华北板块西南缘河西堡中酸性侵入岩岩石地球化学和环境演化特征
Geochemical and Environmental Characteristics of Hexipu Medium-acid Intrusive Rocks in the Southern Margin of North China Plate
-
摘要: 河西堡中酸性侵入岩体位于华北板块西南缘龙首山和祁连山造山带的结合部，岩性为细粒石英闪长岩、中细粒花岗闪长岩、中粗粒似斑状花岗闪长岩、中粗粒似斑状二长花岗岩，均具有富钾、硅，贫铝、钙、镁和负Eu异常，富含稀土铀、钍矿物等特点。稀土元素配分模式呈轻稀土富集型；地球化学特征显示SiO2、ΣREE、ΣLREE/ΣHREE、La/Yb逐渐增高和δEu增大的演化趋势，87Sr/ 86Sr的变化范围为0.706 0~0.707 8，岩体由早期的I型逐渐过渡为I-S到S型，反映构造环境由块体挤压至碰撞造山的过程。结合区域资料，认为加里东早期北祁连向华北板块俯冲形成沟弧体系，在挤压作用下导致北祁连走廊过渡带与龙首山在加里东中期碰撞造山，碰撞造山作用于加里东晚期终止，较为系统的反映了龙首山造山带的构造演化过程。Abstract: The Hexipu medium-acid intrusive rock is located at the intersection area between the Qilian orogenic belt and the Longshou mountain of the southwestern margin of North China Carton, which is composed of fine grained quartz diorite, medium-fine grained granodiorite, medium-coarse grained porphyritic granodiorite and medium-coarse grained porphyritic monzogranite. The Hexipao granitic plutons are enriched in K and Si, but depleted in Al, Ca and Mg, having weakly negative Eu anomalies. Chondrite-normalized REE patterns show that all samples are enriched in LREEs. The δEu values of the ploutons are rising with the increasing of the SiO2, ΣREE, ΣLREE/ΣHREE and La/Yb. The 87Sr/86Sr ratios of all samples vary from 0.706 0 to 0.707 8, these plutons have been transited from early I type to I-S type to S type, showing a complete process of transiting from plate compression to collisional orogeny. Combined with the regional geological data, the results show that the North Qilian was subducted into the North China craton in Early Caledonian to form a trench-arc-basin system, the compression was led to the mid-Caledonian collisional orogeny between the North Qilian and Longshou mountain, and this collisional stage was terminated in Late Caledonian, systematically reflecting the tectonic evolution of the Longshoushan orogenic belt.
-
Key words:
- medium-acid intrusive rock /
- Hexipu /
- back-arc spreading /
- collisional orogeny
-
-
张新虎. 龙首山裂谷带的基本特征及演化历史[J]. 西北地质, 1992,13(1):6-13.
ZHANG Xinhu. The basic characteristics and evolution history of the Longshoushan rift belt[J]. Northwestern Geology, 1992, 13(1):6-13.
李文渊. 中国西北部成矿地质特征及找矿新发现[J].中国地质,2015,42(3):365-380.
LI Wenyuan. Metallogenic geological characteristics and newly discovered orebodies in Northwest China[J]. Geology in China, 2015, 42(3):365-380.
安国堡, 辛存林, 杨涛, 等.甘肃龙首山成矿带地质构造演化及其对铀矿成矿的控制作用[J].地球科学与环境学报, 2016, 38(6):803-812.
AN Guobao, XIN Cunlin, YANG Tao, et al. Geotectonic evolution of Longshoushan metallogenic belt in Gansu and its control function on uranium mineralization[J]. Journal of Earth Science and Environment, 2016, 38(6):803-812.
马章海, 李继刚.龙首山铀矿带207矿床初步勘探总结报告[R].武威:核工业部西北地质勘查局二一二大队, 1986.
李献华, 苏犁, 宋彪, 等. 金川超镁铁侵入岩SHRIMP锆石U-Pb年龄及地质意义[J].科学通报, 2004, 49(4):401-402.
LI Xianhua, SU Li, SONG Biao, et al. SHRIMP U-Pb age of zircon and geological significance of Jinchuan ultrafine[J].Science Bulletin, 2004, 49(4):401-402.
李文渊, 汤中立, 张照伟, 等. 对小岩体成矿的认识及其找矿意义[J].西北地质, 2012, 45(4):61-68.
LI Wenyuan, TANG Zhongli, ZHANG Zhaowei, et al. The concept of mineralization of the small rock mass and prospecting significance[J]. Northwestern Geology, 2012, 45(4):61-68.
赵亚云, 张树明, 汤琳, 等. 龙首山中段加里东期花岗岩浆作用与铀成矿作用研究述评[J].甘肃地质, 2015,24(2):71-78.
ZHAO Yayun, ZHANG Shuming, TANG Lin, et al. Caledonian granitic magmatism and uranium mineralization in middle Longshoushan[J]. Gansu Geology, 2015,24(2):71-78.
方同辉,王崇礼,王珰荣. 河西堡花岗岩体中闪长质包体与岩浆混合作用[J]. 西安地质学院学报,1997, 19(4):53-61.
FANG Tonghui, WANG Chongli, WANG Dangrong. Dioritic enclaves and magma mingling in Hexibao granite[J]. Journal of Xian College of Geology,1997, 19(4):53-61.
