(1. 中南大學(xué) 有色金屬成礦預(yù)測教育部重點實驗室，長沙 410083;
2. 中南大學(xué) 地球科學(xué)與信息物理學(xué)院，長沙 410083; 3. 有色金屬華東地質(zhì)勘查局，南京 210007;
4. 南京大學(xué) 地球科學(xué)與工程學(xué)院，內(nèi)生金屬礦床成礦機制研究國家重點實驗室，南京 210093)
摘 要: 新疆哈密星星峽白石頭泉天河石花崗巖從下往上分為5個巖相帶，即淡色花崗巖、含天河石花崗巖、天河石花崗巖、含黃玉天河石花崗巖和黃玉鈉長花崗巖。各相帶中都有一些巖漿晚期形成的不規(guī)則狀孔洞。孔洞多小于2 mm，其充填物以螢石為主，并有石榴石、錫石、鈉長石和白色云母等。這些充填物是巖漿−熱液過渡階段晚期的產(chǎn)物。充填物的成分表明，貧鈣鎂鐵而富氟的過鋁花崗巖，其巖漿−熱液過渡階段的晚期產(chǎn)物以含大量螢石為特征，并表明氟化物或氟絡(luò)合物是該階段流體中錫的重要搬運形式。該階段初步富集錫的孔洞流體如因構(gòu)造裂隙貫通而發(fā)生運移，就可能在有利地段聚集，形成脈狀錫礦床。
關(guān)鍵字: 天河石；黃玉；花崗巖；巖漿−熱液過渡；白石頭泉；東天山
transition of Baishitouquan amazonite granite, Eastern Tianshan
GU Lian-xing3, 4, LIU Jian-xin1, 2, CAO Chuang-hua1,
（1. Key Laboratory of Metallogenic Prediction of Nonferrous Metals, Ministry of Education,
Central South University, Changsha 410083, China;
2. School of Geosciences and Info-Physics, Central South University, Changsha 410083, China;
3. East China Mineral Exploration and Development Bureau for Non-Ferrous metals, Nanjing 210007, China;
4. State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering,
Nanjing University, Nanjing 210093, China）
Abstract:The Baishitouquan amazonite granite pluton near Xinxinxia of Hami County, Xinjiang, China, includes five lithological zones. They are, up the pluton, the leucogranite zone, amazonite-bearing granite zone, amazonite granite zone, topaz-bearing amazonite granite zone and topaz albite granite zone. Irregular-shaped cavities formed during the late magmatic stage are found in all the five zones. These cavities, mostly less than 2 mm in size, were filled dominantly with fluorite accompanied by garnet, cassiterite, albite and white mica. These infilling minerals were crystallized late at the magmatic-hydrothermal transition stage. The composition of the infillings indicates that the product at this stage is an evolving calcium-, magnesium-, and iron-poor and fluorine-rich peraluminous granite, which is characterized by abundant fluorite, and that the fluorides or fluorine complexes are the important forms that transport tin in fluids at this stage. In case the cavities are connected by tectonic fractures, the tin initially enriched in the infilling fluids will migrate and then precipitate the metallic minerals at favorable sites with formation of a vein-type tin deposit.
Key words: amazonite; topaz; granite; magmatic-hydrothermal transition; Baishitouquan; Eastern Tianshan
