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地球学报  2005 

义县组研究的新认识

DOI: 10.3975/cagsb.2005.01.05

Keywords: 义县组,地层,时代,辽西

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Abstract:

辽西地区义县组是一套中生代陆相火山-沉积岩系,主要由中-基性火山熔岩、火山碎屑岩及湖泊相(包含少量的河流相)沉积岩构成。依据火山活动的规律性,将义县组划分为4个岩性段,自下而上为:底砾岩基性-中基性火山岩段;湖相沉积(或称珍稀化石层)岩中性、酸性火山岩段;基性、中基性-酸性、偏碱性火山岩段和砾岩(包括沉火山角砾岩)中酸性、偏碱性火山岩段。义县组中包含6个化石层位,其中义县组一段的底砾岩和基性、中基性火山岩的(沉)凝灰岩中产有丰富的以鹦鹉嘴龙为主的古脊椎动物化石;二段的湖相沉积岩中含有大量热河生物群化石,包括著名的中华龙鸟、孔子鸟和辽宁古果等珍稀化石,是义县组的最主要化石产出层位,且湖相化石层基本上为同一时期的产物。根据化石研究和同位素测定结果,将义县组的时代定为早白垩世。

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