吉林大学学报(地球科学版) ›› 2019, Vol. 49 ›› Issue (2): 445-459.doi: 10.13278/j.cnki.jjuese.20170332

• 地质与资源 • 上一篇    下一篇

北秦岭二郎坪岩体锆石U-Pb定年、地球化学特征及其地质意义

梁涛1,2, 卢仁1,2, 王莉1,2   

  1. 1. 河南省有色金属地质勘查总院, 郑州 450052;
    2. 河南省有色金属深部找矿勘查技术研究重点实验室, 郑州 450052
  • 收稿日期:2017-12-21 出版日期:2019-03-26 发布日期:2019-03-28
  • 作者简介:梁涛(1979-),男,高级工程师,博士,主要从事花岗岩成因及地质找矿研究工作,E-mail:liang20010212@126.com
  • 基金资助:
    国家自然科学基金项目(U1504405);河南省基础与前沿技术研究计划(162300410065);河南省国土资源厅科技攻关项目(2016-08,2014-06)

LA-ICP-MS Zircon U-Pb Dating, Geochemiacal Features and Geological Significance of Erlangping Rock Mass in North Qinling Mountains

Liang Tao1,2, Lu Ren1,2, Wang Li1,2   

  1. 1. Henan Nonferous Metals Geological Exploration Institute, Zhengzhou 450052, China;
    2. Key Laboratory of Deep Ore-Prospecting Technology Research for Non-Ferrous Metals of Henan Province, Zhengzhou 450052, China
  • Received:2017-12-21 Online:2019-03-26 Published:2019-03-28
  • Supported by:
    Supported by National Natural Science Foundation of China(U1504405), Basic and Frontier Research Plan of Henan Province (162300410065) and Science and Technology Key Project of Bereau of Land and Resources of Henan Province (2016-08, 2014-06)

摘要: 二郎坪岩体位于北秦岭构造带的东部,主体岩性为斑状黑云母二长花岗岩,对其开展锆石精确定年和地球化学成因研究有助于深入认识晚中生代北秦岭的深部过程。LA-ICP-MS锆石U-Pb定年结果表明,二郎坪岩体的形成时代为(114.0±0.5)Ma(MSWD=1.5),属于早白垩世晚期。二郎坪岩体富硅、碱和贫钙、镁,属于高钾钙碱性系列;并富集Rb、Th和亏损Nb、Sr、P、Ti,稀土配分模式具有右倾、轻稀土富集、重稀土亏损和负Eu异常的特征,(La/Yb)N范围为8.39~13.73,源区组成和部分熔融程度控制了二郎坪岩体的成分变异。二郎坪岩体形成于厚度约为40 km的地壳内,部分熔融源区位于角闪岩相,源区残余相主要矿物为角闪石和斜长石。烟镇区域岩石圈约在130 Ma经历拆沉作用,触发二郎坪深部的岩浆底侵作用,使源区岩石部分熔融并与之混合,上侵至地壳浅部最终在约114 Ma固结成岩,二郎坪岩体是烟镇区域岩石圈拆沉作用滞后约15 Ma的产物。

关键词: 二郎坪岩体, U-Pb定年, 岩石圈拆沉, 岩浆混合, 底侵作用, 北秦岭

Abstract: Erlangping rock mass is in the east of Northern Qinling Mountains, and composed of porphyritic biotite monzonitic granite. The zircon U-Pb dating and geochemical features of Erlangping rock mass are significant to recognize the deep tectonic evolution of the northern Qinling Mountains in Late Mesozoic. The LA-ICP-MS zircon U-Pb dating results show that the formation age of Erlangping rock body is (114.0±0.5) Ma (MSWD=1.5). Erlangping rock mass is characterized by higher SiO2 and alkali, and lower MgO and CaO, and compositional spots fall into the high-K calc-alkaline series in the SiO2-K2O diagram. Erlangping rock mass are enriched in large ion lithophile elements and depleted of high field-strength elements, which formed peaks of Rb and Th, and troughs of Nb,Sr, P and Ti in spider diagram. In the chondrite-normalized REE patterns, Erlangping rock mass shows the characteristics of LREE-enrichment and HREE depletion with Eu negative anomaly, and the (La/Yb)N ratios are from 8.39 to 13.73. It suggests that the compositional change of Erlangping rock mass is controlled mainly by source composition and degree of partial melting. The partial melting source of Erlangping rock mass falls in amphibolite-facies with a crust thickness of about 40 km. The residual phases of partial melting source include mainly hornblende and plagioclase. Yanzhen regional lithosphere delamination took place in about 130 Ma, which triggered the deep magma intrusion in Erlangping area, and the later source rock partial melting and mixing with deep magma. They ascended and solidified in about 114 Ma. Erlangping rock mass is the product of delayed magmatism in about 15 Ma in response to the Yanzhen regional lithosphere delamination.

Key words: Erlangping body, U-Pb isotopic dating, lithosphere delamination, magma mixture, under plating, Northern Qinling Mountains

中图分类号: 

  • P597.3
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