Mesozoic O-type adakitic volcanic rocks and its petrogenesis, paleo-tectonic dynamic and mineralization significance of the eastern side of sourthern Da Hinggan, China
文献类型：期刊论文
| 作者 | Zhang YongBei; Sun ShiHua; Mao Qian |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2006-09-01 |
| 卷号 | 22期号:9页码:2289-2304 |
| 关键词 | O-type Adakite Paleozoic Volcanic Rock Southern Da Hinggan Petrogenesis Tectonic Dynamic Mineralization |
| ISSN号 | 1000-0569 |
| 文献子类 | Article |
| 英文摘要 | The valley of Chagan Mulun River on the north side of Xila Mulun river in eastern Mongolian, is the east side of southern Da Hinggan Mesozoic volcano-platonic complex zone. Recently, many adakitic volcanic rocks with a little intergrowth of sodium rhyolite and basalt have been discovered in the Neo-mesozoic Manketou Obo volcanic group in this area. Of the adakite, Al2O3 > 15%, MgO < 3. 4%, average K2O = 1.77 %, Na2O/K2O > 1, LREE enriched, but HREE and LITE greatly depleted, lack negative Eu anomaly, high Sr (497. 91 x 10(-6) similar to 896.40 x 10(-6)), low Y (4.33 x 10(-6) similar to 15.77 x 10(-6) < 18 x 10(-6)), low Yb (0.35 x 10(-6) similar to 1.54 x 10(-6) < 1.9 x 10(-6)), I-sr = 0. 70374 similar to 0. 70594, epsilon(Nd) (t) = -0.45 similar to + 6. 58. In K-Na-Ca, Rb-Sr-Ba, Sr/Y-Y and Sr/Yb-Yb diagram, all data of the rocks are distributed in adakitic region and show the evolution trend of trondhjemite. Therefore, those rocks are typical O-type adakites. Of those rocks with their intergrowths epsilon(Nd) (t), I-sr are close to that of Neo-paleozoic basalt, t(DM)(677 similar to 845Ma) of a part of adakite are the same of that (t(DM) = 627 similar to 998 Ma) of Neo-paleozoic subducted oceanic slab. Their Sr-Nd isotopic and Zr/Hf-Nb/Ta ratios reveal the mixed feature of depleted mantle and lower crust, otherwise, a few adakite (t(Dm) = 343 453Ma) are derived from younger mantle of Paleozoic. Hereby, infer that the source rocks are the lower crust of accretionary terrane consisted of multi-source materials dominated by Neo-Proterozoic subducted oceanic slab. Lar,/YbN-YbN and La/Sm-La diagram reveal that the adakitic magma was primitive magma created by source rocks partial melting via eclogite phase metamorphism, sodium rhyolite magmas were results of those primitive magma differentiation crystallization, but basalt should be created by deeply partial melting of the source rock. The petrochemical and trace elemental indicators show that those volcanoes were active in a continental marginal arc. This kind of arc and adakitic volcanic rocks appeared in Da Hinggan area in Mesozoic should be the result of that the remnant Paleoasia oceanic slab subducted down again along the surviving subduction zone to the lower crust of accretionary terrane and partially melted in Mesozoic. The mineralization of iron, copper and gold closely grown in this rock group is most likely to indicate a great prospect area. |
| WOS关键词 | GEOCHEMICAL CHARACTERISTICS ; DACITE GENESIS ; NORTH CHINA ; GEODYNAMIC SIGNIFICANCES ; SUBDUCTED LITHOSPHERE ; CONTINENTAL-CRUST ; YANSHAN PERIOD ; SR GRANITOIDS ; IGNEOUS ROCKS ; CALC-ALKALINE |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000242107400004 |
| 出版者 | SCIENCE CHINA PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/66034]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Zhang YongBei |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Hainan Normal Univ, Dept Resources Environm & Tourism, Haikou 57000, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang YongBei,Sun ShiHua,Mao Qian. Mesozoic O-type adakitic volcanic rocks and its petrogenesis, paleo-tectonic dynamic and mineralization significance of the eastern side of sourthern Da Hinggan, China[J]. ACTA PETROLOGICA SINICA,2006,22(9):2289-2304. |
| APA | Zhang YongBei,Sun ShiHua,&Mao Qian.(2006).Mesozoic O-type adakitic volcanic rocks and its petrogenesis, paleo-tectonic dynamic and mineralization significance of the eastern side of sourthern Da Hinggan, China.ACTA PETROLOGICA SINICA,22(9),2289-2304. |
| MLA | Zhang YongBei,et al."Mesozoic O-type adakitic volcanic rocks and its petrogenesis, paleo-tectonic dynamic and mineralization significance of the eastern side of sourthern Da Hinggan, China".ACTA PETROLOGICA SINICA 22.9(2006):2289-2304. |
入库方式： OAI收割
来源：地质与地球物理研究所
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