Geochemistry and origin of neoarchean amphibolites in songshan, hennan province.
文献类型：期刊论文
| 作者 | Zhou YanYan1,3; Zhao TaiPing1; Xue LiangWei2; Wang ShiYan4 |
| 刊名 | Acta petrologica sinica
 |
| 出版日期 | 2009-11-01 |
| 卷号 | 25期号:11页码:3043-3056 |
| 关键词 | Dengfeng group Amphibolite Geochemistry North china craton |
| ISSN号 | 1000-0569 |
| 通讯作者 | Zhou yanyan(llylz_b3@163.com) |
| 英文摘要 | The dengfeng group in songshan area is a part of the ancient crystalline basement in the southern pail of the north china craton. the group mainly consists of metamorphosed volcanogenic and sedimentogenic supracrustal rocks, in which the amphibolite is a very common type. the amphibolite includes two types which occur as rock body in dengfeng group and as enclaves in ttg gneiss, respectively. both types have similar major components, they are all rich in fe(2)o(3), al(2)o(3), and cao but poor in tio(2) (ranging from 0.50% to 1.11%), and have sio(2) content ranging from 45% to 63%. these features indicate that they are orthometamorphite and are similar to sub-alkaline basalts and. andesite. nevertheless, the trace and rare earth element characteristics of amphibolites body in dengfeng group and amphibolites enclaves in ttg gneiss are different, the former has relatively flat bee pattern ((la/yb)(n) is from 0.99 to 2.07) with no eu anomalies (delta eu is about 1) on the chondrite-normalized ree patterns, and exhibit negative ti but positive ba and sr anomalies with slightly negative nb, ta and y anomalies on the primitive-mantle normalized spidergrams, similar to morb and island arc tholeiite. the whole rock nd isotopic compositions (epsilon(nd) (t) is 4.43) of the amphibolite body indicate that they may originate from a depleted mantle. in contrast, the enclaves in ttg gneiss have relatively higher hree/hree ratios with negative eu anomalies (delta eu = 0.46 to 0.87). it has higher rb, cs' and ba contents but lower ti content than the amphibolites body, and exhibits negative nb, ta and y anomalies, similar to island arc basalts. the whole rock nd isotopic compositions (epsilon(nd) (t) are 2.56 and 4.08) indicate that the enclaves may originate from a depleted mantle with the assimilation of older crust. we propose that the amphibolite body in dengfeng croup may have formed. by partial melting of mantle wedge in a subduction zone and erupted through the back-arc basin, whereas the enclaves in ttg geniss may have formed by partial melting of mantle wedge with assimilation of melts formed by slight partial melting of subducted oceanic slab. the geochemical characteristics of the both types of amphibolites indicate that the geodynamic background of dengfeng group is oceanic slab subducting in a convergent plate margin, reflecting that the continent crust in the neo-archean could grow in a parallel way. |
| WOS关键词 | WAWA GREENSTONE BELTS ; SUPERIOR PROVINCE ; TRACE-ELEMENT ; ARC MAGMAS ; ISOTOPIC SYSTEMATICS ; LREE SYSTEMATICS ; VOLCANIC-ROCKS ; ISLAND ARCS ; MANTLE ; ACCRETION |
| WOS研究方向 | Geology |
| WOS类目 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000273455000032 |
| 出版者 | SCIENCE PRESS |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2404744 |
| 专题 | 中国科学院大学 |
| 通讯作者 | Zhou YanYan |
| 作者单位 | 1.Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China 2.Henan Sci Res Inst Land Resources, Zhengzhou 450053, Peoples R China 3.Chinese Acad Sci, Grad Univ, Beijing 100039, Peoples R China 4.Henan Inst Geol Survey, Zhengzhou 450001, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhou YanYan,Zhao TaiPing,Xue LiangWei,et al. Geochemistry and origin of neoarchean amphibolites in songshan, hennan province.[J]. Acta petrologica sinica,2009,25(11):3043-3056. |
| APA | Zhou YanYan,Zhao TaiPing,Xue LiangWei,&Wang ShiYan.(2009).Geochemistry and origin of neoarchean amphibolites in songshan, hennan province..Acta petrologica sinica,25(11),3043-3056. |
| MLA | Zhou YanYan,et al."Geochemistry and origin of neoarchean amphibolites in songshan, hennan province.".Acta petrologica sinica 25.11(2009):3043-3056. |
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来源：中国科学院大学
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