| Geochemical Features of Ophiolite in Mianxian Lueyang Suture Zone，Qinling Orogenic Belt |
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| 作者姓名： | Lai Shaocong Zhang Guowei |
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| 作者单位： | Department of Geology，Northwest University，Xi'an 710069 |
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| 摘 要： | ＧｅｏｃｈｅｍｉｃａｌＦｅａｔｕｒｅｓｏｆＯｐｈｉｏｌｉｔｅｉｎＭｉａｎｘｉａｎＬｕｅｙａｎｇＳｕｔｕｒｅＺｏｎｅ，ＱｉｎｌｉｎｇＯｒｏｇｅｎｉｃＢｅｌｔＬａｉＳｈａｏｃｏｎｇ；ＺｈａｎｇＧｕｏｗｅｉ（ＤｅｐａｒｔｍｅｎｔｏｆＧｅｏｌｏｇｙ，Ｎｏｒｔ...
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Geochemical Features of Ophiolite in Mianxian Lueyang Suture Zone, Qinling Orogenic Belt |
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| Lai Shaocong, Zhang Guowei.Geochemical Features of Ophiolite in Mianxian Lueyang Suture Zone, Qinling Orogenic Belt[J].Journal of China University of Geosciences,1996(2). |
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| Authors: | Lai Shaocong Zhang Guowei |
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| Abstract: | The ultrahasic rocks in the Mianxian-Lueyang ophiolite belt are mainly harzburgite and dunite, and exhibit two types of REE distribution pattern: (1) LREE depletion, with remarkable Eu enrichment; (2) slight enrichment of LREE, with Eu deficiency. Both gabbros (accumulative gabbros) and diabasic dike swarms show a LREE enrichment but a slight Eu anomaly. The ratios of w (Ti) /w (V), w (Th) /w (Ta). w (Th) /w (Yb) and w (Ta) /w (Yb) indicate that the mid-ocean ridge basalts in this region originated from depleted mantle of asthenosphere, implying an association of MORB-type ophiolite and an ancient ocean basin between Qinling and Yangtze plates during Middle Paleozoic-Early Mesozoic era. The island arc volcanic rocks can be divided into tholeiitic and cafe-alkaline associations, which originated from the upper mantle wedge above slab by partial melting. |
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| Keywords: | geochemistry ophiolite Qinling |
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