Abstract：Silurian outcrops include Llandovery Series and Wenlock Series in Zhangjiajie area. In the mudstones of Llandovery Series, the contents of different compositions are as follows: the average content of SiO2 is 61.59%, the average value of SiO2/Al2O3 is 3.63, K2O/ Na2O is 4.80, Al2O3/(K2O+Na2O) is 3.49, the average content of ∑REE is 238.58×10-6,the average content of LREE is 213.89×10-6, the average value of LREE/HREE is 8.68, the average content of B is 98.29×10-6,the average value of B/Ga is 3.99 and the average value of Th/U is 5.61. According to the tectonic setting discrimination diagrams,the authors declared that the mudstones source of Llandovery Series is active continental margin, interfused with some continent island arc. And the older source could be passive continental margin. The authors concluded that after the combination of Cathaysia and Yangtze Plate, the new plate continued to extrude northwest and formed many uplifts (Qianzhong and Xuefeng uplifts). With further extrusion, Xuefeng uplift was raised above the sea level, which provided argillaceous sediment for Zhangjiajie area. The extrusion caused the formation of island arc and provided part source.
[1] McLennan S M,Hemming S,McDaniel M J,et al.Geochemical approaches to sedimentation,provenance and tectonics[M]//Jonhanson M J.Processes Controlling the Composition of Clastic Sediments.Boulder:Geological Society of America,1993:21-40. [2] 毛光周,刘池洋.地球化学在物源及沉积背景分析中的应用[J].地球科学与环境学报,2011,33(4):337-348. [3] 赵振华.微量元素地球化学原理[M].2版.北京:科学出版社,2016:285-289. [4] 于兴河,王德发,郑浚茂.华北地区二叠系砂岩成分与构造背景关系的探讨[J].现代地质,1994,8(3):299-307. [5] 顾雪祥,刘建明,Schulz O,等.江南造山带雪峰隆起区元古宙浊积岩沉积构造背景的地球化学制约[J].地球化学,2003,32(5):406-426. [6] 和政军,李锦轶,莫申国,等.漠河前陆盆地砂岩岩石地球化学的构造背景和物源区分析[J].中国科学:地球科学,2003,33(12):1219-1226. [7] 赵小明,姚华舟,汤朝阳,等.青海省曲麻莱地区上三叠统巴颜喀拉山群砂岩成分与构造背景探讨[J].华南地质与矿产,2006(1):54-58. [8] 柏道远,周亮,王先辉,等.湘东南南华系—寒武系砂岩地球化学特征及对华南新元古代—早古生代构造背景的制约[J].地质学报,2007,81(6):755-771. [9] 赵振华.关于岩石微量元素构造环境判别图解使用的有关问题[J].大地构造与成矿学,2007,31(1):92-103. [10] 李双建,肖开华,沃玉进,等.湘西、黔北地区志留系稀土元素地球化学特征及其地质意义[J].现代地质,2008,22(2):273-280. [11] 朱志军,陈洪德,林良彪,等.川东南—湘西地区志留系小河坝组砂岩微量元素地球化学特征及意义[J].地质科技情报,2010,29(2):24-30,43. [12] 孙林华,桂和荣.皖北地区新元古代构造背景的转换:来自碎屑岩地球化学的证据[J].地球学报,2011,32(5):523-532. [13] 王浩霖,常山.贺兰山中段奥陶系米钵山组砂岩地球化学及构造背景分析[J].资源调查与环境,2012,33(3):198-205. [14] 胡楠,裴先治,李瑞保,等.东昆仑南缘布青山得力斯坦地区马尔争组物源分析及其构造背景研究[J].地质学报,2013,87(11):1731-1747. [15] 梁恩云,彭能立,刘耀荣,等.张家界三岔地区五强溪组岩石地球化学与构造背景探讨[J].东华理工大学学报:自然科学版,2016,39(3):259-265. [16] 文玲,胡书毅,田海芹.扬子地区志留纪岩相古地理与石油地质条件研究[J].石油勘探与开发,2002,29(6):11-14. [17] 苏文博,李志明,史晓颖,等.华南五峰组—龙马溪组与华北下马岭组的钾质斑脱岩及黑色岩系——两个地史转折期板块构造运动的沉积响应[J].