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当代大气候学家寇本氏已于1940年六月二十二日逝世于 Graz,享寿九十有四。氏于1846年九月二十五日生于俄之彼得格勒,度其幼年生涯于黑海滨之 Crimea,父为著名之历史家,素为俄皇所赏识,黑海滨之产业即为俄皇所赠者。氏生时常称道此处气候温和风景优美以及温带植物之丰富;氏称气候与植物界关系所得之印像,于彼一生之科学生涯极为重要。自1875至1919年之44年皆服务于德汉堡海洋观象 相似文献
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The Junggar Immature Continental Crust Province and Its Mineralization 总被引:22,自引:4,他引:18
WANG Jingbin WANG Yuwang WANG Lijuan Beijing Institute of Geology for Mineral Resources Beijing 《《地质学报》英文版》2004,78(2):337-344
According to the study on the peripheral orogenic belts of the Junggar basin and combined with the interpretation of geophysical data, this paper points out that there is an Early Paleozoic basement of immature continental crust in the Junggar area, which is mainly composed of Neoproterozoic-Ordovician oceanic crust and weakly metamorphosed covering sedimentary rocks. The Late Paleozoic tectonism and mineralization were developed on the basement of the Early Paleozoic immature continental crust. The Junggar metallogenic province is dominated by Cr, Cu, Ni and Au mineralization. Those large and medium-scale deposits are mainly distributed along the deep faults and particularly near the ophiolitic melange zones, and formed in the Late Paleozoic with the peak of mineralization occurring in the Carboniferous-Permian post-collisional stage. The intrusions related to Cu, Ni and Au mineralization generally have low Is, and positive εNd(t) values. The δ34S values of the ore deposits are mostly near zero, and t 相似文献
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蒋仲 《资源导刊(河南)》2007,(3)
江河如生物一样都是有年龄的.它们的成长也如同一个人的一生,分为婴年、幼年、青年、壮年和老年等几个阶段.不过河流的成长速度大慢,即使你活到100多岁,也许还看不出它有多大的变化.那我们又怎样知道河流的年龄呢? 原来,河流在发育过程中,即使是它千百万年前走过的路,也会在地面上留下足迹.我们寻踪觅迹,就能从它们的足迹上确定它们的年龄,就像我们从牛、马的牙齿,树木的年轮来考察它们的年龄一样. 相似文献
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