Geochemical characteristics of trace elements and tectonic setting of sandstones from the Upper Ordovician Pingliang Formation, southwestern margin of Ordos Basin: A case study of the Duanjiaxia profile, Longxian County
Liuzhu Rui-Zhi1,2, He You-Bin2, Li Hua2, Huang Wei2
1 Research Institute of Petroleum Exploration & Development,PetroChina,Beijing 100083,China; 2 School of Geosciences,Yangtze University,Wuhan 430100,China
Abstract：Due to the lack of reliable sedimentary provenance data,the geological setting and its provenance of the southwestern margin of Ordos Basin in Late Ordovician is uncertain. In this paper,the sandstone of Upper Ordovician Pingliang Formation in Duanjiaxia profile of Longxian area is selected for a systematic study. Using the methods including the comprehensive analysis on the measured geological profile,analysis of microscopic thin section and trace elements,the following results are obtained: (1)the thin section analysis shows that the sandstone is well sorted but poorly rounded. Clastic grains are dominated by quartz,while the rock fragments are mainly composed of polycrystalline quartz,carbonate sand debris,and a little matrix,which means that the turbidite sandstone has been reworked by obvious traction of deep-water;(2)Rare Earth Element(REE)distribution model shows that the sandstone is rich in LREE and is short of HREE and has the negative Eu-anomaly,indicating that the provenance may derive from the intermediate and acid rock in the upper crust;(3)the provenance discrimination diagrams show that the sandstone of the Pingliang Formation is a mixture of sedimentary rock and granite,while the magmatic component is dominated by intermediate and acid rock;(4)Geochemical data of the sandstone suggests that the geological setting significantly belong to continental island arc and passive continental settings. The study area in Longxian during the Late Ordovician period was located in the back arc basin. At that time,the southwestern margin of the North China Craton with the full trench-arc-basin system was changed from the passive continental margin into the active continental margin.
Liuzhu Rui-Zhi,He You-Bin,Li Hua et al. Geochemical characteristics of trace elements and tectonic setting of sandstones from the Upper Ordovician Pingliang Formation, southwestern margin of Ordos Basin: A case study of the Duanjiaxia profile, Longxian County[J]. JOPC, 2020, 22(2): 333-348.
[1] 陈诚,史晓颖,裴云鹏,王新强. 2012. 鄂尔多斯盆地南缘晚奥陶世钾质斑脱岩: SHRIMP测年及其成因环境. 现代地质, 26(2): 205-219. [Chen C,Shi X Y,Pei Y P,Wang X Q.2012. K-bentonites from the Jinsushan Formation of Late Ordovician,southern Ordos Basin: SHRIMP dating and tectonic environment. Geoscience, 26(2): 205-219] [2] 陈小炜,牟传龙,葛祥英,周恳恳,王启宇. 2014. 华北板块西南缘早古生代构造演化与沉积响应: 以段家峡剖面为例. 海洋地质与第四纪地质, 34(5): 73-80. [Chen X W,Mou C L,Ge X Y,Zhou K K,Wang Q Y.2014. Tectonic evolution of southwest margin of North China in Early Palaeozoic and its sedimentary response: A case study of the Duanjiaxia profile. Marine Geology & Quaternary Geology, 34(5): 73-80] [3] 崔智林,华洪,宋庆原. 2000. 