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为了探讨渤海湾西岸全新世地层的古环境,本文进行了多种地球化学环境指标的分析,在此,将指示不同环境的指标进行了分项(或归类)如:古气候、氧化-还原、海-陆相环境指标等;并将其分别进行R型聚类分析和散点分析(获得了元素指标的相关系数及聚散特征)。具体分析结果为:①古气候指标:如图2所示,古温度值与Rb/Sr比值呈正相关关系,相关系数为+0.927,而CaCO3含量与古温度值、Rb/Sr比值二项指标则呈较大的负相关关系,相关系数为-0.721,表明CaCO3较高含量的寒冷期时而古温度值的负值也往往随之变大。②氧化-还原指标:如图4,显示出了Fe2+/Fe3+比值与Corg/P2O5比值有较大的聚敛性。③海-陆相指标:如图5所示,Sr/Ba比值与B/Ga比值呈正相关关系,相关系数为+0.946,而Ca/(Ca+Fe)比值与Sr/Ba比值、B/Ga比值二项指标也显示出了较大的正相关性,相关系数为+0.894;而B的古盐度SP值和Rb/K比值此二项指标与Sr/Ba比值、B/Ga比值?Ca/(Ca+Fe)比值等这三项指标呈负相关关系,相关系数分别为-0.792及-0.632。④通过最优分割分析(按照本文中一定的“方法原则”)以及统计分析,划分出了:第Ⅰ-第Ⅴ气候冷段、第Ⅰ-第Ⅴ还原带、及其海平面升降波动曲线:第Ⅰ-第Ⅶ段),如图3显示出大致的规律为:气候冷期时往往处于还原环境,与此同时,海平面则呈波动下降趋势。
In order to explore the paleoenvironment of the Holocene strata in the west coast of the Bohai Bay, a series of analyzes of various geochemical environmental indicators were conducted in this paper. In this paper, indicators indicating different environments were subdivided (or classified) into: paleoclimate, oxidation-reduction , Marine-terrestrial environmental indicators, etc. and carry out R-type cluster analysis and scatter analysis respectively (obtained the correlation coefficient and polygamy characteristic of the element indexes). The results of the analysis are as follows: (1) Paleoclimate indicators: As shown in Fig. 2, the palaeoclimatic temperature has a positive correlation with Rb / Sr ratio with a correlation coefficient of +0.927, while the CaCO3 content, palaeoclimate and Rb / Sr binomial Showed a large negative correlation, the correlation coefficient of -0.721, indicating that the higher the content of CaCO3, while the paleo-paleo-temperature values tend to become larger. ② Oxidation-reduction index: As shown in Fig. 4, it shows that the ratio of Fe2 + / Fe3 + has a great convergence with the ratio of Corg / P2O5. ③ Marine-continental index: As shown in Fig. 5, the Sr / Ba ratio has a positive correlation with the B / Ga ratio with a correlation coefficient of +0.946. The ratio of Ca / (Ca + Fe) to Sr / Ba, B / Ga The binomial index of the ratio also showed a larger positive correlation with a correlation coefficient of +0.894; while the paleosalinity SP value and the Rb / K ratio of B had the ratio of these two indicators to Sr / Ba ratio, B / Ga ratio? Ca / (Ca + Fe) ratio of these three indicators was negative correlation, the correlation coefficient was -0.792 and -0.632. (4) Through the optimal segmentation analysis (according to certain “principle of the method” in this article) and statistical analysis, it is divided into the first-Ⅴ Ⅴ climatic cold section, Ⅰ-Ⅴ Ⅴ reduction zone, and the sea level fluctuation Curves: Section I-VII), as shown in Figure 3, the general rule is that when the climate is cold, it tends to be in a reducing environment, meanwhile, the sea level tends to fluctuate downward.