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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:

第40卷

期数:

2018年第01期

页码:

49-60

栏目:

基础地质与矿产地质

出版日期:

2018-01-15

文章信息/Info

Title:

Geochemical Characteristics and Their Paleoclimatic Significance of the Varve from Dakangpu Layer of Lower Cretaceous Yixian Formation in Yixian Basin of the Western Liaoning, China

文章编号:

1672-6561(2018)01-0049-12

作者:

王铁晖; 巩恩普; 陈晓红; 许江; 黄文韬

1.东北大学 资源与土木工程学院，辽宁 沈阳 110819； 2.东北大学秦皇岛分校 资源与材料学院，河北 秦皇岛 066004

Author(s):

WANG Tie-hui;  GONG En-pu;  CHEN Xiao-hong;  XU Jiang;  HUANG Wen-tao

1. School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, Liaoning, China; 2. School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao 066004, Hebei, China

关键词:

地球化学; 纹泥; 义县组; 物源; 化学蚀变指数; 成分变异指数; 构造环境; 沉降速率

Keywords:

geochemistry;  varve;  Yixian Formation;  source;  chemical index of alteration;  index of component variability;  tectonic setting;  sedimentation rate

分类号:

P595

DOI:

-

文献标志码:

A

摘要:

辽西义县盆地义县组大康堡层剖面(辅助标准地层剖面)纹泥发育，占沉积层的60%~70%，为沉积期古环境研究提供了良好素材。通过对湖相纹泥进行岩石学及地球化学研究，探讨了大康堡层沉积期古气候、物源及湖水盐度变化。结果表明：纹泥化学蚀变指数多在65~67之间，变化幅度较小，对气候变化不敏感；w(Rb)/w(Sr)值较低，由下至上逐渐增大，大康堡层沉积期气候较温暖、湿润，存在寒冷、干燥向温暖、湿润变化的趋势；纹泥层偶厚度由下至上逐渐减小，降水量逐渐减少；成分变异指数在1.3~11.6之间，均大于1，代表了初始沉积产物及活动的构造环境；大康堡层物源以偏酸性火山岩为主，如义县组主期火山岩；稀土元素w(La)_n/w(Yb)_n值大于1，稀土元素在湖水滞留时间较长，沉降速率较慢；稀土元素w(La)_n/w(Yb)_n值由下至上逐渐减小，在垂向序列上沉积物沉降速率有逐渐增加的趋势，湖水盐度逐渐升高。

Abstract:

The varves are well developed in Dakangpu layer profile (auxiliary standard stratigraphic profile) of Yixian Formation in Yixian Basin of the western Liaoning, and cover 60%-70% of the deposition layer, which provide a good material for the study of palaeoenvironment during the depositional period. Based on the study on the petrology and geochemistry of varves, the paleoclimate, source and change of salinity of Dakangpu depositional period were discussed. The results show that the chemical index of alteration (CIA) is between 65 and 67 within a small range, and is insensitive to climate changes; w(Rb)/w(Sr) is low and increases gradually from bottom to top, suggesting the climate in Dakangpu depositional period is warm and moist with the trend from dry cold to warm humid; the couplet thickness of varve decreases gradually from bottom to top, and the precipitation gradually decreases; the index of component variability (ICV) changes from 1.3 to 11.6, more than 1, representing the existence of initial depositional product and active tectonic setting during the depositional period; the source of Dakangpu layer is dominated by partial acid volcanic rocks, such as the primary volcanic rocks of Yixian Formation;  w(La)_n/w(Yb)_n is greater than 1, and the retention time of REE is longer in the lake with a low sedimentation rate; w(La)_n/w(Yb)_n decreases gradually from bottom to top, and the sedimentation rate and the lake salinity are gradually increased.

参考文献/References:

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备注/Memo

备注/Memo:

收稿日期:2017-11-03;修回日期:2017-12-21
基金项目:国家自然科学基金项目(41172003);国家重点基础研究发展计划(“九七三”计划)项目(2012CB821905);中央高校基本科研业务费专项资金项目(N120601001)
作者简介:王铁晖(1980-),男,满族,辽宁清原人,工学博士研究生,E-mail:wangtiehuily@163.com。
通讯作者:巩恩普(1958-),男,辽宁沈阳人,教授,博士研究生导师,工学博士,E-mail:gongep@mail.neu.edu.cn。

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更新日期/Last Update: 2018-03-08