云南省洱源县新构造运动的ESR年代学证据

ESR Chronological Evidence of Neotectonic Movement in Eryuan County,Yunnan Province

金文正 ¹白万奎 ²叶治续³

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作者信息

1. 中国地质大学(北京)能源学院,北京 100083;非常规天然气能源地质评价与开发工程北京市重点实验室,北京 100083
2. 中国石化胜利油田分公司物探研究院,山东东营 257000
3. 中国石油天然气股份有限公司冀东油田分公司,河北唐山 063200
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摘要

云南省洱源县具有复杂的构造特征和强烈的新构造运动,为详细分析该地区新构造运动的基本特征,本次研究进行了野外岩石样品的电子自旋共振(ESR)年龄测定工作,结果表明:样品年龄数据介于62～1007ka之间,属于新构造运动时期;ESR年龄值由西向东具有逐渐减小的趋势,表明更新世以来,洱源县构造运动关键期由西向东逐渐变晚;结合样品所在海拔和ESR年龄,认为现今海拔高的区域,相对构造隆升时间早、持续时间长,具有较大隆升速率;现今海拔较低的盆山接触带新构造运动表现较为强烈,具有较小ESR年龄值、碎屑岩中的多条小型(伴生)断裂,且天然地震多发.

Abstract

Eryuan County,in Yunnan Province,has complex structural characteristics and intense Neotectonic movement.In order to detailed analyze the basic characteristics of the Neotectonic movement in this area,the Electron Spin Resonance(ESR)dating of rock samples in the field was carried out in this study.The results show that the age of the samples is 62～1007ka,which belongs to the Neotectonic period.The age of ESR decreased gradually from west to east,indicating that the critical period of Eryuan tectonic movement gradually became late from west to east since Pleistocene.Combined with the altitude of the samples and the age of ESR,it is considered that the present high altitude area has a higher uplift rate than the earlier tectonic uplift time and longer duration.The present-day basin-mountain contact zone at lower elevations shows strong Neotectonic movement,has a small ESR age,several small(associated)faults in clastic rocks,and is prone to natural earthquakes.

关键词

电子自旋共振/新构造运动/断裂/洱源县

Key words

electron spin resonance/Neotectonic movement/fault/Eryuan County

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基金项目

国家自然科学基金(41002072)

云南省科技计划(202302AF080001)

出版年

2024

四川地质学报

四川省地质学会

四川地质学报

影响因子：0.314

ISSN：1006-0995

参考文献量16

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