【摘要】 <正> (一) 工作区地质背景工作区位于江西东北部,包括抚州地区的礼陂、高家、玉华山和上饶地区的东乡、铅山共五个地区。均处于扬子准地台和南华准地台的过渡地带。工作区涉及地层属上侏罗统鹅湖岭组和打鼓顶组,岩性为碱性系列,中酸性-酸性火更多还原

【Abstract】 In this paper, the authors have studied systematically the complex structures of alkali feldspars of volcaniclastic rocks in the northeast part of iangxi province, mainly through X-ray single crystal analysis (including precessiol, method, standard orientation oscillation method and Weissenberg method), accompanied by X-ray powder diffraction, electron probe analysis and complex struotural analysis. Ten kinds of diffraction patterns of single crystals were concluded and discussed (some of which have not been reported yet). With messages got from the study, the authors tried to infer the cooling history of the rocks. The alkali feldspars which have side band diffraction and two phases (sodic and potassic phases) that are coherent were measured in order to determine the period of modulation (lamellar spacing) and the direction of exsolution. The structure of sanidine in one of the areas was also determined.更多还原