Petrogenesis and magmatic evolution recorded by zircon for Early Eocene hornblende-rich mafic rocks in Xima area, Tengchong Block

ZHAO Shaowei; YANG Zihao; FANG Xiaoyu; WEN Tai; CHEN Jingyuan; LAI Shaocong; LI Zuochen

doi:10.16152/j.cnki.xdxbzr.2025-03-007

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Petrogenesis and magmatic evolution recorded by zircon for Early Eocene hornblende-rich mafic rocks in Xima area, Tengchong Block

更新时间：2025-06-26

- Petrogenesis and magmatic evolution recorded by zircon for Early Eocene hornblende-rich mafic rocks in Xima area, Tengchong Block
- Journal of Northwest University (Natural Science Edition) Vol. 55, Issue 3, Pages: 564-584(2025)
- 作者机构：
  
  1.长安大学　地球科学与资源学院，陕西　西安　 710054
  2.西北大学　大陆演化与早期生命全国重点实验室，陕西　西安　 710069
- 作者简介：
- 基金信息：
- DOI：10.16152/j.cnki.xdxbzr.2025-03-007
  CLC： P588.15
- Received：16 December 2024，
  
  Published：25 June 2025
- 稿件说明：
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ZHAO Shaowei, YANG Zihao, FANG Xiaoyu, et al. Petrogenesis and magmatic evolution recorded by zircon for Early Eocene hornblende-rich mafic rocks in Xima area, Tengchong Block[J]. Journal of northwest university (natural science edition), 2025, 55(3): 564-584.
DOI：

ZHAO Shaowei, YANG Zihao, FANG Xiaoyu, et al. Petrogenesis and magmatic evolution recorded by zircon for Early Eocene hornblende-rich mafic rocks in Xima area, Tengchong Block[J]. Journal of northwest university (natural science edition), 2025, 55(3): 564-584. DOI： 10.16152/j.cnki.xdxbzr.2025-03-007.

摘要

陆缘弧地壳中富角闪石镁铁质岩石是探索岛弧岩浆深部分异和演化的重要载体。选取腾冲地块昔马地区富角闪石镁铁质岩石系列，利用岩相学、全岩主微量和Sr-Nd同位素、锆石U-Pb定年、Lu-Hf同位素和微量元素特征，探讨其成因和演化过程。分析结果表明，昔马镁铁质岩石是早始新世（51.2~52.7 Ma）同源岩浆堆晶和分异的产物，辉长岩和角闪辉长岩是以堆晶矿物及少量粒间熔体固结的产物，其中，辉长岩以单斜辉石、斜长石和磁铁矿为主要堆晶矿物，角闪辉长岩以斜长石、单斜辉石、磷灰石和榍石为主要堆晶矿物，而闪长岩则是以演化熔体为主的固结产物，并且在堆晶分异过程中，批次岩浆补给导致堆晶矿物（如斜长石）的溶解-再沉淀。锆石形态学、矿物包裹体组合和微量元素特征表明，镁铁质岩浆中早期结晶的斜长石±斜方辉石有助于锆石在镁铁质岩浆中的结晶，且较大的锆石结晶温度范围指示了锆石长时间的结晶，其微量元素有规律的变化表明镁铁质岩浆中结晶的锆石能够有效记录岩浆的结晶和分异演化过程。

Abstract

The hornblende-rich mafic rocks exposed in the continental arc is a key object to research differentiation and evolution of arc magmatism in the depth. This paper selected a series of hornblende-rich mafic rocks in Xima area

Tengchong Block to discuss their petrogenesis and evolved process

using the petrography

whole rock major and trace elements

Sr-Nd isotopic compositions

zircon U-Pb dating

Lu-Hf isotopic compositions and trace elements. The age data and isotopic compositions show that the mafic rocks in Xima area are accumulation and differentiation products of homogeneous magma in the Early Eocene (51.2~52.7 Ma). The accumulated minerals of gabbro are dominated by clinopyroxene

plagioclase and magnetite；and the plagioclase

clinopyroxene

titanite and apatite are the major of accumulated minerals for hornblende gabbro. The diorite is predominated by crystallization of crystal-poor evolved melt. The recharge of batch magma resulted in the dissolution and reprecipitation of accumulated minerals during the differentiation

such as plagioclase. The morphology

mineral inclusions and trace element of zircons suggest the early crystallization of plagioclase ± orthopyroxene assemblage in the mafic magma could promote the crystallization of zircon in the interaction face between mineral and melt. The wide range of zircon crystallization temperature shows long-time crystallization and the regularvariations of trace elements reflect that zircon crystallized in mafic magma could record crystallization and differentiation processes of mafic magmaefficiently.

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references

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