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| 西藏措勤尼雄矿田滚纠铁矿侵入岩LA-ICP-MS 锆石 U-Pb年龄与地球化学特征 | |
| 引用本文： | 于玉帅,高原,杨竹森,田世洪,刘英超,曹圣华,胡为正,郄海满.西藏措勤尼雄矿田滚纠铁矿侵入岩LA-ICP-MS 锆石 U-Pb年龄与地球化学特征[J].岩石学报,2011,27(7):1949-1960. |
| 作者姓名： | 于玉帅 高原 杨竹森 田世洪 刘英超 曹圣华 胡为正 郄海满 |
| 作者单位： | 1. 武汉地质矿产研究所,武汉430205;中国地质科学院矿产资源研究所,北京100037 2. 江西省地质调查院,南昌,330201 3. 中国地质科学院地质研究所,北京,100037 |
| 基金项目： | 本文受国家重点基础研究发展计划973项目(2011CB403100、2009CB421007)、"十一五"国家科技支撑计划项目(2006BAB01A04)和地质调查计划项目(1212010918014)联合资助. |
| 摘 要： | 本文分析了尼雄矿田滚纠铁矿与成矿相关的花岗闪长岩和二长花岗岩主量元素、微量元素并对其进行锆石LA-ICP-MS U-Pb定年。结果显示,岩石富硅(SiO2平均分别66.76%和70.98%)、富碱(ALK平均为6.28%和7.70%),铝饱和指数均小于1.1,属中高K钙碱性I型花岗岩。两者具相似的稀土元素球粒陨石标配分模式图和微量元素原始地幔蛛网图,∑REE较低(∑REE分别是 130.6×10-6和134.3×10-6),弱Eu负异常(δEu分别为0.84和0.88),弱-中等轻重稀土分馏,(La/Yb)N分别平均8.07和6.72。 Rb、Pb、Th等大离子亲石元素和稀土元素富集,Ba和U、Nb、Ta、P 、Ti等高场强元素亏损,显示弧岩浆作用特点,指示岩石形成于弧后伸展环境,岩浆源区具壳幔混源的特征。LA-ICP-MS锆石U-Pb测年显示花岗闪长岩和二长花岗岩分别形成于113.6±1.2Ma和112.6±1.6Ma,属早白垩世晚期岩浆活动产物。结合区域地质资料,认为滚纠铁矿与成矿相关的花岗闪长岩和二长花岗岩因班公湖-怒江洋壳向南俯冲,并于~113Ma发生冈底斯陆壳和羌塘陆壳对接,已俯冲的班公湖-怒江洋壳发生板片回转,导软流圈地幔流体上涌,其所带来的巨大热能引发岩石圈地幔和上覆地壳发生部分熔融,形成以壳源为主的壳幔混源岩浆,在弧后拉张环境下上侵形成。 |
| 关 键 词： | 地球化学 LA-ICP-MS U-Pb年龄 侵入岩 滚纠铁矿 尼雄矿田 西藏措勤 |
| 收稿时间： | 5/4/2011 12:00:00 AM |
| 修稿时间： | 2011/6/30 0:00:00 |
Zircon LA-ICP-MS U-Pb dating and geochemistry of intrusive rocks from Gunjiu iron deposit in the Nixiong ore field, Coqen, Tibet |
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| YU YuShuai,GAO Yuan,YANG ZhuSen,TIAN ShiHong,LIU YingChao,CAO ShengHu,HU WeiZheng and QIE HaiMan.Zircon LA-ICP-MS U-Pb dating and geochemistry of intrusive rocks from Gunjiu iron deposit in the Nixiong ore field, Coqen, Tibet[J].Acta Petrologica Sinica,2011,27(7):1949-1960. | |
| Authors: | YU YuShuai GAO Yuan YANG ZhuSen TIAN ShiHong LIU YingChao CAO ShengHu HU WeiZheng and QIE HaiMan |
| Institution: | Wuhan Institute of Geology and Mineral Resources, Wuhan 430205, China;China Institute of Mineral Resources, CAGS, Beijing 100037, China;Jiangxi Institute of Geology Survey, Nanchang 330201, China;China Institute of Mineral Resources, CAGS, Beijing 100037, China;China Institute of Mineral Resources, CAGS, Beijing 100037, China;Institute of Geology, CAGS, Beijing 100037, China;Jiangxi Institute of Geology Survey, Nanchang 330201, China;Jiangxi Institute of Geology Survey, Nanchang 330201, China;Jiangxi Institute of Geology Survey, Nanchang 330201, China |
| Abstract: | Whole-rock major and trace elements, zircon LA-ICP-MS U-Pb age of granodiorite and monzogranite from Gunjiu iron deposit in the Nixiong ore field, which are associated with the Fe mineralization, are analyzed in this paper. The major elements result show that both rocks are enriched in silica and alkali (with the average of SiO2 66.76 %, 70.98% and ALK 6.28%, 7.70%). The aluminum saturation index are both less than 1.1. The rocks are belonged to medium-high K calc-alkaline I-type granite. There have similar... |
| Keywords: | Geochemistry LA-ICP-MS U-Pb dating Intrusive rocks Gunjiu iron deposit Nixiong ore field Coqen Tibet |
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