地学前缘,2006,13(6):82-95. [18] 胡艳华,孙卫东,丁兴,等.奥陶纪—志留纪边界附近火山活动记录:来华南周缘钾质斑脱岩的信息[J].岩石学报,2009,25(12):3298-3308. [19] 董大忠,程克明,王玉满,等.中国上扬子区下古生界页岩气形成条件及特征[J].石油与天然气地质,2010,31(3):288-299,308. [20] 王玉满,董大忠,李建忠.川南下志留统龙马溪组页岩气储层特征[J].石油学报,2012,33(4):551-561. [21] 郑和荣,高波,彭勇民,等.中上扬子地区下志留统沉积演化与页岩气勘探方向[J].古地理学报,2013,15(5):645-656. [22] 于深洋,李越,张园园.云南大关志留系龙马溪组灰岩层显示的台缘相特征[J].地层学杂志,2016,40(2):162-167. [23] 王根贤,耿良玉,肖耀海,等.湘西北秀山组上段、小溪峪组的地质时代和沉积特征[J].地层学杂志,1988,12(3):216-227. [24] 万方,许效松.川滇黔桂地区志留纪构造-岩相古地理[J].古地理学报,2003,5(2):180-186. [25] 王怿,戎嘉余,徐洪河,等.湖南张家界地区志留纪晚期地层新见兼论小溪组的时代[J].地层学杂志,2010,34(2):113-126. [26] 李斌,胡博文,石小虎,等.湘西地区志留纪沉积体系及典型前陆盆地的形成模式研究[J].地学前缘,2015,22(6):167-176. [27] Cullers R L,Podkovyrov V N.The source and origin of terrigenous sedimentary rocks in the Mesoproterozoic Ui group,southeastern Russia[J].Precambrian Res,2002,117(3/4):157-183. [28] Nesbitt H W,Young G M.Early Proterozoic climates and plate motions inferred from major element chemistry of lutites[J].Nature,1982,299:715-717. [29] 迟清华,鄢明才.应用地球化学元素丰度数据手册[M].北京:地质出版社,2007:48-49. [30] Taylor S R,McLennan S M.The continental crust: its composition and evolution.An examination of the geochemical record preserved in sedimentary rocks[M].Oxford,London:Blackwell scientific Publication,1985:1-301. [31] 刘英俊,曹立明,李兆麟,等.元素地球化学[M].北京:科学出版社,1984:360-428. [32] Bhatia M R.Plate tectonics and geochemical composition of sandstones[J].J Geol,1983,91(6):611-627. [33] Roser B P,Korsch R J.Determination of tectonic setting of sandstone-mudstone suites using SiO 2 content and K 2 O/Na 2 O ratio[J].J Geol,1986,94(5):635-650. [34] Pearce J A.Role of the sub-continental lithosphere in magma genesis at active continental margins[M]//Hawkesworth C J,Norry M J.Continental Basalts and Mantle Xenoliths.Shiva:Nantwich,1983:230-249. [35] Bhatia M R.Rare earth element geochemistry of Australian Paleozoic graywackes and mudrocks:Provenance and tectonic control[J]Sediment Geol,1985,45(1/2):97-113. [36] Bhatia M R,Crook K A W.Trace element characteristics of graywackes and tectonic setting discrimination of sedimentary basins[J].Contrib Mineral Petrol,1986,92(2):181-193. [37] 戎嘉余,詹仁斌,许红根,等.华夏古陆于奥陶—志留纪之交的扩展证据和机制探索[J].中国科学:地球科学,2010,40(1):1-17. [38] 戎嘉余,王怿,詹仁斌,等.论桐梓上升——志留纪埃隆晚期黔中古陆北扩的证据[J].地层学杂志,2012,36(4):679-691. [39] 朱志军,陈洪德,林良彪,等.渝东—湘西地区志留纪小河坝组层序岩相古地理特征及演化[J].地层学杂志,2012,36(3):662-671. [40] 马义波,唐佐其,谯文浪,等.贵州梵净山地区南华系—志留系沉积体系特征及其演化[J].贵州地质,2015,32(1):15-20,26. [41] 梁恩云,刘伟,刘耀荣,等.关于湘西北红岩溪地区沉积-构造-成矿研究的一些认识[J].中国地质调查,2016,3(4):29-36. [42] 马振东,陈颖军.华南扬子与华夏陆块古—中元古代基底地壳微量元素地球化学示踪探讨[J].地球化学,2000,29(6):525-531.
2017, Vol. 4 
