造山带非史密斯地层研究方法和在1:5万区调填图中的初步应用

Ophiolite complex:a reconnaissance application of non Smith stratigraphic study to 1:50 000 geological mapping

根据在赣东北１∶５ 万葛源幅蛇绿混杂岩区区调的实践体会，提出在区调填图中进行非史密斯地层研究的一般步骤：（１） 利用野外踏勘和前人资料，划分区内地层类型；（２） 区分岩块和基质；（３） 选择一定靶区对岩块进行成分、古生物、同位素等的细致研究，以获得年代和构造背景等信息；（４） 识别岩块、基质及与史密斯地层之间的相互接触关系，并探索其构造就位时间；（５） 重建地层序列，探讨构造演化史。

With the experience of Geyuan sheet 1∶50 000 geological mapping in the ophiolite complex in the northeast Jiangxi province,the authors put forward a proposal for non Smith stratigraphic study in geological mapping in similar areas.The study includes:(1) field reconnaissance and reinterpretation of previous data,thereafter subdivision of the stratigraphic units;(2) distinguish of adventitious rock blocks and matrixes;(3) selection of target area for detailed study of composition,paleontology and isotopes to gain data on age and tectonic setting;(4) identification of the rock blocks,matrixes and the association to non Smith stratigraphic units,and determination of timing of the tectonic emplacement;(5) re establishing stratigraphic sequence and interpreting the tectonic evolution history.