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新疆大学地质与勘查工程学院
Published:2012
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[1]秦切,郭瑞清,张晓帆,等.新疆库鲁克塔格兴地Ⅳ号辉长-闪长岩体U-Pb锆石定年及地质意义[J].新疆大学学报(自然科学版),2012,29(02):240-248.
秦切, 郭瑞清, 张晓帆, et al. 新疆库鲁克塔格兴地Ⅳ号辉长-闪长岩体U-Pb锆石定年及地质意义[J]. Journal of Xinjiang University (Natural Science Edition in Chinese and English), 2012, 29(2): 240-248.
兴地Ⅳ号辉长-闪长岩体位于塔里木盆地东北缘的库鲁克塔格地区
兴地河基性-超基性岩带西端
岩体近椭圆形
北部侵人于花岗闪长岩体
部分侵入于早元古兴地塔格群角闪片岩和大理岩中
南部被第四系覆盖.文章对辉长-闪长岩体进行了全岩地球化学和锆石U-Pb年代学研究.结果显示
辉长-闪长岩属于大陆拉斑玄武岩系列
富集大离子亲石元素(LILE)和轻稀土元素(LREE)
亏损Nb、Ta、P和Ti等高场强元素(HFSE)和重稀土元素(HREE)
其源区是富集型大陆岩石圈地幔
岩浆上升侵位过程中发生结晶分异作用并遭受了地壳的混染.闪长岩锆石的LA-ICPMSU-Pb年龄为737.8±6.4Ma
与库鲁克塔格地区基性杂岩、基性岩墙、双峰式火山岩和碱性花岗岩共生
产于板内裂谷环境
是新元古代Rodinia超大陆的裂解作用的直接证据.
The Xingdi No.IVgabbro-dioritic pluton located in the west of the Xingdi River Ultramafic Rock Zone exposes an oval shape
which lies in the Kuluketag area at the northeast edge of Tarim basin.The northern parts of the pluton intrudes into the granodiorite pluton
some intrudes into the Early Proterozoic amphibolite schist and marble of Xingditage Group and is covered by Quaternary in the south.Systematic geochemistry and U-Pb zircon age were studied in this paper.The results show that gabbro-diorite belongs to Continental Tholeiite series and is enriched in LILE
LREE and depleted in Nb
Ta
P
Ti
HFSE and HREE
showing the source characteristics of enriched continental lithospheric mantle.Crystal fractionation and crustal contamination during magma emplacementaxe also recorded.Zircon LA-ICP-MS U-Pb dating obtains an age of 737.8±6.4Ma
representing the Neoproterozoic intrusion age.The pluton has the same age with mafic complex
dikes
bimodal volcanic rocks and alkali granites in Quruqtagh area.They are all formed in intra plate rift environment
as a direct evidence of the breakup of the Rodinia Supercontinent in Neoproterozoic.
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