Redox state and water content changes of magma during amphibole accumulation process: Tongling example
Redox state and water content changes of magma during amphibole accumulation process: Tongling example
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角闪石堆积过程中岩浆氧化还原状态和含水量变化——铜陵实例
DOI：
10.1016/j.oregeorev.2021.104523
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发表时间：
2021-10
影响因子：
3.3
通讯作者：
Du Yangsong
中科院分区：
文献类型：
--
作者：
Du Jingguo;Mao Jingwen;Du Yangsong
通过对铜陵矿群中富角闪石堆晶岩捕虏体及其斑岩寄主中磷灰石的岩相学研究、原位主量元素、微量元素和Sr-Nd同位素分析，探讨了角闪石主导的分异作用控制衍生熔体氧化还原状态和水含量的机制。磷灰石是典型的富F组分占主导地位，与增加OH和SO 3含量从原始堆晶演化斑岩主机。球粒陨石归一化的稀土元素（REE）模式的磷灰石是右倾斜的强烈轻稀土富集，负Eu异常是更明显的磷灰石从斑岩主机比从堆晶。斜长石先于磷灰石结晶是控制磷灰石稀土元素含量、配分模式和Sr含量差异的主要因素。我们的结论是角闪石为主的岩浆分异只有微弱的影响，熔体的氧化还原状态，但可以有效地增加衍生熔体的水含量;氧化的斑岩性质是从他们的来源继承。在斑岩铜矿化系统中，深部积累过程可能会抵消硫化物饱和引起的金属损失，因为它的功能是增加演化熔体的含水量。
The mechanism by which amphibole-dominated differentiation controls the redox state and water content of derivative melt was explored through petrographic studies andin situmajor- and trace-element and Sr–Nd isotope analyses of apatites from amphibole-rich cumulate xenoliths and their porphyry hosts in the Tongling ore cluster, China. Apatite is typically dominated by F-rich components, with increasing OH and SO3contents from primitive cumulates to evolved porphyry hosts. Chondrite-normalised rare-earth-element (REE) patterns of apatites are right-inclined with strong light REE enrichment; the negative Eu anomaly is more pronounced in apatites from porphyry hosts than in those from cumulates. Plagioclase crystallisation prior to apatite is a predominant factor controlling the contrasting differences in the REE contents and patterns and the Sr contents of apatites. We conclude that amphibole-dominated magma differentiation has only weak effects on the redox state of the melt but can efficiently increase the water content of derivative melt; the oxidised nature of the porphyries is inherited from their source. In porphyry Cu mineralisation systems, deep accumulation processes may offset metal loss incurred through sulphide saturation as its function in increasing the water content of evolved melts.
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影响因子：
4.9
作者：
P. Wallace;T. Plank;M. Edmonds;E. Hauri
通讯作者：
P. Wallace;T. Plank;M. Edmonds;E. Hauri
影响因子：
3.5
作者：
Shiwei Wang;Taofa Zhou;F. Yuan;Yu Fan;D. Cooke;Lejun Zhang;B. Fu;N. White
通讯作者：
Shiwei Wang;Taofa Zhou;F. Yuan;Yu Fan;D. Cooke;Lejun Zhang;B. Fu;N. White
DOI：
10.1098/rsta.1991.0052
发表时间：
1991-05-15
期刊：
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
影响因子：
--
作者：
AYERS, JC;WATSON, EB
通讯作者：
WATSON, EB
影响因子：
3.8
作者：
Jing‐Liang Guo;Shan Gao;Y. Wu;Ming Li;Kang Chen;Zhaochu Hu;Zhengwei Liang;Yongsheng Liu;
通讯作者：
Jing‐Liang Guo;Shan Gao;Y. Wu;Ming Li;Kang Chen;Zhaochu Hu;Zhengwei Liang;Yongsheng Liu;
影响因子：
13.6
作者：
Ming Tang;Cin-Ty A. Lee;Weiqiang Ji;Rui Wang;G. Costin
通讯作者：
Ming Tang;Cin-Ty A. Lee;Weiqiang Ji;Rui Wang;G. Costin