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Fluid-rock interaction during subsolidus microtextural development of alkali granite as exemplified by the Saertielieke pluton,Ulungur of the northern Xinjiang,China

Fluid-rock interaction during subsolidus microtextural devel...

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中国科学院地质与地球物理研究所2002学术年会

作者： Wei Liu Research Center for Mineral Resources Exploration,Institute of Geology and Geophysics,CAS,POB 9701,A-11 Datun Rd.,Beijing 100101,People’s Republic of China

Three lithological GroupsⅠ(medium-grained,with magmatogenic arfvedsonite),Ⅱ(medium-grained,with secondary arfvedsonite) andⅢ(fine-grained,with magmatogenic arfvedsonite) are identified in the Saertielieke alkali granite pluton,Ulungur of the northern Xinjiang,China.A weak negative correlation between the O values of alkali feldspar and quartz separates from each group,and the distinctly lower O values of alkali feldspar separates from GroupsⅠandⅡthan those from GroupⅢare interpreted in terms of superimposed closed-system and open-system isotope exchange.A small amount of locally exsolved magmatic fluid is involved in the development of the perthitic texture in alkali feldspar at～400℃that results in a volume increase and,hence,causes quartz *** microtextural changes promote the closed-system oxygen isotope exchange between quartz and alkali feldspar that causes a dispersion in the quartz O ***,the distinctly lower O values of alkali feldspar and secondary arfvedsonite coupled with their microtextural characteristics indicate that meteoric-derived water plays an important role in the further development of alkali feldspar exsolution texture at Talkali feldspar,quartz,and secondary arfvedsonite have exchanged with meteoric-derived water mainly via dissolution-reprecipitation,whereas magmatogenic arfvedsonite has exchanged via diffusion.

关键词： Oxygen isotope Perthitic alkali feldspar Secondary arfvedsonite Deformation of quartz alkali granite

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Geochemical Study of Almoqlaq Intrusive Body in North of Asadabad in Hamedan Province, Iran

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Open Journal of Geology 2016年第1期6卷 47-57页

作者： Ahmad Farnin Islamic Azad University North Tehran Branch Tehran Iran

The study area is located in the west of Iran and in the north of Asadabad. This is the range between Eastern lengths of 00', 48° to 15', 48°, and northern latitudes of 45', 34° to 00', 35°. This range is limited from north to the asphalt road of Hamadan Qorveh, Sanandaj, and from the East and Southeast, to Asadabad of Kermanshah-Hamedan road, and from the West to Chahardoli plain and from the south to the plains and the town of Asadabad. According to the geological map of the study area, intrusive outcropping of diorite-gabbro of Almoqlaq, and quartz syenite is at Almoqlaq mountains. Intrusive rocks of the region, based on the total alkali oxide, against silica rocks of study area fall within the quartz monzonite, gabbro, granodiorite, granite, and syenite between quartz and alkali granite. And granite in the study area (due to aluminum saturation index), is in the range of metaluminous, and metaluminous to peraluminous. Based on normalized spider diagram with the upper crust, the typical study area belongs to this model, and most of the elements are placed near or on standard line of 1.

关键词： Almoqlaq Geochemistry Intrusion alkali granite Metaluminous Quartz Monzonite and Spider Diagram

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Oxygen Isotopic Characteristics of Granitic Intrusions Related to Haobugao Zn-Pb-Cu-Sn Skarn Deposit,East Inner Mongolia,China

Oxygen Isotopic Characteristics of Granitic Intrusions Relat...

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中国科学院地质与地球物理研究所2004学术年会

作者： Hidehiko SHIMAZAKI 23-9 Tokiwadaira-Nishikubo Matsudo 270-2266Japan

Granitic rocks related to the formation of Haobugao Zn-Pb-Cu-Sn skarn deposit,Inner Mongolia,China,show unusual low whole-rockδO values down to -8.8‰(V-SMOW),whereas separated quartz crystals from those rocks give positiveδO values of +4.1 to +9.9‰.Chemical analyses and microscopic observation of those granitic rocks confirm that they suffered hydrothermal *** skarn specimens and quartz from the Haobugao deposit also show negativeδO *** isotopic evidence indicates that intensive meteoric water circulation occurred at the time of granitic intrusion, and caused the pervasive hydrothermal alteration of granitic rocks and the precipitation of skarn deposit in this area.

关键词： Haobugao Zn-Pb-Cu-Sn skarn deposit Baiyinnuo Zn-Pb-Cu(-Sn) skarn deposit alkali granite oxygen isotopes meteoric water Inner Mongolia

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