摘要
通过对野外剖面的观察和测量,根据剖面岩性及古生物等相标志,结合室内薄片资料的研究,认为燕山地区宣龙坳陷中元古界高于庄组—雾迷山组主要发育一套海相碳酸盐岩,局部夹少量海相碎屑岩,韵律性和旋回性明显,叠层石形态丰富,可划分为海相碳酸盐岩台地和生物礁2个相带,进一步可细分为潮坪和障积-黏结礁2种亚相以及潮上带、潮间带、潮下带和障积-黏结岩4种微相,其中以潮汐作用控制的碳酸盐岩潮坪亚相为主,障积-黏结礁亚相仅在研究区高于庄组九、十段发育。建立了研究区高于庄组和雾迷山组的碳酸盐岩沉积模式。通过对微量元素(V、Rb、Sr、Ba、Be、B)和常量元素(Al、Si、Fe、Mg、Ca、K、Mn、P)分析结果按不同相带进行的统计认为,研究区碳酸盐岩地球化学特征与原始沉积环境有着极为密切的关系,可作为沉积环境判别的有效标志。
Based on observation of field profiles, study of facies markers in rock profiles and paleontology, and analysis of geochemical data, it is suggested that in Yanshan area, Mesoproterozoic Gaoyuzhuang and Wumishan Formations are a set of marine carbonate rock bedded locally with marine clastic rock,in which there are obvious rhythms and cycles and various stromatolite structures. The formations can be divided into carbonate terrace facies and biohermal facies, and can be further subdivided into tidal flat and baffle-bond reef subfacies and into four microfacies： supratidal zone, intertidal zone, subtidal zone and baffle-bond reef. Among these subfacies, the carbonate tidal flat subfacies is dominat- ed and baffle-bond reef subfacies only develops in the 9th and 10th Members of Gaoyuzhnang Formation. A sedimen- tation model of carbonate rock is established. Through statistical analysis on trace elements （V, Rb, Sr, Ba, Be and B） and invariable elements （Al, Si, Fe, Mg, Ca, K, Mn and P） in different sedimentary environments, it is shown that geochemical features of the carbonate rock are closely related with primary sedimentary environment in this area, which can be used as the effective mark to identify sedimentary environments.
出处
《海相油气地质》
2011年第4期57-61,共5页
Marine Origin Petroleum Geology
