再论震积岩及震积不整合——以川西、滇西地区为例  

A Re-study on Seismite and Seismo-Unconformity:Taking Western Sichuan and Western Yunnan as an Example

作　　者：梁定益[1] 聂泽同[2] 宋志敏[2] 

机构地区：[1]中国地质大学地质系,武汉430074 [2]中国地质大学地矿系,北京100083

出　　处：《地球科学（中国地质大学学报）》1994年第6期845-850,共6页Earth Science-Journal of China University of Geosciences

基　　金：地矿部地质行业基金和地矿部"八五攻关三江项目"(90027)资助

摘　　要：震积岩是“灾变事件岩”的典型代表。震积岩一般由原地相的地震扰动层与上覆的滑来震积层组成,无论后者是否发育,震积不整合都是存在的。伸展构造环境下形成的区域性震积不整合,属于伸展不整合。地震扰动层可以进一步分为软沉积及液化变形段、半固结变形的微褶皱和微断层段、脆性变形的震碎角砾岩段及韵律断层段等序列;群震型（多震旋回）剖面也可划分出前震、主震、后震等序列。地震扰动序列对识别震积岩很关键,群震型剖面及化石的有序混积对探讨活动构造有重要意义。Seismite is a typical instance of 'the rock of catastrophic event'. It is normally composed of a lower layer with autochthonous seismically disturbed beds and an upper layer with slumped seismites. A seismic unconformity exists no matter whether slumped seismites developed or not. A regional seismic unconformity shaped under extensional environment (conditions) may be called extensional unconformity. Furthermore, seismically disturbed beds may be divided into a sequence as following: the pliable sediment and the liquefied deformed section, semi-Consolidated section with tiny deformed folds and faults, the seismic breccia section of brittle deformation and the cyclothemic fault section. The profile of seismic cluster type (multiseismic cycle) is divided into a sequence of early seism, main seism and late seism. The seismically disturbed series is crucial for distinguishing the seismite from other rocks. The seismic cluster section and the orderly arranged fossils within the mixed rocks are of great importance for the exploration of active tectonics.

关 键 词：震积岩 震积不整合 地震 扰动序列 

分 类 号：P588.2[天文地球—岩石学]