Abstract：To better understand the deposition and sea level change histories of the Ladinian carbonate platform margin in the South China,this paper studied the sedimentary characteristics of the Middle Triassic Longtou Formation at the Pazichang section,Guizhou Province. The Longtou Formation is divided into 3 members based on lithofacies and their associations. The Lower Member of Longtou Formation consists mainly of oncoidal limestones and stromatolites,which are indicative of intertidal to supratidal environments. The Middle Member is composed of oncoidal rudstones,mudstones,laminated limestones,and pisoidal rudstones in the lower part,and oncoidal rudstones and stromatolites in the upper part. Subaerial exposure occurs at the uppermost position of the lower part of Middle Member,where the thickest laminated limestones are deposited. In contrast,the upper Middle Member was probably formed in intertidal to supratidal environment. The Upper Member consists of oncoidal rudstones and peloidal packstones,indicating an intertidal-subtidal environment. The reconstructed sea level change curve suggests a general sea level rise occurring during the Ladinian period in Guizhou. During the deposition of the Middle Member of Longtou Formation,however,sea level underwent a rapid fall, which possibly corresponds to the Ladinian Great Sea-level Regression event. Thereafter,sea level rises gradually and the deposition in tidal environment continues. Hence,the sea level change history during the deposition of the upper Middle Member to the Upper Member is consistent with the global sea level change and that in the southwestern Guizhou. The results provide clues to better understanding the origin of the laminated limestones and the latest Middle Triassic biotic recovery.
Tan Rui-Chang,Li Rong,Wang Yao. Sedimentary characteristics of the Middle Triassic Longtou Formation in Guizhou Province,South China: Implications for sea-level change[J]. JOPC, 2018, 20(3): 389-408.
[1] 陈洪德,曾允孚. 1990. 右江沉积盆地的性质及演化讨论. 沉积与特提斯地质, (1): 28-37. [Chen H D,Zeng Y F.1990. Nature and evolution of the Youjiang Basin. Sedimentary Geology & Tethyan Geology, (1): 28-37] [2] 淡永. 2010. 贵州青岩中三叠统垄头组台地边缘滩相储层特征分析. 海相油气地质, 15(3): 40-44. [Dan Y.2010. Reservoir characteristics of Middle Triassic Longtou shoal facies of platform margin at Qingyan in Guiyang,Guizhou. Marine Origin Petroleum Geology, 15(3): 40-44] [3] 范嘉松. 1996. 中国生物礁与油气. 北京: 海洋出版社,245-274. [Fan J S.1996. The Ancient Organic Reefs of China and Their Relations to Oil and Gas. Beijing: China Ocean Press,245-274] [4] 范嘉松,吴亚生. 2004. 贵州中三叠统上部垄头组的沉积性质: 再论其钙结壳的成因. 地质学报, 78(2): 149-155. [Fan J S,Wu Y S.2004. Sedimentological nature of late Middle Triassic Longtou Formation: Re-discussion on the origin of its caliche crusts. Acta Geologica Sinica, 78(2): 149-155] [5] 冯增昭,鲍志东,吴胜和,李永铁,王国力. 1997. 中国南方早中三叠世岩相古地理. 地质科学, 32(2): 212-220. [Feng Z Z,Bao Z D,Wu S H,Li Y T,Wang G L.1997. Lithofacies palaeogeography of the Early and Middle Triassic of South China. Scientia Geologica Sinica, 32(2): 212-220] [6] 贺自爱,杨宏,周经才. 1980. 贵州中三叠世生物礁. 地质科学, (3): 55-63. [He Z A,Yang H,Zhou J C.1980. The Middle Triassic reef in Guizhou Province. Chinese Journal of Geology, (3): 55-63] [7] 李荣西,魏家庸,肖家飞,王兴理,Lehrmann D J.2003. 黔西南地区早—中三叠世沉积岩相与Ladinian-Carnian期大海侵. 