西天山巴尔盖提花岗岩体年龄、地球化学特征与构造意义

高山林

doi:10.11781/sysydz201703362

西天山巴尔盖提花岗岩体年龄、地球化学特征与构造意义

doi: 10.11781/sysydz201703362

高山林

中国石化石油勘探开发研究院, 北京 100083

基金项目: 中国石化油田部项目“海域盆地勘探动态跟踪及选区评价部署研究”（G5800-16-ZS-YTB025）资助。

详细信息

作者简介:
高山林(1966-),男,高级工程师,从事油气盆地构造分析。E-mail:gaosl.syky@sinopec.com。

中图分类号: TE121.2
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出版历程
- 收稿日期: 2016-12-25
- 修回日期: 2017-03-25
- 刊出日期: 2017-05-28

Geochronology, geochemical properties and tectonic significance of Baergaiti granitoid in western Tianshan Mountain, NW China

Gao Shanlin

SINOPEC Petroleum Exploration and Production Research Institute, Beijing 100083, China

摘要

摘要: 巴尔盖提花岗岩体位于伊犁盆地北缘西天山博罗霍洛构造带。锆石LA-ICP-MS U-Pb年龄（374±7.0）Ma显示岩体侵位于晚泥盆世。岩石为斑状黑云母花岗岩，其主量元素SiO₂、Al₂O₃、K₂O、Na₂O的含量分别为70.72%~79.12%，9.87%~14.51%，4.13%~5.54%，2.87%~4.35%，富碱、高钾、低镁钛，属高钾钙碱性系列；轻稀土相对富集，（La/Yb）_N为7.61~16.31，具有显著的负Eu异常；相对富集大离子亲石元素Rb、U和Th等，亏损Nb、Ta和Ti等高场强元素，地球化学特征总体显示了I-A花岗岩过渡特征。区域上地层不整合关系、沉积特征及地球化学构造图解特征综合分析表明，巴尔盖提花岗岩体形成于晚泥盆世区域性造山后伸展背景，与石炭纪火山-沉积建造构成了晚古生代完整的开合构造演化旋回。
- 巴尔盖提花岗岩体 /
- 锆石U-Pb年龄 /
- I-A型花岗岩 /
- 造山后伸展 /
- 西天山
Abstract: The Baergaiti granitoid is located in the Boluohuoluo tectonic belt in the western Tianshan Mountain of the Yili Basin. LA-ICP-MS zircon U-Pb shows age of 374±7.0 Ma, corresponding to the Late Devonian. Petrogeochemical analyses suggest that the intrusion belong to calc-alkaline metaliferous rocks characterized with high silica, potassium, and alkalinity, low magnesium and titanium. The contents of SiO₂, Al₂O₃, K₂O, Na₂O range 70.72%-79.12%, 9.87%-14.51%, 4.13%-5.54%, 2.87%-4.35%, respectively. Meanwhile, the REE contents show an obvious rich LREE pattern ((La/Yb)_N ranges 7.61-16.31) with negative Eu anomalies. Large ion lithophile elements such as Rb, Th and U are relatively enriched, whereas high strength field elements such as Nb, Ta and Ti are relatively depleted. Geochemical and isotope characteristics show a transition feature of high-K calc-alkaline I-A type granite. The analyses of a regional angular unconformity and sedimentary features suggest that the Baergaiti granitoid was deposited under a post-orogenic intra-continental extensional tectonic setting during the Late Devonian, and formed a complete tectonic evolution cycle coupling with the Carboniferous volcanic-sedimentary strata.
- Baergaiti granitoid /
- zircon U-Pb dating /
- I-A type granite /
- post-orogenic extension /
- western Tianshan

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