CAJ | 학술논문

峨眉山大火成岩省于滇西地区广泛发育有一系列的镁铁-超镁铁质岩体，但对于其中地幔包体的报道还相对较少。本次研究在云南中甸地区峨眉山玄武岩中发现了岩性表现为由纯橄岩→辉橄岩→橄辉岩→苦橄岩→辉长岩→辉绿辉长岩→辉绿岩变化系列的超基性-基性岩包体。通过对包体岩石开展元素地球化学分析研究，结果表明：形成包体的原始超基性岩浆属于峨眉山地幔柱活动产物，且与主岩形成背景相似，其岩浆源区位于难熔的方辉橄榄岩区与石榴二辉橄榄岩区的过渡部位，受岩石圈地壳混染程度较低。结合丽江苦橄岩性质，认为滇西地区上地幔存在早阶段峨眉山地幔柱活动。
아미산대화성암성우전서지구엄범발육유일계렬적미철-초미철질암체，단대우기중지만포체적보도환상대교소。본차연구재운남중전지구아미산현무암중발현료암성표현위유순감암→휘감암→감휘암→고감암→휘장암→휘록휘장암→휘록암변화계렬적초기성-기성암포체。통과대포체암석개전원소지구화학분석연구，결과표명：형성포체적원시초기성암장속우아미산지만주활동산물，차여주암형성배경상사，기암장원구위우난용적방휘감람암구여석류이휘감람암구적과도부위，수암석권지각혼염정도교저。결합려강고감암성질，인위전서지구상지만존재조계단아미산지만주활동。
Emeishan large igneous province widely developed inaseriesofmafic-ultramaficpluton inwestern Yunnan.However,reports about mantle xenoliths of Emeishan large igneous province still relatively few. We found a series of ultrabasic-basic xenoliths that have variation of dunite→lherzolite→ olivinepyroxenite→picrites→ gabbro→diabase-gabbro→diabase in Emeishan Basalt from Zhongdian Yunnan.Based on the research of element geochemistry and mineral geochemistry of ultrabasic-basic xenoliths.The results show that ultrabasic magma derived from the mantle plume activity,also have a similar background with the host rock;ultrabasic magma source region has the characteristics of the pomegranate lherzolite zone transition to the harzburgite area,has not been affected by lithospheric mantle and crustal material contamination.And combine the characteristics of the Lijiangpicrites,we draw that the upper mantle of this area exist Emeishan large igneous provinces mantle plume activity,and may represent the early stages of the mantle plume activity.