| 黑龙江省二克山—五大连池—科洛富钾火山岩中幔源包体的研究 |
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| 引用本文： | 邱家骧,吴志勤,杜向荣.黑龙江省二克山—五大连池—科洛富钾火山岩中幔源包体的研究[J].现代地质,1987(Z1). |
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| 作者姓名： | 邱家骧 吴志勤 杜向荣 |
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| 作者单位： | 中国地质大学
(邱家骧)，南京地质矿产研究所
(吴志勤)，黑龙江省地质科学研究所(杜向荣) |
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| 摘 要： | 本文首次系统地研究了二克山—五大连池—科洛富钾火山岩带中幔源超镁铁岩包体的岩相、组构、矿物及地化特征,并分析了包体的成因类型及交代作用。研究表明,该包体是受富含K_2O+LIL+LREE±FeO±~(87)Sr流体交代的、已亏损了的地幔样品,反映了地幔交代的普遍性和不均一性。
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INVESTIGATION ON MANTLE-DERIYED INCLUSIONS FROM K-RICH YOLCANICS IN ERKESHAN-WUDALIANCHI KELUO,HEILONGJIANG PROVINCE |
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| Abstract: | Tbis paper presents the analysis results of 83 electronprobe, 8 bulk chemical,5 transition metal elements,3 incompatible elements, 9 REE and 2 Sr isotopes. Based on them, it is infered that these ultramafic rock inclusions are type I inclusions,
Type I inclusions are rich in K2O,LIL and LREE, and are depleted in some easily melting components(SiO2,TiO2 ,Al2O3,CaO and Na2O) .Strikingly,some type I inclusions have Fe-rich minerals, especially olivines.The presence of 2 Sr isotopes shows that the upper mantle in this area is heterogeneous in Sr isotopes. The authors concluded that the upper mantle in this area must undergo two geologic events, 1st, the upper mantle was made to be depleted in basaltic compositions by partial melting; 2nd, the depleted mantle was metasomatized by fluid from the deeper part of the mantle.
All in all, it is believed that the type I inclusions may represent the depleted mantle samples, which are metasomatized by fluid rich in K2O+ |
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