Abstract:The Dabaishitougou area in the northern margin of Tuolai South Mountain in middle Qilian Mountains, tectonically located in the mid-Qilian magmatic arc belt, belongs to the Caledonian W, rare metals, Cu(Ti, Sb, Au) metallogenic belt. The titanium magnetite mineralized bodies, obviously controlled by lithology and characterized by multistage mineralization, are mainly occurred in the gneiss member of Palaeoproterozoic Tuolai Group and the schist and quartzite members of Moshigou Formation of Mesoproterozoic Huangzhong Group. With petrographic observation, electron probe microanalysis(EPMA) and artificial heavy concentrate analysis, it is determined that the titanium minerals are dominated by titanium magnetite with minor ilmenite and trace rutile. The source of titanium minerals is discussed based on the in-depth study of metallogenic characteristics and occurrence state of titanium magnetite deposit. It is considered that the mineralization is of volcanic exhalation-sedimentary type, proving that the ore-forming materials are most likely from Ti-rich basic-ultrabasic volcanic rocks brought by volcanic eruption formed after the early fractional crystallization and accumulation rather than from the pegmatite body. It is the first time that titanium magnetite bodies have been found in Dabaishitougou area of middle Qilian Mountains through verification of documents. Thus the study results can provide a theoretical basis for follow-up exploration.
吴贤, 张健. 中国的钛资源分布及特点[J]. 钛工业进展, 2006, 23(6):8-12. Wu X, Zhang J. Geographical distribution and characteristics of titanium resources in China[J]. Titanium Industry Progress, 2006, 23(6):8-12.
[2]
丁建华, 张勇, 李立兴, 等. 中国钛矿成矿地质特征与资源潜力评价[J]. 中国地质, 2020, 47(3):627-644. Ding J H, Zhang Y, Li L X, et al. Metallogenic geological characteristics and titanium resources potential in China[J]. Geology in China, 2020, 47(3):627-644.
[3]
胡毅, 廖阮颖子, 张明胜, 等. 四川攀西红格钒钛磁铁矿床地质特征及找矿预测地质模型[J]. 矿产与地质, 2020, 34(4):655-661. Hu Y, Liao R Y Z, Zhang M S, et al. Geological characteristics and exploration prediction model of Hongge vanadium-titanium magnetite deposit in Panxi, Sichuan Province[J]. Mineral Resources and Geology, 2020, 34(4):655-661.
[4]
罗金华, 邱克辉, 张佩聪, 等. 红格钒钛磁铁矿中钛磁铁矿的矿物学特征研究[J]. 矿物岩石, 2013, 33(3):1-6. Luo J H, Qiu K H, Zhang P C, et al. Studies of mineralogical characteristics of titano-magnetite in Hongge vanadium titano-magnetite[J]. Journal of Mineralogy and Petrology, 2013, 33(3):1-6.
[5]
刘林, 高建利, 尚小社. 陕西铁佛寺钛磁铁矿地质特征及找矿前景[J]. 矿产勘查, 2012, 3(5):638-643. Liu L, Gao J L, Shang X S. Geological characteristics of Tiefosi titanium-magnetite deposit and prospecting potential, Shaanxi[J]. Mineral Exploration, 2012, 3(5):638-643.
[6]
张腾蛟, 李佑国, 张月姣, 等. 川西盐边县红格钒钛磁铁矿中镍钴硫化物的铂族元素地球化学特征[J]. 地质论评, 2017, 63(4):1050-1063. Zhang T J, Li Y G, Zhang Y J, et al. PGE geochemical characteristics of massive sulfide in V-Ti magnetite at Hongge area, Yanbian County, western Sichuan[J]. Geological Review, 2017, 63(4):1050-1063.
[7]
杨欢, 冶玉花, 王登科. 变质岩中金红石研究综述[J]. 四川地质学报, 2013, 33(1):120-125. Yang H, Ye Y H, Wang D K. On rutile in metamorphic rocks[J]. Acta Geologica Sichuan, 2013, 33(1):120-125.
[8]
徐少康. 我国金红石矿床成因类型及成矿区带[J]. 化工矿产地质, 2001, 23(1):11-18. Xu S K. Genetic types of mineralizing provinces of rutile deposits in China[J]. Geology of Chemical Minerals, 2001, 23(1):11-18.
[9]
张志彬, 黄菲, 刘开君, 等. 攀枝花钒钛磁铁矿中纳-微米尖晶石的出溶序次及其成因机制[J]. 地球科学, 2018, 43(5):1635-1649. Zhang Z B, Huang F, Liu K J, et al. Sequence and genetic mechanism of nano-micron spinel exsolution from Panzhihua V-Ti magnetite deposit[J]. Earth Science, 2018, 43(5):1635-1649.
[10]
郑文勤, 邓宇峰, 宋谢炎, 等. 攀枝花岩体钛铁矿成分特征及其成因意义[J]. 岩石学报, 2014, 30(5):1432-1442. Zheng W Q, Deng Y F, Song X Y, et al. Composition and genetic significance of the ilmenite of the Panzhihua intrusion[J]. Acta Petrologica Sinica, 2014, 30(5):1432-1442.