晚奥陶世北秦岭弧后盆地放射虫组合. 地质学报, 74(3): 254-258. [Cui Z L,Hua H,Song Q Y.2000. The Late Ordovician radiolarian assemblage of the North Qinling back-arc basin,China. Acta Geologica Sinica, 74(3): 254-258] [4] 杜远生,朱杰,韩欣,顾松竹. 2004. 从弧后盆地到前陆盆地: 北祁连造山带奥陶纪—泥盆纪的沉积盆地与构造演化. 地质通报, 23(9-10): 911-917. [Du Y S,Zhu J,Han X,Gu S Z.2004. From the back-arc basin to foreland basin: Ordovician-Devonian sedimentary basin and tectonic evolution in the North Qilian orogenic belt. Geologcal Bulletin of China, 23(9-10): 911-917] [5] 高振中,罗顺社,何幼斌,张吉森. 1995. 鄂尔多斯西缘奥陶纪海底扇沉积体系. 石油与天然气地质, 16(2): 119-125. [Gao Z Z,Luo S S,He Y B,Zhang J S.1995. Ordovician submarine fan system in west margin of Ordos. Oil & Gas Geology, 16(2): 119-125] [6] 何幼斌,高振中,罗顺社,彭德堂,王宏伟,罗进雄. 2007. 陕西陇县地区平凉组三段发现内潮汐沉积. 石油天然气学报, 29(4): 28-33. [He Y B,Gao Z Z,Luo S S,Peng D T,Wang H W,Luo J X.2007. Discovery of internal-tide deposits from the Third Member of Pingliang Formation in Longxian area,Shaanxi Province. Journal of Oil and Gas Technology, 29(4): 28-33] [7] 黄喜峰,钱壮志,逯东霞,吴文奎,陆彦俊,白生明. 2010. 贺兰山中南段米钵山组沉积特征及其物源分析. 沉积学报, 28(3): 426-433. [Huang X F,Qian Z Z,Lu D X,Wu W K,Lu Y J,Bai S M.2010. Depositional characteristics and provenance analysis of the Miboshan Formation,Helan Mountain. Acta Sedimentology Sinica, 28(3): 426-433] [8] 蒋苏扬,黄文辉,张永生,刑恩袁,桂宝玲,彭渊,赵海彤,商雯君. 2019. 鄂尔多斯盆地西缘北段三道坎组砂岩构造背景及物源分析. 东北石油大学学报, 43(4): 17-28. [Jiang S Y,Huang W H,Zhang Y S,Xing E Y,Gui B L,Peng Y,Zhao H T,Shang W J.2019. Tectonic background and provenance analysis of sandstones in Sandaokan Formation,northern part of western margin in Ordos Basin. Journal of Northeast Petroleum University, 43(4): 17-28] [9] 李华,何幼斌,黄伟,刘朱睿鸷,张锦. 2016. 鄂尔多斯盆地南缘奥陶系平凉组等深流沉积. 古地理学报, 18(4): 631-642. [Li H,He Y B,Huang W,Liuzhu R Z,Zhang J.2016. Contourites of the Ordovician Pingliang Formation in southern margin of Ordos Basin. Journal of Palaeogeography(Chinese Editon), 18(4): 631-642] [10] 李华,何幼斌,刘朱睿鸷,黄伟,张锦,张灿,王季欣,黄瑾. 2017. 鄂尔多斯盆地西南缘奥陶系平凉组重力流沉积特征. 中国科技论文, 12(15): 1774-1779. [Li H,He Y B,Liuzhu R Z,Huang W,Zhang J,Zhang C,Wang J X,Huang J.2017. Characteristic of gravity flow deposit in Pingliang Formation of Ordovician in the southwest margin of the Ordos Basin. China Sciencepaper, 12(15): 1774-1779] [11] 李华,何幼斌. 2018. 鄂尔多斯盆地西南缘奥陶系平凉组改造砂沉积特征及意义. 石油与天然气地质, 39(2): 384-397. [Li H,He Y B.2018. Sedimentary characteristics and significance of reworked sands in the Ordovician Pingliang Formation,southwestern margin of Ordos Basin. Oil & Gas Geology, 39(2): 384-397] [12] 李文厚,陈强,李智超,王若谷,王研,马瑶. 2012. 鄂尔多斯地区早古生代岩相古地理. 古地理学报, 14(1): 85-100. [Li W H,Chen Q,Li Z C,Wang R G,Wang Y,Ma Y.2012. Lithofacies palaeogeography of the Early Paleozoic in Ordos area. Journal of Palaeogeography(Chinese Edition), 14(1): 85-100] [13] 李向东,何幼斌,刘训,游国庆,王丹,郑昭昌. 2011. 宁夏中奥陶统香山群徐家圈组大地构造环境分析. 中国地质, 38(2): 374-383. [Li X D,He Y B,Liu X,You G Q,Wang D,Zheng Z C.2011. An analysis of the tectonic setting of Xujiajuan Formation of Middle Ordovician Xiangshan Group in Ningxia. Geology in China, 38(2): 374-383] [14] 李振宏. 2011. 