| 元素地球化学特征在识别碳酸盐岩层序界面中的应用——以冀北坳陷中元古界高于庄组为例 |
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| 引用本文： | 罗顺社,汪凯明.元素地球化学特征在识别碳酸盐岩层序界面中的应用——以冀北坳陷中元古界高于庄组为例[J].中国地质,2010,37(2):430-437. |
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| 作者姓名： | 罗顺社 汪凯明 |
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| 作者单位： | 长江大学油气资源与勘探技术教育部重点实验室,湖北,荆州,434023;长江大学地球科学学院,湖北,荆州,434023 |
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| 基金项目： | 中国石油化工股份有限公司海相油气勘探前瞻性项目 |
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| 摘 要： | 元素是组成岩石矿物的基本单元,它们对环境的变化极为敏感。地层中元素的分配及比值变化、组合都在一定程度上纪录着古沉积环境的演化历程,这些对恢复古沉积环境,研究海相碳酸盐古盐度、海平面相对变化具有重要的指示意义。利用元素地球化学特征对冀北坳陷中元古界高于庄组层序地层单元进行研究,发现在古气候的影响下,古盐度、相对海平面变化与碳酸盐中的元素含量及有关元素比值呈现明显的旋回变化特征。其中Sr/Ba比值法与硼法判别精度相对较高,可以作为识别和划分碳酸盐岩层序界面的有效标志。
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| 关 键 词： | 元素地球化学 古盐度 碳酸盐岩 层序界面 高于庄组 中元古界:冀北坳陷 |
The application of element geochemical characteristics to the recognition of carbonate sedimentary sequence boundary: A case study of the Mesoproterozoic Gaoyuzhuang Formation in northern Hebei depression |
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| LUO Shun-she,WANG Kai-ming.The application of element geochemical characteristics to the recognition of carbonate sedimentary sequence boundary: A case study of the Mesoproterozoic Gaoyuzhuang Formation in northern Hebei depression[J].Chinese Geology,2010,37(2):430-437. |
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| Authors: | LUO Shun-she WANG Kai-ming |
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| Abstract: | Elements constitute the basic units of mineral rocks. They are sensitive to environmental changes. The characteristics of elements such as distribution,ratio and combination have recorded the information of environmental change during the evolution of sedimentary strata. These data are of important indicating significance in reconstructing sedimentary environment and studying the paleosalinity of marine carbonate rocks and the relative sea level change. The authors studied the sequence stratigraphic units of the Gaoyuzhuang Formation based on the element geochemical characteristics. The results show that, under the palaeoclimate influence, the paleosalinity, the relative sea level change and the element content in the carbonate as well as the related element ratios show obvious cyclic change characteristics. The methods of Sr/Ba and B have relatively high precision,which can serve as effective means for identifying and dividing the carbonate sequence boundary. |
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| Keywords: | element geochemistry paleosalinity carbonate sequence boundary Gaoyuzhuang Formation Mesoproterozoic northern Hebei depression |
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