<正>长江中下游宁芜盆地发育一系列Kiruna型铁矿(Hou et al.,2009)。这些铁矿的成因至今还存在很大争议,争议的焦点集中在究竟是岩浆成因还是热液成因。根据我们在姑山铁矿的野外观察,例如矿石中的气孔和杏仁体,大量出现的角砾状...<正>长江中下游宁芜盆地发育一系列Kiruna型铁矿(Hou et al.,2009)。这些铁矿的成因至今还存在很大争议,争议的焦点集中在究竟是岩浆成因还是热液成因。根据我们在姑山铁矿的野外观察,例如矿石中的气孔和杏仁体,大量出现的角砾状矿石以及块状矿石中出现的流动构造等,结合前人发表的大量数据,例如磁铁矿中包裹体较高的均一温度(~1 000℃;翟裕生等1992),这些铁矿应该是岩浆成因的。闪长玢岩中,展开更多
The Khanlogh deposit in the Cenozoic Quchan-Sabzevar magmatic belt, NE Iran, is hosted by Oligocene granodioritic rock. The Khanlogh intrusive body is I-type granitoid of the calc-alkaline series. The orebodies are ve...The Khanlogh deposit in the Cenozoic Quchan-Sabzevar magmatic belt, NE Iran, is hosted by Oligocene granodioritic rock. The Khanlogh intrusive body is I-type granitoid of the calc-alkaline series. The orebodies are vein, veinlet, massive, and breccia in shape and occur along the fault zones and fractures within the host rock. Ore minerals dominantly comprise magnetite and apatite associated with epidote, clinopyroxene, calcite, quartz, and chlorite. Apatites of the Khanlogh deposit have a high concentration of REE, and show a strong LREE/HREE ratio with a pronounced negative Eu anomaly. Magnetites have a high concentration of REE and show weak to moderate LREE/HREE fractionation. They are comparable to the REE patterns in Kiruna-type iron ores and show an affinity to calc-alkaline magmas. The Khanlogh deposit is similar in the aspects of host rock lithology, alteration, mineralogy, and mineral chemistry to the Kiruna-type deposits. Field observations, hydrothermal alteration halos, style of mineralization, and the geochemical characteristics of apatite, magnetite, and host rock indicate that these magnetite veins have hydrothermal origin similar to Cenozoic Kiruna-type deposits within the Tarom subzone, NW Iran, and are not related to silica-iron oxide immiscibility, as are the major Precambrian magnetite deposits in central Iran.展开更多
This paper presents an overview about the XIV iron-oxide prospect which is located in the Bafq mining district, central Iran. The prospect and its host rocks were investigated by field observations together with miner...This paper presents an overview about the XIV iron-oxide prospect which is located in the Bafq mining district, central Iran. The prospect and its host rocks were investigated by field observations together with mineralogical and geochemical studies. According to these investigations, the XIV prospect is similar to Kiruna-type iron deposits and demonstrates a magmatic source for the ore forming processes with a metasomatic overprinting.展开更多
文摘<正>长江中下游宁芜盆地发育一系列Kiruna型铁矿(Hou et al.,2009)。这些铁矿的成因至今还存在很大争议,争议的焦点集中在究竟是岩浆成因还是热液成因。根据我们在姑山铁矿的野外观察,例如矿石中的气孔和杏仁体,大量出现的角砾状矿石以及块状矿石中出现的流动构造等,结合前人发表的大量数据,例如磁铁矿中包裹体较高的均一温度(~1 000℃;翟裕生等1992),这些铁矿应该是岩浆成因的。闪长玢岩中,
基金funded by the Ferdowsi University of Mashhad Research Grant Council
文摘The Khanlogh deposit in the Cenozoic Quchan-Sabzevar magmatic belt, NE Iran, is hosted by Oligocene granodioritic rock. The Khanlogh intrusive body is I-type granitoid of the calc-alkaline series. The orebodies are vein, veinlet, massive, and breccia in shape and occur along the fault zones and fractures within the host rock. Ore minerals dominantly comprise magnetite and apatite associated with epidote, clinopyroxene, calcite, quartz, and chlorite. Apatites of the Khanlogh deposit have a high concentration of REE, and show a strong LREE/HREE ratio with a pronounced negative Eu anomaly. Magnetites have a high concentration of REE and show weak to moderate LREE/HREE fractionation. They are comparable to the REE patterns in Kiruna-type iron ores and show an affinity to calc-alkaline magmas. The Khanlogh deposit is similar in the aspects of host rock lithology, alteration, mineralogy, and mineral chemistry to the Kiruna-type deposits. Field observations, hydrothermal alteration halos, style of mineralization, and the geochemical characteristics of apatite, magnetite, and host rock indicate that these magnetite veins have hydrothermal origin similar to Cenozoic Kiruna-type deposits within the Tarom subzone, NW Iran, and are not related to silica-iron oxide immiscibility, as are the major Precambrian magnetite deposits in central Iran.
文摘This paper presents an overview about the XIV iron-oxide prospect which is located in the Bafq mining district, central Iran. The prospect and its host rocks were investigated by field observations together with mineralogical and geochemical studies. According to these investigations, the XIV prospect is similar to Kiruna-type iron deposits and demonstrates a magmatic source for the ore forming processes with a metasomatic overprinting.