鄂尔多斯盆地对秦岭造山过程的构造沉积响应. 中国地质科学院博士论文. [Li Z H.2011. Response to Qinling Orogenic with the Tectonic and Sedimentary Evolution of Ordos Basin. Doctoral Dissertation of Chinese Academy of Geological Sciences] [15] 李振宏,徐黎明,刘新社,袁效奇,胡健民. 2015. 鄂尔多斯盆地南缘奥陶纪沉积充填记录的关键时限及其构造意义. 地质科学, 50(2): 428-445. [Li Z H,Xu L M,Liu X S,Yuan X Q,Hu J M.2015. Critical timing of sedimentary filling records of Ordovician and its significance on the southern Ordos Basin. Chinese Journal of Geology, 50(2): 428-445] [16] 林畅松,杨起,李思田,李祯. 1991. 贺兰奥拉槽早古生代深水重力流体系的沉积特征和充填样式. 现代地质, 5(3): 252-262. [Lin C S,Yang Q,Li S T,Li Z.1991. Sedimentary characters of the Paleozoic deep water gravity flow systems and basin filling style in the Helan aulacogen,Northwest China. Geoscience, 5(3): 252-262] [17] 梅志超,陈景维,卢焕勇,李文厚. 1982. 陕西富平中奥陶统平凉组的深水碳酸盐碎屑流. 石油与天然气地质, 3(1): 49-56. [Mei Z C,Chen J W,Lu H Y,Li W H.1982. Deep water carbonate debris flow in the Middle Ordovician Pingliang Formation of Fuping,Shaanxi. Oil & Gas Geology, 3(1): 49-56] [18] 钱锋,艾永峰. 2002. 鄂尔多斯南部地区早古生代主动大陆边缘演化特征. 地球科学与环境学报, 24(1): 18-21. [Qian F,Ai Y F.2002. Characteristics and evolution of active continental margin during Early Paleozoic Era in southern Ordos. Journal of Xi’ an Engineering University, 24(1): 18-21] [19] 宋述光,张立飞,Y.Niu,宋彪,张贵宾,王乾杰. 2004. 北祁连山榴辉岩锆石SHRIMP定年及其构造意义. 科学通报, 49(6): 592-595. [Song S G,Zhang L F,Niu Y,Song B,Zhang G B,Wang Q J.2004. Zircon SHRIMP dating of eclogites from North Qilian Mountains and its tectonic significance. Chinese Science Bulletin, 49(6): 592-595] [20] 孙肇才,胡显穆. 2002. 鄂尔多斯盆地西南缘奥陶系的对比划分意见及其对中西部油气勘探的意义. 海相油气地质, 7(4): 41-58,5. [Sun Z C,Hu X M.2002. View on the correlation and demarcation of the Ordovician strata in the southwestern margin region of Ordos Basin and the signification of petroleum exploration in central-western part of China. Marine Origin Petroleum Geology, 7(4): 41-58,5] [21] 王浩霖,常山. 2012. 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. 资源调查与环境, 33(3): 198-205. [Wang H L,Chang S.2012. Analysis on geochemistry and tectonic setting of sandstones from the Ordovician Miboshan Formation in the middle section of Helan Mountain. Resources Survey & Environment, 33(3): 198-205] [22] 王随继,黄杏珍,妥进才,邵宏舜,阎存凤,王寿庆,何祖荣. 1997. 泌阳凹陷核桃园组微量元素演化特征及其古气候意义. 沉积学报, 15(1): 66-71. [Wang S J,Huang X Z,Tuo J C,Shao H S,Yan C F,Wang S Q,He Z R.1997. Evolutional characteristics and their paleoclimate significance of trace elements in the Hetaoyuan Formation,Biyang Depression. Acta Sedimentologica Sinica, 15(1): 66-71] [23] 王振涛,周洪瑞,王训练,景秀春. 2014. 贺兰山地区中奥陶统樱桃沟组物源及构造背景分析. 沉积学报, 32(2): 205-217. [Wang Z T,Zhou H R,Wang X L,Jing X C.2014. Provenance and tectonic settings analysis of Yingtaogou Formation of Middle Ordovician in Helan Mountain area. Acta Sedimentologica Sinica, 32(2): 205-217] [24] 王振涛,周洪瑞,王训练,张永生,景秀春,邢恩袁. 2015a. 鄂尔多斯盆地西、南缘奥陶纪地质事件群耦合作用. 