吉林大学学报(地球科学版) ›› 2017, Vol. 47 ›› Issue (2): 355-369.doi: 10.13278/j.cnki.jjuese.201702103
高福红1, 张永胜1, 蒲秀刚2, 杨杨3, 张鐘月4
Gao Fuhong1, Zhang Yongsheng1, Pu Xiugang2, Yang Yang3, Zhang Zhongyue4
摘要: 通过镜下鉴定和地球化学分析对歧口凹陷古近系沙一段白云岩进行了研究,综合分析了研究区发育的岩石类型及其成因。结果表明:研究区发育泥-微晶白云岩、灰质白云岩、白云质灰岩及少量颗粒白云岩;Sr/Ba值为0.4~4.9,V/Ni值为1.3~7.1,Z值(盐度指数)分布在122.6~162.5;87Sr/86Sr值和同期海水极为接近,因此推断湖盆遭受了海侵作用,海侵为白云岩化作用提供了Mg2+;有序度分布在0.22~0.53,整体较低;Mg/Ca值为0.73~0.91,反映了富钙低镁的特征,表明白云岩形成于准同生阶段。碳氧同位素分析表明,研究区白云岩形成于浅埋藏环境,并且受到了发酵作用的影响,异常高的Sr值也反映了微生物活动的存在。通过以上证据推断本区白云岩是在准同生期、浅埋藏环境、经渗透回流作用形成的,并且受到了发酵作用的影响。
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