高校地质学报2024，Vol.30Issue(6)：635-645,11.DOI:10.16108/j.issn1006-7493.2023067
球状花岗质岩石的成因
The Origin of Orbicular Granitoids
摘要
Abstract
Granitoids with orbicular structure are very rare because of their unique orbicular structure.They stand as unique objects to study magma processes.When high-temperature magma contacted or mixed with low-temperature magma,due to their difference in viscosity and temperature,high interfacial tension leads the high-temperature magma to form orbicules in low-temperature magma.The temperature of orbicules decrease rapidly and result in high degrees of supercooling.Induced by exsolution of volatiles or other factors,the orbicules begin to crystallize and branched or feathery crystals are formed.The rapid crystallization in orbicules results in rapid change of local melt and the alternating crystallization of different minerals,forming dark and light rings.During this process,the crystallized minerals can exhibit branched or feathery structures.However,it is still unclear how viscosity and temperature control spheroidization,and how minerals crystallize after spheroidization,and how long the crystallization process lasts.These issues are waiting to be studied and revealed.关键词
球状花岗质岩石/岩浆混合/过冷/振荡结晶Key words
orbicular granitoids/magma mixing/overcooling/oscillatory crystallization分类
天文与地球科学引用本文复制引用
曹雨霏,李舒婷,张少兵,黄方..球状花岗质岩石的成因[J].高校地质学报,2024,30(6):635-645,11.基金项目
国家自然基金(41973002)资助 （41973002）
