Petrogenesis and geological significance of Late Mesoproterozoic gabbro in the western Yangtze Block: Constrains from zircon U-Pb-Hf isotopes and whole-rock geochemistry

XUE Wenbin; LAI Shaocong; ZHU Yu; QIN Jiangfeng; ZHU Renzhi; LIU Min; YANG Hang

doi:10.16152/j.cnki.xdxbzr.2024-04-012

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Petrogenesis and geological significance of Late Mesoproterozoic gabbro in the western Yangtze Block: Constrains from zircon U-Pb-Hf isotopes and whole-rock geochemistry

更新时间：2024-08-01

- Petrogenesis and geological significance of Late Mesoproterozoic gabbro in the western Yangtze Block: Constrains from zircon U-Pb-Hf isotopes and whole-rock geochemistry
- Journal of Northwest University (Natural Science Edition) Vol. 54, Issue 4, Pages: 696-714(2024)
- 作者机构：
  
  西北大学　地质学系/大陆动力学国家重点实验室，陕西　西安　710069
- 作者简介：
- 基金信息：
- DOI：10.16152/j.cnki.xdxbzr.2024-04-012
  CLC： P588.1
- Published：25 August 2024，
  
  Received：26 April 2024，
- 稿件说明：
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XUE Wenbin, LAI Shaocong, ZHU Yu, et al. Petrogenesis and geological significance of Late Mesoproterozoic gabbro in the western Yangtze Block: Constrains from zircon U-Pb-Hf isotopes and whole-rock geochemistry. [J]. Journal of Northwest University (Natural Science Edition) 54(4):696-714(2024)
DOI：

XUE Wenbin, LAI Shaocong, ZHU Yu, et al. Petrogenesis and geological significance of Late Mesoproterozoic gabbro in the western Yangtze Block: Constrains from zircon U-Pb-Hf isotopes and whole-rock geochemistry. [J]. Journal of Northwest University (Natural Science Edition) 54(4):696-714(2024) DOI： 10.16152/j.cnki.xdxbzr.2024-04-012.

摘要

对扬子地块西缘锦川地区辉长岩进行系统的锆石U-Pb-Hf同位素、全岩主微量元素和Sr-Nd同位素分析，旨在探讨其岩石成因及地质意义。年代学分析结果表明，锦川辉长岩的锆石U-Pb年龄为（1 041.1±1.1）Ma。全岩地球化学特征显示，锦川辉长岩具有较低的SiO

（50.26%~ 51.16%）、CaO（6.59%~7.64 %）、K

O（1.22%~1.96%）质量分数以及较高的Al

（16.38%~17.15%）和TiO

（2.61%~2.80%）质量分数，属于低钾拉斑玄武质岩石系列。岩石总体上相对富集轻稀土元素和大离子亲石元素（如Ba、Sr），亏损重稀土元素和高场强元素（如Nb、Ta和Th），并且显示弱的Eu异常（δEu=0.99 ~ 1.11）。同时，锦川辉长岩具有低的全岩εNd（t）值（－3.61~－2.75）和正的锆石εHf（t）值（＋1.62 ~＋7.58）。上述特征表明，锦川辉长岩应起源于已保存在岩石圈地幔中的先期（中元古代中期）俯冲流体交代过的富集地幔源区。结合扬子地块西缘同期广泛发育的A型花岗岩和板内玄武质岩浆作用，认为锦川辉长岩应形成于被动大陆边缘背景下的陆内裂谷环境，代表了Rodinia超大陆在中元古代晚期局部拉张构造体制下的岩浆响应。

Abstract

This stud

y presents systematic analysis of zircon U-Pb-Hf isotopes

whole-rock major and trace elements

and Sr-Nd isotopes of the Jinchuan gabbros

aiming to explore its petrogenesis and geological significance. The Jinchuan gabbros has Zircon U-Pb age of 1 041.1±1.1 Ma

it has moderate SiO

(50.26% to 51.16%)

CaO (6.59% to 7.64 %)

O (1.22% to 1.96%) contents

with high Al

(16.38% to 17.15%) and TiO

(2.61% to 2.80%) contents

belonging to low-K tholeiite rocks. These gabbros were enriched in light rare earth elements and large ionic lithophile elements (e.g.

Sr)

as well as depleted in heavy rare earth elements and high field strength elements (e.g.

Th)

with weak Eu anomalies (δEu=0.99 to 1.11).They have negative εNd(t) values (-3.61 to-2.75) and positive zircon εHf(t) (+ 1.62 to+ 7.58) contents.These geochemical features indicate the Jinchuan gabbros were originated from the enriched mantle source that metasomatized by middle Mesoproterozoic subduction fluids preserved in the lithosphere mantle. Combined with the coeval A-type granites and intra-plate basaltic magmatism

the Jinchuan gabbros formed in an intracontinental rift environment under a passive continental margin

representing the magmatic response of the Rodinia supercontinent under local extensional tectonic mechanism during the late Mesoproterozoic.

关键词

扬子地块西缘中元古代晚期辉长岩岩石成因地质意义

Keywords

western Yangtze BlockLate Mesoproterozoicgabbropetrogenesisgeological implications

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