祁连山西段当金山一带原巴龙贡噶儿组的重新厘定及其构造意义
|
摘要
巴龙贡噶尔组是广泛分布于南祁连地区的古生代地层,通过区域地层对比研究,将祁连山西段当金山一带原巴龙贡噶尔组中的变质岩系厘定命名为拐杖山岩群(Pt_(2-3)G.),LA-ICP-MS锆石U-Pb年龄显示该地层形成于1662.8±5.7~962.9±4.4Ma的中新元古代。区域构造分析认为,南祁连地区前寒武纪变质基底岩石很可能是古老的柴达木地块的基底组分,是南祁连向南逆冲推覆于柴达木地块上的大型构造窗。
Balonggongge'er Formation is a Paleozoic stratigraphic unit distributed in southern Qilian Mountain. The authors disintegrated a typical schist unit in Balonggongge'er Formation which is located in West Qilian Mountain and named Guaizhangshan Complex-Group. LA-ICP-MS zircon U-Pb geochronology reveals 3 age spans, i.e., 2540±5 Ma, 1662.8±5.7 Ma and 962.9±4.4 Ma respectively. Regional structural analysis shows that the Precambrian metamorphic basement rocks in southern Qilian Mountain was probably the basal components of ancient Qaidam massif, and was the tectonic window of Qaidam massif which was thrust southward and lay over southern Qilian Mountain through napping.
Balonggongge'er Formation is a Paleozoic stratigraphic unit distributed in southern Qilian Mountain. The authors disintegrated a typical schist unit in Balonggongge'er Formation which is located in West Qilian Mountain and named Guaizhangshan Complex-Group. LA-ICP-MS zircon U-Pb geochronology reveals 3 age spans, i.e., 2540±5 Ma, 1662.8±5.7 Ma and 962.9±4.4 Ma respectively. Regional structural analysis shows that the Precambrian metamorphic basement rocks in southern Qilian Mountain was probably the basal components of ancient Qaidam massif, and was the tectonic window of Qaidam massif which was thrust southward and lay over southern Qilian Mountain through napping.
引文
[1]甘肃省地质矿产局.甘肃省岩石地层[M].武汉:中国地质大学出版社, 1997:79-81.
[2]罗明非.甘肃党河南山早古生代大地构造性质研究[D].成都理工大学硕士学位论文, 2010.
[3]刘虎.甘肃省阿克塞县向阳煤矿一带发现奥陶系火玄武岩的地质特征及其锆石U-Pb年龄山岩组合[J].甘肃地质, 2014, 23(4):92-93.
[4]王国华,齐瑞荣,贾祥祥,等.青海南祁连哈尔达乌片岩的构造特征及时代讨论[J].甘肃地质, 2016, 25(3):48-52.
[5]牛广智,黄岗,邓昌生,等.青海南祁连巴龙贡噶尔组变火山岩LA-ICP-MS锆石U-Pb年龄及其地质意义[J].地质通报, 2016,35(9):1441-1447.
[6]许志琴,杨经绥,姜枚.青藏高原北部的碰撞造山及深部动力学[J].地球学报, 2001, 22(1):5-10.
[7]王永和,校培喜,张汉文,等.苏吾什杰幅地质调查新成果及主要进展[J].地质通报, 2004, 2(5/6):560-563.
[8]潘桂棠,李兴振,王立全,等.青藏高原及邻区大地构造单元初步划分[J].地质通报, 2002, 21(1):701-707.
[9]夏林圻,李向民,余吉远,等.祁连山新元古代中—晚期至早古生代火山作用与构造演化[J].中国地质, 2016, 43(4):1087-1138.
[10]王毅智,拜永山.青海天峻南山蛇绿岩的细致特征及其形成环境[J].青海地质, 2001,(1):29-35.
[11]黄增保,郑建平,李葆华,等.南祁连大道尔吉早古生代弧后盆地型蛇绿岩的年代学、地球化学特征及意义[J].大地构造与成矿学, 2016, 40(4):826-838.
[12]修群业,于海峰,刘永顺,等.阿尔金北缘枕状玄武岩的地质特征及其锆石U-Pb年龄[J].地质学报, 2007, 81(6):787-794.
[13]李向民,马中平,孙吉明,等.阿尔金断裂南缘约马克其镁铁-超镁铁岩的性质和年代学研究[J].岩石学报, 2009, 25(4):862-872.
[14]王焰,刘良,车自成,等.阿尔金茫崖地区早古生代蛇绿岩的地球化学特征[J].地质评论, 1999, 45(增刊):1010-1014.
[15]杨经绥,吴才来,史仁灯.阿尔金山米兰红柳沟的席状岩墙群:海底扩张的重要证据[J].地质通报, 2002, 21(2):69-74.
[16]张国英,丁书宏.南祁连西段清水沟南巴龙贡噶尔组地层特征及时代讨论[J].甘肃地质学报, 2004, 13(1):38-45.
[17]Tarney J. Geochemistry of Archaean high-grade gneisses, with implications as to the origin and evolution of the Precambrian crust[C]//The early history of the earth. New York:Wiley, 1976:405-418.
