岩石矿物学杂志2025，Vol.44Issue(6)：1409-1422,14.DOI:10.20086/j.cnki.yskw.2025.4208
敦煌地块南缘好布拉岩体年代学、地球化学特征及地质意义
Chronology,geochemical characteristics,and geological significance of the Haobula pluton on the southern margin of the Dunhuang massif
摘要
Abstract
To explore the Paleozoic tectonic evolution characteristics of the southern margin of the Dunhuang block and constrain the activity trajectory of the southern side of the Central Asian orogenic belt,zircon U-Pb dating and petrological-geochemical analysis were conducted on the Haobula pluton.The LA-ICP-MS zircon U-Pb dating results indicate that the crystallization age of the Haobula pluton is 324.0±1.1 Ma,belonging to the Early Carbonif-erous period.Geochemical analysis of the rock reveals that the SiO2 content of the Haobula pluton ranges from 65.31％to 75.50％,with an average total alkali(K2O+Na2O)content of 7.77％.The K2O/Na2O ratio varies from 0.90％to 1.35％.The Al2O3 content ranges from 13.41％to 16.05％.It belongs to the high-potassium calc-alkaline,per-aluminous series.The pluton is relatively enriched in LREE and depleted in HREE(LREE/HREE=11.96～26.01),with a slight negative Eu anomaly(δEμ=0.70～1.01).It is relatively enriched in large-ion lithophile ele-ments such as Rb,Ba,and K,as well as strong incompatible elements like Th,and depleted in high-field-strength elements like Nb,Ti,and P.Considering the regional tectonic features,it is believed that the southern margin of the Dunhuang massif was in the late stage of continental-continental collision(crustal thickening)during the Early Carboniferous.关键词
好布拉岩体/地壳增厚/敦煌地块/锆石U-Pb年龄Key words
Haobula pluton/crustal thickening/Dunhuang massif/zircon U-Pb age分类
天文与地球科学引用本文复制引用
雷自强,赵吉昌,陈杰,周定飞,杨镇熙,李省晔,方成豪,黄斌,刘灵玉..敦煌地块南缘好布拉岩体年代学、地球化学特征及地质意义[J].岩石矿物学杂志,2025,44(6):1409-1422,14.基金项目
甘肃省省级基础地质调查项目(甘财资环[2022]43号、甘资字[2024]24号、甘资字[2024]134号) （甘财资环[2022]43号、甘资字[2024]24号、甘资字[2024]134号）
中央引导地方科技发展资金项目(24ZYQF001) （24ZYQF001）
甘肃省科技计划项目(24JRRF004) （24JRRF004）
河北省高等学校科学研究项目(QN2025335) Gansu Provincial Basic Geological Survey Project(Gan Cai Zi Huan[2022]No.43,Gan Zi Zi[2024]No.24,Gan Zi Zi[2024]No.134) （QN2025335）
Central Leading Local Science and Technology Development Fund Project(24ZYQF001) （24ZYQF001）
Gansu Province Science and Technology Plan Project(24JRRF004) （24JRRF004）
Hebei Province Higher Education Science Research Project(QN2025335) （QN2025335）
