辽西四合屯地区义县期火山作用对沉积环境的影响
Influences of Yixianian Volcanism on Sedimentary Environment in Sihetun Area, West Liaoning
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摘要: 辽西四合屯地区中生代火山活动发育,广泛分布着火山作用形成的爆发相、溢流相火山岩。在显生宙地球历史中,如此巨大且迅速的火山作用普遍被认为是巨大种群灭绝的原因。与火山作用相联系的沉积相是火山作用间歇期形成的冲积扇-河流相、滨湖相、半深湖-深湖相,这些沉积相提供了研究火山作用对沉积环境影响的依据。义县期火山作用对沉积环境影响包括:义县期各沉积环境火山作用产物及火山岩风化产物的充填;各沉积相被当地多期(次)火山岩控制并埋藏于其下的火山-沉积相组合由下至上“螺旋式”规律性变化;义县期火山作用引起地表抬升与构造地形的变化,从而影响排流模式的变化;经历火山作用影响的生物群提供了义县期气候变化证据。Abstract: Volcanic eruption facies and flooding facies are extensively developed in the Sihetun area,west Liaoning.Such voluminous and rapid volcanic activities in Phanerozoic have commonly been thought to be a cause for zoobio cenose extinction.The all uvial-fluvial,shore-shallow lacustrine,semi-deep and deep lacustrine facies were developed during volcanic dormancies,which provide evidence to study the influences of volcanism on sedimentary environment.The influences include: infilling of both volcanic and weat hering materials; burial and control by multiphased volcanic activities and upwar dchanges of volcanic-sedimentary facies associations; the Yixianian volcanic activities initiated crustal uplift and tectonot-opographic changes,which in turn affect draining modes; the biota experiencing volcanism influences can be evident for climate change.
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Key words:
- influences /
- sedimentary environment /
- volcanism /
- Yixianian age /
- Sihetun area
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