Multistage amphiboles from the Galinge iron skarn deposit in Qiman Tagh,   western China: evidence of igneous rocks replacement

doi:10.1007/s00710-016-0459-x

CORC > 北京大学 > 地球与空间科学学院

	Multistage amphiboles from the Galinge iron skarn deposit in Qiman Tagh, western China: evidence of igneous rocks replacement
	Yu, M. ; Feng, C.Y. ; Zhu, Y.F. ; Mao, J.W. ; Zhao, Y.M. ; Li, D.X.
刊名	MINERALOGY AND PETROLOGY
	2017
关键词	Galinge skarn Fe deposit Qiman Tagh metallogenic belt Amphibole Fe-Ti oxides Hydrothermal fluids QINGHAI PROVINCE HYDROTHERMAL FLUIDS CL INCORPORATION MELT EQUILIBRIA ORE-DEPOSITS MAGNETITE CHLORINE NOMENCLATURE HASTINGSITE SYSTEMS
DOI	10.1007/s00710-016-0459-x
英文摘要	Amphiboles from the Galinge skarn deposit, the largest iron (Fe) polymetallic skarn deposit in the Qiman Tagh metallogenic belt (western China), were formed by multistage fluid-rock interactions. Mineral analysis of the various amphiboles suggest that they were formed by the replacement of mafic to intermediate igneous rocks. The two alteration phases have formed three generations of compositionally distinct amphiboles: Amp-I: Ferro-edenitic hornblende (FE); Amp-II: Deep bluish-green magnesian-hastingsite (MH); Amp-III: Light greenish-beige ferro-actinolite (FA). The Amp-I preserves the primary igneous amphibole composition, and was subsequently replaced by Amp-II. The amphibole Cl content markedly increases from the FE (0.176 - 0.582 wt.%) to the MH (0.894 - 3.161 wt.%), and abruptly drops in the FA (0.017 - 0.039 wt.%). The Cl-rich MH contains the lowest concentration of Si [5.64 - 6.28 atoms per formula unit (apfu)], and the highest (K + Na) values (0.72 - 1.06 apfu) in the amphibole A-site with a high K/(K + Na) of 0.491 to 0.429. Both Mg and Fe contents of the MH and FA vary widely, possibly due to the interactions of magma-derived hydrothermal fluids with the basaltic / andesitic host rocks. Formation of the Cl-rich MH may have been associated with the early high-temperature and high-saline hydrothermal fluids, meanwhile the Cl-poor FA may have formed from later low-temperature and low-saline hydrothermal fluids. The MH plays an important role for consuming Cl carried by hydrothermal fluids. The Cl-rich fluids may have mobilized some elements, such as Fe, Al, Mg, Ca and Ti from the host rocks. Considerable amounts of Ti, Al, Mg and Fe were incorporated into the sphene and Fe-Ti oxides that coexist with the MH.; National Natural Science Foundation of China [41172076]; Program of High-level Geological Talents [201309]; Youth Geological Talents of the China Geological Survey [201112]; Geological Survey Program from the China Geological Survey [1212011085528]; Scientific Research Fund of the Non-Commercial Unit from Ministry of Land and Resources, China [201411025]; SCI(E); ARTICLE; 1; 81-97; 111
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/475535]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Yu, M.,Feng, C.Y.,Zhu, Y.F.,et al. Multistage amphiboles from the Galinge iron skarn deposit in Qiman Tagh, western China: evidence of igneous rocks replacement[J]. MINERALOGY AND PETROLOGY,2017.
APA	Yu, M.,Feng, C.Y.,Zhu, Y.F.,Mao, J.W.,Zhao, Y.M.,&Li, D.X..(2017).Multistage amphiboles from the Galinge iron skarn deposit in Qiman Tagh, western China: evidence of igneous rocks replacement.MINERALOGY AND PETROLOGY.
MLA	Yu, M.,et al."Multistage amphiboles from the Galinge iron skarn deposit in Qiman Tagh, western China: evidence of igneous rocks replacement".MINERALOGY AND PETROLOGY (2017).