锡铁山铅锌矿床含矿岩系主褶皱的初步厘定

锡铁山铅锌矿床含矿岩系主褶皱是一个由绿片岩片理褶皱而成的斜卧褶皱。主褶皱枢纽澡走向波状起伏，转折端较开阔，两翼向深部紧闭。

PRELIMINARY RECOGNIZATION OF THE MAIN PHASE FOLD WITHIN ORE BEARING LITHOLOGICAL SERIES IN THE XITIESHAN LEAD ZINC DEPOSIT,QINGHAI PROVINCE

It is found that the main phase fold developed within the ore bearing metamorphic rock series in the Xitieshan lead zinc deposit is an oblique fold of schistosities (S 0+S 1) green schists.The fold is a gentle hinge zone with sag and swell from place to place. Its turning end is open, and both limbs are tightly closed toward depth.It is revealed that the orebodies are mainly formed within the saddle like spaces between marbles and green schists in the hinge zone of the fold, and that the orebodies are clearly controlled and/or affected by the spatial distribution patterns and its completeness of the fold.The recognization of the main phase fold and the study of its features are significant for understanding the way how structures control the mineralization,and for effective prospecting.