇竹寺期沉积水体氧化还原环境对比(数据引自文献[12,44,56-57])Fig.3 Comparison of redox environments in sedimentary water bodies during the Qiongzhusi period from the northern to the middle and the south section of the Deyang-Anyue rift in the Sichuan Basin (data cited from Refs.[12, 44, 56-57]) |
图4 川东北浅水陆棚—裂陷槽中段—裂陷槽南段筇竹寺期沉积水体氧化还原环境对比(数据引自文献[1,3,12,17,19])Fig.4 Comparison of redox environment of sedimentary water of Qiongzhusi period from the shallow water shelf area in northeastern Sichuan Basin to the middle section and the south section of the Deyang-Anyue rift in the Sichuan Basin (data sourced from Refs.[1,3,12,17,19]) |

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