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辽西中生代晚期岩石圈地幔的性质:来自玄武岩和地幔捕虏体的证据
引用本文:王冬艳,许文良,冯宏,林景仟,郑常青.辽西中生代晚期岩石圈地幔的性质:来自玄武岩和地幔捕虏体的证据[J].吉林大学学报(地球科学版),2002,32(4):319-324.
作者姓名:王冬艳  许文良  冯宏  林景仟  郑常青
作者单位:1. 吉林大学地球科学学院,吉林,长春,130026
2. 东北水利水电勘测设计院,吉林,长春,130062
基金项目:高等学校博士学科点专项科研项目;20010183007;
摘    要:辽西中生代玄武岩中幔源气榄岩捕虏体的岩石学、矿物学和地球化学研究表明,中生代岩石圈地幔是由古老富集型的岩石圈地幔和新增生的岩石圈地幔所组成。前者以角闪尖晶二辉橄榄岩为代表,它经历了富钠质的地幔交代作用。橄榄岩类捕虏体富含轻稀土元素,并具有较高的ω(^87Sr)/ω(^86Sr)比值;后者以二辉石岩为代表,具典型堆积结构,与本区尖晶石二辉橄榄岩相比,具有较高的稀土元素丰度。在矿物成分和稀土元素丰度上,本区辉石岩捕虏体类似于中国东部新生代玄武岩中幔源辉石岩捕虏体,这意味着辉石岩捕虏体可能是上地幔中更早期的岩浆堆积体。

关 键 词:中生代  岩石圈  地幔  玄武岩  地幔捕虏体  辽宁
文章编号:1671-5888(2002)04-0319-06
修稿时间:2002年3月25日

NATURE OF LATE MESOZOIC LITHOSPHERIC MANTLE IN WESTERN LIAONING PROVINCE:EVIDENCES FROM BASALT AND THE MANTLE-DERIVED XENOLITHS
WANG Dong yan ,XU Wen liang ,FENG Hong ,LIN Jing qian ,ZHENG Chang qing.NATURE OF LATE MESOZOIC LITHOSPHERIC MANTLE IN WESTERN LIAONING PROVINCE:EVIDENCES FROM BASALT AND THE MANTLE-DERIVED XENOLITHS[J].Journal of Jilin Unviersity:Earth Science Edition,2002,32(4):319-324.
Authors:WANG Dong yan  XU Wen liang  FENG Hong  LIN Jing qian  ZHENG Chang qing
Institution:WANG Dong yan 1,XU Wen liang 1,FENG Hong 2,LIN Jing qian 1,ZHENG Chang qing 1
Abstract:The petrological, mineralogical and geochemical data of the mantle-derived xenoliths in Mesozoic basalts from western Liaoning province indicate that late Mesozoic lithospheric mantle is composed of older enriched and new accreted lithospheric mantle. The former is representive of amphibole-spinel-lherzolite, which is involved in Na rich mantle metasomatism. The peridotite xenoliths are rich in LREE and have higher w ( 87 Sr)/ w ( 86 Sr) ratios; The latter is representive of pyroxenite, which displays the accumulate texture and has higher REE abundance than the Sp-lherzolite from the region. The pyroxenite is similar tothe mantle-derived pyroxenitexenoliths in Cenozoic basalts from eastern China in mineral composition and REE abundance, which implies that they could be an earlier magmaticaccumulate in the upper mantle.
Keywords:western Liaoning  Mesozoic era  lithospheric mantle  basalt  mantle  derived xenolith
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