吉林大学学报（地球科学版）
吉林大學學報（地毬科學版）
길림대학학보（지구과학판）
JOURNAL OF JILIN UNIVERSITY(EARTH SCIENCE EDITION)
2014年
2期
446-459
,共14页
燕山西段%雾迷山组%沉积相%层序地层学%地层格架
燕山西段%霧迷山組%沉積相%層序地層學%地層格架
연산서단%무미산조%침적상%층서지층학%지층격가
western Yanshan Mountains%Wumishan Formation%sedimentary facies%sequence stratigraphy%sequence stratigraphic framework
以野外露头观察和室内详细研究为基础，结合沉积模式和层序地层学基本原理，系统分析了燕山西段雾迷山组的沉积相特征，进行了单剖面的层序地层划分。燕山西段雾迷山组以环潮坪型碳酸盐沉积为主，陆源碎屑贫乏，叠层石非常发育。在延庆千沟剖面可以识别出26个三级层序，并进一步归为6个二级层序（S．1 S．6）。每个三级层序三分性明显，都由海侵体系域（TST）、早期高水位体系域（EHST）和晚期高水位体系域（LHST）组成。通过空间上的大范围追索和对比，建立了燕山西段雾迷山组的层序地层格架，绘制了其中5个主要阶段的栅状图（S．2 S．6），并且根据二级层序所表征的沉积相带空间展布初步恢复了雾迷山组沉积期的古地理环境，编制了相应的古地理图（S．2 S．6）。雾迷山组一、二段沉积期古地理环境表现为缓慢海侵，到三、四段沉积期海域范围达到最大值，随后在五、六段沉积期发生海退作用，沉积相带逐渐向沉降中心收缩，海域范围明显缩小。
以野外露頭觀察和室內詳細研究為基礎，結閤沉積模式和層序地層學基本原理，繫統分析瞭燕山西段霧迷山組的沉積相特徵，進行瞭單剖麵的層序地層劃分。燕山西段霧迷山組以環潮坪型碳痠鹽沉積為主，陸源碎屑貧乏，疊層石非常髮育。在延慶韆溝剖麵可以識彆齣26箇三級層序，併進一步歸為6箇二級層序（S．1 S．6）。每箇三級層序三分性明顯，都由海侵體繫域（TST）、早期高水位體繫域（EHST）和晚期高水位體繫域（LHST）組成。通過空間上的大範圍追索和對比，建立瞭燕山西段霧迷山組的層序地層格架，繪製瞭其中5箇主要階段的柵狀圖（S．2 S．6），併且根據二級層序所錶徵的沉積相帶空間展佈初步恢複瞭霧迷山組沉積期的古地理環境，編製瞭相應的古地理圖（S．2 S．6）。霧迷山組一、二段沉積期古地理環境錶現為緩慢海侵，到三、四段沉積期海域範圍達到最大值，隨後在五、六段沉積期髮生海退作用，沉積相帶逐漸嚮沉降中心收縮，海域範圍明顯縮小。
이야외로두관찰화실내상세연구위기출，결합침적모식화층서지층학기본원리，계통분석료연산서단무미산조적침적상특정，진행료단부면적층서지층화분。연산서단무미산조이배조평형탄산염침적위주，륙원쇄설빈핍，첩층석비상발육。재연경천구부면가이식별출26개삼급층서，병진일보귀위6개이급층서（S．1 S．6）。매개삼급층서삼분성명현，도유해침체계역（TST）、조기고수위체계역（EHST）화만기고수위체계역（LHST）조성。통과공간상적대범위추색화대비，건립료연산서단무미산조적층서지층격가，회제료기중5개주요계단적책상도（S．2 S．6），병차근거이급층서소표정적침적상대공간전포초보회복료무미산조침적기적고지리배경，편제료상응적고지리도（S．2 S．6）。무미산조일、이단침적기고지리배경표현위완만해침，도삼、사단침적기해역범위체도최대치，수후재오、륙단침적기발생해퇴작용，침적상대축점향침강중심수축，해역범위명현축소。
Based on field surveying on the outcrop and comprehensive laboratory study,combining with the fundamental principles and methods of sequence stratigraphy, the authors analyze the sedimentary characteristics of the Wumishan Formation occuring in the western Yanshan Mountains, which are mainly composed of tidal flat carbonate rocks and rich in stromatolite.The Qiangou section, the most complete section in study area,can be divided into 26 third-order sequences which can be combined into six second-order sequences (S.1 S.6).Every third-order sequence includes three parts, which are transgressive system tract,early highstand system tract,and late highstand system tract.By correlation of sequences in the study area,the sequence stratigraphic frameworks have been established. According to the distribution of sedimentary facies belts, the paleographic environment has been preliminarily reconstructed.During the deposition period of the Wumishan Formation,the paleographic environment of the First and Second Member was slow transgression.Up to the deposition period of the Third and Fourth Member,the paleo epicontinental sea reached maximum.After then,in the deposition period of Fifth and Sixth Member,the paleo sea regressed to the center of subsidence.
