LOWER CRETACEOUS STORM DEPOSITS IN A'NAN REGION, ERLIAN BASIN

Zhang Tianying; Zhao Chenglin; Liu Menghui

doi:10.11743/ogg19910411

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LOWER CRETACEOUS STORM DEPOSITS IN A'NAN REGION, ERLIAN BASIN
Vol. 12, Issue 4, Pages: 449-455(1991)
Online First：25 December 1991，

Published：1991
DOI： 10.11743/ogg19910411
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DOI：

Zhang Tianying, Zhao Chenglin, Liu Menghui. LOWER CRETACEOUS STORM DEPOSITS IN A'NAN REGION, ERLIAN BASIN[J]. 1991, 12(4): 449-455. DOI： 10.11743/ogg19910411.

摘要

阿南地区早白垩世腾格尔组一段下亚段湖相碎屑岩中存在风暴沉积

层序自下至上依次为:(1)突变的底界与冲刷充填构造;(2)滞留沉积段;(3)大波状层理段;(4)丘状交错层理段

(5)波纹段;(6)生物活动段。本区风暴岩属搅混成因

其主要特征是;(1)不具单向底模;(2)底部粗碎屑段表现出振荡和多向水流形成的组构特征

无明显的粒序;(3)缺乏平行层理

发育丘状交错层理和波状层理。根据其层序差异和分布位置

划分出近岸型(粗型)和远岸型(细型)两类。

Abstract

Storm deposits were discovered in the lower submember of the first member of the Lower Cretaceous Tenggar Formation. The sedimentary sequences in ascending order are:1. Sharp basal boundary with scour-and-fill structure; 2. Basal lag section; 3. Large current-bedding section; 4. Hummocky cross-stratification section; 5. Ripple bedding section; 6. Bioturbate section. Based on these features

the tempestites were originated by stir-mix and the main properties are:1. Having no unidirectional basal casts; 2. The fabric characteristics formed by oscillation and multidirectional currents in basal clastic rock section; 3. Lacking parallel stratification and developing hummocky cross-sttatification and current bedding. According to the sequence differentiae and the distfibution localities

the storm deposits can be divided into nearshore (coarse) type and offshore (fine) type.