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前言中生代中酸性张家口火山杂岩分布于张家口市外围。面积約1000至1200平方公里。过去曾有賴格华[8],巴尔博[1]和张鉴模[7]等人进行过調查。該火山杂岩岩石类型繁多,层序复杂,产状保存較好,蝕变不深,是研究古火山岩的良好地区。作者在1956年至1957年期間进行了野外調查和室內研究。現对火山岩的产状,岩石及岩石化学特征作簡要报道,并对熔岩中碱长石斑晶的光性特征作嚐試性的探討。
Preface The acidic Mesozoic Zhangjiakou volcanic complex located in the periphery of Zhangjiakou City. Area of about 1000 to 1200 square kilometers. In the past, there have been investigations by Lai Gehua [8], Balbo [1] and Zhang Jianmo [7]. The volcanic complex rocks of various types, sequence complexity, good preservation of the occurrence, alteration is not deep, is a good area for the study of ancient volcanic rocks. The author conducted field surveys and in-house studies between 1956 and 1957. The occurrence, rock and petrochemical characteristics of volcanic rocks are briefly reported, and the photochemical characteristics of alkali-feldspar phenocrysts in lava are tentatively discussed.