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首页> 外文期刊>Contributions to Mineralogy and Petrology >Cumulate xenoliths from St. Vincent, Lesser Antilles Island Arc: a window into upper crustal differentiation of mantle-derived basalts
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Cumulate xenoliths from St. Vincent, Lesser Antilles Island Arc: a window into upper crustal differentiation of mantle-derived basalts

机译：聚集小安的列斯群岛弧圣文森特的异岩：一个探查地幔衍生玄武岩上地壳的窗口

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摘要

In order to shed light on upper crustal differentiation of mande-derived basaltic magmas in a subduction zone setting, we have determined the mineral chemistry and oxygen and hydrogen isotope composition of individual cumulus minerals in plutonic blocks from St. Vincent, Lesser Antilles. Plutonic rock types display great variation in mineralogy, from olivine-gabbros to troctolites and hornblen-dites, with a corresponding variety of cumulate textures. Mineral compositions differ from those in erupted basaltic lavas from St. Vincent and in published high-pressure (4-10 kb) experimental run products of a St. Vincent high-Mg basalt in having higher An plagioclase coexisting with lower Fo olivine. The oxygen isotope compositions (?~(18)O) of cumulus olivine (4.89-5.18%o), plagioclase (5.84-6.28%o), clinopyroxene (5.17-5.47%o) and hornblende (5.48-5.61%o) and hydrogen isotope composition of hornblende (3D = -35.5 to - 49.9%o) are all consistent with closed system magmatic differentiation of a mantle-derived basaltic melt.
机译：为了阐明俯冲带背景下源自曼德州的玄武岩浆的上地壳分异，我们确定了小安地列斯州圣文森特的深成岩块中单个积云矿物的矿物化学以及氧和氢同位素组成。从橄榄石辉长岩到闪粉岩和角闪石岩，深成岩类型在矿物学上表现出很大的差异，并具有相应的堆积纹理。矿物组成与圣文森特喷出的玄武岩熔岩和圣文森特高镁玄武岩的高压（4-10 kb）实验运行产品中的矿物组成不同，后者具有较高的斜长石与较低的橄榄石岩共存。橄榄石（4.89-5.18％o），斜长石（5.84-6.28％o），斜cl（5.17-5.47％o）和角闪石（5.48-5.61％o）的氧同位素组成（？〜（18）O）和角闪石的氢同位素组成（3D = -35.5至-49.9％o）均与源自地幔的玄武质熔体的封闭系统岩浆分异一致。

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