新疆西准噶尔布龙果尔组的建造类型、时代及有关问题研究的新进展

本文对布龙果尔组的建造类型及地质时代进行了论证,认为其应属磨拉石建造叠加坍塌建造的复合型建造,并将其地质时代从晚奥陶世厘正为早志留世早期。此外,首次提出早古生代西准噶尔北部地区有一次造山运动,这次运动北疆邻区称为“艾比湖运动”,其发生的确切时间应为晚奥陶世末期。最后,根据布龙果尔组中出现蛇绿岩套的近源砾石。推断洪古勒楞蛇绿岩的形成年代早于早志留世。可能是奥陶纪。

NEW ADVANCES OF RESEARCH ON THE FORMATION TYPE, GEOLOGIC AGE AND RELATED PROBLEMS OF BULONGGUOR FORMATION IN WEST JUNGGAR, XINJIANG

The paper deals with the formation type and geologic age of Bulongguor Formation in West Jungsar of Xinjiang. It is regarded as a compound type composed of molasse formation reduplicated with olistolitic formation, and its ge.ologic age is corrected to Early Silurian from Late Ordovician. In addition, the authors put forward for the first time that there is an orogenic movement which took place by the end of the Late Ordovician in the northern part of West Junggar, and was called "Ebnur orogeny" in the neighbouring area of Northern Xinjiang.Finally, based on the occurence of some near source gravels of ophiolite suite in Bulongguor Formation of Early Silurian, the authors infer that the age of Hongguleleng ophiolite complex was earlier than that of Bulongguor Forma-,tion, and may be of Ordovician, as to the further conclusion, it is impossible for lack in more evidence.