地质通报2017，Vol.36Issue(2)：293-303,11.
新疆哈尔里克山琼祖尔开地区变质安山岩锆石U-Pb年龄和地球化学特征
Zircon U-Pb age and geochemical characteristics of meta-andesite in Qiongzuerkai area of Harlik Mountain, Xinjiang
摘要
Abstract
The studied volcanic rocks are mainly distributed in Qiongzuerkai area of Harlik Mountain. There are no accurate ages and geochemical data for these rocks, The genesis and the geodynamical background of these volcanic rocks have been controversial for a long time. In order to tackle this problem, the authors chose layered volcanic rocks in Qiongzuerkai area of Harlik Mountain as the study object. LA-ICP-MS zircon U-Pb ages of 309.9±4.6Ma(MSWD=2.6,n=9)and 304.6±1.8Ma(MSWD=0.84,n=11)from two meta-andesites suggest that these volcanic rocks erupted in Late Carboniferous. The meta-andesite is characterized by SiO 2 con-tent from 49.96%~62.22%, low TiO2(0.94%~1.7%)and high Al2O3(14.76%~16.25%). The meta-andesite forms a LREE-enriched distribution pattern with a strong contrast between LREE and HREE and the existence of negative Eu anomalies(δEu=0.88~0.94). Geochemical characteristics of meta-andesite suggest that this rock shows island-arc volcanic characteristics, being enriched in LILE such as Th, U, Ce, Rb and Ba and depleted in HFSE such as Nb, Ta and Ti. The mantle source was made up of crust melt, subduct-ed ocean crust melt and so on, with the addition of crustal material during plate subduction. Combined with regional data, the au-thors consider that the evolution of the Carboniferous volcanic activity might have been associated with the Kanggurtag basin.关键词
哈尔里克山/琼祖尔开/晚石炭世/LA-MC-ICP-MS锆石U-Pb年龄/地球化学/变质安山岩Key words
Harlik Mountain/Qiongzuerkai/Late Carboniferous/LA-MC-ICP-MS zircon U-Pb age/volcanic rock geochemis-try/meta-andesite分类
天文与地球科学引用本文复制引用
靳刘圆,朱志新,李平,朱彦菲..新疆哈尔里克山琼祖尔开地区变质安山岩锆石U-Pb年龄和地球化学特征[J].地质通报,2017,36(2):293-303,11.基金项目
国家305项目办公室"十二五"科技支撑计划重点项目《博格达-哈尔里克成矿带铜-金成矿条件研究及靶区评价》(编号:2011BAB06B04) （编号:2011BAB06B04）
