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| Content Provider | Springer Nature Link |
|---|---|
| Author | Chen, Huan Xia, Qun ke Ingrin, Jannick |
| Copyright Year | 2015 |
| Abstract | Water has become an effective means to trace the mantle source of basaltic magmas recently. To investigate the source of the potassium-rich component in the Xiaogulihe ultrapotassic volcanic rocks of NE China, we measured the water content of clinopyroxene (cpx) phenocrysts by Fourier transform infrared spectrometry and calculated the H$_{2}$O content of the equilibrated melts according to the partition coefficients of H$_{2}$O between cpx phenocrysts and basaltic melts. The estimated H$_{2}$O content of the “primary” magmas is low (0.36 wt%–0.50 wt%), within the range of mid-ocean ridge basalts and ocean island basalts, while it is obviously lower than that of back-arc basin basalts and island arc basalts. The calculated H$_{2}$O/Ce ratio of the “primary” magmas is about 15, which might be similar to that of the dehydrated sediments (<100), but observably lower than that of the normal depleted mantle (DMM, H$_{2}$O/Ce = 150–210). The low water content and especially low H$_{2}$O/Ce ratio of the “primary” magmas demonstrate that the K-rich component of these ultrapotassic volcanic rocks seems unlikely to originate from K-bearing hydrous minerals (such as phlogopite) in metasomatic subcontinental lithospheric mantle. Combined with the low $^{206}$Pb/$^{204}$Pb ratios, moderately high $^{87}$Sr/$^{86}$Sr ratios of the bulk rocks and the high δ$^{18}$O values of olivine phenocrysts, we suggest that the K-rich component in the mantle source of the Xiaogulihe ultrapotassic volcanic rocks may come from ancient continental-derived sediments which dehydrated significantly during subduction (e.g., dry K-hollandite).为了研究小古里河高钾火山岩源区富钾组分的来源,分析并计算了“原始”熔体的水含量。结果显示小古里河火山岩的“原始”熔体具有低的H$_{2}$O含量特征 (0.38 ± 0.11 wt%),位于大洋中脊玄武岩(MORBs)和洋岛玄武岩(OIBs)之间。另外,“原始”熔体的H$_{2}$O/Ce比值约为15,显著低于亏损地幔端元(150–210),接近脱水沉积物组分(<100)。低的水含量和H$_{2}$O/Ce比值表明源区中富K组分不大可能来自于岩石圈地幔中的富钾含水矿物(如:金云母)。结合全岩低的$^{206}$Pb/$^{204}$Pb和较高的$^{87}$Sr/$^{86}$Sr以及橄榄石斑晶高的δ$^{18}$O特征,我们认为这种富钾组分很可能来自于地幔过渡带中经过强烈脱水的古老陆源俯冲沉积物(如:干的钾锰钡矿)。 |
| Starting Page | 1468 |
| Ending Page | 1470 |
| Page Count | 3 |
| File Format | |
| ISSN | 20959273 |
| Journal | Chinese Science Bulletin |
| Volume Number | 60 |
| Issue Number | 16 |
| e-ISSN | 20959281 |
| Language | Chinese |
| Publisher | Science China Press |
| Publisher Date | 2015-08-18 |
| Publisher Place | Beijing |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Ultrapotassic volcanic rocks NE China Water content Dehydrated sediments Science Life Sciences Physics Chemistry/Food Science Earth Sciences Engineering |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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