| 高分辨率化学层序地层学在深水细粒沉积中的应用:以上扬子地区六塘露头五峰组—龙马溪组下段为例 |
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| 引用本文： | 王茜,黄永建,张治锋,王长红,李祥,刘伟.高分辨率化学层序地层学在深水细粒沉积中的应用:以上扬子地区六塘露头五峰组—龙马溪组下段为例[J].现代地质,2021,35(1):281-292. |
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| 作者姓名： | 王茜 黄永建 张治锋 王长红 李祥 刘伟 |
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| 作者单位： | 1. 中国地质大学(北京) 地球科学与资源学院,北京 1000832. 中国地质调查局 成都地质调查中心,四川 成都 610082 |
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| 基金项目： | 中国地质调查局成都地质调查中心委托项目(12120115004401-04);国家科技重大专项项目(2016ZX05029-001)。 |
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| 摘 要： | 综合化学地层学、层序地层学的理论和方法,利用重庆石柱县六塘露头实测资料及样品分析测试资料,优选出陆源输入强度相关元素组合Al-K-Ti-Rb-Cr-Zr、自生沉淀强度相关元素组合Ca-Mn-Mg-Ba-Zn、有机质吸附及还原强度相关元素组合V-Ni-Mo-U-As作为化学层序地层划分指标体系,将六塘露头五峰组划分为LCW层序,龙马溪组下段自下而上细分为MCL1-1、MCL1-2、MCL1-3、MCL1-4层序。陆源输入强度相关主量、微量元素组合总量在层序界面附近相对较高,而在最大海泛面附近相对较低,具有元素总量减少→增加的旋回性变化特征;而自生沉淀强度相关主量元素组合总量和微量元素组合总量、有机质吸附及还原强度相关微量元素组合总量在层序界面附近一般较低,在最大海泛面附近一般较高,具元素总量增多→减少的旋回性变化特征。这种不同成因意义的元素组合总量旋回性变化是区域海平面变化的响应,具有区域一致性,可作为区域地层对比依据。
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| 关 键 词： | 上扬子地区 六塘露头 五峰组 龙马溪组 化学层序地层学 |
| 收稿时间： | 2020-07-16 |
| 修稿时间： | 2020-08-25 |
Application of High-resolution Chemical Sequence Stratigraphy to Deep-water Fine-grained Sediments:A Case Study of Wufeng Formation and Lower Member of Longmaxi Formation in Liutang Outcrop,Upper Yangtze Area |
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| WANG Qian,HUANG Yongjian,ZHANG Zhifeng,WANG Changhong,LI Xiang,LIU Wei.Application of High-resolution Chemical Sequence Stratigraphy to Deep-water Fine-grained Sediments:A Case Study of Wufeng Formation and Lower Member of Longmaxi Formation in Liutang Outcrop,Upper Yangtze Area[J].Geoscience——Journal of Graduate School,China University of Geosciences,2021,35(1):281-292. |
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| Authors: | WANG Qian HUANG Yongjian ZHANG Zhifeng WANG Changhong LI Xiang LIU Wei |
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| Institution: | 1. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083,China2. Chengdu Center, China Geological Survey, Chengdu, Sichuan 610082,China |
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| Abstract: | Based on the theories and methods of chemical stratigraphy and sequence stratigraphy,the data of Liutang outcrop profile and sample analysis and test in Shizhu County of Chongqing are used to optimize the indicators system for the chemical sequence stratigraphic division which are the elements assemblages of Al-K-Ti-Rb-Cr-Zr,related to input intensity of terrigenous,the elements assemblages of Ca-Mn-Mg-Ba-Zn,related to autogenetic precipitation intensity,and the elements assemblages of V-Ni-Mo-U-As related to organic matter adsorption and deoxidation intensity.The Wufeng Formation of Liutang outcrop is divided into LCW sequence,and the lower part of Longmaxi Formation is divided into MCL1-1,MCL1-2,MCL1-3,MCL1-4 sequences upwardly.The total amount of major and trace element combinations related to the input intensity of terrigenous source is relatively high near the sequence boundary,but relatively low near the most oceanic flooding surface,which has the cyclic changes characteristics of decreasing-increasing of total elements.However,the total amount of major and trace element assemblages related to autogenetic precipitation,organic matter adsorption and deoxidation intensity are generally lower near the sequence boundary and higher near the maximum flooding surface,which has the cyclic changes characteristics of increasing-decreasing the total amount of elements.The cyclic change characteristics of the total amount of element assemblages with different genetic signi-ficance is the response of regional sea level change,which has regional consistency and can be used as the basis of regional stratigraphic correlation. |
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| Keywords: | Upper Yangtze area Liutang outcrop Wufeng Formation Longmaxi Formation chemical sequence stratigraphy |
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