太行山北段王安镇杂岩体岩石学、年代学、地球化学特征及地质意义

张海东; 刘建朝; 王金雅; 张苏楠; 胡波; 王得权; 韩松

太行山北段王安镇杂岩体岩石学、年代学、地球化学特征及地质意义

- 1.
  长安大学地球科学与资源学院, 西安 710054;西北大学地质学系, 西安 710069
- 2.
  长安大学地球科学与资源学院, 西安 710054
- 3.
  中陕核工业集团公司, 西安 710100
基金项目:
本文受国家自然科学基金项目(41402042、41002064)、中国地质调查局项目(12120114021001)和中央高校项目(CHD2011ZY005、310827152015、310827151057)联合资助.

收稿日期: 2015-03-20

修回日期: 2015-10-21

刊出日期: 2016-03-31

Petrology, geochronology and geochemistry characteristics of Wang'anzhen complex in the northern Taihang Mountain and their geological significance.

- 1.
  School of Earth Science and Resources, Chang'an University, Xi'an 710054, China;Department of Geology, Northwest University, Xi'an 710069, China
- 2.
  School of Earth Science and Resources, Chang'an University, Xi'an 710054, China
- 3.
  Zhongshan Nuclear Industry Group Company, Xi'an 710100, China

Received Date: 20 March 2015

Revised Date: 21 October 2015

Publish Date: 31 March 2016

摘要

摘要: 王安镇杂岩体主要由花岗闪长岩、二长花岗岩、花岗岩、石英闪长岩、二长闪长岩组成,LA-ICP-MS锆石U-Pb测年显示,花岗闪长岩和石英闪长岩分别形成于129±2.7Ma和128.3±1.9Ma,说明该杂岩体形成于早白垩世。王安镇杂岩体具有高Sr/Y比值(3.63~83.5),和高Sr(373×10-6~821×10-6),及低Y(7.36×10-6~22.21×10-6)、Yb(0.95×10-6~1.27×10-6)含量的地球化学特征,这与埃达克岩相似。该杂岩体具有相对低的87Sr/86Sr初始比值(0.706538~0.709484)和明显偏低的εNd(128Ma)值(-18.4~-12.8)。结合太行山中生代中-基性侵入岩中地幔包体已有的研究成果,认为具有高Sr/Y特征的王安镇杂岩体是在下地壳发生大规模拆沉的基础上,随着软流圈上涌其所携带的热促使加厚基性下地壳发生部分熔融,之后熔融岩浆在上升的过程中发生了角闪石的结晶分异和岩浆混合作用形成。
- 王安镇杂岩体 /
- 太行山北段 /
- 埃达克岩 /
- 基性下地壳 /
- 拆沉作用
Abstract: The Wang'anzhen complex in the northern Taihang Mountain mainly consist of granodiorite, monzonitic granite, granite, quartz diorite and monzodiorite. The LA-ICP-MS zircon U-Pb dating shows that the granodiorite and quartz diorites were crystallized at 129±2.7Ma and 128.3±1.9Ma, respectively, suggesting that the Wang'anzhen complex were formed in the Early Cretaceous. The Wang'anzhen complex are characterized by high Sr=373×10-6~821×10-6, Sr/Y=3.63~83.5, and low Y=7.36×10-6~22.21×10-6, Yb=0.95×10-6~1.27×10-6, similar to adakite. The Wang'anzhen complex have relatively low initial 87Sr/86Sr ratios(0.706538 to 0.709484) and εNd(t=128Ma) values(-18.4 to -12.8), with Nd model ages from 1.09Ga to 1.89Ga, indicating that they were mainly derived by partial melting of old continental crustal materials. Combined with the previous results about the mantle xenoliths entrained by the Mesozoic basic-intermediate intrusive rocks in the Taihang Mountains, We considered that the Wang'anzhen complex was originated from melting of ancient thickened mafic lower crust which was based on large-scale lower crust delaminated into the convecting mantle, triggered by heating from upwelling asthenosphere, subsequently fractionated(e.g. hornblende) and mixed with felsic magma during rising, produced rocks with high Sr/Y signature.
- Wanganzhen complex /
- Northern Taihang Mountains /
- Adakite rocks /
- Mafic lower crust /
- Delamination

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太行山北段王安镇杂岩体岩石学、年代学、地球化学特征及地质意义

Petrology, geochronology and geochemistry characteristics of Wang'anzhen complex in the northern Taihang Mountain and their geological significance.

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