[1]韩建军.2018.柴北缘牛鼻子梁地区花岗闪长质岩体锆石U-Pb年龄、地球化学特征及地质意义.大地构造与成矿学,优先出版:157-170.doi:10.16539/j.ddgzyckx.2020.01.009
 HAN Jianjun,SONG Chuanzhong.2018.Zircon U-Pb Age, Geochemistry and Geological Significance of the Granodioritic Intrusive Rocks in the Niubiziliang Area, Northern Qaidam Basin.Geotectonica et Metallogenia,优先出版:157-170.doi:10.16539/j.ddgzyckx.2020.01.009
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柴北缘牛鼻子梁地区花岗闪长质岩体锆石U-Pb年龄、地球化学特征及地质意义
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《大地构造与成矿学》[ISSN:ISSN 1001-1552/CN:CN 44-1595/P]

卷:
期数:
2018年优先出版
页码:
157-170
栏目:
出版日期:
2020-12-30

文章信息/Info

Title:
Zircon U-Pb Age, Geochemistry and Geological Significance of the Granodioritic Intrusive Rocks in the Niubiziliang Area, Northern Qaidam Basin
作者:
韩建军1 2 宋传中2 何 俊3 祁昌炜1 韩 旭2 刘会文4
(1.青海省地质调查局, 青海 西宁 810001; 2.合肥工业大学 资源与环境工程学院, 安徽 合肥 230009; 3.中国科学技术大学 地球和空间科学学院, 安徽 合肥 230026; 4.青海省核工业地质局, 青海 西宁 810008)
Author(s):
HAN Jianjun1 2 SONG Chuanzhong2 HE Jun3 QI Changwei1 HAN Xu2 and LIU Huiwen4
(1. Qinghai Geological Survey, Xining 810001, Qinghai, China; 2. School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, Anhui, China; 3. School of earth and space sciences, University of Science and Technology of China, Hefei 230026, Anhui, China; 4. Qinghai Geological Survey of Nuclear Industry, Xining 810008, Qinghai, China)
关键词:
花岗闪长质岩体 锆石U-Pb年龄 岩石地球化学 地质意义 牛鼻子梁
Keywords:
granodioritic intrusive rocks zircon U-Pb age geochemistry geological significance Niubiziliang area
DOI:
10.16539/j.ddgzyckx.2020.01.009
文献标志码:
A
摘要:
柴北缘牛鼻子梁地区出露大面积花岗闪长质侵入岩, 包括英云闪长岩、闪长岩、角闪闪长岩, 本文对三者进行了锆石U-Pb定年, 结合全岩地球化学特征, 探讨了英云闪长岩的岩石成因、形成时代及构造环境。LA-ICP-MS锆石U-Pb测年分析获得英云闪长岩、闪长岩和角闪闪长岩的206Pb/238U加权平均年龄分别为346±0.78 Ma、343±1.0 Ma和338±1.0 Ma, 限定了岩体的结晶时代为早石炭世。英云闪长岩的分布最广泛, 其地球化学研究显示具有I型花岗岩的特征: ①A/CNK都小于1, K2O/Na2O比值小于1, 显示具准铝质富钠的特征; ②全碱含量(Na2O+K2O)介于4.83%~6.53%, 里特曼指数(σ)在2.32左右, 表现为钙碱性; ③轻稀土富集, 重稀土分馏程度较低, 基本无Eu异常; ④高Sr、低Y, 富集K、Rb、La等元素, 亏损Nb、Ta、Ba、Ti、P等元素; ⑤P2O5与SiO2具有明显的负相关性。综合研究成果, 认为英云闪长岩是来自下地壳物质部分熔融, 属于晚古生代(早石炭世)柴达木地块与祁连地块的俯冲碰撞后的伸展环境下岩浆活动的产物。
Abstract:
A large area of granodioritic intrusive rocks, including the tonalite, diorite and hornblende diorite, are exposed in the Niubiziliang area of the north Qaidam Basin. This paper identifies zircon U-Pb dating for the three, and the rock genesis, age and tectonic setting of tonalite were discussed in combination with the geochemical characteristics of the rock. LA-ICP-MS zircon U-Pb dating analysis obtained 206Pb/238U weighted mean ages of tonalite, diorite and hornblende diorite are 346±0.78 Ma, 343±1.0 Ma, and 338±1.0 Ma, which defines the crystallization age of rocks is Early Carboniferous. The tonalite is the most widely distributed in the Niubiziliang area, and its geochemical studies show the characteristics of I-type granite: ①A/CNK is less than 1, and K2O/Na2O ratio is less than 1, indicating the characteristics of quasi-aluminum sodium-rich; ②The content of (Na2O+K2O) is between 4.83% and 6.53%, the Litman index (σ) is about 2.32, which is characterized by calc-alkaline; ③Light rare earth is enriched, heavy rare earth fractionation is low, no Eu abnormality; ④High Sr, low Y, enriched elements such as K, Rb, La etc., depleted Nb, Ta, Ba, Ti, P etc. ⑤There is a negative correlation between P2O5 and SiO2. Based on the comprehensive research, the tonalite is a product of partial melting from the lower crust, which belongs to the product of magmatic activity in the extended environment in the Late Paleozoic (the Early Carboniferous) after the subduction collision Qaidam block and the Qilian block.

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更新日期/Last Update: 2019-12-05