| 山东即墨地区下白垩统灰岩地球化学特征及沉积环境分析 |
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| 引用本文： | 李曼洁,周瑶琪,周腾飞,辜洋建,曹梦春.山东即墨地区下白垩统灰岩地球化学特征及沉积环境分析[J].地质与资源,2020,29(2):126-134,125. |
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| 作者姓名： | 李曼洁 周瑶琪 周腾飞 辜洋建 曹梦春 |
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| 作者单位： | 1. 中国石油大学(华东) 地球科学与技术学院, 山东 青岛 266580;2. 深地资源勘查理论与技术协同创新中心, 山东 青岛 266580 |
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| 基金项目： | 2017年度山东省重大科技创新工程项目“山东东部海域日青威盆地油气赋存条件研究”(编号2017CXGC1608)资助. |
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| 摘 要： | 为研究山东即墨周戈庄剖面下白垩统灰岩地球化学特征及沉积环境，对周戈庄剖面灰岩进行了系统的沉积学和元素地球化学测试.研究结果显示，周戈庄剖面灰岩样品中SiO2和CaO含量较高，其平均含量分别为17.18%和39.10%，且SiO2、Al2O3与CaO的值呈现负相关，表明灰岩沉积时期受陆源影响较大.微量元素中，Zr含量较低，Ti含量远大于碳酸盐岩中平均含量，表明其沉积作用主要受陆源影响.稀土总量丰富，重稀土富集，Gd和Eu显示轻微正异常，Ce轻微负异常，且Ce/Ce*与Eu/Eu*、ΣREE呈明显的相关性.MgO/Al2O3为0.33～0.74，Sr/Ba值为0.10～0.94，反映了陆相沉积环境.V/Cr值为1.64～1.92，Ni/Co值为1.83～2.45， U/Th值为0.48～0.84，反映了氧化沉积特征.MgO/CaO的值为0.03～0.14，Sr/Cu值为16.46～20.45，指示了干旱炎热的气候条件，表明周戈庄剖面灰岩沉积环境为炎热干旱的氧化陆相沉积环境.对周戈庄地区沉积环境的研究可以用来重建古气候、恢复古环境.
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| 关 键 词： | 灰岩 下白垩统 地球化学 沉积环境 山东省 |
| 收稿时间： | 2019-05-29 |
ANALYSIS ON THE GEOCHEMICAL CHARACTERISTICS AND SEDIMENTARY ENVIRONMENT OF THE LOWER CRETACEOUS LIMESTONE IN JIMO AREA,SHANDONG PROVINCE |
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| LI Man-jie,ZHOU Yao-qi,ZHOU Teng-fei,GU Yang-jian,CAO Meng-chun.ANALYSIS ON THE GEOCHEMICAL CHARACTERISTICS AND SEDIMENTARY ENVIRONMENT OF THE LOWER CRETACEOUS LIMESTONE IN JIMO AREA,SHANDONG PROVINCE[J].Geology and Resources,2020,29(2):126-134,125. |
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| Authors: | LI Man-jie ZHOU Yao-qi ZHOU Teng-fei GU Yang-jian CAO Meng-chun |
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| Institution: | 1. School of Geosciences, China University of Petroleum(East China), Qingdao 266580, Shandong Province, China;2. Deep Resources Exploration Theory and Technology Collaborative Innovation Center, Qingdao 266580, Shandong Province, China |
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| Abstract: | In order to study the geochemical characteristics and sedimentary environment of the Lower Cretaceous limestone at Zhougezhuang section in Jimo,Shandong,the authors carry out systematic sedimentological and elemental geochemical tests on the limestone.The results show that the contents of SiO2 and CaO in the limestone samples are high,with average contents of 16.83%and 39.34%,respectively,and the values of SiO2 and Al2O3 are negatively correlated with that of CaO,suggesting that the sedimentation of limestone be notably influenced by terrigenous sources.Among the trace elements,the Zr content is low,while the Ti content is much greater than the average in carbonate rock,indicating that the sedimentation is mainly terrigenous matters.The total amount of rare earth elements is rich,with enriched HREE,slightly positive anomalies of Gd and Eu,and less negative anomaly of Ce.The ratio of Ce/Ce*is significantly correlated with Eu/Eu*and∑REE.The MgO/Al2O3 values range from 0.33 to 0.74,with Sr/Ba of 0.10-0.94,which reflects the continental depositional environment.The V/Cr value of 1.64-1.92,Ni/Co value of 1.83-2.45 and U/Th value of 0.48-0.84 represent the characteristics of oxidation deposition.The MgO/CaO value of 0.03-0.14 and Sr/Cu value of 16.46-20.45 indicate an arid and hot climatic condition.Therefore,the limestone of Zhougezhuang section shows a hot and dry oxidized continental facies sedimentary environment,which can be used to reconstruct and restore the paleoclimate. |
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| Keywords: | limestone Lower Cretaceous geochemistry sedimentary environment Shandong Province |
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