Boundary definition of Wufeng Formation and Longmaxi Formation in well DD1 and sedimentary environment evolution of Northeastern Yunnan
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摘要:
DD1井上奥陶统临湘组泥灰岩之上发育大套粉砂质泥岩，笔石化石缺乏，也未发现观音桥段含赫南特贝灰岩标志层，O-S界线通过生物地层和岩石地层方法难以确定。微量、稀土元素分析表明，粉砂质泥岩中部（1288.3 m）的Th、Sr、Y、Th/U以及Cen、Eun、δCe、δEu曲线均呈现尖锐的异常峰，该处∑REE含量显著高于上下地层，REE分布曲线右倾斜率更大。将DD1井与扬子地区其他O-S界线剖面的元素地球化学特征进行对比分析，可判断DD1井存在五峰组观音桥段，该标志层的厚度也小于1 m。微量元素地球化学氧化-还原判别图还表明，五峰期-龙马溪期早期沉积水介质主要处于弱氧化环境，观音桥期氧化性达到最强；根据沉积学标志分析，O-S之交沉积相演变过程为：潮下→潮间→潮上→潮间，在观音桥期水体最浅，为潮上带沉积。
Abstract:Although the Upper Ordovician Linxiang Formation marl in DD1 well is covered with thick silty mudstone, there is a lack of graptolite fossil, and no Hirnantia limestone marker stratum of the Guanyinqiao Member. Therefore, it is difficult to determine the boundary between Ordovician System and Silurian System by biostratigraphic and petrostratigraphic methods. The analysis of trace elements and REE of silty mudstone in the well DD1 shows that Th, Sr, Y, Th/U, Cen, Eun, δCe and δEu curves at the middle part of silty mudstone (1288.3m) present sharp abnormal peaks with significantly higher ΣREE content of silty mudstone (1288.3m) than its upper and lower silty mudstone and great right slope of the REE distribution curve. By comparing the elemental geochemistry characteristics of the well DD1 with other O-S boundary in the Yangtze Region, it can be concluded that there exists Guanyinqiao Member of Wufeng Formation in the well DD1, and the thickness of this marker layer is also less than 1 m. The geochemical redox discriminant graph shows that the sedimentary water medium mainly was in weak oxidation environment from the Wufeng period to the early Longmaxi period, and its oxidation was the strongest in the Guanyinqiao period. According to the analysis of sedimentary markers, the evolution process of the sedimentary facies at the O-S transition is as follows:subtidal → intertidal → supertidal → intertidal; in the Guanyinqiao period, the water was the shallowest, and there existed supertidal deposits.
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表 1 DD1井部分代表性样品主量、微量和稀土元素含量及比值（主量元素单位为%；其他元素为μg/g）
Table 1. Contents and ratios of trace elements, REE(μg/g) and major elements(%)in some samples of well DD1
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