CAJ | 학술논문

以湖南慈利溪口埃迪卡拉系陡山沱组剖面为研究对象，分析了64件碳酸盐岩样品的微量元素以及稀土元素特征。结果表明，利用 U ／Th、Ce 异常和 Ca ／Mg 等多种指标识别出的陡山沱期古氧化还原环境与层序地层学的研究结果基本一致，说明碳酸盐岩的这3个指标在重建埃迪卡拉纪古海洋环境的研究中具有一定的适用性。稀土元素配分模式在陡山沱组底部和中部均发生了明显的由典型淡水模式向典型古海水模式的转变，很可能指示了在 Marinoan 冰期和 Gaskier 冰期结束之后，大量的间冰期冰融淡水注入海洋并逐步被古海水取代。较高的 Eu 异常值以及前人在溪口剖面发现的多期古地震证据可能暗示了海底热液活动几乎贯穿于整个埃迪卡拉纪陡山沱期，且具有早期剧烈、晚期逐渐趋于平缓的特征。多期次的海底热液活动为古海洋提供了重要的磷质来源，对埃迪卡拉纪生物的出现与繁盛具有重要的意义。
이호남자리계구애적잡랍계두산타조부면위연구대상，분석료64건탄산염암양품적미량원소이급희토원소특정。결과표명，이용 U ／Th、Ce 이상화 Ca ／Mg 등다충지표식별출적두산타기고양화환원배경여층서지층학적연구결과기본일치，설명탄산염암적저3개지표재중건애적잡랍기고해양배경적연구중구유일정적괄용성。희토원소배분모식재두산타조저부화중부균발생료명현적유전형담수모식향전형고해수모식적전변，흔가능지시료재 Marinoan 빙기화 Gaskier 빙기결속지후，대량적간빙기빙융담수주입해양병축보피고해수취대。교고적 Eu 이상치이급전인재계구부면발현적다기고지진증거가능암시료해저열액활동궤호관천우정개애적잡랍기두산타기，차구유조기극렬、만기축점추우평완적특정。다기차적해저열액활동위고해양제공료중요적린질래원，대애적잡랍기생물적출현여번성구유중요적의의。
Trace element and rare earth element (REE) of 64 carbonate rock samples from the Edi-acaran Doushantuo Formation of Xikou section,Cili County,Hunan Province are analyzed.Palaeoredox indicated by the combination of U /Th,Ce anomalies and Ca /Mg is in accordance with that by sequence stratigraphic studies,suggesting that the three proxies in carbonates are applicable in reconstructing palae-oredox environment of the Ediacaran.In the bottom and middle of Doushantuo Formation,the REE distri-butional pattern changes from typical fresh water to typical sea water,probably indicating the injecting of deglacial meltwater and thus being replaced by normal sea water during the post-Marinoan and post-Gaskier period.The strong Eu anomalies,relatively higher Eu value as well as the seismites discovered in Xikou section by previous research may suggest that the hydrothermal activity probably occurs during the whole Doushantuo Age,being strong in the early and then weakened in the late stage.The hydrothermal activity may be of great significance to the appearance and the bloom of Ediacaran biota because of the important phosphorus supply.