阴家润,孙立新,白志达,徐德斌,张绪教

• 1:中国地质大学
• 2:中国地质大学
• 3:中国地质大学
• 4:中国地质大学

摘要(Abstract)：

近期采集的菊石鉴定表明藏北安多地区布曲组、“夏里组”和“索瓦组”的时代为中巴通期至中卡洛维期。特别要指出的是 ,从藏北地区沉积演化和古生物地理区系的角度来看 ,该地不具备存在晚侏罗世提塘期“斯匹提页岩动物群”的地质背景 ,所以藏北地区近年来多次报道的晚侏罗世提塘期的“斯匹提页岩菊石动物群”值得怀疑 ,有关化石的鉴定是不可靠的 ;还应该指出的是 ,雁石坪地区侏罗纪岩石单位也不适宜在安多地区运用。双湖地区菊石层序指明该地富含油页岩的缺氧性沉积 ,即“海螂蛤页岩相”的时代为早侏罗世晚普林斯巴赫至早图阿尔期 ,它们是早侏罗世晚期全球性缺氧事件在东特提斯北缘的响应。

关键词(KeyWords)： 西藏;侏罗系;菊石类;生物地层

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金面上项目和重大国际合作项目 (No.40 0 72 0 0 1,40 3 2 0 12 0 168)

作者(Author): 阴家润,孙立新,白志达,徐德斌,张绪教

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