中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
首页 机构 成果 学者
  
  1. CAS IR Grid
  2. 地质与地球物理研究所
  3. 中国科学院地质与地球物理研究所
  4. 中国科学院矿产资源研究重点实验室
Nitrogen and oxygen isotopic profiles and redox structure across the Chinese Altay reveal the source rocks of granites, core of the Central Asian Orogenic Belt

文献类型：期刊论文

作者Liu, Wei1,4; Feng, Lianjun1,4,5; Liu, Xiujin1,2,4; Li, Tiejun1,4; Li, Hongwei1,4,5; Pan, Xiaofei3; Si, Cuiqin1,4,5
刊名LITHOS
出版日期2023-12-15
卷号462页码:18
ISSN号0024-4937
关键词N-O isotopes Redox environment Underlying series Overlying series Source rock tracing Chinese Altay granite
DOI10.1016/j.lithos.2023.107392
英文摘要Two rock series in the Chinese Altay (CA) were identified. The protoliths of the overlying series are fine sandstone and siltstone that consist of quartz and clay but contain little feldspar. The underlying series includes biotite-plagioclase gneiss and amphibolite entrained by the CA granite, migmatitic granite and the EarlyDevonian Kangbutiebao Fm. as the uncovered, latest-formed southwestern margin. The CA granites include oligoclase microcline granite and biotite plagioclase granite that exhibit extensive K-Na-metasomatism of plagioclase porphyroclast. The two series both have high positive epsilon Nd-epsilon Hf values but are N-O isotopically distinguishable. This study employed N-O isotopes to trace source rocks of the CA granites and to explore devolatilization from metamorphism, migmatization to partial melting. The overlying series yielded much higher N content (20.2-484 ppm; average: 87.3 +/- 99.0 ppm; 1 sigma; n = 36), delta 15N (- 3-19%o; average: 5.8 +/- 4.3%o; n = 36) and delta 18O (6.9-15.6%o; average: 13.6 +/- 3.05%o; n = 29) than the underlying series that yielded N (9.9-71.1 ppm; average: 32 +/- 17.1 ppm; n = 22), delta 15N (- 7.3-8.1%o; average: 1.1 +/- 4.7%o; n = 22) and delta 18O (4.5-12.1%o; average: 8.8 +/- 1.9%o; n = 22). The protoliths of the overlying series were accumulated on oxic shallow sea in the CA and, hence, recorded high delta 15N, whereas the protoliths of the underlying series extended to anoxic deep-ocean and experienced high-temperature seawater reaction, which resulted in low delta 18O and delta 15N values of the protoliths of the underlying series. The CA granites yielded much lower N content, delta 15N and delta 18O than the overlying series but have values overlapping those of the underlying series with a marginal increase in delta 18O. The delta 15N values tend to increase with decreasing element normalized-N contents from the underlying series to the CA granites, suggesting that migmatization and partial melting of the underlying series have caused 15N/14N fractionation. Quantitative modeling demonstrates that NH3 devolatilization of the underlying series at 550 to 750 degrees C can fit the underlying series and the CA granites, whereas 15N/14N fractionation trajectories of the overlying series miss the CA granites. These results suggest that the CA granites have been derived from the underlying series. Most data of the underlying series and the CA granites can be modeled by Rayleigh distillation suggesting escape of degassed NH3 from essentially solid-state protolith/ source rock from metamorphism to migmatization. Partial conversion to N2 or N2O caused 15N-enrichment in the two series at the leading edge of the overlying series, the eastern CA. The magma derived from the underlying series mixed with magma stemming from the metasomatized mantle with contribution from country rockderived fluid result in high delta 15N of the Qinggeli granodiorite and microdioritic enclaves.
WOS关键词CONTINENTAL-CRUST GROWTH ; ZIRCON U-PB ; METASEDIMENTARY ROCKS ; AMMONIUM ; FRACTIONATIONS ; EVOLUTION ; WATER ; PETROGENESIS ; METAMORPHISM ; TRANSITION
资助项目National Natural Science Foundation of China[91962213] ; National Natural Science Foundation of China[41573030] ; National Natural Science Foundation of China[41273019] ; National Natural Science Foundation of China[92062104] ; National Natural Science Foundation of China[41873059] ; Chinese Academy of Sciences[GJHZ2059] ; Chinese Academy of Sciences[KZCX2-YW-JS109]
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
出版者ELSEVIER
WOS记录号WOS:001110897000001
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences
源URL[http://ir.iggcas.ac.cn/handle/132A11/111169]  
专题地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者Liu, Wei
作者单位1.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China
2.Chinese Acad Geol Sci, Inst Geophys & Geochem Explorat, Key Lab Geochem Cycling Carbon & Mercury Earths Cr, Langfang 065000, Hebei, Peoples R China
3.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China
4.Chinese Acad Sci, Key Lab Mineral Resources, Inst Geol & Geophys, Beijing 100029, Peoples R China
5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Liu, Wei,Feng, Lianjun,Liu, Xiujin,et al. Nitrogen and oxygen isotopic profiles and redox structure across the Chinese Altay reveal the source rocks of granites, core of the Central Asian Orogenic Belt[J]. LITHOS,2023,462:18.
APA Liu, Wei.,Feng, Lianjun.,Liu, Xiujin.,Li, Tiejun.,Li, Hongwei.,...&Si, Cuiqin.(2023).Nitrogen and oxygen isotopic profiles and redox structure across the Chinese Altay reveal the source rocks of granites, core of the Central Asian Orogenic Belt.LITHOS,462,18.
MLA Liu, Wei,et al."Nitrogen and oxygen isotopic profiles and redox structure across the Chinese Altay reveal the source rocks of granites, core of the Central Asian Orogenic Belt".LITHOS 462(2023):18.

入库方式： OAI收割

来源：地质与地球物理研究所

浏览0
下载0
收藏0
其他版本

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。