Geochronology and fluid inclusion study of the Shabutai porphyry Mo   deposit, Inner Mongolia

doi:10.1016/j.oregeorev.2016.10.027

CORC > 北京大学 > 地球与空间科学学院

	Geochronology and fluid inclusion study of the Shabutai porphyry Mo deposit, Inner Mongolia
	Zhou, Yitao ; Lai, Yong ; Shu, Qihai ; Sun, Yi ; Xu, Jiajia ; Liang, Yuwei
刊名	ORE GEOLOGY REVIEWS
	2017
关键词	Xilamulun molybdenum belt Shabutai porphyry molybdenum deposit Fluid inclusion Zircon U-Pb age Mineralization mechanism NORTH CHINA CRATON XILAMULUN METALLOGENIC BELT MOLYBDENUM-COPPER DEPOSIT FREEZING-POINT DEPRESSION I-TYPE GRANITES CU DEPOSIT NE CHINA U-PB GEOCHEMICAL CHARACTERISTICS MINERALIZATION CHRONOLOGY
DOI	10.1016/j.oregeorev.2016.10.027
英文摘要	The Shabutai molybdenum deposit is a newly discovered deposit located in the northern part of the Xilamulun metallogenic belt Molybdenum mineralization is distributed in granite porphyry and its exocontact zone is in the shape of quartz veins. The LA-ICP-MS zircon U-Pb age of ore-bearing granite porphyry is 140.1 +/- 0.7 Ma with a MSDW of 0.078. The granite belongs to the high-K talc-alkaline series characterized by relatively high LREE, low HREE, depletion of Ti, Ba, and Nb, and a negative Eu anomaly. Mineralization evolution is divided into three stages: early, middle and late. The stages are characterized by potassium feldspar veins, quartz potassium feldspar veins, and quartz veins in the early stage, quartz-molybdenite veins in the middle stage, and quartz-carbonate veins in the late stage. Ore minerals were mainly precipitated in the middle stage. Pure vapor (PV), vapor-rich (V), liquid-rich (L), and daughter mineral-bearing (S) fluid inclusions were observed in the hydrothermal quartz. Homogeneous temperatures of fluid inclusions in the early stage ranged from 240 degrees C to 420 degrees C, with salinities ranging from 4.0 to 57.2 wt.% NaCleqv. The fluid inclusions contained hematite daughter minerals, indicating high oxygen fugacity conditions in the early stage. The temperatures of the fluid inclusions at the middle stage ranged predominantly from 200 to 300 degrees C with a salinity range of 0.5-48.5 wt.% NaCleqv. The inclusions also showed high K ion content characteristics, both in the early and middle stage fluid. A drop in potassium concentration caused by potassic alteration created a favorable condition for Mo precipitation. The temperature range of the late-stage fluid inclusions was 160-307 degrees C with salinities below 10.7 wt.% NaCl eqv. According to Laser Raman microprobe data, CO2 occurred only in a few gas fluid inclusions, while most gases were H2O. Microthermomedic analysis results suggested that fluid boiling was the main factor triggering molybdenite precipitate and forming the Shabutai molybdenum deposit. (C) 2016 Elsevier B.V. All rights reserved.; National Natural Science Foundation of China [41390443]; SCI(E); ARTICLE; ,SI; 745-759; 81
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/475004]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Zhou, Yitao,Lai, Yong,Shu, Qihai,et al. Geochronology and fluid inclusion study of the Shabutai porphyry Mo deposit, Inner Mongolia[J]. ORE GEOLOGY REVIEWS,2017.
APA	Zhou, Yitao,Lai, Yong,Shu, Qihai,Sun, Yi,Xu, Jiajia,&Liang, Yuwei.(2017).Geochronology and fluid inclusion study of the Shabutai porphyry Mo deposit, Inner Mongolia.ORE GEOLOGY REVIEWS.
MLA	Zhou, Yitao,et al."Geochronology and fluid inclusion study of the Shabutai porphyry Mo deposit, Inner Mongolia".ORE GEOLOGY REVIEWS (2017).