新疆“大哈拉军山组”火山岩的形成时代问题及其解体方案  

Age of the "Dahalajunshan" Formation in Xinjiang and its disintegration

作　　者：朱永峰[1] 周晶[1] 宋彪[2] 张立飞[1] 郭璇[1] 

机构地区：[1]造山带与地壳演化教育部重点实验室北京大学地球与空间科学学院,北京100871 [2]北京离子探针中心中国地质科学院地质研究所,北京100037

出　　处：《中国地质》2006年第3期487-497,共11页Geology in China

基　　金：国家自然科学基金项目(40572033);国家重点基础研究发展规划项目(2001CB409802)

摘　　要：基于前人的资料和本文获得的锆石SHRIMP数据,故建议解体“大哈拉军山组”。西天山东段拉尔敦达坂一带出露的火山岩是晚石炭世火山作用的产物,建议创名“拉尔敦达坂组”。新源城南的早石炭世火山-沉积岩依然使用“大哈拉军山组”。西天山西段大面积出露的“大哈拉军山组”火山岩比较复杂,原始创名剖面(特克斯南大哈拉军山一带)分布的早石炭世火山-沉积岩暂时继续使用“大哈拉军山组”的名称,但其北部大面积分布(昭苏北—特克斯—巩留-阿希金矿地区)的火山岩形成于晚泥盆世(而不是以前认为的早石炭世),建议用“特克斯达坂组”表述这套晚泥盆世火山—沉积地层。Based on previous research and zircon SHRIMP data, the authors suggest that the ＂Dahalajunshan Formarion＂ should be disintegrated into several different formations. They establish a new formation named the ＂ Laerdun Daban Formation＂ for the volcanic rocks exposed in the Laerdun Daban in the eastern segment of the West Tianshan, which are thought to be the product of Late Carboniferous volcanism. The ＂Dahalajunshan Formarion＂ will still be used for the Early Carboniferous volcanic-sedimentary rocks south of Xinyuan City. The volcanic rocks of the ＂Dahalajunshan Formation＂ exposed extensively in the western segment of the West Tianshan Mountains are relatively complex. Thus the name ＂Dahalajunshan Formation＂ will continue to be temporarily used for the Early Carboniferous volcanic-sedimentary rocks in the Dahalajunshan area south of Tekes where the original naming section of the ＂Dahalajunshan Formation＂ is distributed. The volcanic rocks distributed extensively in the northern part （northern Zhaosu-Tekesi-Gongliu-Axi gold mine area） formed in the Late Devonian rather than in the Early Carboniferous as previous believed. Therefore the authors suggest that a new name the ＂Tekes Daban Formation＂ be used for this suite of Late Devonian volcanic-sedimentary rocks.

关 键 词：新疆 大哈拉军山组 石炭纪 泥盆纪 火山岩 锆石SHRIMP 西天山 

分 类 号：P588.14[天文地球—岩石学]