[1]解世雄,任 龙,张 健.2020.北秦岭地体西段草滩沟群流纹岩的成因及其地质意义.大地构造与成矿学,44(6):1239-1257.doi:10.16539/j.ddgzyckx.2020.06.014
　XIE Shixiong,REN Long,ZHANG Jian.2020.Petrogenesis of the Caotangou Group Rhyolite in the Western Part of North Qinling Terrane and its Geological Implication.Geotectonica et Metallogenia,44(6):1239-1257.doi:10.16539/j.ddgzyckx.2020.06.014
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北秦岭地体西段草滩沟群流纹岩的成因及其地质意义
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《大地构造与成矿学》[ISSN:ISSN 1001-1552/CN:CN 44-1595/P]

卷:
期数:
2020年44卷06期
页码:
1239-1257
栏目:
岩石大地构造与地球化学
出版日期:
2020-12-20

文章信息/Info

Title:
Petrogenesis of the Caotangou Group Rhyolite in the Western Part of North Qinling Terrane and its Geological Implication
文章编号:
1001-1552(2020)06-1239-019
作者:
解世雄1、2;  任 龙1、2;  张 健1、2;  包志伟1;  梁华英1*
1.中国科学院 广州地球化学研究所 矿物学与成矿学重点实验室, 广东 广州 510640; 2.中国科学院大学, 北京 100049
Author(s):
XIE Shixiong1、2;  REN Long1、2;  ZHANG Jian1、2;  BAO Zhiwei1 and LIANG Huaying1*
1. Key Laboratory of Mineralogy and Metallogeney, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, Guangdong, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China
关键词:
草滩沟群;  地球化学;  板片后撤;  大陆碰撞;  北秦岭地体
Keywords:
Caotangou Group;  geochemistry;  slab roll-back;  continental collision;  North Qinling terrane
分类号:
P595; P597
DOI:
10.16539/j.ddgzyckx.2020.06.014
文献标志码:
A
摘要:
秦岭造山带发育一套与大洋俯冲有关的早古生代火山岩, 该火山岩套中赋存有大量VMS型Pb-Zn矿床。目前, 对这些赋矿火山岩形成的地球动力学背景仍存在争议。本文对北秦岭地体西段老厂地区的草滩沟群长英质火山岩(流纹岩)进行了锆石U-Pb定年、全岩主微量元素和Sr-Nd-Hf同位素分析。研究显示, 老厂地区草滩沟群流纹岩的LA-ICP-MS锆石U-Pb年龄为435±2.9 Ma, 与北部相邻的早古生代清水?红土堡火山岩的年龄相近。岩石具有高SiO2和Na2O, 低K2O和TiO2的特征, 属于准铝质低钾拉斑系列; 微量元素显示亏损高场强元素(HFSEs: Ti、Nb和Ta)、富集大离子亲石元素(LILEs: Sr、U和Ba), 显示岛弧岩浆的特征; 具有富集的Sr-Nd-Hf同位素组成((87Sr/86Sr)i=0.70612~0.70647, εNd(t)=1.03~1.61, εHf(t)=7.63~7.96), 综合判别其形成于岛弧环境, 岩浆源区为经历了俯冲洋壳脱水流体交代的富集地幔楔。结合北秦岭地体北部同时代的清水?红土堡弧后盆地火山岩研究, 暗示大洋板片后撤(下沉)引发的软流圈对流循环控制了草滩沟群火山岩和相关的VMS型铅锌矿床的形成。此外, 这些火山岩及北秦岭地体西段奥陶纪?志留纪变质作用和岩浆作用的年龄也说明华北板块和华南板块在秦岭造山带的早古生代大陆碰撞很可能发生于433 Ma。
Abstract:
The early Paleozoic subduction-related volcanic rocks in the Qinling orogenic belt host a large number of volcanogenic massive sulfide (VMS) deposits. However, the geodynamic setting of these volcanic rocks and related deposits is still controversial. In this paper, a combined study of zircon U-Pb age, whole-rock major and trace elements, and whole-rock Sr-Nd-Hf isotope compositions was carried out for the Caotangou Group rhyolites. Zircon U-Pb dating yielded a mean age of 435±2.9 Ma, which is similar to that of the Early Paleozoic Qingshui-Hongtubu volcanic rocks in the western part of the North Qinling terrane. The Caotangou Group rhyolites belong to metaluminous and low-K tholeiitic series, and are characterized by enriched large ion lithophile elements (Sr, U and Ba) and depleted high field-strength elements (Ti, Nb and Ta). The major and trace element signatures and enriched Sr-Nd-Hf isotopic compositions ((87Sr/86Sr)i = 0.70612 - 0.70647, εNd(t) = 1.03 - 1.61, εHf(t) = 7.63 - 7.96) imply that the Caotangou Group rhyolites were formed in an island arc environment and sourced from an enriched mantle wedge hybridized by slab-derived fluids. Integrated with the contemporary Qingshui-Hongtubu volcanic rocks located in the northern part of the North Qinling terrane, the crystallization age and isotopic compositions of the Caotangou Group volcanic rocks indicate that the asthenospheric convection triggered by slab rollback controlled the formation of the Caotangou Group volcanic rocks and related VMS-type Pb-Zn deposits. Besides, the geochronological data of the studied volcanic rocks and the Ordovician-Silurian metamorphism and magmatism in the western part of the North Qinling Terrane suggest that the early Paleozoic initial continental collision of the North China Craton and South China Block in the Qinling orogenic belt likely occurred at ca. 433 Ma.

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备注/Memo

备注/Memo:
收稿日期: 2019-05-10; 改回日期: 2019-07-31
项目资助: 国家自然科学基金项目(41772065、41421062)和中陕核广州地球化学研究所合作项目联合资助。
第一作者简介: 解世雄(1992-), 男, 博士研究生, 矿物学、岩石学、矿床学专业。Email: 875793511@qq.com
通信作者: 梁华英(1962-), 男, 研究员, 博士生导师, 从事矿床地质及矿床地球化学研究。Email: lianghy@gig.ac.cn
更新日期/Last Update: 2020-12-20