长安大学学报(地球科学版), 25(3): 1-6. [Li R X,Wei J Y,Xiao J F,Wang X L,Lehrmann D J.2003. Early-Middle Triassic sedimentary facies and Ladinian-Carnian transgression in southwestern Guizhou Province,South China. Journal of Chang’an University(Earth Science Edition), 25(3): 1-6] [8] 刘宝珺,张锦泉,叶红专. 1987. 黔西南中三叠世陆棚—斜坡沉积特征. 沉积学报, 5(2): 1-16. [Liu B J,Zhang J Q,Ye H Z.1987. Shelf-slope sedimentary environment of Middle Triassic in Southwest Guizhou. Acta Sedimentologica Sinica, 5(2): 1-16] [9] 牟传龙. 1989. 黔南桂西早中三叠世碳酸盐台地边缘和斜坡沉积模式及其演化. 沉积与特提斯地质, (2): 1-10. [Mou C L.1989. Sedimentary models and the evolution of Early and Middle Triassic carbonate platform margins and slopes in southern Guizhou and western Guangxi. Sedimentary Geology & Tethyan Geology, (2): 1-10] [10] 童金南. 1997. 黔中—黔南中三叠世环境地层学. 湖北武汉: 中国地质大学出版社, 1-128. [Tong J N.1997. The Middle Triassic Environstratigraphy of Central-South Guizhou,SW China. Wuhan,Hubei: China University of Geosciences Press,1-128] [11] 童金南,黄思骥. 1992. 贵州中三叠世岩隆沉积史及地球化学相. 地球科学, 17(3): 319-327. [Tong J N,Huang S J.1992. The development of the Middle Triassic buildup in Guizhou and its geochemical facies. Earth Science, 17(3): 319-327] [12] 魏家庸. 1993. 贵州省贵阳地区的三叠纪地层格架. 地质通报, (2): 97-106. [Wei J Y.1993. The Triassic stratigraphic framework of the Guiyang area,Guizhou Province. Geological Bulletin of China,(2): 97-106] [13] 温俊君,刘建波. 2009. 碳酸盐岩生屑颗粒定量研究: 点计数法的理论分析与应用. 古地理学报, 11(5): 581-592. [Wen J J,Liu J B.2009. Quantitative studies of bioclastic grains in carbonate rocks: Theoretical analysis and application of point-counting method. Journal of Palaeogeography(Chinese Edition), 11(5): 581-592] [14] 徐安全,肖加飞,王雪华,肖腾. 2015. 贵州镇宁地区早—中三叠世地层特征及沉积环境变迁. 贵州地质, 32(2): 98-104. [Xu A Q,Xiao J F,Wang X H,Xiao T.2015. The under strata features and sedimentary environment transition of Early-Middle Triassic in Zhenning,Guizhou. Guizhou Geology, 32(2): 98-104] [15] 徐桂荣. 1992. 贵州关岭扒子场中三叠世绒枝藻植物群的发现. 地球科学, 17(5): 503-511. [Xu G R.1992. Middle Triassic Dasycladaceae from Bazichang of Guanling,Guizhou Province. Earth Science,17(5): 503-511] [16] 殷鸿福. 1982. 中国的拉丁阶问题. 地质论评, 28(3): 235-239. [Yin H F.1982. Discussion on the Ladinian stage in China. Geological Review, 28(3): 235-239] [17] 殷鸿福,童金南,丁梅华,张克信,赖旭龙. 1994. 扬子区晚二叠世—中三叠世海平面变化. 地球科学, 19(5): 627-632. [Yin H F,Tong J N,Ding M H,Zhang K X,Lai X L.1994. Late Permian-Middle Triassic sea level changes of Yangtze Platform. Earth Science, 19(5): 627-632] [18] 曾允孚,刘文均,陈洪德,郑荣才,张锦泉,李孝全. 1995. 华南右江复合盆地的沉积构造演化. 地质学报, (2): 113-124. [Zeng Y F,Liu W J,Cheng H D,Zheng R C,Zhang J Q,Li X Q.1995. Evolution of sedimentation and tectonics of the Youjiang composite basin,South China. Acta Geologica Sinica, (2): 113-124] [19] 朱井泉. 1992. 黔中三叠系台地边缘相碳酸盐岩中的玛瑙纹构造及其成因. 地质科学, (1): 26-37. [Zhu J Q.1992. Agate-like structure and its genesis in Triassic platform-marginal carbonate rocks in the middle part of Guizhou Province. Scientia Geologica Sinica, (1): 26-37] [20] Assereto R,Folk R L.1976. Brick-like texture and radial rays in Triassic pisolites of Lombardy,Italy: A clue to distinguish ancient aragonitic pisolites. Sedimentary Geology, 16(3): 205-222. [21] Bathurst R G C.1966. Boring algae,micrite envelopes and lithification of molluscan biosparites. Geological Journal, 5(1): 15-32. [22] Boni M,Iannace A,Torre M,Zamparelli V.1994. The Ladinian-Carnian reef facies of Monte