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总有机碳(TOC)是直接表征古生产力状况的传统指标,但是,TOC并不仅仅受到初始有机质输入量的控制,还可能受到氧化-还原环境和陆源碎屑物输入状况的影响.本文采用元素地球化学指标评价了冀浅1井洪水庄组氧化-还原环境和古生产力状况,进而探讨了埋藏有机碳与古生产力的相关性.碳-硫关系,V/Cr和Mo含量表明,洪水庄组白云岩形成于氧化环境,大部分黑色页岩形成于静海环境.洪水庄组沉积物中P/Ti可类比于被认为是中等-高生产力的日本Ubara二叠-三叠系剖面的P/Ti,Ba/Al仅略低于被认为是高生产力的中加利福尼亚大陆边缘薄层沉积物的Ba/Al,表明洪水庄组沉积期古生产力状况为中等-高.洪水庄组沉积物埋藏有机碳含量与氧化还原环境指标(V/Cr和Mo含量)呈正相关,与反映古生产力的参数(P/Ti和Ba/Al)呈弱或无直接相关性,说明洪水庄组沉积期虽然总体生产力水平较高,但埋藏有机碳含量主要受控于氧化-还原环境,与古生产力之间无直接关系.
Total organic carbon (TOC) is a traditional indicator of the paleo-productivity directly, however, TOC is not only controlled by the input of initial organic matter but also affected by the input of oxidation-reduction environment and terrigenous debris. In this paper, Geochemical indicators evaluated the oxidation-reduction environment and paleoproductivity of the Hongshuizhuang Formation in Ji-Sha I well, and then discussed the correlation between burial organic carbon and paleoproductivity. The carbon-sulfur relationship, V / Cr and Mo contents indicate that the Hongshuangzhuang Formation The dolomite is formed in an oxidizing environment and most of the black shale is formed in a calm sea environment. P / Ti in the sediments of the Hongshuizhuang Formation can be compared with the P / Ti ratio of the Ubara Permian-Triassic series in Japan, which is considered to be moderate to high productivity , Ba / Al is only slightly lower than that of Ba / Al, which is considered to be a high productivity thin-layer deposit on the margin of the Central California, indicating that the paleocontinental productivity during the depositional period of the Hongshuizhuang Formation was medium-high. (P / Ti and Ba / Al) were positively correlated with the redox environment index (V / Cr and Mo content), and weak or no correlation with P / Ti and Ba / Al parameters, indicating that although the overall productivity of the Hongshuizhuang Formation was High, but buried The organic carbon content is mainly controlled by the oxidation-reduction environment and has no direct relationship with the paleo-productivity.