作　　者： ; ; ; ; ;

机构地区： 东北大学资源与土木工程学院地质系

出　　处： 《世界地质》 2008年第2期130-136,共7页

摘　　要： 分析生物礁灰岩中C,O,Sr同位素及微量元素组成有助于研究生物礁体的形成环境。研究表明:δ13C值的变化与生物埋藏量、埋藏速率、海平面的变化有着很密切的关系;海平面上升,δ13C值增大,同时表明造礁生物大量繁殖;δ18O值的变化反映古环境的温度变化,δ18O升高,温度降低;87Sr/86Sr的比值与海平面的升降变化表现一种负相关性,海平面上升,87Sr/86Sr的比值降低。Sr,Mn等微量元素可以间接指示礁体环境变化,并且验证了所采集的样品数据的准确性。环境变化是决定生物礁发育的重要影响因素。 Analyzing constitution of carbon, oxygen isotopes and trace elements is helpful for the research on environment of reefs. The study shows that the value of δ^13C is closely related to the biologic imbed, imbed speed and change of sea level. As in highstands, δ^13C became bigger in value, also indicating reef-building organism reproduced in quantity; the value varying of δ^18O reflected the change of temperature in the paleoenvironment. As δ^18 O increased, the temperature decreased. It is negative correlation for the ratio of ^87Sr/^86Sr with the change of sea level. The ratio of ^87Sr/^86Sr decreased in highstands. Trace elements e. g. Sr and Mn, can indirectly indicate the change of paleoenvironment of reefs, and validate the veracity of the data of the samples. The development of the reefs depends upon change of paleoenvironment.

关 键 词： 生物礁体 同位素 同位素 同位素 微量元素 礁体环境

领　　域： [天文地球] [天文地球]