[11]
郭道军, 于海军, 王雪, 等. 攀枝花钒钛磁铁矿地质特征与成矿远景[J]. 四川地质学报, 2014, 34(4):523-528. Guo D J, Yu H J, Wang X, et al. Geological features and prospecting potential of the Panzhihua vanadic titanomagnetite deposit[J]. Acta Geologica Sichuan, 2014, 34(4):523-528.
[12]
张晓琪, 张加飞, 宋谢炎, 等. 斜长石和橄榄石成分对四川攀枝花钒钛磁铁矿床成因的指示意义[J]. 岩石学报, 2011, 27(12):3675-3688. Zhang X Q, Zhang J F, Song X Y, et al. Implications of compositions of plagioclase and olivine on the formation of the Panzhihua V-Ti magnetite deposit, Sichuan Province[J]. Acta Petrologica Sinica, 2011, 27(12):3675-3688.
[13]
赵一鸣, 李大新, 韩景仪, 等. 内蒙古羊蹄子山-磨石山钛矿床锐钛矿、金红石和钛铁矿的矿物学特征[J]. 矿床地质, 2008, 27(4):466-473. Zhao Y M, Li D X, Han J Y, et al. Mineralogical characteristics of anatase, rutile and ilmenite in Yangtizashan-Moshishan titanium ore deposit, Inner Mongolia[J]. Mineral Deposits, 2008, 27(4):466- 473.
[14]
郭涛, 林明明, 郭勇明, 等. 新疆若羌县沙河湾钛磁铁矿地质特征及找矿意义[J]. 西北地质, 2016, 49(3):99-106. Guo T, Lin M M, Guo Y M, et al. Geological characteristics and prospecting significance of Shahewan titanium magnetite deposit in Ruoqiang county, Xinjiang[J]. Northwestern Geology, 2016, 49(3):99-106.
[15]
邵建波, 李景光, 王洪涛, 等. 吉林白山五道羊岔新太古代大型钒钛磁铁矿床地质特征及锆石U-Pb年龄[J]. 中国地质, 2014, 41(2):463-483. Shao J B, Li J G, Wang H T, et al. Geological characteristics and zircon U-Pb age of the Wudaoyangcha Neoarchaean vanadic titanomagnetite deposit in Baishan, Jilin Province[J]. Geology in China, 2014, 41(2):463-483.
[16]
赵一鸣, 李大新, 陈文明, 等. 内蒙古羊蹄子山沉积变质型钛矿床——一个新的钛矿床类型的发现[J]. 矿床地质, 2006, 25(2):113-122. Zhao Y M, Li D X, Chen W M, et al. Yangtizishan metamorphosed sedimentary titanium deposit:Discovery of new genetic type of titanium deposit[J]. Mineral Deposits, 2006, 25(2):113-122.
[17]
赵一鸣, 李大新, 吴良士, 等. 内蒙古磨石山沉积变质型锐钛矿矿床:一个大型新类型钛矿床的发现、勘查和研究[J]. 地质学报, 2012, 86(9):1350-1366. Zhao Y M, Li D X, Wu L S, et al. Moshishan metamorphosed sedimentary anatase deposit:Discovery, exploration, and study of a new genetic type large titanium deposit[J]. Acta Geologica Sinica, 2012, 86(9):1350-1366.
[18]
杨合群, 苏犁, 宋述光, 等. 论陕西毕机沟钒钛磁铁矿床成因[J]. 地质与勘探, 2013, 49(6):1036-1045. Yang H Q, Su L, Song S G, et al. On genesis of the Bijigou V-Ti magnetite deposit in Shaanxi Province[J]. Geology and Exploration, 2013, 49(6):1036-1045.
[19]
李洪奎, 于学峰, 杨永波. 山东莒县棋山钛铁矿地质特征及成因探讨[J]. 地质学报, 2010, 84(7):1041-1048. Li H K, Yu X F, Yang Y B. Geological characteristics and origin of the Qishan ilmenite deposit in Shandong Province[J]. Acta Geologica Sinica, 2010, 84(7):1041-1048.
[20]
邢长明, 王焰, 张传林. 塔里木大火成岩省皮羌层状岩体的矿物结晶顺序和钒钛磁铁矿矿石成因探讨[J]. 地学前缘, 2013, 20(4):285-298. Xing C M, Wang Y, Zhang C L. Crystallization sequence and origin of the Fe-Ti-V oxide ores from the Piqiang layered intrusion in the Tarim large igneous province, NW China[J]. Earth Science Frontiers, 2013, 20(4):285-298.
[21]
翟裕生, 姚书振, 蔡克勤. 矿床学[M]. 3版. 北京:地质出版社, 2011:329-330. Zhai Y S, Yao S Z, Cai K Q. Mineral deposits[M]. 3rd ed. Beijing:Geological Publishing House, 2011:329-330.