尹崇玉,高林志

• 1:中国地质科学院地质研究所

摘要(Abstract)：

南华系是2000年第三届全国地层委员会审议通过,介于震旦(埃迪卡拉)系和青白口系之间的一个系级年代地层单位,地层范围是原震旦系下统含有新元古代冰积杂砾岩的地层。"南华系"名称来源于刘鸿允先生称谓的"南华大冰期"。由于近年来在华南和新疆获得了大量南华系SHRIMP锆石U-Pb年龄资料,结合莲沱组及其相当层位碎屑建造中发现指示寒冷气候的化学地层证据,南华系底界确定为出现新元古代最早冰期寒冷事件杂砾岩或与之相当的碎屑岩建造的下界;同时依据在华南和新疆所获得的南华系同位素年龄和化学地层资料,以及南华系所出现冰期或寒冷事件的地层序列,将南华系自下而上划分为下、中、上三统。下统时限为725~780Ma,中统时限为660~725Ma,上统时限为635~660Ma。南华系的下、中、上三统分别相当全球新元古代Kaigas冰期(≈770~735Ma),Sturtian冰期(≈715~680Ma),Marinoan冰期(≈660~635 Ma)。依据目前的同位素年龄资料,南华系底界年龄被厘定为780Ma;顶界年龄即震旦系底界年龄为635Ma。

关键词(KeyWords)： 年代地层;时限;地层划分;南华系;震旦系;新元古代;中国

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(No.41072005);; 中国地质调查局(121201113013900)项目资助

作者(Author): 尹崇玉,高林志

DOI: 10.19839/j.cnki.dcxzz.2013.04.017

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