周洋,陈芳,苏新,吴聪,雷知生.南海东沙海域MIS 3期冷泉甲烷渗漏的钙质生物溶解证据[J].微体古生物学报, 2017, 34(03): 257-267.


南海东沙海域MIS 3期冷泉甲烷渗漏的钙质生物溶解证据
周洋 1 * 陈芳 1 苏新 2 吴聪 1 雷知生 1

+ 作者地址

1国土资源部海底矿产资源重点实验室, 广州海洋地质调查局, 广州 510075;

2中国地质大学(北京), 北京 100083

对南海东沙海域DH-CL5PC岩心开展了碳酸钙含量、钙质生物壳体保存状况,有孔虫群落结构组成及氧碳同位素分析,结果发现该岩心MIS 3期碳酸钙含量极低、5个层位钙质生物壳体出现显著溶解现象。发生溶解层位各门类钙质生物化石丰度显著降低,底栖有孔虫与浮游有孔虫丰度比例(底栖/浮游)大于1,有孔虫壳体化学溶蚀特征明显。分析其原因认为,陆源物质的稀释作用及潜在的钙质生物溶解作用共同导致了该岩心的碳酸钙含量极低,而甲烷的有氧氧化过程所形成的偏酸性环境可能是导致钙质生物壳体发生显著溶解的主要原因。根据有孔虫群落结构和钙质生物化石保存状况的差异性,推测DH-CL5PC岩心所在区域MIS 3期以来至少经历过5次甲烷渗漏至海底附近低氧或富氧区域的过程,而各期次甲烷渗漏的强度可能有所差异。钙质生物壳体溶解现象结合其他指标一定程度上可以作为反演地质历史时期甲烷渗漏过程和强度的有效指标。
语种: 中文   
基金: 国家自然科学基金项目(41506065,41372012)。
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