地质学报, 89(11): 1990-2004. [Wang Z T,Zhou H R,Wang X L,Zhang Y S,Jing X C,Xing E Y.2015a. Ordovician geological events group in the West and South Ordos Basin. Acta Geologica Sinica, 89(11): 1990-2004] [25] 王振涛,周洪瑞,王训练,景秀春,张永生. 2015b. 鄂尔多斯盆地西南缘奥陶纪火山活动记录: 来自陕甘地区平凉组钾质斑脱岩地球化学和锆石年代学的信息. 岩石学报, 31(9): 2633-2654. [Wang Z T,Zhou H R,Wang X L,Jing X C,Zhang Y S.2015b. Volcanic event records at the southwestern Ordos Basin: The message from geochemical and zircon U-Pb geochronology of Kbentonites from Pingliang Formation,Shaanxi and Gansu region. Acta Petrologica Sinica, 31(9): 2633-2654] [26] 王振涛,周洪瑞,王训练,景秀春,张永生,袁路朋,沈智军. 2016. 鄂尔多斯盆地西缘北部奥陶纪盆地原型: 来自贺兰山和桌子山地区奥陶系的沉积响应. 地质论评, 62(4): 1041-1061. [Wang Z T,Zhou H R,Wang X L,Jing X C,Zhang Y S,Yuan L P,Shen Z J.2016. The Ordovician basin prototype in the northwest Ordos Basin: Constraint from the Ordovician sedimentary respond in the Helan-Zhuozi Mountains. Geological Review, 62(4): 1040-1061] [27] 王振涛,王训练. 2018. 华北西部贺兰山—桌子山及周缘地区奥陶纪构造演化与沉积响应研究评述. 科技导报, 36(23): 68-86. [Wang Z T,Wang X L.2018. Ordovician tectonic evolution and sedimentary response in the Helanshan-Zhuozishan Mountains and the peripheral regions,western North China: A review. Science & Technology Review, 36(23): 68-86] [28] 吴胜和,冯增昭,张吉森. 1994. 鄂尔多斯地区西缘及南缘中奥陶统平凉组重力流沉积. 石油与天然气地质, 15(3): 226-234. [Wu S H,Feng Z Z,Zhang J S.1994. Sedimentology of gravity flow deposits of Middle Ordovician Pingliang Formation in west and south margins of Ordos. Oil & Gas Geology, 15(3): 226-234] [29] 吴素娟,李振宏,胡健民,公王斌. 2014. 鄂尔多斯盆地南缘赵老峪剖面奥陶系凝灰岩锆石SHRIMP U-Pb定年及其地质意义. 地质论评, 60(4): 903-912. [Wu S J,Li Z H,Hu J M,Gong W B.2014. Confirmation of Ordovician sediments in south margin of Ordos Basin by SHRIMP U-Pb zircon dating of volcanic tuff interlayers and its significance. Geological Review, 60(4): 903-912] [30] 吴素娟,张永生,邢恩袁. 2016. 桌子山地区奥陶系乌拉力克组碎屑岩地球化学特征及其对物源的制约. 地质学报, 90(8): 1860-1873. [Wu S J,Zhang Y S,Xing E Y.2016. Geochemistry of Ordovician detrital rocks and its constrains on provenance in Zhuozishan area,northwest Ordos Basin. Acta Geologica Sinica, 90(8): 1860-1873] [31] 吴素娟,张永生,邢恩袁. 2017. 鄂尔多斯盆地西北缘奥陶纪凝灰岩锆石U-Pb年龄、Hf同位素特征及地质意义. 地质论评, 63(5): 1309-1327. [Wu S J,Zhang Y S,Xing E Y.2017. Zircon U-Pb ages and Hf isotope characteristics and their geological significance of tuff in Wulalike Formation in the northwestern Ordos Basin. Geological Review, 63(5): 1309-1327] [32] 徐学义,何世平,王洪亮,张二朋,陈隽璐,孙吉明. 2008. 早古生代北秦岭—北祁连结合部构造格局的地层及构造岩浆事件约束. 西北地质, 41(1): 1-21. [Xu X Y,He S P,Wang H L,Zhang E P,Chen J L,Sun J M.2008. Tectonic framework of North Qinling Mountain and North Qilian Mountain conjunction area in Early Paleozoic: A study of the evidences from strata and tectonic-magmatic events. Northwestern Geology, 41(1): 1-21] [33] 徐亚军,杜远生,杨江海,文运强,王建奎. 2011. 北祁连造山带东段上奥陶统—下、中泥盆统砂岩碎屑组分与物源分析. 地质科技情报, 30(2): 28-33. [Xu Y J,Du Y S,Yang J H,Wen Y Q,Wang J K.2011. Detrital composition and provenance of sandstones from the Upper Ordovician to Lower-Middle Devonian,the eastern part of North Qilian Orogenic Belt. Geological Science and Technology Information, 30(2): 28-33] [34] 徐亚军,杜远生,杨江海. 2013. 