黔东北松桃高地南华系铁丝坳组和两界河组碎屑组分及源区背景  

Detrital composition of Tiesiao Formation and Liangjiehe Formation of Nanhua System in Songtao Highland of the northeastern Guizhou Province and tectonic setting of its source regions

作　　者：龙建喜 周琦 张遂[2] 朱路艳 杨忠琴 LONG Jianxi;ZHOU Qi;ZHANG Sui;ZHU Luyan;YANG Zhongqin(Guizhou Geology Institution,Guizhou Guiyang 550081,China;No.103 Geology Team,Guizhou Geology and Mineral Development Bureau,Guizhou Tongren 554300,China;Guizhou Geology and Mineral Center,Guizhou Guiyang 550018,China)

机构地区：[1]贵州省地质调查院,贵州贵阳550081 [2]贵州省地质矿产勘查开发局一〇三地质大队,贵州铜仁554300 [3]贵州省地质矿产中心实验室,贵州贵阳550018

出　　处：《中国地质调查》2024年第4期42-49,共8页Geological Survey of China

基　　金：中央引导地方科技发展资金项目“锰矿资源深部预测勘查技术研发基地(编号:黔科中引地[2021]4027)”;贵州省找矿突破战略行动重大协同创新项目“贵州锰、磷、铝优势资源成矿规律与快速高效智慧化勘查技术研究与示范(编号:黔科合战略找矿[2022]ZD003)”联合资助。

摘　　要：雪峰运动的构造属性一直存在较大争议。统计黔东北松桃高地南华系铁丝坳组和两界河组的陆源碎屑组分,并应用Dickinson三角图解原理进行分析。研究结果显示:铁丝坳组和两界河组沉积时期陆源碎屑的物源主要来自火山弧源区和再旋回造山带,伴随有火山活动;铁丝坳组的碎屑成分成熟度较低,主要投点在火山弧物源区,显示了近源剥蚀、搬运堆积的特征,两界河组的石英矿物屑含量比铁丝坳组高,趋向于再旋回造山带物源;碎屑组分中岩屑的岩性组合为玄武岩、安山质玄武岩、粗面岩、凝灰岩、熔结凝灰岩、流纹岩、长英质糜棱岩等,表明在铁丝坳组和两界河组沉积时期或沉积之前,研究区就已进入陆内裂陷和板内造山的大地构造背景。研究可为该地区雪峰运动的构造属性提供微观证据。The tectonic properties of Xuefeng movement has significant controversies.This study anglyzed the terrigenous detrital composition of Tiesiao Formation and Liangjiehe Formation of Nanhua System in Songtao Highland of the northeastern Guizhou Province,using Dickinson triangle diagrams theory.The results show that the terrigenous detrital source mainly comes from arc orogen sources and recycled orogen provenances,accompanied by volcanic activities.The maturity of the detrital components in Tiesiao Formation is relatively low,and the components mainly landed around the volcanic arc source area,showing the characteristics of near erosion and transporting accumulation.The quartz content in Liangjiehe Formation is higher than that in Tiesiao Formation,which lands in the recycled orogen provenances.The detrital composition contains basalt,andesitic basalt,trachyte,tuff,ignimbrite,rhyolite,felsic mylonites and so on,indicating that intracontinental rift and intraplate orogenic mechanism occurred during or before the sedimentation of Tiesiao Formation and Liangjiehe Formation in the study area.This research could provide some microscopic evidence for tectonic attribute of Xuefeng movement.

关 键 词：南华系 铁丝坳组 两界河组 陆源碎屑 陆内裂陷 板内造山 

分 类 号：P581[天文地球—岩石学] TV211.1[天文地球—地质学]