摘要
幔源岩浆岩是地球各圈层之间无机磷循环研究的重要对象之一。尽管已有多项研究对地球深部的磷含量进行了探讨,但对特定富磷岩浆岩的成因研究仍有待深入。本研究于贵州省西南部识别出一类钙碱性煌斑岩,该煌斑岩w(P_(2)O_(5))介于3.16%~4.74%,平均4.01%,载磷矿物主要为自形-半自形磷灰石,通过与全球不同类型煌斑岩w(P_(2)O_(5))对比,发现如此超常富磷的钙碱性煌斑岩在全球罕见。结合全球富磷超基性岩成因认识与陇要岩体矿物学和地球化学特征,对陇要岩体富磷的可能机制进行了初步探讨,提出富磷煌斑岩的成因除了可能受到地幔源区富磷控制之外,地幔低程度部分熔融、岩浆分离结晶作用、富Ti-P熔体的熔离作用、富磷地质体混染也可能影响煌斑岩磷的超常富集。
Mantle-derived magmatic rocks are important objects for studying the inorganic phosphorus cycling between different spheres of the Earth. Although many studies have investigated the phosphorus contents in the deep Earth, the genesis of individual phosphorus-rich magmatic rocks requires further to be deeply investigated. In this study, a type of calc-alkaline lamprophyre in the southwestern Guizhou has been identified, which w(P_(2)O_(5)) ranging from 3.16% to 4.74%, with an average of 4.01%. The main phosphorus-bearing minerals are euhedral-subhedral apatites. Compared with P_(2)O_(5) contents of different types of lamprophyres globally, it is confirmed that this phosphorus-rich calc-alkaline lamprophyre is a unique one. In conbination with the genetic understandings of global phosphorus-rich ultrabasic rocks and the mineralogical and geochemical characteristics of the Longyao lamprophyre dike, a preliminary discussion on the possible phosphorus-rich mechanism for the Longyao dike has been conducted. It is suggested that the origin of Longyao phosphorus-rich lamprophyre may not only be controlled by the enrichment of phosphorus sourced from the mantle but also be affected by the low degree partial melting of the mantle, magmatic fractional crystallization, melt segregation of Ti-P-rich melt, and the contamination of phosphorus-rich geological bodies.
作者
刘纬鹏
张嘉玮
季国松
叶太平
邱远
朱昱桦
王坤
李永刚
LIU Wei-peng;ZHANG Jia-wei;JI Guo-song;YE Tai-ping;QIU Yuan;ZHU Yu-hua;WANG Kun;LI Yong-gang(College of Resource and Environment Engineering,Guizhou University,Guiyang 550025,China;Guizhou Geological Survey,Bureau of Geology and Mineral Exploration and Development of Guizhou Province,Guiyang 550081,China;102 Geological Team,Bureau of Geology and Mineral Exploration and Development of Guizhou Province,Zunyi 563000,China;Guizhou Central Laboratory of Geology and Mineral Resources,Bureau of Geology and Mineral Exploration and Development of Guizhou Province,Guiyang 550018,China;101 Geological Team,Bureau of Geology and Mineral Exploration and Development of Guizhou Province,Kaili 556000,China)
出处
《矿物学报》
CAS
CSCD
北大核心
2023年第2期263-272,共10页
Acta Mineralogica Sinica
基金
国家自然科学基金项目(编号:41963006)
自然资源部构造成矿成藏重点实验室开放基金(编号:gzck202201)
关键词
不相容元素
右江盆地
超基性岩
无机磷
磷灰石
岩石圈地幔
incompatible elements
Youjiang Basin
ultrabasic rock
inorganic phosphorus
apatite
lithospheric mantle
作者简介
第一作者:刘纬鹏,男,1997年生,硕士研究生,主要从事基性-超基性岩地球化学研究.E-mail:weipengliu2020@126.com;通讯作者:张嘉玮,男,1986年生,正高级工程师,主要从事区域地质调查与研究.E-mail:jiaweizhang@live.cn
