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北京西山寒武系——奥陶系主要副层序类型及其形成机制探讨
引用本文:章雨旭,彭阳.北京西山寒武系——奥陶系主要副层序类型及其形成机制探讨[J].地质论评,1997,43(2):148-154.
作者姓名:章雨旭  彭阳
作者单位:中国地质科学院地质研究所 北京 (章雨旭,彭阳),中国地质科学院地质研究所 北京(高林志)
摘    要:北京西山寒武系-奥陶系出露良好,根据岩性组合特征,结合沉积结构,生物,地球化学等指杆标志,可区分出的副层序类型主要有6种,它们形成于不同的环境,其厚度一般几米,少数几十厘米或十几米,每类副层序中岩性可达4-6种,但单个副层序可仅由两种岩性构成,每一副层序反映的水叫是自下而上持续变浅,而在每两个副层序之间总是由浅水到深水的相跳跃。根据这些副层序的特征,可以推断在每两个副层序之间有一次海水突然加深过程

关 键 词:副层序  层序地层  形成机制  寒武纪  奥陶纪

CHARACTERISTICS OF MAIN TYPES OF PARASEQUENCE IN CAMBRIAN-ORDOVICIAN SYSTEM IN WESTERN HILLS, BEIJING AND FORMING MECHANISM OF PARASEQUENCE
Zhang Yuxu,Peng Yang and Gao Linzhi.CHARACTERISTICS OF MAIN TYPES OF PARASEQUENCE IN CAMBRIAN-ORDOVICIAN SYSTEM IN WESTERN HILLS, BEIJING AND FORMING MECHANISM OF PARASEQUENCE[J].Geological Review,1997,43(2):148-154.
Authors:Zhang Yuxu  Peng Yang and Gao Linzhi
Abstract:In the Western Hills, Beijing, Cambrian-Ordovician strata are well developed. Based on the characteristics of the rock association coupled with sedimentary structures and paleontological and geochemical indicators, 6 major types of parasequences may be distinguished. They were formed in different environments. Their thicknesses are commonly a few meters and, in a few cases, in the range from several dozens of centimeters to dozens of meters. Each type of parase-quence is composed of 4-6 kinds of rocks, but a single parasequence may be composed of only two kinds of rocks. Within each parasequence, the depth of water always becomes pregressively shallower upward, and between two parasequences, there always is a f acies jump from shallow to deep water. From the characteristics of these types of parasequences, it may be inferred that there is an abrupt deepening process of sea water between each two parasequences. And the presence or absence and stacking pattern of the parasequences depend on the abrupt deepening amplitude, the relation between the steady deepening and the deposition rate and the lasting time of the steady deepening. The system tract and sequence can be determined by the type of the parasequence group (regressive, progressive and accumulative), which is recognized from the trend of upward change of the same type of parasequence at the section. In addition, it is estimated that the abrupt deepening of sea water could not result from ice melt. So the Milankovich cycle could hardly lead to parasequence formation.
Keywords:parasequence  sequence stratigraphy  Cambrian  Ordovician  Beijing  Western Hills  
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