甘肃北山红柳沟辉长岩地球化学、年代学及构造意义
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摘要
甘肃北山红柳沟辉长岩LA-ICP-MS锆石U-Pb年龄为405.8±2.9 Ma;辉长岩w(SiO_2)、w(Fe)变化范围大,w(K_2O)、w(Na_2O)低且相对富钠贫钾,辉长岩具有Eu、Sr的正异常,富集大离子亲石元素(Rb、Sr、Ba等)和轻稀土元素,强烈亏损高场强元素(Nb、Th、Ce等)和重稀土元素.结合区域大地构造背景,认为红柳沟辉长岩是先前俯冲流体交代过的亏损地幔部分熔融形成的玄武质岩浆分异堆积的产物,形成于早泥盆世后碰撞伸展的陆缘环境,指示在早泥盆世北山南部地区由挤压向伸展拉张的构造体制转换.
The LA-ICP-MS zircon U-Pb dating showed that Hongliugou gabbro formed around 405.8±2.9 Ma. The gabbro is characterized by its variable w(SiO_2), w(Fe), low alkali content and sodium-rich. The LREE and LILE such as Rb, Sr and Ba are enriched, while the HREE and HFSE such as Nb, Th and Ce are depleted; the rocks also exhibit positive Eu and Sr anomalies. Combined with regional tectonic setting, the studied results indicated that the parental magma of gabbro derived probably from the depleted mantle metasomatized previously by a subduction fluid and accumulated to form the gabbro in the active continental margin in the post-collisional extensional tectonic setting in early Devonian. All results implied that Beishan area, during the tectonic period, changed from compression to extension in early Devonian.
The LA-ICP-MS zircon U-Pb dating showed that Hongliugou gabbro formed around 405.8±2.9 Ma. The gabbro is characterized by its variable w(SiO_2), w(Fe), low alkali content and sodium-rich. The LREE and LILE such as Rb, Sr and Ba are enriched, while the HREE and HFSE such as Nb, Th and Ce are depleted; the rocks also exhibit positive Eu and Sr anomalies. Combined with regional tectonic setting, the studied results indicated that the parental magma of gabbro derived probably from the depleted mantle metasomatized previously by a subduction fluid and accumulated to form the gabbro in the active continental margin in the post-collisional extensional tectonic setting in early Devonian. All results implied that Beishan area, during the tectonic period, changed from compression to extension in early Devonian.
引文
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[2]Mao Qi-gui,Xiao Wen-jiao,Windley B,et al.The Liuyuan complex in the Beishan,NW China:a Carboniferous-Permian ophiolitic fore-arc sliver in the southern Altaids[J].Geological Magazine,2012,149(149):483-506.
[3]何彦彬,王金荣,侯克选,等.新疆西准噶尔库鲁木苏石英闪长岩成因及地质意义[J].兰州大学学报:自然科学版,2015,51(3):303-312.
[4]杨经绥,许志琴,马昌前,等.复合造山作用和中国中央造山带的科学问题[J].中国地质,2010,37(1):1-11.
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[7]范育新,白云来,陈发虎.北山地区辉长岩类的地球化学特征及其深部信息[J].地球学报,2005,26(B09):61-66.
[8]Su Ben-xun,Qin Ke-zhang,Santosh M,et al.The early Permian mafic-ultramafic complexes in the Beishan Terrane,NW China:Alaskan-type intrusives or rift cumulates?[J].Journal of Asian Earth Sciences,2013,66:175-187.
[9]Xie Xie,Yang Jian-guo,Wang Xiao-hong,et al.Zircon SHRIMP U-Pb dating of Hongliugou mafic-ultramafic complex in the Beishan area of Gansu Province and its geological significance[J].Geology in China,2015,31(2):448-454.
[10]杨建国,王磊,谢燮,等.甘肃北山怪石山铜镍矿化基性-超基性杂岩体锆石SHRIMP U-Pb同位素定年及其意义[J].大地构造与成矿学,2016,40(1):98-108.
[11]谢燮,杨建国,王小红,等.甘肃北山红柳沟铜镍矿化基性-超基性岩体SHRIMP锆石U-Pb年龄及其地质意义[J].中国地质,2015,42(2):396-405.
[12]Xiao Wen-jiao,Huang Bao-chun,Han Chun-ming,et al.A review of the western part of the Altaids:a key to understanding the architecture of accretionary orogens[J].Gondwana Research,2010,18(2/3):253-273.
[13]何世平,周会武,任秉琛,等.甘肃内蒙古北山地区古生代地壳演化[J].西北地质,2005,38(3):6-15.
[14]左国朝,何国琦.北山板块构造及成矿规律[M].北京:北京大学出版社,1990.
[15]左国朝,刘义科,刘春燕.甘新蒙北山地区构造格局及演化[J].甘肃地质学报,2003,12(1):1-15.
[16]郭召杰,史宏宇,张志诚,等.新疆甘肃交界红柳河蛇绿岩中伸展构造与古洋盆演化过程[J].岩石学报,2006,22(1):95-102.
[17]杨建国,谢春林,王小红,等.甘肃北山地区基本构造格局和成矿系列特征[J].地质通报,2012,31(2/3):422-438.
