南极长城站附近的脊椎动物 Ⅰ鸟类 |
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引用本文: | 张春光,高耀亭.南极长城站附近的脊椎动物 Ⅰ鸟类[J].极地研究,1991,2(1):30-38. |
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作者姓名: | 张春光 高耀亭 |
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摘 要: | 本文对在南极长城站区附近活动的6科11种鸟类的数量、分布、繁殖、行为、栖息环境等作了比较详细的报道。作者认为:(1)在长城站区附近分布的鸟类全为肉食性种类;(2)企鹅在整个食物链中占有非常重要的作用;(3)亲鸟的护幼行为较强;(4)所观察到的鸟类全为早成或半早成鸟,但亲鸟育雏期又都较长,这是一种特殊习性。
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关 键 词: | 南极长城站 鸟类 种类 生态习性 |
SYSTEMATIC COVARIATION OF SR, BA, CA ELEMENTS IN CENOZOIC VOLCANIC ROCKS ON THE FILDES PENINSULA, WEST ANTARCTICA, AND ITS RELATION TO PETROGENESIS |
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Abstract: | Cenozoic volcanic rocks in the Fildes Peninsula are composed of High-Al basalt, basaltfc andesite, andesite, and dacite belonging to a calc-alkaline volcanic series with low-K and high-Al characteristics. Using a new indicator, the Sr / Ca-Ba / Ca, systematics proposed by Onuma (1980, 1981) and Sr, Ba, Ca concentrations in volcanic lavas and subvolcanic rocks, the authors find that the high-Al basaltic volcanic rocks either in volcanic strata or in subvolcanic intrusives were formed from a primary magma, in different stages through the fractional crystallization of clinopyro-xene(Cpx)and plagioclase (P1) in the process of magmatic evolution, resulting in the formation of basaltic-andesitic, andesitic and dacitic rocks. |
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