赣西北前寒武系首次发现内波内潮汐沉积  

FIRST DISCOVERY OF INTER-WAVE AND INTER-TIDE DEPOSITS FROM THE PRE-CAMBRIAN IN NORTHWESTERN JIANGXI

作　　者：郭建秋[1] 张雄华[1] 章泽军[1] 谢树成[1] 殷鸿福[1] 

机构地区：[1]中国地质大学地球科学学院,武汉430074

出　　处：《地质科学》2004年第3期329-338,i002,共11页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：国土资源部中国地质调查局 1:5万山口街 (H5 0E 0 2 0 0 0 2 )项目资助;征村幅(H5 0E 0 1 90 0 2 )区域地质调查项目资助

摘　　要：本文详细论述了赣西北前寒武系首次发现的深水牵引流内波内潮汐沉积特征的沉积构造、岩石组合和沉积序列。沉积构造主要发育双向和单向交错层理、曲线型和干涉波痕及波状、脉状、透镜状层理 ;常产于深水重力流之上或与之共生。岩石粒度结构特征为明显的牵引流性质。共划分出双向交错层理砂岩组合 ,单向交错层理砂岩组合 ,薄层砂岩—板岩组合和波状、脉状、透镜状细砂岩—粉砂岩—板岩组合 ;可识别出双向递变、单向递变和对偶层递变序列。在综合研究和分析的基础上 ,进一步阐述了内波内潮汐沉积与浊流沉积的异同点和相互关系以及内波内潮汐沉积的保存条件、沉积环境和控制机理。深水牵引流内波内潮汐沉积学特征的系统研究 ,对正确阐明沉积盆地的大地构造背景及形成演化具有重要意义。The sedimentary backgrounds and sedimentary characteristics of deep water tractive current inter wave and inter tide deposits, firstly discovered in northwestern Jiangxi, were discussed in detail. They were characterized by particular sedimentary structures, petrofacies and successions. The sedimentary structures included, mainly, unidirectional and bidirectional cross beddings, interference and curved ripple marks, and wavy, flaser and lenticular beddings, usually developed on deep water gravity flow deposits, or paragenetic with it. Their grain size distribution appeared the characteristics of tractive current deposits clearly. Firstly, the deposits could be divided into bidirectional cross bedding sandstone combination, unidirectional cross bedding sandstone combination, sandstone and slate combination of thin bedded alternation, and flaser, wavy and lenticular fine sandstone, siltstone and slate combination. Secondly, the bidirectional graded succession, unidirectional graded succession and antithetic graded succession could be identified in the deposits. Finally, Based on the comprehensive study and analysis, the relation and difference of the inter wave and inter tide deposits with the turbidity current deposits, and their presevation conditions, sedimentary environment and controlling mechanism were expounded. The systematic study on the sedimentary characteristics of the inter wave and inter tide and the deep water tractive current deposits had an important significance for properly recognizing the geotectonic background and evolution of sedimentary basins.

关 键 词：内波内潮汐沉积 前寒武系 赣西北 深水牵引流 沉积序列 

分 类 号：P512.2[天文地球—地质学] P534.41