张道军,张迎朝,邵磊,刘新宇,王亚辉,何小胡,崔宇驰
Zhang Dao-jun,Zhang Ying-zhao,Shao Lei,Liu Xin-yu,Wang Ya-hui,He Xiao-hu,Cui Yu-chi
摘要:
琼东南盆地中央峡谷沉积物来源是南海地区沉积学研究中的热点问题。研究采用稀土元素及碎屑锆石年龄等方法,对琼东南盆地中央峡谷上中新统—上新统以及盆地基底和周边可能源区开展对比分析。研究发现,中央峡谷西侧上中新统—上新统多数样品呈现出Eu元素正异常,峡谷东侧样品则以Eu元素的负异常为主,并且随着时代变新,呈现Eu元素负异常的样品数量增多;同时,样品中碎屑锆石年龄谱系也呈现规律性变化,峡谷西侧沉积物相对包含的古生代及元古代等古老锆石比峡谷东侧多,峡谷东侧的碎屑锆石年龄则以燕山期和印支期2个中生代年龄峰值为主。结果显示,越南中北部印支期的板块拼合带是中央峡谷的重要物源区,控制着中央峡谷的沉积充填,海南岛是中央峡谷另一重要物源区,其在中央峡谷西侧为次要物源,但是到峡谷东侧则为主要物源区。
中图分类号:
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