海南同安岭-牛腊岭火山地层划分与对比

CLASSIFICATION AND CORRELATION OF TONG’ANLING NIULALING VOLCANIC STRATA IN SOUTHERN HAINAN

摘要: 将同安岭—牛腊岭火山地层划分为六罗村组、汤他大岭组、岭壳村组，总厚度达５４２９ｍ。六罗村组下部以玄武安山质火山岩为主，上部为流纹质火山碎屑岩、熔岩；汤他大岭组主要为英安岩类火山岩，岭壳村组为流纹岩类的岩石，构成２个喷发旋回。根据同位素年龄，确定火山岩的时代为早白垩世，与海南岛下白垩统鹿母湾组为同期产物，相当于我国东南沿海白垩纪火山岩。

Abstract: The Tong’anling Niulaling volcanic strata are divided into the Liuluocun,Tangtadaling and Lingkecun Formations,with a total thickness up to 5429 m.The Liuluocun Formation consists dominantly of basalt andesitic rocks in the lower part and rhyolitic pyroclastics and lavas,the Tangtadaling Formation is composed chiefly of dacitic rocks,and the Lingkecun Formation is represented by rhyolitic rocks,which form two eruptive cycles.Volcanic rocks are Early Cretaceous in age and were formed contemporaneously with the Lower Cretaceous Lumuwan Formation in Hainan Island,being equivalent to Cretaceous volcanic rocks occurring along the coast of southeastern China.