北部湾涠洲岛南湾火山砂岩捕虏体光释光(OSL)测年结果  

OSL DATING OF A SANDSTONE XENOLITH IN THE VOLCANIC ROCKS OF THE NANWAN VOLCANO, WEIZHOU ISLAND, BEIBU BAY

作　　者：樊祺诚[1] 孙谦[1] 王旭龙[2] 尹功明[1] 龙安明 尹克坚 

机构地区：[1]中国地震局地质研究所,北京100029 [2]中国科学院地球环境研究所,西安710075 [3]广西壮族自治区地震局,南宁530022

出　　处：《地震地质》2006年第1期139-141,共3页Seismology and Geology

基　　金：国家自然科学基金(40572044);广西科学研究与技术开发项目(03220221)资助。

摘　　要：涠洲岛是北部湾内的一座火山岛,火山活动初步可以分为早-中更新世和晚更新世2期。晚期南湾火山是典型的射气岩浆喷发成因的火山,文中报道了南湾火山的上、下2层火山碎屑岩中砂岩捕虏体的光释光(OSL)测年结果,提出南湾火山喷发时代为距今约3万年左右的晚更新世末期。The Weizhou Island is a volcanic island in the Beibu Bay. Volcanic activity on the island can be roughly divided into two stages, mainly in the Early-Middle Pleistocene and the Late Pleistocene separately. Eruptions of the Nanwan Volcano （ late stage activity of Weizhou Volcanic Province） were typical phreatomagmatic eruptions, forming a big maar and thick ring walls of pyroclastics and debris. In this paper, we reported the OSL dating result of the sandstone xenoliths, which were trapped in the two volcanic pyroclastic layers of the Nanwan Volcano. The ages revealed that the activity of the Nanwan Volcano mainly occurred in ca 30ka ago, at the end of the Late Pleistocene.

关 键 词：北部湾涠洲岛 南湾火山 砂岩捕虏体 光释光(OSL)测年 

分 类 号：P317.3[天文地球—固体地球物理学]