新疆准噶尔北东缘乌图布拉克岩体形成时代、地球化学特征及地质意义

周刚; 吴淦国; 董连慧; 张招崇; 董永观; 童英; 何立新; 应立娟

新疆准噶尔北东缘乌图布拉克岩体形成时代、地球化学特征及地质意义

- 1.
  中国地质大学地球科学与资源学院，北京 100083；新疆维吾尔自治区地质矿产勘查开发局第四地质大队，阿勒泰 836500
- 2.
  中国地质大学地球科学与资源学院，北京 100083
- 3.
  中国地质大学地球科学与资源学院，北京 100083；新疆维吾尔自治区地质矿产勘查开发局，乌鲁木齐 830000
- 4.
  南京地质矿产研究所，南京 210016
- 5.
  中国地质科学院地质研究所，北京 100037
- 6.
  新疆维吾尔自治区地质矿产勘查开发局第四地质大队，阿勒泰 836500
- 7.
  中国地质科学院矿产资源研究所，北京 100037
基金项目:
国家305项目（2007BAB25B01）和国家自然科学基金项目（40702010）

收稿日期: 2008-09-30

修回日期: 2008-11-07

刊出日期: 2009-06-30

Formation time and geochemical feature of Wutubulak pluton in the northeastern margin of Junggar in Xinjiang and its geological significance

- 1.
  Faculty of Earth Resources, China University of Geosciences, Beijing 100083, China;No.4 Geological Team of Xinjiang Bureau of Geology and Mineral Resources, Altay 836500, China
- 2.
  Faculty of Earth Resources, China University of Geosciences, Beijing 100083, China
- 3.
  Faculty of Earth Resources, China University of Geosciences, Beijing 100083, China; Xinjiang Bureau of Geology and Mineral Resources, Urumqi 830000, China
- 4.
  Nanjing Institute of Geology and Mineral Resources, Nanjing 210016, China
- 5.
  Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
- 6.
  No.4 Geological Team of Xinjiang Bureau of Geology and Mineral Resources, Altay 836500, China
- 7.
  Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

Received Date: 30 September 2008

Revised Date: 07 November 2008

Publish Date: 30 June 2009

摘要

摘要: 乌图布拉克岩体位于准噶尔北东缘，额尔齐斯-玛因鄂博构造带南侧。岩体主要由花岗闪长岩和二长花岗岩组成，有少量石英闪长岩和钾长花岗岩。岩体的锆石SHRIMP U-Pb年龄为360.1±3.6Ma。岩石的K2O+Na2O=7.05%~9.48%，A/NKC=0.91~1.04，属准铝-过铝质“I”型花岗岩。岩石稀土总量低，∑REE为72×10-6~184×10-6，轻稀土富集，(La/Yb)N=5~13。石英闪长岩、花岗闪长岩、二长花岗岩具弱的铕负异常或无明显异常（δEu=0.72~0.98）；钾长花岗岩铕负异常明显（δEu=0.15~0.21）。在微量元素配分模式中，具有Sr、Ba、P、Ti的亏损，而Nb、Ta亏损不明显。岩石有低的Sr初始值（0.70165~0.70462）和高的εNd(t)u（+4.7~+6.9）。2个样品的Nd模式年龄分别为758Ma和551Ma。上述特征表明，岩浆可能具有较复杂的来源，推测该岩体岩浆可能来源于年轻的玄武质地壳，并有幔源物质的加入。综合本文资料及区域地质特征分析，阿尔泰造山带后碰撞时限可能为360~290Ma，即泥盆纪末-石炭纪末。
- 乌图布拉克岩体 /
- 锆石SHRIMP /
- U-Pb年龄 /
- 地球化学 /
- 后碰撞时限 /
- 准噶尔北东缘
Abstract: The Wutubulak pluton is located in the northeastern margin of Junggar and the southern side of the Ertrix-Mayinebo tectonic belt. This pluton is composed of granodiorite and monzogranite, and a few of quartz diorite and moyite. Zircon SHRIMP U-Pb age of this pluton is 360.1±3.6Ma. It’s K2O+Na2O content reaches 7.05%~9.48%. The A/NKC value (0.91~1.04) indicates it belongs to the metaluminous and prealuminous as “I”type granite. REE content is quite low, so that its ∑REE changes only between 72×10-6 and 184×10-6 with a richenment of light REE as (La/Yb)N value between 5 and 13. There is a slight negative Eu anomaly or no obvious Eu anomaly of quartz diorite, granodiorite and monzogranite (δEu 0.72~0.98), whereas moyite contains an obvious negative Eu anomaly (δEu 0.15~0.21). Incompatible elements such as Rb, Th, K are richened, Sr, Ba, P and Ti are poor and the deficiency of Nb and Ta is not obvious. Initial Sr value changes between 0.70165 and 0.70462, and its εNd(t)u is positive as +4.7~+6.9. Mode ages of two samples are 758Ma and 551Ma. These suggest the magmatic sources are complex, may from new basaltic crust, and with the additional mixture of young mantle-source material. Based on the previous research work, time limit of post-collision of Altay orogen might be between 360Ma and 290Ma, namely between the end of Devonian and the end of Carboniferous.
- Wutubulak pluton /
- Zircon SHRIMP U-Pb dating /
- Geochemistry /
- Time limit of post-collision /
- The northeastern margin of Junggar /

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新疆准噶尔北东缘乌图布拉克岩体形成时代、地球化学特征及地质意义

Formation time and geochemical feature of Wutubulak pluton in the northeastern margin of Junggar in Xinjiang and its geological significance

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