| 扬子岩浆岩带东段基性岩地球化学 |
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| 引用本文： | 邢凤鸣.扬子岩浆岩带东段基性岩地球化学[J].地球化学,1998,27(3):258-268. |
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| 作者姓名： | 邢凤鸣 |
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| 作者单位： | 安徽省地质科学研究所!合肥，230001 |
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| 摘 要： | 长江中下游中生代岩浆岩带称为扬子岩浆岩带。该带岩浆岩属高钾钙碱性岩系和橄榄安粗岩系，共基性端员玄武岩和辉长岩高钾富碱，硅弱不饱和，富集Ｒｂ、Ｂａ、Ｔｈ、Ｋ、ＬＲＥＥ等强不相容元素，强烈亏损Ｃｒ、Ｎｉ等强相容元素；ＲＥＥ球粒陨石标准化曲线为右倾型，在Ｌａ／Ｓｍ－Ｌａ图上排列成一斜线，是地幔不同程度部分熔融为主的产物。基性岩εＮｄ较高，Ｉｓｒ较低，在εＮｄ－ＩＳｒ图上沿地幔排列及其延长线分布，略向右漂
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| 关 键 词： | 基性岩 地球化学 长江中下游 岩浆岩 |
GEOCHEMISTRY OF BASIC ROCKS FROM THE EASTERN PART OF THE YANGTZE MAGMATIC ROCK BELT |
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| Xing Fengming.GEOCHEMISTRY OF BASIC ROCKS FROM THE EASTERN PART OF THE YANGTZE MAGMATIC ROCK BELT[J].Geochimica,1998,27(3):258-268. |
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| Authors: | Xing Fengming |
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| Abstract: | The Mesozoic magmatic rock belt along the Middle and Lower Reaches of the 0Yangtze River, i.e.the Yangtze magmatic rock belt belongs to high-K calc-alkaline rock series and shoshonitic rock series. Their basic end-members are basalt and gabbro characterized by high alkaline(especially K) contents and weakly Si-unsaturation as well as enrichment of incompatible elements(such as Rb, Ba Th, K and LREE)and strong depletion of compatible elements (such as Cr, Ni,).The chondrite-normalized REE distribution patterns of these rocks show significant LREE enrichment. On the La/ Sm-La diagram, all basic samples plot on an oblique line, indicating that they were the products of partial melting of a mantle source in varying degrees. The basic rocks have higher Nd values and lower Isr ratios which plot roughly along the mantle array and its extension to the crustal side. Such Sr and Nd isotopic characters are interpreted by an AFC process, i.e. the parent mantle-derived alkaline-rich basaltic magma was assimilated by ancient lower crustal component during the fractional crystallization. Ph isotopic data support this interpretation for the genesis of these basic rocks. |
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| Keywords: | basic rock geochemistry the Middle and Lower Reaches of the Yangtze River |
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