[18]Roser B P, Korsch R J. Determination of tectonic setting of sandstone-mudstone studies using SiO2content and K2O/Na2O ratio[J]. J. Geol., 1986, 94:635-650.
[19]Winchester J A, Floyd P A. Geochemical discrimination of different magma series and their differentiation products using immobile elements[J]. Chem. Geol., 1977, 20:325-343.
[20]Petijohn F J, Potter P E, Siever R. Sand and sandstones[M].NewYork:Springer-Verlag, 1972.
[21]赵生贵.祁连造山带特征及其构造演化[J].甘肃地质学报, 1996,5(1):16-29.
[22]王亮.柴达木盆地新生代不整合的发现对阿尔金断裂研究的启示[D].浙江大学博士学位论文, 2009.
[23]周炎如,李相博,袁剑英.祁连-柴达木构造域盆地-造山带耦合的构造体系[J].新疆石油地质, 2000, 21(5):387-390
①甘肃省地质局.当金山口幅1∶200000区域地质调查报告(地质部分).中华人民共和国区域地质调查报告, 1977.
[2]罗明非.甘肃党河南山早古生代大地构造性质研究[D].成都理工大学硕士学位论文, 2010.
[3]刘虎.甘肃省阿克塞县向阳煤矿一带发现奥陶系火玄武岩的地质特征及其锆石U-Pb年龄山岩组合[J].甘肃地质, 2014, 23(4):92-93.
[4]王国华,齐瑞荣,贾祥祥,等.青海南祁连哈尔达乌片岩的构造特征及时代讨论[J].甘肃地质, 2016, 25(3):48-52.
[5]牛广智,黄岗,邓昌生,等.青海南祁连巴龙贡噶尔组变火山岩LA-ICP-MS锆石U-Pb年龄及其地质意义[J].地质通报, 2016,35(9):1441-1447.
[6]许志琴,杨经绥,姜枚.青藏高原北部的碰撞造山及深部动力学[J].地球学报, 2001, 22(1):5-10.
[7]王永和,校培喜,张汉文,等.苏吾什杰幅地质调查新成果及主要进展[J].地质通报, 2004, 2(5/6):560-563.
[8]潘桂棠,李兴振,王立全,等.青藏高原及邻区大地构造单元初步划分[J].地质通报, 2002, 21(1):701-707.
[9]夏林圻,李向民,余吉远,等.祁连山新元古代中—晚期至早古生代火山作用与构造演化[J].中国地质, 2016, 43(4):1087-1138.
[10]王毅智,拜永山.青海天峻南山蛇绿岩的细致特征及其形成环境[J].青海地质, 2001,(1):29-35.
[11]黄增保,郑建平,李葆华,等.南祁连大道尔吉早古生代弧后盆地型蛇绿岩的年代学、地球化学特征及意义[J].大地构造与成矿学, 2016, 40(4):826-838.
[12]修群业,于海峰,刘永顺,等.阿尔金北缘枕状玄武岩的地质特征及其锆石U-Pb年龄[J].地质学报, 2007, 81(6):787-794.
[13]李向民,马中平,孙吉明,等.阿尔金断裂南缘约马克其镁铁-超镁铁岩的性质和年代学研究[J].岩石学报, 2009, 25(4):862-872.
[14]王焰,刘良,车自成,等.阿尔金茫崖地区早古生代蛇绿岩的地球化学特征[J].地质评论, 1999, 45(增刊):1010-1014.
[15]杨经绥,吴才来,史仁灯.阿尔金山米兰红柳沟的席状岩墙群:海底扩张的重要证据[J].地质通报, 2002, 21(2):69-74.
[16]张国英,丁书宏.南祁连西段清水沟南巴龙贡噶尔组地层特征及时代讨论[J].甘肃地质学报, 2004, 13(1):38-45.
[17]Tarney J. Geochemistry of Archaean high-grade gneisses, with implications as to the origin and evolution of the Precambrian crust[C]//The early history of the earth. New York:Wiley, 1976:405-418.
[18]Roser B P, Korsch R J. Determination of tectonic setting of sandstone-mudstone studies using SiO2content and K2O/Na2O ratio[J]. J. Geol., 1986, 94:635-650.
[19]Winchester J A, Floyd P A. Geochemical discrimination of different magma series and their differentiation products using immobile elements[J]. Chem. Geol., 1977, 20:325-343.
[20]Petijohn F J, Potter P E, Siever R. Sand and sandstones[M].NewYork:Springer-Verlag, 1972.
[21]赵生贵.祁连造山带特征及其构造演化[J].甘肃地质学报, 1996,5(1):16-29.
[22]王亮.柴达木盆地新生代不整合的发现对阿尔金断裂研究的启示[D].浙江大学博士学位论文, 2009.
[23]周炎如,李相博,袁剑英.祁连-柴达木构造域盆地-造山带耦合的构造体系[J].新疆石油地质, 2000, 21(5):387-390
①甘肃省地质局.当金山口幅1∶200000区域地质调查报告(地质部分).中华人民共和国区域地质调查报告, 1977.