Evolutional Characteristics and Their Paleoclimate Significance of Trace Elements in the Hetaoyuan Formation, Biyang Depression
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摘要: 泌阳凹陷下第三系核桃园组总体上表现为一个大的湖退体系,而其中的微量元素含量及有关元素比值却呈现出细微而明显的旋回变化特征。本文依据泥岩、页岩和碳酸盐岩中Ti、Sr、Ba等十六种微量元素含量及Sr/Ba、Fe/Mn、Sr/Cu等七种比值的变化特征,结合古盐度及岩相资料,对核桃园组沉积时的古气候作了系统的研究,基本上分出了温暖潮湿、干湿交替、炎热干旱、温热半干旱四类较为特征的古气候类型,以期为油气勘探提供依据。Abstract: he Hetaoyuan Formation in the Tertiary Biyang depression is completely a lacustrine regressives ys tem,but it has some microcyclic variations in microfacies during evolution. These characteristics canbe shown obviously from the abundance of trace elements and their ratios. Based on variation charactersof contents of 16 trace elements such as Ti,Sr, Nb, Ba, etc.and 7 trace elements ratios such as Sr/Ba,Fe /M n, M g / Ca,etc·obtained from mudstones, shales and carbonates, and in terms of some data suchas paleosalinity and lithofacies, this paper made a systematical study of paleodimate under which theHetaoyuan Formation was deposited. As a result, four characteristic paleoclimate types can be grouped,i. e.,temperate-humid, dry一umid alternation, hot-dry and humid-emiarid. It is hoped that this result can provide some clues for the petroleum and gas exploration in the Biyang depression.
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Key words:
- trace element /
- abundance /
- paleoclimate /
- Biyang depression
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