魏俏巧,郝立波,陆继龙,等.甘肃河西堡花岗岩LA-MC-ICP-MS锆石U-Pb年龄及其地质意义[J].矿物岩石地球化学通报, 2013, 32(6):729-735.
WEI Qiaoqiao, HAO Libo, LU Jilong, et al. LA-MC-ICP-MS zircon U-Pb dating of Hexipu granite and its geological implications[J]. Bulletin of Mineralogy, Petrology and Geochemistry, 2013, 32(6):729-735.
汤中立, 李文渊. 金川硫化铜镍(含铂)矿床成矿模式及地质对比[D]. 甘肃地矿局, 金川有色金属公司,1993.
TANG Zhongli, LI Wenyuan. Metallogenic model and geological comparison of gold and copper nickel sulfide (platinum) deposit[D]. Gansu Provincial Bureau of Geology and Mineral Exploration & Development, Jinchuan nonferrous metals company, 1993.
朱士兴, 程裕琪, 张鹏远, 等. 华北地台中、上元古界生物地层序列[M]. 北京:地质出版社, 1994.
ZHU Shixing, CHENG Yuqi, ZHANG Pengyuan, et al. The sepuence of biostratigraphy in the Mesozoic and upper Paleozoic strata in North China[M]. Beijing:Geological Publishing House, 1994.
张本期, 张翔. 西坡幅、河西堡幅、东寨幅1:5万区域地质调查报告[R]. 甘肃省地矿局第二地质勘查院, 2005.
李文渊. 龙首山震旦纪砾状白云岩成因探讨[J]. 甘肃地质, 1991, 12(2):81-88.
LI Wenyuan. Preliminary study on the origin of the carbonate fragmental flow sedimentary of the simian period in Longshou mountain[J].Gansu Geology,1991, 12(2):81-88.
校培喜, 由伟丰, 曹宣铎, 等. 甘肃中西部龙首山一带"韩母山群"的重新厘定[J]. 地质通报, 2011, 30(8):1228-1232.
XIAO Peixi, YOU Weifeng, CAO Xuanduo, et al. Redefining of the Hanmushan Group in Longshoushan, central-western Gansu Province[J]. Geological Bulletin of China, 2011, 30(8):1228-1232.
左国朝, 刘寄陈. 北祁连早古生代大地构造演化[J]. 地质科学, 1987, (1):14-24.
ZUO Guochao, LIU Jichen. The evolution of tectonic of early Paleozoic in north Qilian range, China[J]. Scientia Geologica Sinica, 1987, (1):14-24.
邢凤鸣. 锶同位素初始比值在划分花岗岩成因类型上的应用探讨[J]. 岩石学报, 1987, (2):75-78.
XING Fengming. On the application of initial strontium isotope ratios in division of granite genetic types[J].Acta Petrologica Sinica, 1987, (2):75-78.
冯益民, 吴汉泉.北祁连山及其邻区古生代以来的大地构造演化初探[J]. 西北地质科学, 1992, 13(2):61-71.
FENG Yimin, WU Hanquan. Tectonic evolution of north Qilian mountains and its Neighborhood since Paleozoic[J]. Northwest Geoscence, 1992, 13(2):61-71.
许志琴, 徐惠芬, 张建新, 等. 北祁连走廊南山加里东俯冲杂岩增生地体及其动力学[J]. 地质学报, 1994, 68(1):1-15.
XU Zhiqin, XU Huifen, ZHANG Jianxin, et al. The Zhoulangnanshan Caledonian subductive complex in the northern Qilian mountains and its dynamics[J]. Acta Geologica Sinica, 1994, 68(1):1-15.
夏林圻, 夏祖春, 徐学义. 北祁连山奥陶纪弧后盆地火山岩浆成因[J].中国地质, 2003, 30(1):48-60.
XIA Linqi, XIA Zuchun, XU Xueyi. Magmagenesis of Ordovician back-arc basins in the Northern Qilian mountains[J]. Geology in China, 2003, 30(1):48-60.
周立发.阿拉善地块南缘早古生代大地构造特征和演化[J]. 西北大学学报, 1992, 22(1):107-115.
ZHOU Lifa. Early Paleozoic tectonic features and evolutions in the Southern margin of Alaxa massif[J].Journal of Northwest University(Natural Science Edition), 1992, 22(1):107-115.
PEARCE J A, HARRIS N B W, TINDLE A G. Trace element discrimination diagrams for the tectonic interpretation of granitic rocks[J]. Journal of Petrology, 1984, 25(4):956-983.
SUN S S, MCDONOUGH W F. Chemical and isotopic systematic of oceanic basalts:Implications for mantle composition and processes[J]. Geological Society London Special Publications, 1989, 42(1):313-345.
PUPIN J P. Zircon and granite petrology[J]. Contributions to Mineralogy and Petrology, 1980, 73(3):207-220.
HARRIS N B W, PEARCE J A, TINDLE A G. Geochemical characteristics of collision-zone magmatism. In:Coward M P, Ries A C (eds) Collision Tectonics[J]. Geological Society London Special Publication, 1986, 19, 67-81.
BATCHELOR R. A., BOWDEN P. Petrogenetic interpretation of granitic rock series using multicationic parameters[J]. Chemical Geology, 1985, 48, 43-55.
-
计量
- 文章访问数: 2253
- PDF下载数: 1943
- 施引文献: 0
下载: