CAJ | 학술논문

新疆西准噶尔地区是古生代经过俯冲-增生形成的复合造山带。该地区分布有多条蛇绿岩带,其中的拉巴西蛇绿岩带是比较重要的一条,通过对该蛇绿混杂岩特征的研究,认为该区蛇绿岩尽管受到强烈的多期构造肢解,但根据岩石类型仍能恢复蛇绿岩的原始层序。本文重点讨论了拉巴西蛇绿混杂岩的地球化学特征,认为其形成时代为晚寒武世-中奥陶世,就位时代为中晚志留世,蛇绿混杂岩产于弧前或弧后小洋盆环境。研究发现,该蛇绿混杂岩具有明显的铬铁矿化,为下一步找矿指明了方向。
신강서준갈이지구시고생대경과부충-증생형성적복합조산대。해지구분포유다조사록암대,기중적랍파서사록암대시비교중요적일조,통과대해사록혼잡암특정적연구,인위해구사록암진관수도강렬적다기구조지해,단근거암석류형잉능회복사록암적원시층서。본문중점토론료랍파서사록혼잡암적지구화학특정,인위기형성시대위만한무세-중오도세,취위시대위중만지류세,사록혼잡암산우호전혹호후소양분배경。연구발현,해사록혼잡암구유명현적락철광화,위하일보조광지명료방향。
Junggar area of western Xinjiang is a composite orogenic belt formed by the subduction-accretion in Paleozoic.There are numbers of ophiolite belts in this area.The Labaxi ophiolite belt in the Junggar area is more important one among them.By the research of ophiolite rock,the authors found that the rock experienced strong tectonic dismemberment,but the original sequence of the ophiolite can be still restored on the basis of the rock types.In this paper,the authors focus on the study of the geochemical characteristics of the ophiolite in Labaxi profile,and consider that the ophiolite is formed in the Late Cambrian-Middle Ordovician,its emplacement time is in the middle-late Silurian,and the ophiolite belt is formed in a fore-arc or back-arc ocean basin environment.The research shows that this ophiolite belt has chromite obviously,therefore,it is showed the clearly prospecting direction for the next work.