北祁连造山带晚奥陶世—泥盆纪构造演化: 碎屑锆石年代学证据. 地球科学, 38(5): 934-946. [Xu Y J,Du Y S,Yang J H.2013. Tectonic evolution of the North Qilian Orogenic Belt from the Late Ordovician to Devonian: Evidence from detrital zircon geochronology. Earth Science, 38(5): 934-946] [35] 闫全人,王宗起,闫臻,王涛,张宏远,向忠金,姜春发,高联达. 2009. 从华北陆块南缘大洋扩张到北秦岭造山带板块俯冲的转换时限. 地质学报, 83(11): 1565-1583. [Yan Q R,Wang Z Q,Yan Z,Wang T,Zhang H Y,Xiang Z J,Jiang C F,Gao L D.2009. Timing of the transformation from seafloor spreading on the south margin of the North China Block to subduction within the North Qinling Orogenic Belt. Acta Geologica Sinica, 83(11): 1565-1583] [36] 袁卫国. 1995. 鄂尔多斯盆地南缘中奥陶统火山凝灰岩的研究与意义. 石油实验地质, 17(2): 167-170. [Yuan W G.1995. Resasearch and significance of volcanic tuff from Mid-Ordovician series in the southern margin of the Ordos Basin. Petroleum Geology and Experiment, 17(2): 167-170] [37] 袁卫国,赵一鸣. 1996. 鄂尔多斯南部地区早古生代被动大陆边缘特征与演化. 西北大学学报(自然科学版), 26(5): 84-87. [Yuan W G,Zhao Y M.1996. Characteristics and evolution of passive continental margin during Early Palaeozoic Era in southern Ordos. Journal of Northwest University(Natural Science Edition), 26(5): 84-87] [38] 杨甫. 2015. 鄂尔多斯地块西南部早古生代海相盆地原型及其对油气地质条件的制约. 西北大学博士论文. [Yang F.2015. Marine Basin Prototype of Early Paleozoic in the Southwestern Ordos Block and Its Restriction on Oil and Gas Geological Conditions. Doctoral Dissertation of Northwest University] [39] 杨甫,陈刚,陈强,丁超,高磊,雷盼盼,张文龙,师晓林,童明军. 2015. 鄂尔多斯盆地西南缘上奥陶统平凉组碎屑岩锆石U-Pb年龄及物源分析. 地质论评, 61(1): 172-182. [Yang F,Chen G,Chen Q,Ding C,Gao L,Lei P P,Zhang W L,Shi X L,Tong M J.2015. U-Pb dating of detrital zircon from Upper Ordovician Pingliang Formation in the southwest margin of the Ordos Basin and provenance analysis. Geological Review, 61(1): 172-182] [40] 杨江海,杜远生,朱杰. 2007. 甘肃景泰崔家墩下奥陶统阴沟组砂岩化学组分特征及物源区构造背景判别. 古地理学报, 9(2): 197-206. [Yang J H,Du Y S,Zhu J.2007. Chemical component characteristics of sandstone and recognition to provenance tectonic setting of the Yingou Formation of Lower Ordovician at Cuijiadun section,Jingtai County of Gansu Province. Journal of Palaeogeography(Chinese Edition), 9(2): 197-206] [41] 张国伟,孟庆任,于在平,孙勇,周鼎武,郭安林. 1996. 秦岭造山带的造山过程及其动力学特征. 中国科学: D辑, 26(3): 193-200. [Zhang G W,Meng Q R,Yu Z P,Sun Y,Zhou D W,Guo A L.1996. Orogenic process and dynamic characteristics of Qinling orogenic belt. Science in China(Series D), 26(3): 193-200] [42] 张进,马宗晋,任文军. 2004. 再论贺兰山地区新生代之前拉张活动的性质. 石油学报, 25(6): 8-11,17. [Zhang J,Ma Z J,Ren W J.2004. Rediscussion on natures of extension in Helanshan region before Cenozoic era. Acta Petrolei Sinica, 25(6): 8-11,17] [43] 张进,李锦轶,刘建峰,李岩峰,曲军峰,冯乾文. 2012. 早古生代阿拉善地块与华北地块之间的关系: 来自阿拉善东缘中奥陶统碎屑锆石的信息. 岩石学报, 28(9): 2912-2934. [Zhang J,Li J Y,Liu J F,Li Y F,Qu J F,Feng Q W.2012. The relationship between the Alxa Block and the North China Plate during the Early Paleozoic: New information from the Middle Ordovician detrial zircon ages in the eastern Alxa Block. Acta Petrologica Sinica, 28(9): 2912-2934] [44] 张英利,王宗起,闫臻,王涛. 2011. 