Recurrent Cenozoic volcanic activity in the Bohemian Massif (Czech Republic)
Recurrent Cenozoic volcanic activity in the Bohemian Massif (Czech Republic)
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波西米亚地块新生代火山活动频繁发生（捷克共和国）
DOI：
10.1016/j.lithos.2010.12.008
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发表时间：
2011
期刊：
影响因子：
3.5
通讯作者：
K. Balogh
中科院分区：
文献类型：
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作者：
J. Ulrych;J. Dostal;J. Adamovič;E. Jelínek;P. Spacek;E. Hegner;K. Balogh
波希米亚地块新生代非造山火山作用是中欧火山省的组成部分。利用波希米亚地块火山岩的时空分布、地球化学和矿物学以及构造背景和古应力资料对该火山活动进行了刻画和分类。根据K-Ar资料和已知的古应力场，可以划分出三个主要的火山期：(1)前裂谷(79-49 Ma)，(2)同裂谷(42-16 Ma)和(3)晚期裂谷(16-0.3 Ma)，最年轻的时期进一步细分为三幕。各期镁铁质岩石类型以霞石-玄武岩/软玉为主。波希米亚北部裂谷前时期的黄长岩超镁铁质岩套和波希米亚西部裂谷晚期末期的黄长岩超镁铁岩是例外。最大的火山岩是同裂谷时期的火山岩，产于哦ře裂谷地块。波希米亚地块基性火山岩的初始87Sr/86Sr(0.7032~0.7050)和143Nd/144Nd(0.51264~0.51301)比值是岩石圈下地幔源区岩浆的特征。同位素组成与HIMU地幔源区(206Pb204Pb19~20)相似。这些岩石的同位素组成是中欧火山省火山岩中最贫乏的。
Cenozoic anorogenic volcanism of the Bohemian Massif is an integral part of the Central European Volcanic Province. The temporal and spatial distribution of volcanic rocks in the Bohemian Massif, their geochemistry and mineralogy as well as their tectonic setting and paleostress data are used to characterize and classify this volcanic activity. Three main volcanic periods can be distinguished based on K–Ar data and known paleostress fields: (i) pre-rift (79–49Ma), (ii) syn-rift (42–16Ma) and (iii) late-rift (16–0.3Ma), with the youngest period further subdivided into three episodes. The dominant mafic rock types (>7wt.% MgO) of all periods are of nephelinite–basanite/tephrite composition. The exceptions are suites of melilitic ultramafic rocks of the pre-rift period in northern Bohemia and of the final episode of the late-rift period in western Bohemia. The most voluminous are volcanic rocks of the syn-rift period occurring in the Ohře Rift Graben. The initial87Sr/86Sr (0.7032 to 0.7050) and143Nd/144Nd (0.51264 to 0.51301) ratios of the mafic volcanic rocks of the Bohemian Massif are characteristic of magmas derived from a sub-lithospheric mantle source. The isotopic ratios resemble those of the HIMU mantle source (206Pb/204Pb ca. 19 to 20). These rocks have the most isotopically depleted compositions among the Central European Volcanic Province volcanics.
西波希米亚 OhÅe（埃格尔）裂谷隆起肩部高、低钛玄武岩的地球化学特征
影响因子：
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作者：
Ulrych;Jelínek;Řanda;Balogh;Hegner;Novák
通讯作者：
Novák