摘要
通过研究表明 ,克里阳钾镁煌斑岩的δ13 C值为 - 2 .7‰～ - 3.3‰ ,δ18O值为 +14 .5 7‰～ +16 .4 3‰。其相容元素Cr、Ni,不相容元素Ba、Sr、Nb、Ta、Zr、Hf、Th含量比较亏损 ,惰性元素及放射性生热元素等 (除U外 )均较亏损 ,极亏损高场强元素Nb、Ti、Ta ,说明其产出可能与古俯冲作用有关。这些特征均表明 ,该区钾镁煌斑岩比较完好地保存着源区特征。克里阳钾镁煌斑岩的Sr初始比值为 0 .70 80 7,与国际同类岩石相比有些偏高 ,在中国属中度 ;Pb同位素比值2 0 6Pb/2 0 4Pb为 18.35 5 6。从Pb、Sr同位素组成及其他地球化学特征来看 。
In this paper, the authors have mainly studied stable and radioactive isotope characteristics of lampoite from Keliyang, Xinjiang.δ 13C andδ 18O are -2.7～-3.3‰ and +14.57～+16.43‰ respectively. The content of compatible elements Cr and Ni and that of incompatible elements Ba, Sr, Nb, Ta, Zr, Hf and Th are relatively depleted, the inert elements and radioactive heat-generating elements are all relatively depleted except for U, and the high field-density elements Nb, Ti and Ta are strongly depleted, suggesting that the origin of the lamproite is related to the subduction. All of these characteristics indicate that the lamproite has preserved the features of its source area. A comparison is made between this lamproite and lamproite in other areas of the world. The initial Sr ratio is 0.70807,which is somewhat high compared with the similar rocks in the world. The 206Pb/ 204Pb ratio is 18.3556, which is rather high. From the Pb and Sr isotopic composition and other geochemical characteristics of the lamproite, it is concluded that it was produced through the mixture of the depleted mantle with the recycling crustal materials.
出处
《地球学报》
EI
CAS
CSCD
北大核心
2003年第6期599-602,共4页
Acta Geoscientica Sinica
基金
国家自然科学基金项目 ( 4 9973 0 13 )
国家地质调查局 (科 [2 0 0 3 ] 0 0 3 0 1)资助
