Podiform chromitite genesis in an Archean juvenile forearc setting: The 2.55 Ga Zunhua chromitites, North China Craton
Podiform chromitite genesis in an Archean juvenile forearc setting: The 2.55 Ga Zunhua chromitites, North China Craton
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太古宙幼年弧前环境中的豆状铬铁矿成因：华北克拉通 2.55 Ga 遵化铬铁矿
DOI：
10.1016/j.lithos.2021.106194
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发表时间：
2021-08
期刊：
影响因子：
3.5
通讯作者：
Kusky Timothy
中科院分区：
文献类型：
--
作者：
Huang Yang;Wang Lu;Robinson Paul T.;Ning Wenbin;Zhong Yating;Wang Junpeng;Hu Wei;Polat Ali;Kusky Timothy
Podiform chromitites are unique rock units of ophiolites and ophiolitic mélanges and represent invaluable repositories that reliably record the formation environment and evolution of their source and host rocks. However, there are relatively few podiform chromitites reported from Archean terranes. Here we document the major, minor, and trace element characteristics of podiform chromitites from the Archean Zunhua ophiolitic mélange in the North China Craton. The Zunhua ophiolitic mélange includes blocks of serpentinized peridotite (dunite and harzburgite), podiform chromitite, pyroxenite, amphibolite, metabasites (basalt and diabase), chert, and tectonic lenses of banded iron formation in a strongly sheared metapelitic matrix. The chromitites, host peridotites, and granitic dikes cutting the mélange all have ages between 2.6 and 2.5 Ga. Chondrite-normalized, whole-rock platinum group element (PGE) patterns of the Zunhua chromitites show a negative sloping PGE trend enriched in Ir and depleted in Pt, similar to typical Phanerozoic podiform chromitites. The geochemical characteristics of the calculated parental magma of the Zunhua chromitites closely resemble those of podiform chromitites in Phanerozoic ophiolites and ophiolitic mélanges but different from those of continental stratiform chromite deposits. The calculated major, minor, and trace element concentrations of the parental melt of Zunhua chromitites are similar to those of boninitic melts found in forearc settings. Geochemical characteristics and calculated parental melt composition of the chromites with the high Mg# values of their host peridotites suggest that the Zunhua podiform chromitites formed by magmatic processes including reactions between boninitic melt and harzburgite in a supra-subduction zone environment.
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扬子克拉通元古界庙湾蛇绿岩杂岩橄榄岩中铬铁矿分带地球化学特征：对元素迁移率和构造环境的启示
DOI：
10.1007/s12583-019-1278-x
发表时间：
2020-04
期刊：
Journal of Earth Science,
影响因子：
--
作者：
Yang Huang;Hao Deng
通讯作者：
Hao Deng
影响因子：
3.5
作者：
S. Arai;Jiro Uesugi;A. H. Ahmed
通讯作者：
S. Arai;Jiro Uesugi;A. H. Ahmed
影响因子：
6.1
作者：
Guochun Zhao;M. Zhai
通讯作者：
Guochun Zhao;M. Zhai
影响因子：
3.5
作者：
S. Whattam;R. Stern
通讯作者：
S. Whattam;R. Stern
影响因子：
2.4
作者：
E. Saccani;Y. Dilek;A. Photiades
通讯作者：
E. Saccani;Y. Dilek;A. Photiades