[18]杨合群,李英,赵国斌,等.北山蛇绿岩特征及构造属性[J].西北地质,2010,43(1):26-36.
[19]郑荣国,吴泰然,张文,等.北山地区月牙山-洗肠井蛇绿岩的地球化学特征及形成环境[J].地质学报,2012,86(6):960-971.
[20]苏本勋,秦克章,孙赫,等.新疆北山地区红石山镁铁-超镁铁岩体的岩石矿物学特征:对同化混染和结晶分异过程的启示[J].岩石学报,2009,25(6):873-887.
[21]刘博,戴霜,张翔,等.南祁连党河南山地区加里东期碰撞后的地壳伸展:来自煌斑岩的证据[J].兰州大学学报:自然科学版,2016,52(2):153-160.
[22]王小红,杨建国,王磊,等.甘肃北山大山头铜镍矿化基性-超基性岩成矿潜力研究[J].高校地质学报,2014,20(2):222-229.
[23]谢燮,杨建国,王小红,等.甘肃北山大山头一带铜镍矿化基性-超基性岩地质、地球化学特征及成矿潜力[J].新疆地质,2013,31(4):353-359.
[24]刘东晓,王玉玺,王金荣,等.塔里木板块东南缘早二叠世角闪石岩的发现及大地构造意义[J].兰州大学学报:自然科学版,2016,52(2):167-178.
[25]Yuan Hong-lin,Gao Shan,Liu Xiao-ming,et al.Accurate U-Pb age and trace element determinations of zircon by laser Ablation-inductively coupled plasma-mass spectrometry[J].Geostandards and Geoanalytical Research,2004,28(3):353-370.
[26]Liu Yong-sheng,Gao Shan,Hu Zhao-chu,et al.Continental and oceanic crust recycling-induced melt peridotite interactions in the trans-north china orogen:U-Pb dating,Hf isotopes and trace elements in zircons from mantle xenoliths[J].Journal of Petrology,2010,51(1/2):392-399.
[27]Pidgeon R T,Nemchin A A,Hitchen G J.Internet structures of zircons from the darling range batholith:implications for zircon stability and the interpretation of zircon U-Pb ages[J].Contributions to Mineralogy and Petrology,1998,132:288-299.
[28]吴利仁.论中国基性岩、超基性岩的成矿专属性[J].地质科学,1963,4(1):29-41.
[29]Middlemost E A K.Naming materials in the magma/igneous rock system[J].Earth Science Reviews,1994,37(3/4):215-224.
[30]Maitre R W.A classification of igneous rocks and glossary of terms:recommendations of the international union of geological sciences subcommission on the systematics of igneous rocks[M].New York:Blackwell,1989.
[31]Sun S S,McDonough W F.Chemical and isotopicsystematics of oceanic basalts:implications foe mantle composition and processes[J].Geological Society,1989,42:313-345.
[32]Hess P C.Origins of igneous rocks[M].Cambirge:Harvard University Press,1989.
[33]Stolz A J,Jochum K P,Spettel B,et al.Fluid and meltrelated enrichment in the subarc mantle:evidence from Nb/Ta variat ions in island-arc basalts[J].Geology,1996,24(7):587-590.
[34]Niu Yao-lin,Zhao Zhi-dan,Zhu Di-cheng,et al.Continental collision zones are primary sites for net continental crust growth:a testable hypothesis[J].Earth Science Reviews,2013,127:96-110.
[35]Breitkopf J.Geochemical evidence for magma source heterogeneing and activity of a mantle plume during advanced rifting in the Southern Damara orogen,Nambia[J].Lithos,1989,23(1):115-122.
[36]龚全胜,刘明强,梁明宏,等.北山造山带大地构造相及构造演化[J].西北地质,2003,36(1):11-17.
[37]贺振宇,宗克清,姜洪颖,等.北山造山带南部早古生代构造演化:来自花岗岩的约束[J].岩石学报,2014,30(8):2324-2338.
[38]Mao Jian-ren,Pirajno F,Zhang Zuo-heng et al.A review of the Cu-Ni sulphide deposits in the Chinese Tianshan and Altay orogens(Xinjiang Autonomous Region,NW China):principal characteristics and ore-forming processes[J].Journal of Asian Earth Sciences,2008,32(2/4):184-203.
[39]Mao Qi-gui,Xiao Wen-jiao,Fang Tong-hui,et al.Late Ordovician to early Devonian adakites and Nb-enriched basalts in the Liuyuan area,Beishan,NW China:implications for early Paleozoic slab-melting and crustal growth in the southern Altaids[J].Gondwana Research,2012,22(2):534-553.
[40]郑荣国,吴泰然,张文,等.甘肃北山中带早泥盆世的构造-岩浆作用:来自公婆泉花岗岩体年代学和地球化学证据[J].北京大学学报:自然科学版,2012,48(4):603-616.
[41]李舢,王涛,童英,等.北山辉铜山泥盆纪钾长花岗岩锆石U-Pb年龄、成因及构造意义[J].岩石学报,2011,27(10):3055-3070.
[42]颉炜,宋谢炎,邓宇峰,等.甘肃黑山含铜镍硫化物岩体岩浆源区特征及构造背景探讨[J].矿物学报,2011(S1):351-352.