河北地质大学学报2026，Vol.49Issue(3)：13-23,11.DOI:10.13937/j.cnki.hbdzdxxb.2026.03.002
太行山南段邯邢地区叩天井闪长岩成因:来自锆石U-Pb年龄和角闪石地球化学的约束
Genesis of Koutianjing Monzonorite in the Handan-Xingtai Region of the Southern Taihang Mountains:Constraints from Zircon U-Pb Ages and Amphibole Geochemistry
摘要
Abstract
The mineralised plutons in the Han-xing region generally exhibit high oxygen fugacity characteristics and are closely related to magnetite formation,but the changes in physicochemical conditions during the deep-shallow evolution of magma and their mineralisation control mechanisms are still not well understood.The Koutianjing region is located in the southern part of the Taihang Mountain tectonic-magmatic activity belt,and its diorite provides an ideal subject for exploring these issues.This study conducted zircon U-Pb dating and hornblende composition analysis on diorite from boreholes in the Koutianjing region,systematically reconstructing its crystallisation temperature,pressure,oxygen fugacity,and formation depth.The results show that the diorite formed in the Early Cretaceous,with a weighted average age of 126.8±7.8 Ma,consistent with the main mineralisation period of the Hanxing region.Hornblende records a two-stage crystallisation process:the first stage formed under high-temperature conditions(866～963℃),medium pressure(203～405 MPa),and high oxygen fugacity(ΔNNO=+1.06～+3.09),at a crystallisation depth of 7.16～14.30 km,as magnesian calcic hornblende crystallised from mantle-derived magma;the second stage formed under comparatively lower temperatures(628～667℃),low pressure(26～33 MPa),at a crystallisation depth of 0.93～1.15 km,as shallow hornblende formed during the evolution of crustal-source magma.Combining the chemical characteristics of hornblende in mineralised plutons in the Hanxing region,it is suggested that the Koutianjing diorite records a multi-stage evolution from"deep mantle-derived high oxygen fugacity magma to shallow crustal-derived evolved magma".关键词
成因矿物学/锆石/角闪石/邯邢地区/叩天井Key words
genetic minerology/zircon/amphibole/Handan-xingtai region/Koutianjing分类
天文与地球科学引用本文复制引用
郭子桤,李献龙,梁贤,温雨菁,张龙,朱伊冰,赵志福,吴宇天,张聚全..太行山南段邯邢地区叩天井闪长岩成因:来自锆石U-Pb年龄和角闪石地球化学的约束[J].河北地质大学学报,2026,49(3):13-23,11.基金项目
科学技术类青年拔尖人才项目(BJ2026188) （BJ2026188）
