珠江口盆地LF13-2-1井始新统孢粉组合

重新研究了珠江口盆地LF13-2-1井3020～3272.5m井段的孢粉地层学.根据重新鉴定的孢粉资料,3140～3230m井段孢粉组合称栎粉-五边粉组合,可与珠三坳陷WC19-1-3井文昌组—神狐组及北部湾盆地WS1-3-1井流沙港组二段的孢粉组合对比,时代为中始新世.该井段以下12m厚的安山质凝灰岩、砂泥岩的孢粉组合称栎粉-桤木粉-紫箕孢组合.在南海北部陆架,这一孢粉组合可与WS1-3-1井流沙港组三段孢粉组合对比,时代为早始新世.建议将合该孢粉组合的这一岩组命名为“陆丰组”.

EOCENE PALYNOLOGY OF WELL LF13-2-1 IN PEARL RIVER MOUTH BASIN

This paper deals with palynological stratigraphy in the 3020-3272- 5m interval of LF13-2-1 well, Pearl River Mouth Basin. The task is to restudy the division and correlation of mudstone in the 3140-3230 m interval. Based on the new palynological data, the assemblage of the interval between 3140m and 3230m is named Quercoidites-Pentapollenites assemblage, and compared with the assemblage of the Wenchang and Shenhu Formations of Zhu-3 Depression in Pearl River Mouth Basin and the second member of the Liusha-gang Formation in WS1-3-1 well, Beibu Gulf Basin, which are dated as middle Eocene. Underlying this interval there is an interval of 12m-thick andesitic tuff, sandstone and shale, from which Quercoidites-Al-nipollenites-Osmundacidites assemblage is discovered. On the northern shelf of South China Sea, the latter assemblage can only be compared with the third member of Liushagang Formation in the WS1-3-1 well, Beibu Gulf Basin. Accordingly, it is named Lufeng Formation and its age belongs to early Eocene.