Chronology of the volcanic rock intercalations within the flysch of the Songpan-Ganzi folded belt and its geological significance

LI Xianghui; WANG Chengshan; LIU Shugen; RAN Bo; XU Wenli; ZHOU Yong

2016 Vol. 35, No. 6

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LI Xianghui, WANG Chengshan, LIU Shugen, RAN Bo, XU Wenli, ZHOU Yong. Chronology of the volcanic rock intercalations within the flysch of the Songpan-Ganzi folded belt and its geological significance[J]. Geological Bulletin of China, 2016, 35(6): 879-886.

Citation:

LI Xianghui, WANG Chengshan, LIU Shugen, RAN Bo, XU Wenli, ZHOU Yong. Chronology of the volcanic rock intercalations within the flysch of the Songpan-Ganzi folded belt and its geological significance[J]. Geological Bulletin of China, 2016, 35(6): 879-886.

Chronology of the volcanic rock intercalations within the flysch of the Songpan-Ganzi folded belt and its geological significance

1. School of Earth Sciences and Engineering, Nanjing University, Nanjing 210046, Jiangsu, China;
2. College of Geoscience and Resources, Research Center of Tibetan Plateau Geology, China University of Geoscience(Beijing), Beijing 100083, China;
3. State Key Laboratory of Oil-Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, Sichuan, China;
4. No. 402 th Geological Party, Sichuan Bureau of Geology and Mineral Resources, Chengdu 611730, Sichuan, China

Received Date: 06 September 2015

Revised Date: 09 March 2016

Publish Date: 15 June 2016

Abstract

Abstract

Several intercalations of volcanic and pyroclastic rocks were firstly discovered within the flysch of the Songpan-Ganzi folded belt. Samples were taken in northwestern Songpan of Sichuan and southwestern Hezuo of Gansu. Using U-Pb isotope mea-surement of LA-ICP-MS, the authors conducted dating of four samples and obtained ages of 205.9±1.6Ma, 208.9±1.8Ma, 210.4±1.6Ma and 212.3±1.5Ma separately, precisely showing the late Norian-early Rhaetian age of the Late Triassic. These are the age representatives of volcanic eruptions during the flysch accumulation and indicate that the deposition might have not stopped until the early Rhaetian. The discovery of the dated volcanic rocks would benefit the stratigraphic classification and correlation of the Up-per Triassic flysch within the Songpan-Ganzi folded belt, and can provide evidence and age constraints for the collision and oroge-ny between blocks of South and North China.
- U-Pb chronology of zircon /
- andesite /
- tuff /
- flysch /
- Late Triassic /
- Songpan-Ganzi folded belt

