腾冲地区新生代高钾钙碱性火山岩结构组成及形成过程

doi:10.3799/dqkx.2025.173

腾冲地区新生代高钾钙碱性火山岩结构组成及形成过程

doi: 10.3799/dqkx.2025.173

江涛^1,2,
郑建平^2, ,,
苏玉平^1,2,
杨志国¹,
李鑫³

1. 新疆工业学院自然资源科技学院, 新疆和田县, 848000;
2. 中国地质大学(武汉)地球科学学院, 地质过程与成矿预测全国重点实验室, 湖北武汉, 430074;
3. 新疆维吾尔自治区地质局和田地质大队, 新疆和田, 848000

基金项目:

国家重点研发计划(2023YFF0804404)

国家自然科学基金项目(No.42320104001)联合资助

详细信息

作者简介:
江涛(1998—），男，硕士研究生，主要从事岩石学、矿物学研究..Email:Jiangt357@outlook.com.ORCID:0009-0003-2073-3594

通讯作者:
郑建平，教授，主要研究深源岩石和岩石圈演化.Email:jpzheng@cug.edu.cn

中图分类号: P581
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出版历程
- 收稿日期: 2025-05-06
- 网络出版日期: 2025-09-08

The structure composition and formation process of Cenozoic high-K calc-alkaline volcanic rocks in Tengchong area

1. School of Natural Resources Science and Technology, Xinjiang University of Technology, Hotan County, Xinjiang, 848000, China;
2. School of Earth Sciences, State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan, 430074, China;
3. Hotan Geological Brigade of Xinjiang Uygur Autonomous Region Geological Bureau, Hotan, Xinjiang, 848000

摘要

摘要: 腾冲地区新生代以来，发育大量高钾钙碱性火山岩（玄武质粗面安山岩和粗面安山岩），但具体形成过程尚不明确。本文基于岩相学分析，对这些火山岩进行全岩主量、矿物主微量元素分析，并结合文献已发表数据，探讨其形成演化过程。岩石普遍具斑状结构，斑晶以橄榄石、辉石和斜长石为主，并发育聚斑晶。单斜辉石斑晶常见正环带、反环带及振荡环带，其中振荡环带指示岩浆演化过程中多批次基性岩浆补给混合和可能的局部混染作用。全岩主量元素分析显示它们属于高钾钙碱性系列岩石。单斜辉石、斜方辉石和斜长石斑晶及聚斑晶有相似的稀土元素和微量元素配分模式，但单斜辉石最富集微量元素，其次为斜长石，斜方辉石的含量最低。橄榄石斑晶化学指示岩浆源区可能来源于橄榄岩的部分熔融，而全岩微量元素及单斜辉石斑晶的成分特征记录岛弧环境信息。斑晶矿物平衡温压计算及地球物理学资料共同揭示研究区下方存在两个中酸性岩浆储库：浅部的英安质岩浆储库（深度8.3～13.6 km）和深部的安山质岩浆储库（深度18.4～30.2 km）。本文研究样品均源于深部储库，形成过程包括：基性岩浆补给引发晶粥-熔体的混合作用，当新生熔体在储库中占主导时，触发喷发，并携带半固结岩浆团至地表，形成典型的（聚）斑晶结构。
- 新生代 /
- 高钾钙碱性火山岩 /
- 斑晶 /
- 岩浆储库 /
- 腾冲地区
Abstract: Since the Cenozoic, a large amount of high-potassium calc-alkaline volcanic rocks (basaltic trachyandesite and trachyandesite) have developed in the Tengchong area, but the specific formation process remains unclear. Based on petrographic analysis, this paper conducts whole-rock major element and mineral major and trace element analyses of these volcanic rocks, and discusses their formation and evolution process in combination with the published data. The rocks commonly exhibit porphyritic textures, with phenocrysts predominantly consisting of olivine, pyroxene, and plagioclase, and the development of glomerocrysts. Clinopyroxene phenocrysts commonly show normal zoning, reverse zoning, and oscillatory zoning, with oscillatory zoning indicating multi-stage mafic magma replenishment and possible local contamination during magma evolution. Whole-rock major element analysis reveals that these rocks belong to the high-potassium calc-alkaline rock series. Clinopyroxene, orthopyroxene, and plagioclase phenocrysts and glomerocrysts show similar REE and trace element distribution patterns, with clinopyroxene being the most enriched in trace elements, followed by plagioclase, and orthopyroxene showing the lowest concentrations. The geochemical characteristics of olivine phenocrysts suggest that the magma source region may have originated from partial melting of peridotite, while the trace element compositions of the whole rocks and clinopyroxene phenocrysts record geochemical signatures characteristic of an arc-related tectonic setting. The mineral equilibrium temperature-pressure calculations reveal the existence of two intermediate to felsic magma reservoirs beneath the study area: a shallow dacitic magma reservoir (depth 8.3 ~ 13.6 km) and a deep andesitic magma reservoir (depth 18.4 ~ 30.2 km). The studied samples are derived from the deeper reservoir. Their formation involves mafic magma recharge, triggering mixing between crystal mush and melt; when newly generated melts become dominant within the reservoir, eruption is triggered, carrying semi-consolidated magmatic clots to the surface and forming the typical (glomerocrystic) textures.
- Cenozoic /
- High-K calc-alkaline volcanic rocks /
- Phenocryst /
- Magma reservoir /
- Tengchong area

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参考文献(68)

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腾冲地区新生代高钾钙碱性火山岩结构组成及形成过程

doi: 10.3799/dqkx.2025.173

作者简介:
江涛(1998—），男，硕士研究生，主要从事岩石学、矿物学研究..Email:Jiangt357@outlook.com.ORCID:0009-0003-2073-3594

通讯作者:
郑建平，教授，主要研究深源岩石和岩石圈演化.Email:jpzheng@cug.edu.cn

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The structure composition and formation process of Cenozoic high-K calc-alkaline volcanic rocks in Tengchong area

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留言板

腾冲地区新生代高钾钙碱性火山岩结构组成及形成过程

doi: 10.3799/dqkx.2025.173

作者简介: 江涛(1998—），男，硕士研究生，主要从事岩石学、矿物学研究..Email:Jiangt357@outlook.com.ORCID:0009-0003-2073-3594

通讯作者: 郑建平，教授，主要研究深源岩石和岩石圈演化.Email:jpzheng@cug.edu.cn

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出版历程

The structure composition and formation process of Cenozoic high-K calc-alkaline volcanic rocks in Tengchong area

计量

出版历程

目录

作者简介:
江涛(1998—），男，硕士研究生，主要从事岩石学、矿物学研究..Email:Jiangt357@outlook.com.ORCID:0009-0003-2073-3594

通讯作者:
郑建平，教授，主要研究深源岩石和岩石圈演化.Email:jpzheng@cug.edu.cn