Tertiary basalts of Baffin Bay: Possible primary magma from the Mantle
Tertiary basalts of Baffin Bay: Possible primary magma from the Mantle
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巴芬湾的第三纪玄武岩：可能来自地幔的原生岩浆
DOI：
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发表时间：
1970
期刊：
影响因子：
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通讯作者：
D. B. Clarke
中科院分区：
文献类型：
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作者：
D. B. Clarke
新的分析表明，巴芬湾地区的第三纪拉斑玄武岩具有普遍的原始特征。已知的相关系的材料的玄武岩的散装化学成分的比较表明，这些玄武岩的性质之间的中间调查的天然和合成组合物。这些玄武岩的一个离散组在投影上与石榴石橄榄岩在30 kb处部分熔融所产生的液体的组成相一致。据信，这组岩石的成分主要是通过橄榄石分馏机制成为该省其他岩石的母岩。榴辉岩分馏是用来解释巴芬湾两套玄武岩之间的化学差异。
New analyses show that Tertiary tholeiitic basalts from the Baffin Bay area have generally primitive characteristics. Comparison of the bulk chemical compositions of the basalts with material of known phase relations suggests that these basalts have properties intermediate between investigated natural and synthetic compositions. A discrete group of these basalts coincides in projection with the composition of the liquid produced by the partial melting of garnet periodotite at 30 kb. The compositions in this group are believed to be parental to the other rocks in the province principally through a mechanism of olivine fractionation. Eclogite fractionation is invoked to account for the chemical differences between the two suites of basalts in Baffin Bay.