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全新世以来珠江三角洲快速沉积体初步研究
Preliminary Study on the rapid deposition bodies in the Pearl River Delta since Holocene
投稿时间:2009-07-21  修订日期:2010-01-19
DOI:
中文关键词:  珠江三角洲  地形边界  快速沉积体  成因
英文关键词:Pearl River delta  morphologic boundary  rapid deposition bodies  mechanism
基金项目:40176026, 40331007和40676056
作者单位邮编
贾良文 中山大学 510275
何志刚 中山大学 
莫文渊 中山大学 
吴超羽* 中山大学 510275
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中文摘要:
      本文根据珠江三角洲代表性钻孔资料以及PRD-LTMM长周期“动力-沉积-形态”模型分析了珠江三角洲形成发育过程中的快速沉积现象,提出了珠江三角洲快速沉积体的概念,对典型快速沉积体的成因进行了初步分析。快速沉积体有明确的沉积环境和特定的沉积动力成因,沉积速率为每年厘米级,其研究可以深入地揭示珠江三角洲基本沉积单元的形成过程,为探索珠江三角洲的形成、发育机制打下基础。初步发现的快速沉积体有古汇潮点快速沉积体、古涨潮射流快速沉积体和台地周边快速沉积体。初步研究表明,快速沉积体的形成多与特定的地形边界条件下形成的中、小尺度动力结构有关,具有高度的时空变化。掌握珠江三角洲地形边界的特点、变化过程及其作用下的中、小尺度动力结构是研究珠江三角洲快速沉积体的关键。
英文摘要:
      Based on the typical bore holes of the Pearl River delta (PRD) and the long-term morphodynamic model PRD-LTMM, the rapid deposition body (RDB) is examined in this paper. The RDB is defined, and the formations of typical RDBs in the PRD are analyzed initially. The RDBs hold the specific sedimentary environment and particular sedimentary dynamics with the annual deposition rate of centimeters, so, the research on RDBs could help disclose the mechanism of the basic sedimentary units in the PRD, providing a basis for the study of mechanism of the PRD evolution. The initially discovered RDBs include depositions at the paleo-tide convergent flow and the paleo-flood tidal jet, fringing deposition around the mesa. The Preliminary study shows that the formation of RDBs, highly variable in time and space, is related to the small to medium scale dynamic structures under particular morphologic boundaries. The understanding of the morphologic boundary,its evolution process and medium to small scale dynamic structures under corresponding morphologic boundary in the PRD is key to the research of RDBs.
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