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新疆北部卡拉麦里斜长花岗岩的锆石U-Pb年龄及其构造意义
引用本文:唐红峰,苏玉平,刘丛强,侯广顺,王彦斌.新疆北部卡拉麦里斜长花岗岩的锆石U-Pb年龄及其构造意义[J].大地构造与成矿学,2007,31(1):110-117.
作者姓名:唐红峰  苏玉平  刘丛强  侯广顺  王彦斌
作者单位:1. 中国科学院地球化学研究所地球深部物质与流体作用地球化学研究室,贵州,贵阳,550002
2. 中国科学院地球化学研究所地球深部物质与流体作用地球化学研究室,贵州,贵阳,550002;中国科学院研究生院,北京,100049
3. 中国地质科学院地质研究所,北京,100037
基金项目:国家重点基础研究发展计划(973计划),中国科学院"西部之光"人才培养计划
摘    要:新疆北部卡拉麦里构造带发育与蛇绿岩伴生的斜长花岗岩,其时代、成因及与蛇绿岩的关系是目前还存在争议的问题。本文报道了该斜长花岗岩的锆石SHRIMP U-Pb年龄和地球化学组成。研究表明,斜长花岗岩的成岩年龄为373Ma,εNd(t)与亏损地幔一致,与典型蛇绿岩中的斜长花岗岩有相似的微量元素特征,与卡拉麦里蛇绿岩中辉长岩有相似的平坦型稀土元素配分模式,两者在La/Sm-La图上符合结晶分异趋势。因此,卡拉麦里斜长花岗岩属于大洋斜长花岗岩,是来源于亏损地幔的基性岩浆通过结晶分异作用的产物,其成岩年龄373Ma代表了卡拉麦里蛇绿岩的形成时代。

关 键 词:斜长花岗岩  锆石SHRIMP  U-Pb年龄  Nd同位素组成  卡拉麦里  新疆
文章编号:1001-1552(2007)01-0110-08
修稿时间:2005-12-27

ZIRCON U-PB AGE OF THE PLAGIOGRANITE IN KALAMAILI BELT, NORTHERN XINJIANG AND ITS TECTONIC IMPLICATIONS
TANG Hongfeng,SU Yuping,LIU Congqiang,HOU Guangshun,WANG Yanbin.ZIRCON U-PB AGE OF THE PLAGIOGRANITE IN KALAMAILI BELT, NORTHERN XINJIANG AND ITS TECTONIC IMPLICATIONS[J].Geotectonica et Metallogenia,2007,31(1):110-117.
Authors:TANG Hongfeng  SU Yuping  LIU Congqiang  HOU Guangshun  WANG Yanbin
Abstract:There are several plagiogranite bocks occurring together with ophiolites in Kalamaili tectonic belt in Northern Xinjiang. The age and petrogenesis of the plagiogranite, and its relation with the ophiolites are still controversial. In this paper zircon SHRIMP U-Pb age and geochemical compositions of the plagiogranite are reported. The results indicate that the plagiogranite shows an age of 373Ma, εNd(t) value accordant with that for depleted mantle, and trace element characteristics almost identical to those for plagiogranite found in other places such as typical Troodos ophiolite. Furthermore, the REE pattern of the plagiogranite is flat and similar to that of the gabbro in Kalamaili ophiolite. In the plot of La/Sm-La the plagiogranite and gabbro show a trend typical of crystal fractionation. As a result, the plagiogranite in Kalamaili belt belongs to an oceanic plagiogranite formed by crystal fractionation from basic magma originated directly from depleted mantle, and hence its age of 373Ma represents the formation time of Kalamaili ophiolite.
Keywords:plagiogranite  zircon SHRIMP U-Pb age  Nd isotopic composition  Kalamaili  Xinjiang
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