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Shoshonitic volcanism of the Bodrum caldera (SW Turkey): Hybridization of enriched mantle-derived and crustal melts
Journal of Asian Earth Sciences ( IF 2.7 ) Pub Date : 2021-07-27 , DOI: 10.1016/j.jseaes.2021.104901
H. Evren Çubukçu 1 , Erkan Aydar 1 , İnan Ulusoy 1 , Alain Gourgaud 2
Affiliation  

Bodrum Caldera, located at the southwestern tip of the Anatolian plate, comprises volcanic rocks formed by intrusive, effusive and explosive volcanic activity during Miocene. Volcanic rocks chemically belong to K-rich shoshonitic series and comprised of a range of compositions from absarokites to rhyolites with intrusive micromonzogabbros and micromonzonites. The least evolved magmatic rocks are the post-caldera micromonzogabbros. Blebs/droplets with different mineralogical/petrographical characteristics and resorbed xenocrystic glomerocrysts/cumulates comprised of feldspar and clinopyroxene in disequilibrium with the host rocks suggest that mixing between compositionally different magmas was an important process for the evolution of Bodrum volcanism. Especially shoshonites contain mixing and mingling textures probably occurred between monzogabbroic and more evolved monzonitic magmas. Fractional crystallization was limited to felsic (>60% SiO2) rocks where feldspar, pyroxene, biotite, apatite and zircon were the main fractionating phases. Trace element abundances indicate a garnet-bearing enriched mantle peridotite, resembling EM-1 with a modal assemblage of garnet, rutile, titanite and phlogopite, as the common mantle source rock. Non-modal fractional melting models exhibit that micromonzonites, absarokites and micromonzogabbros were derived from lower (1–3%), moderate (10–15%) and higher (>20%) degrees partial melting of an enriched mantle, respectively. Besides, monzonitic compositions can be produced by partial fusion of a subducting slab with hypothetical composition of 80% GLOSS and 20 % N-MORB. Basic-intermediate compositions can be produced by the mixing/mingling of the micromonzogabbroic and monzonitic magmas. Crustal assimilation and fractional crystallization of hybrid absarokitic melts can yield intermediate-to-felsic compositions of Bodrum shoshonitic series.



中文翻译:

博德鲁姆火山口(土耳其西南部)的 Shoshonitic 火山活动:富含地幔和地壳熔体的杂交

博德鲁姆火山口位于安纳托利亚板块西南端,由中新世侵入性、喷发性和爆发性火山活动形成的火山岩组成。火山岩在化学上属于富含钾的钾长玄武岩系列,由一系列成分组成,从偏斜长岩到带有侵入性微二长岩和微二长岩的流纹岩。演化最少的岩浆岩是火山口后的微二长岩。具有不同矿物学/岩相学特征的气泡/液滴和由长石和斜辉石与主岩不平衡组成的吸收异晶球晶/堆积物表明,成分不同的岩浆之间的混合是博德鲁姆火山作用演化的重要过程。尤其是在二长长岩浆和更演化的二长岩浆之间可能发生的混合和混合纹理。分级结晶仅限于长英质(>60% SiO2) 长石、辉石、黑云母、磷灰石和锆石是主要分馏相的岩石。微量元素丰度表明富含石榴石的地幔橄榄岩,类似于 EM-1,具有石榴石、金红石、钛铁矿和金云母的模态组合,作为常见的地幔烃源岩。非模态分次熔融模型表明,微二长岩、偏长岩和微二长岩分别来自于富集地幔的较低(1-3%)、中等(10-15%)和较高(>20%)度的部分熔融。此外,二长岩成分可以通过假设成分为 80% GLOSS 和 20% N-MORB 的俯冲板片的部分融合产生。碱性-中间体组合物可以通过混合/混合微二长长岩浆和二长岩浆来生产。

更新日期:2021-08-03
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