岩石矿物学杂志2026，Vol.45Issue(2)：280-300,21.DOI:10.20086/j.cnki.yskw.2026.5019
新疆温泉岩群新元古代岩浆岩的锆石U-Pb年龄及地质意义
Zircon U-Pb age and geological significance of Neoproterozoic magmatic rocks in Wenquan Group,Xinjiang
摘要
Abstract
This study presents a systematic petrological,LA-ICP-MS zircon U-Pb geochronological,and whole-rock geochemical investigation on the Neoproterozoic augen-and granitic gneisses from the Wenquan Group,West Tian-shan.Results show that these granitic gneisses crystallized at 904.5±4.1 Ma to 902±4 Ma,representing an early Neoproterozoic magmatic event.The rocks are characterized by high silica(SiO2=65.23％～68.75％),high alkali(ALK=7.46％～8.89％),high potassium(K2O/Na2O=1.01～2.24),and strong peraluminous affinity(A/CNK=1.05～1.18),belonging to the high-K calc-alkaline series and typical S-type granites.They are enriched in Rb,Ba,Th,and light rare earth elements(LREE),depleted in Nb,Sr,Ti,and P,and exhibit moderate negative Eu anomalies.Comprehensive analysis indicates that the magmas were derived from high-temperature dehydration melt-ing of greywacke with minor pelitic rocks from the Paleoproterozoic Wenquan Group,and formed in a syn-collisional tectonic setting related to the Grenvillian orogeny during the assembly of the Rodinia supercontinent.This study provides precise geochronological and geochemical constraints on the Precambrian basement of the Yili Block and offers important insights into the tectonic affinity between the Yili Block,the Central Tianshan Block,and the Tar-im Craton.关键词
新元古代岩浆岩/中亚造山带/锆石U-Pb年龄/岩石地球化学/温泉岩群Key words
Neoproterozoic magmatic rocks/Central Asian Orogenic Belt/zircon U-Pb ages/petrogeochemistry/Wenquan Group分类
天文与地球科学引用本文复制引用
史明明,朱生强,王浪,巴艳君,李元昊..新疆温泉岩群新元古代岩浆岩的锆石U-Pb年龄及地质意义[J].岩石矿物学杂志,2026,45(2):280-300,21.基金项目
中国地质调查局项目(DD20230465,DD20230525,DD20220887) China Geological Survey Project(DD20230465,DD20230525,DD20220887) （DD20230465,DD20230525,DD20220887）