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References

[1]	Mattauer M, Matte P, Malavieille J, et al. Tectonics of the Qinling belt:build up and evolution of eastern Asia[J]. Nature,1985, 317:496-500. Google Scholar
[2]	张国伟,孟庆任,赖绍聪. 秦岭造山的结构构造[J]. 中国科学, 1995, B25:994-1003. Google Scholar
[3]	Chang E Z. Collisional orogen between north and south China and its eastern extension in the Korean Peninsula[J]. J. E Asi.Ear.Sci., 1996, 13(3/5):267-277. Google Scholar
[4]	Zhang R Y, Liou J G, Ernst W G. The Dabie-Sulu continental col-lision zone:A comprehensive review[J]. Gond. Res., 2009, 16:1-26. Google Scholar
[5]	Wang X X, Wang T, Castro A, et al. Triassic granitoids of the Qin-ling orogen, central China:Genetic relationship of enclaves and rapakivi-textured rocks[J]. Lithos, 2011, 126:369-387. Google Scholar
[6]	Hacker B R, Ratschbacher L, Liou J G. Subduction, collision, and exhumation in the Qinling-Dabie Orogen[J]. J. Geol. Soc. London, 2004, 226:157-175. Google Scholar
[7]	Wu Yu B, Gao S, Zhang H F, et al. Timing of UHP metamorphism in the Hong'an area, western Dabie Mountains, China:evidence from zircon U-Pb age, trace element and Hf isotope composition[J]. Contr.Minl. Petrol., 2008, 155:123-133. Google Scholar
[8]	Dong Y P, Zhang G W, NeubauerF, et al. Tectonic evolution of the Qinling orogen, China:Review and synthesis[J]. J. Asi. Ear. Sci., 2011, 41:213-237. Google Scholar
[9]	Wu Y B, Zheng Y F. Tectonic evolution of a composite collision orogen:an overview on the Qinling-Tongbai-Hong'an-Dabie-Sulu orogenic belt in central China[J]. Gond. Res., 2013, 23:1402-1428. Google Scholar
[10]	Dong Y P, Santosh M. Tectonic architecture and multiple orogeny of the Qinling Orogenic Belt, Central China[J]. Gond. Res., 2016, 29:1-40. Google Scholar
[11]	殷鸿福, 杨逢清, 黄其胜, 等. 秦岭及邻区三叠系[M]. 武汉:中国地质大学出版社, 1992:129. Google Scholar
[12]	Van Achterbergh E. Data reduction software for LA-ICP-MS[C]//Paul J S. Laser-Ablation-ICPMS in the Earth sciences:Principles and applications. Ottawa. Minl. Assoc. Canada, Short Course Se-ries, 2001,29:239-243. Google Scholar
[13]	Andersen T. Correction of common lead in U-Pb analyses that do not report ²⁰⁴Pb[J]. Chem. Geo., 2002, 192(1/2):59-79. Google Scholar
[14]	Ludwig K. User's Manual for Isoplot 3.00:A Geochronological Toolkit for Microsoft Excel[M]. Berkeley:Geochronology Center Special Publication, 2003:4-70. Google Scholar
[15]	Weislogel A L, Graham S A, Chang E Z, et al. Detrital zircon prov-enance of the Late Triassic Songpan-Ganzi complex:Sedimentary record of collision of the North and South China blocks[J]. Geolo-gy,2006, 34(2):97-100. Google Scholar
[16]	Zhang Y X, Zeng L, Li Z W, et al. Late Permian-Triassic siliciclas-tic provenance, palaeogeography, and crustal growth of the Song-pan terrane, easternTibetan Plateau:evidence from U-Pb ages, trace elements, and Hf isotopes of detrital zircons[J].Inter. Geo. Rev.,2015, 57(2):159-181. doi:10.1080/00206814.2014.999356. Google Scholar
[17]	李祥辉,王成善,刘树根,等. 西秦岭南部白龙江隆起中三叠统光盖山组岩相及盆地分析意义[J]. 地球科学——中国地质大学学报,2012, 37(4):679-692. Google Scholar
[18]	Zhang C K, Li X H, Mattern F, et al. Deposystem architectures and lithofacies of a submarine fan-dominated deep sea succession in an orogen:A case study from the Upper Triassic Langjiexue Group of southern Tibet)[J]. J. Asi. Ear. Sci., 2015, 111:222-243. doi.org/10.1016/j.jseaes.2015.07.013 Google Scholar
[19]	Roger F, Calassou S. Géochronologie U-Pb sur zircons etgéochim-ie (Pb, Sr et Nd) du socle de la chaîne de Songpan-Garzê (Chine)[J]. C. R. Acad. Sci. Paris, Ser.,1997, 324:819-826. Google Scholar
[20]	Roger F, Malavieille J, Leloup P H, et al. Timing of granite em-placement and cooling in the Songpan-Garzê fold belt (eastern Ti-betan plateau) with tectonic implications[J].J. Asi. Ear. Sci., 2004, 22:465-481. Google Scholar
[21]	Zhang H F, Zhang L, Harris N J, et al. U-Pb zircon ages, geo-chemical and isotopic compositions ofgranitoids in Songpan-Garze fold belt, eastern Tibetan Plateau:constraints on petrogenesis and tectonic evolution of the basement[J].Contrib. Mineral. Petrol., 2006,152:75-88. Google Scholar
[22]	骆必继,张宏飞,肖尊奇.西秦岭印支早期美武岩体的岩石成因及其构造意义[J].地学前缘,2012, 19(3):199-213. Google Scholar
[23]	骆必继. 西秦岭造山带印支期岩浆作用及深部过程[D].中国地质大学(武汉)博士学位论文,2013. Google Scholar
[24]	张旗. 碰撞与花岗岩:碰撞是构造事件,不是构造环境[J]. 岩石矿物学杂志,2012,31(5):745-749. Google Scholar
[25]	Jiang Y H, Jin G D, Liao S Y, et al. Geochemical and Sr-Nd-Hf isotopicconstraints on the origin of Late Triassic granitoids from the Qinling orogen, central China:implications for a continental arc to continent-continent collision[J]. Lithos, 2010,117:183-197. Google Scholar