新疆东准泥盆系卡拉麦里组研究新进展

New Progress on the Study of Kalamaili Formation of Devonian in Dongzhun,Xinjiang

泥盆纪是新疆卡拉麦里碰撞带的关键时期,在碰撞带南侧广泛发育的泥盆系地层是卡拉麦里组,因此对其研究具有十分重要的意义。本文报道了近年来作者对卡拉麦里组研究的一些主要成果,包括:根据珊瑚和腕足类化石结合以及所测定的碎屑锆石年龄,指示其沉积时期为下、中泥盆世;根据沉积学研究,推断卡拉麦里组下段为重力流浊流沉积序列以及重力流水道相沉积类型,沉积环境为斜坡相-半深海相沉积环境,且卡拉麦里组自下而上是由深水相向浅水相演化。上述研究表明,卡拉麦里碰撞带在下、中泥盆世时期洋盆体系并没有关闭,而碰撞完成时间应在晚泥盆世,而后才进入到板内沉积阶段。

Kalamaili Formation in the past has been a quasi-Devonian East synonymous,a long time no one involved. The Devonian is the key period of the collision with Cara. In the chronology,based mainly on coral and brachiopod ancient fossils and detrital zircon geochronology also indicates the age for the next,Middle Devonian; sedimentary characteristics,according to the macro and micro（ microscopic） combined with the method of Cara,found in the wheat group gravity flow channel facies in lower part of gravity flow turbidite sequence and,the micro with gravel,sand and granule structure,determination of sedimentary environment for slope facies and semi deep sea sedimentary environment,change the past long thought that ＂Binhai traditional understanding＂. Bottom Kalamaili Formation opposed by deep shallow facies evolution.This Kalamaili Formation tectonic and sedimentary evolution of closely related early and mid relatively active,gravity flow relatively large,there are many unstable components,mainly feldspar and tuffaceous component based. Late feldspar,tuffaceous component gradually reduced to a final component to stabilize the marked increase in quartz. Kalamaili Formation biology,sedimentology series of new discoveries in the table Minka Lamech collision zone in the next,Middle Devonian period,oceanic basin system does not turn off,and the completion time of the collision should be in the middle,between the Late Devonian,After the deposition stage into the board.