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Late-Eocene Dala adakitic granite, southern Tibet and geological implications. | |
Xie KeJia; Zeng LingSen; Liu Jing; Gao LiE | |
通讯作者 | Xie, KJ (通讯作者) |
发表日期 | 2010 |
ISSN | 1000-0569 |
EISSN | 2095-8927 |
起始页码 | 1016 |
结束页码 | 1026 |
卷号 | 26期号:4 |
英文摘要 | The Dala two-mica granite intruded into the Yardoi gneiss dome and is located to the southeastern of the Yardoi gneiss dome. It consists of quartz, plagioclase, and K-feldspar with subordinate biotite and muscovite and formed at similar to 44.0Ma. Geochemical data show that the Dala granite has (1) high Al2O3(16.0% similar to 17.0%), Na2O/K2O ratios (>1.20) and A/CNK(>1.05); (2) highly enriched in LREE ((La/Yb)(N) =39.5 similar to 45.5) and depleted in HREE ((Gd/Yb)(N) =5.5 similar to 6.4), slightly negative or no Eu anomalies; (3) relatively high Sr concentrations (355 x 10(-6) similar to 416 x 10(-6)) and Sr/Y ratios (>59.0); (4) relatively radiogenic Sr (Sr-87/Sr-86(i) =0.71754 similar to 0.71785) and unradiogenic Nd (epsilon(Nd)(i) = -9.2 similar to -12.4) isotope compositions, similar to those in the younger (similar to 35 Ma) leucogranites within the Yardoi gneiss dome. High Sr/Y and (La/Yb) N ratios, and Sr contents, but low Y and HREE concentrations in the Dala granite suggests it is of an adakitic composition. Our data suggest that the Dala granite was derived from partial melting of mafic lower crustal materials in the overthickened Himalayan orogenic belt, and amphibolite melting was dominant in the early stages of Himalayan magmatism. |
关键词 | HIGH-FIELD-STRENGTHSLAB-DERIVED MELTSYARDOI GNEISS DOMELANGTANG VALLEYMETAMORPHIC SEQUENCETETHYAN HIMALAYARARE-EARTHCRUSTORIGINANATEXIS |
英文关键词 | Dala pluton; Yardoi gneiss dome; Two-mica granite; Partial melting; Northern Himalayan Gneiss Dome |
语种 | 英语 |
WOS研究方向 | Geology |
WOS类目 | Geology |
WOS记录号 | WOS:000277950600002 |
来源期刊 | ACTA PETROLOGICA SINICA
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来源机构 | 中国科学院青藏高原研究所 |
文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/257738 |
推荐引用方式 GB/T 7714 | Xie KeJia,Zeng LingSen,Liu Jing,et al. Late-Eocene Dala adakitic granite, southern Tibet and geological implications.[J]. 中国科学院青藏高原研究所,2010,26(4). |
APA | Xie KeJia,Zeng LingSen,Liu Jing,&Gao LiE.(2010).Late-Eocene Dala adakitic granite, southern Tibet and geological implications..ACTA PETROLOGICA SINICA,26(4). |
MLA | Xie KeJia,et al."Late-Eocene Dala adakitic granite, southern Tibet and geological implications.".ACTA PETROLOGICA SINICA 26.4(2010). |
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