摘要:
阿舍勒-冲乎尔火山沉积盆地是一个以火山岩并伴有陆源和内源沉积物的堆积场所,即该区泥盆纪地层是以事件作用的产物为其主要成分特点。显然,对其古地理的恢复、相的划分采用传统的相序分析方法是不合适的。作者认为要阐明该区泥盆纪的古地理面貌,必须在区域地层研究基础上,综合分析各种相标志和沉积物的特点,寻求它们的物理成因和地质成因解。在这一过程中,相的动力学分析显得尤为重要。本文在上述学术思想指导下,把本区泥盆纪的相分为成因相和环境相两大类,并对其中的微相进行了详细的阐述,从而为把沉积学的原理和方法应用了火山岩的搬运机制和堆积环境研究中提供了先期研究实例,同时为研究和恢复该区以至整个新疆北部泥盆纪的古地理格局打下了坚实的基础。
关键词:
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泥盆纪
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成因相
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环境相
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动力学
Abstract:
The Ashele-Chonghur volcanic-sedimentary basin is occupied by prominant volcanic rocks associated with terrigenous and intrabasinal sediments as the products of event deposition.The authors argue that the dynamic analysis of the sedimentary facies should be emphasized,because the palaeogeographic reconstruction and facies classification can be done relying not on the traditional facies sequence analysis,but on the synthetic analysis of distinct facies indicators and sediments on the basis of regional stratigraphic analysis.The Devonian sedimentary facies are grouped,in this paper,into two categories:genetic facies and environmental facies,and the detailed study is conducted on various microfacies,thus providing a pioneering example for the study of transport mechanism and accumulational environments of the volcanic rocks with the aid of sedimentological principles and methods,and a useful tool for the reconstruction of the Devonian palaeogeographic framework in the study area and even throughout northern Xinjiang.
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