本文選題：OIB　切入點(diǎn)：OPB　出處：《地質(zhì)學(xué)報(bào)》2017年11期 　論文類型：期刊論文

【摘要】：本文集合了GEOROC和PetDB兩個(gè)數(shù)據(jù)庫的資料,對(duì)全球洋島玄武巖(Ocean Island Basalt,OIB)和洋底高原玄武巖(Ocean Plateau Basalt,OPB)數(shù)據(jù)進(jìn)行分析研究。OIB和OPB是板內(nèi)巖漿活動(dòng)的產(chǎn)物,其形成一般與地幔柱(熱點(diǎn))有關(guān)。OPB通常指示地幔柱的頭部,溫度相對(duì)較低;OIB代表地幔柱的尾部,溫度較高。我們對(duì)OIB的數(shù)據(jù)研究表明,OIB中的不相容元素并非像先前認(rèn)為的那么富集,在構(gòu)造判別圖中,OIB和洋中脊玄武巖(Mid Ocean Ridge Basalt,MORB)有很大一部分是重疊的,揭示OIB源區(qū)既有強(qiáng)烈富集不相容元素的,也有明顯虧損的,甚至還有強(qiáng)烈虧損類似島弧玄武巖(Island Arc Basalt,IAB)的。OPB是指發(fā)育在海洋和大陸邊緣的來自地幔的巨量玄武巖,雖然與OIB同屬于板內(nèi)環(huán)境,但OPB的地球化學(xué)性質(zhì)更接近富集型洋中脊玄武巖(Enrich Mid Ocean Ridge Basalt,E-MORB),可能具有OIB和MORB之間過渡的特征。研究表明,OIB和OPB的源區(qū)除了來自下地幔以外(地幔柱),部分可能來自上地幔,有些還可能與板塊消減帶物質(zhì)的再循環(huán)作用有關(guān)。因此,OIB和OPB的成因不可能只用地幔柱一種模式予以解釋,還應(yīng)當(dāng)考慮板塊活動(dòng)中其他因素(洋殼再循環(huán)、古老陸殼再循環(huán)、消減帶物質(zhì)以及水的加入,部分熔融程度、巖漿混合作用、不同地幔端元混合等)的影響。
[Abstract]:In this paper, the data of GEOROC and PetDB are collected, and the data of global oceanic island basaltic basaltic Island (OIBB) and ocean Plateau basalt#en0# (OPBB) are analyzed. OIB and OPB are the products of intraplate magmatic activity. OPB usually indicates the head of the mantle plume, and the relatively low temperature of OIB represents the tail of the mantle plume. Our data on OIB show that the incompatible elements are not as enriched as previously thought, and there is a great deal of overlap between OIB and Mid Ocean Ridge basaltMORBs in the tectonic discriminant diagram. It is revealed that the OIB source region has both strong enrichment of incompatible elements and significant depletion, and even a strong depletion similar to that of Island Arc basaltIab), which refers to a large amount of mantle basalts developed in the ocean and continental margins. Although it belongs to the same board environment as OIB, However, the geochemical properties of OPB are more similar to those of the enriched Mid Ocean Ridge basaltl E-MORBN, which may be characterized by the transition between OIB and MORB. The results show that the source regions of OPB and OPB are derived from the lower mantle (mantle plume, some of them may come from the upper mantle). Some may also be related to the recycling of subduction zone material. Therefore, the origin of OIB and OPB cannot be explained by a single mantle plume model, and other factors in plate activity (ocean crust recycling, ancient continental crust recycling) should also be taken into account. The influence of subtractive zone material and water, partial melting degree, magmatic mixing, and different mantle end element mixing, etc.
【作者單位】： 蘭州大學(xué)地質(zhì)科學(xué)與礦產(chǎn)資源學(xué)院甘肅省西部礦產(chǎn)資源重點(diǎn)實(shí)驗(yàn)室(蘭州大學(xué));中國科學(xué)院地質(zhì)與地球物理研究所;中國科學(xué)院地質(zhì)與地球物理研究所巖石圈演化國家重點(diǎn)實(shí)驗(yàn)室;北京礦產(chǎn)地質(zhì)研究所;
【基金】：中央高�；究蒲袠I(yè)務(wù)費(fèi)項(xiàng)目(編號(hào)Lzu-Jbky-2012-128)資助成果
【分類號(hào)】：P736

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