Origin of late mesozoic intermediate-felsic volcanic rocks from the northern da hinggan mountain, ne china.
文献类型：期刊论文
| 作者 | Gao, XF; Feng, G; Fan, WM; Li, CW; Li, XY |
| 刊名 | Acta petrologica sinica
 |
| 出版日期 | 2005-05-01 |
| 卷号 | 21期号:3页码:737-748 |
| 关键词 | Geochemistry Petrogenesis Intermediate-felsic volcanic rocks Late mesozoic Southern da hinggan mountain |
| ISSN号 | 1000-0569 |
| 英文摘要 | Major, trace element and sr-nd isotope data of two types late mesozoic intermediate-felsic volcanic rocks from the southern da hinggan mountain, ne china are reported in this paper. one type is represented by the andesite-dacites and rhyolites occurring in the manketou'ebo formation (fm). these rocks span a sio(2) range of 60 similar to 74.9% and mgo range of 0.36 - 2.04%, characterized by moderate lree/hree fractionation (ce/yb(cn) = 2.6 similar to 3.0), strong lile enrichment and variable nb-ta and ti-p-sr depletion. they have more radiogenic sr and less radiogenic nd isotopic compositions ((87)sr/(86)sr(i) = 0.70522 - 0.70709; epsilon(nd) (t) = -1.5 similar to -0.4) than the contemporaneous basaltic lavas. in combination with the spatial coexistence between them and the basaltic lavas, we interpret these melts as differentiates of the primary basaltic magmas via variable degrees of fractional crystallization or assimilation and fractional crystallization (afc). the other type of intermediate-felsic lavas occurs in the manitu fro. they are dacites rich in al(2)o(3) (15.87 similar to 16.36%) and na(2)o (4.63 similar to 4.79%, k(2)o/na(2)o < 0.4), high sr (709 similar to 832 mu g/g) and low y (6.9 similar to 10.4 mu g/g) and hree (e.g. yb = 0.37 similar to 0.51 mu g/g), signatures of modem adakites from the subduction zones. compared with the basaltic lavas, they have less radiogenic sr but more radiogenic nd isotopic compositions ((87)sr/(86)sr(i) = 0.70409 similar to 0.70425; epsilon(nd) (t) = +0. 9 similar to +2.1), arguing against an origin of differentiates of the contemporaneous basalts. these rocks are considered as melts of mafic protoliths from the lower crust beneath the orogen under the heating of the underplating basaltic magmas. the adakitic trace element features suggest the presence of garnet and amphibole during melting with decomposition of plagioclase. the petrogenesis of these two types late mesozoic intermediate-felsic rocks favors a lithospheric extension model in post-orogenic stage, during which mantle-derived basalts underwent extensive differentiation or afc, or underplated into the lower crust to provide heat for anatexis of the mafic protoliths to produce the wide spectrum of intermediate-felsic melts in the ne china orogenic belt. |
| WOS关键词 | I-TYPE GRANITES ; NORTHEASTERN CHINA ; INNER-MONGOLIA ; CRUSTAL GROWTH ; GEOCHEMICAL CONSTRAINTS ; CONTINENTAL-CRUST ; FLAT SUBDUCTION ; PARTIAL MELTS ; U-PB ; PETROGENESIS |
| WOS研究方向 | Geology |
| WOS类目 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000231179000014 |
| 出版者 | SCIENCE PRESS |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2377204 |
| 专题 | 中国科学院大学 |
| 作者单位 | 1.Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Marginal Sea Geol, Guangzhou 510640, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China |
| 推荐引用方式 GB/T 7714 | Gao, XF,Feng, G,Fan, WM,et al. Origin of late mesozoic intermediate-felsic volcanic rocks from the northern da hinggan mountain, ne china.[J]. Acta petrologica sinica,2005,21(3):737-748. |
| APA | Gao, XF,Feng, G,Fan, WM,Li, CW,&Li, XY.(2005).Origin of late mesozoic intermediate-felsic volcanic rocks from the northern da hinggan mountain, ne china..Acta petrologica sinica,21(3),737-748. |
| MLA | Gao, XF,et al."Origin of late mesozoic intermediate-felsic volcanic rocks from the northern da hinggan mountain, ne china.".Acta petrologica sinica 21.3(2005):737-748. |
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来源：中国科学院大学
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