库鲁克塔格地区新元古代贝义西组的构造环境: 来自碎屑岩地球化学的证据. 岩石学报, 27(6): 1785-1796. [Zhang Y L,Wang Z Q,Yan Z,Wang T.2011. Tectonic setting of Neoproterozoic Beiyixi Formation in Quruqtagh area,Xinjiang: Evidence from geochemistry of clastic rocks. Acta Petrologica Sinica, 27(6): 1785-1796] [45] Allègre C J.1978. Minster. Quantitative models of trace element behavior in magmatic processes. Earth & Planetary Science Letters, 38(1): 1-25. [46] Boynton W.1984. Cosmochemistry of the Rare Earth Elements: Meteorite Studies. In: Henderson D(ed). Rare Earth Element Geochemistry. Amsterdam: Elsevier,63-114. [47] Bhatia M R.1985. Rare earth element geochemistry of Australian Paleozoic graywackes and mudrocks: Provenance and tectonic control. Sedimentary Geology, 45(1): 97-113. [48] Bhatia M R,Crook K A W.1986. Trace element characteristics of graywackes and tectonic setting discrimination of sedimentary basins. Contributions to Mineralogy Petrology,(2): 181-193. [49] Floyd P A,Leveridge B E.1987. Tectonic environment of the Devonian Gramscatho basin,South Cornwall: Framework mode and geochemical evidence from turbiditic sandstones. Journal of the Geology Society, 144(4): 531-542. [50] Dickinson W R.1985. Interpreting provenance relations from detrital modes of sandstones. In: Zuffa G G(ed). Provenance of Arenites. Netherlands: D. Reidel Publishing Company,333-361. [51] Gu X X,Liu J M,Zheng M H,Tang J X,Qi L.2002. Provenance and tectonic setting of the Proterozoic turbidites in Hunan,South China: Geochemical evidence. Journal of Sedimentary Research, 72(3): 393-407. [52] Mclennan S M,Hemming S,Mcdaniel D K.1993. Geochemical approaches to sedimentation,provenance,and tectonics. Special Paper of the Geological Society of America, 284: 21-40. [53] Mclennan S M.2001. Relationship between the trace element composition of sedimentary rocks and upper continental crust. Geochemistry,Geophysics,Geosystems, 2(4): 203-236. [54] Sinclair H D.1997. Tectono stratigraphic model for underfilled peripheral fo reland basins: An Alpine perspective. GSA Bulletin, 109(3): 324-346. [55] Shields G,Stille P.2001. Diagenetic constraints on the use of cerium anomalies as palaeoseawater redox proxies: An isotopic and REE study of Cambrian phosphorites. Chemical Geology, 175(1-2): 29-48. [56] Yang J H,Du Y S,Cawood P A,Xu Y J.2012. From subduction to collision in the northern Tibetan Plateau: Evidence from the Early Silurian clastic rocks,NW China. Journal of Geology, 120: 49-67. [57] Zhang J,Li J Y,Liu J F,Feng Q W.2011. Detrital zircon U-Pb ages of Middle Ordovician flysch sandstones in the western Ordos margin: New constraints on their provenances,and tectonic implications. Journal of Asian Earth Sciences, 42: 1030-1047. [58] Zhao X C,Liu C Y,Wang J Q,Duan L,Zhao Y,Zhao Q H,Luo W.2017. Petrology,geochemistry and zircon U-Pb geochronology of the Xiangshan Group in the eastern Hexi Corridor Belt: Implications for provenance and tectonic evolution. Acta Geologica Sinica(English Edition), 91(5): 1680-1703.
