基本层序、标志层在1:50000区调中的应用及意义——以赣西北三都、修水幅古生界及三叠系地层

本文以基本层序、标志层在赣西北古生界以及三叠纪地层应用为例,阐述了这两种方法各自功能以及相互渗透、相互结合的作用。论述了这两种方法在1:50000区调中的作用以及重要性,强调了在加强层序地层学研究同时,应注意与一些具高分辨率的地层学方法结合起来,这是把区调层序地层学工作做得更好的保证。

APPLICATION AND SIGNIFICANCE OF BASIC SEQUENCES AND MARKER BEDS TO 1:50000 REGIONAL GEOLOGICAL SURVEYING:EXAMPLES FROM THE PALAEOZOIC AND TRIASSIC STRATA IN THE SANDU AND XIUSHUI SHEETS NORTHWESTERN JIANGXI

It is notorious that the marker beds have played an important part in the stratigraphic division and correlation of the regional strata,and prospecting of ore deposits.The basic sequences have constituted an important part of sequence stratigraphy since the 1990s,and are classified in terms of the superimposition of individual beds in the vertical sequences and boundary characteristics of sedimentary strata.They may be widely applied to the lithostratigraphic units composed of several lithologies.Exemplified by the Palaeozoic and Triassic strata in northwestern Jiangxi,the present paper has shed light on the application and integration of these methods cited above and their importance in the 1:50000 regional geological surveying.In addition,caution should be exercised in the integration pf sequence stratigraphy and high-resolution stratigraphy so as to improve our knowledge of regional sequence stratigraphy.