| 西藏过铝花岗岩锆石群型的成因信息 |
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| 引用本文： | 廖忠礼,莫宣学,潘桂棠,朱弟成,王立全,赵志丹.西藏过铝花岗岩锆石群型的成因信息[J].大地构造与成矿学,2006,30(1):63-71. |
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| 作者姓名： | 廖忠礼 莫宣学 潘桂棠 朱弟成 王立全 赵志丹 |
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| 作者单位： | 1. 成都地质矿产研究所,四川,成都,610082
2. 中国地质大学,北京,100083 |
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| 基金项目： | 国家自然科学基金，中国地质调查局资助项目，教育部重点实验室基金 |
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| 摘 要： | 锆石是西藏过铝花岗岩最重要的副矿物,为了探讨过铝花岗岩的成因,对西藏过铝花岗岩体中的锆石含量、晶体形态和群型分布特征进行了研究,结果表明,可明显分出5种锆石晶体形态;锆石主要在过铝环境条件下,岩浆结晶温度较低时形成,结晶范围为600～900℃,其中冈底斯带结晶温度高于喜马拉雅带。不同构造-岩浆带锆石群型特征反映的成因信息不同,喜马拉雅带为壳源成因,而冈底斯带除了壳源成因之外,还有幔源成分的加入,反映了青藏高原岩石圈组成和演化的不均一性。
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| 关 键 词： | 过铝花岗岩 副矿物 锆石群型 岩石成因 西藏 |
| 文章编号： | 1001-1552(2006)01-0063-09 |
| 收稿时间： | 2005-04-19 |
| 修稿时间： | 2005-07-31 |
CHARACTERISTICS AND IMPLICATION OF THE TOPOLOGY OF ZIRCONS FROM THE PERALUMINOUS GRANITES IN TIBET |
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| LIAO Zhongli,MO Xuanxue,PAN Guitang,ZHU Dicheng,WANG Liquan,ZHAO Zhidan.CHARACTERISTICS AND IMPLICATION OF THE TOPOLOGY OF ZIRCONS FROM THE PERALUMINOUS GRANITES IN TIBET[J].Geotectonica et Metallogenia,2006,30(1):63-71. |
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| Authors: | LIAO Zhongli MO Xuanxue PAN Guitang ZHU Dicheng WANG Liquan ZHAO Zhidan |
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| Institution: | 1. Chengdu Institute of Geology and Mineral Resources, Chengdu, SC 610082, China; 2. China University of Geosciences, Beijing 100083, China |
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| Abstract: | Zircon is an important accessory mineral in Tibet peraluminous granites. In order to discuss the petrogenesis of peraluminous granites, zircon content, crystal form and the features of zircon group minerals in the Tibet peraluminous granites were studied in detail in this paper. As a result, five zircon crystal forms have been identified. Tibet peraluminous granites are formed in peraluminous setting conditions and originated at low crystallization temperature, ranging between 600 ℃~900 ℃, in magma chamber. The crystallization temperature for Gandese belt is higher than that for the Himalayan belt. The features of zircon groups in different tectonic belts yield different information on petrogenesis. The Himalayan belt is regarded as the crust source petrogenesis type, while for the Gandese belt mantle addition of source composition was expected for its crust source petrogenesis. These diferences show inhomogeneity of lithosphere composition and evolution of Tibet Plateau. |
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| Keywords: | peraluminous granite accessory mineral zircon topology petrogenesis Tibet |
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