海相火山沉积盆地层序地层研究:以新疆阿舍勒、冲乎尔地区泥盆系地层为例

SEQUENCE STRATIGRAPHY OF MARINE VOLCANO-SEDIMENTARY BASINS:AN EXAMPLE FROM THE DEVONIAN STRATA IN THE ASHELE-CHONGHUR REGION,XINJIANG

关键词:  海相火山沉积盆地  露头层序地层  泥盆纪  阿舍勒  冲乎尔

Key words:  marine volcano-sedimentary basin  outcrop sequence stratigraphy  Devonian  Ashele  Chonghur

摘要:

层序地层研究业已成为沉积地质学研究领域的热点。前人主要集中研究陆源碎屑岩和碳酸盐岩条件的层序发育特点,而较少涉猎海相火山沉积盆地的层序地层探讨。新疆阿舍勒、冲乎尔地区泥盆纪火山沉积盆地是以火山岩为主,伴有陆源和内源沉积物的堆积场所,对其地层进行露头层序地层研究后发现,其沉积层序形成的主控因素、发育特点以及层序界线的识别标志均有其独特之处:不仅与海平面变化相关,而且与构造作用、火山喷发旋回息息相关。

Abstract:

The present paper focuses on seqence stratigraphy of marine volcano-sedimentary basins in the Ashele-Chonghur region,Xinjiang.These Devonian volcano-sedimentary basins are occupied dominantly by the volcanic rocks in association with terrigenous and intrabasinal sediments.The authors suggest,on the basis of the studies of outcrop se-quence stratigraphy,that the main controlling factors and characteristics of the sedimenta-ry sequences and the criteria for the recognization of the sequence boundaries are quite dif-ferent in the study area from those elsewhere.The formation of the sedimentary sequences herein is closely bound up not only with sea-level changes but also with tectonic activity and volcanic eruptive cycles.