Caramolo(Calabria Southern Italy). Facies, 30(1): 101-118. [23] Climaco A,Boni M,Iannace A,Zamparelli V.1997. Platform margins,microbial/serpulids bioconstructions and slope-to-basin sediments in the Upper Triassic of the “Verbicaro Unit”(Lucania and Calabria Southern Italy). Facies, 36(1): 37-56. [24] Dahanayake K.1977. Classification of oncoids from the Upper Jurassic carbonates of the French Jura. Sedimentary Geology,18(4): 337-353. [25] Dunham R J.1969. Vadose pisolite in the Capitan reef(Permian),New Mexico and Texas. Depositional Environments in Carbonate Rocks, 14(1): 182-191. [26] Flügel E.2010. Microfacies of Carbonate Rocks. Heidelberg: Springer, 1-984. [27] Haq B U,Hardenbol J,Vail P R.1987. Chronology of fluctuating sea levels since the Triassic. Science, 235: 1156-1167. [28] Harris M T.1993. Reef fabrics,biotic crusts and syndepositional cements of the Latemar reef margin(Middle Triassic),northern Italy. Sedimentology, 40(3): 383-401. [29] Henrich R,Zankl H.1986. Diagenesis of Upper Triassic Wetterstein reefs of the Bavarian Alps. In: Schroeder J H,Purser B H(eds).Reef Diagenesis. Heidelberg: Springer,245-268. [30] Jones B.2010. Warm-water neritic carbonates. In: James N P,Drlrymple R W(eds). Facies Models. Geological Association of Canada: 341-369. [31] Jones M D B.1989. Micro-organisms and crystal fabrics in cave pisoliths from Grand Cayman,British West Indies. Journal of Sedimentary Petrology, 59(3): 387-396. [32] Kuss J.1990. Middle Jurassic calcareous algae from the circum-Arabian area. Facies, 22(1): 59-85. [33] Kuss J,Schlagintweit D G F.1988. Facies and stratigraphy of Early to Middle Cretaceous(Late Aptian-Early Cenomanian)strata from the northern rim of the African craton(Gebel Maghara—Sinai,Egypt). Facies, 19(1): 77-95. [34] Leinfelder R R,Schmid D U.2000. Mesozoic reefal thrombolites and other microbolites. In: Riding R E,Awramik S M(eds). Microbial Sediments.Heidelberg: Springer Berlin Heidelberg,289-294. [35] Lokier S W,Junaibi M A.2016. The petrographic description of carbonate facies: Are we all speaking the same language? Sedimentology, 63(7): 1843-1885. [36] Loucks R G,Folk R L.1976. Fan-like rays of former aragonite in Permian Capitan reef pisolite. Journal of Sedimentary Research, 46: 483-485. [37] Neumann A C,Land L S.1975. Lime mud deposition and calcareous algae in the bight of abaco,bahamas: A budget. Journal of Sedimentary Research,45(4):763-786. [38] Purser B H.1973. The Persian Gulf: Holocene Carbonate Sedimentation and Diagenesis in a Shallow Epicontinental Sea. Heidelberg: Springer Berlin Heidelberg,1-471. [39] Russo F,Mastandrea A,Stefani M,Neri C.2000. Carbonate facies dominated by syndepositional cements: A key component of Middle Triassic platforms. The marmolada case history(Dolomites,Italy). Facies, 42(1): 211-226. [40] Scherer M.1977. Preservation,alteration and multiple cementation of aragonite skeletons from the cassian beds(southern alps),petrographical and geochemical evidence. Neues Jahrbuch für Geologie und Paläontologie-Abhandlungen,154(2):213-262. [41] Scholle P A,Ulmerscholle D S.2003. A Color Guide to the Petrography Carbonate Rocks: Grains,Textures,Porosity,Diagenesis. American Association of Petroleum Geologists Publishers: 1-486. [42] Scotese C R.2001. Atlas of Earth History. Arlington: Paleomap Project, 1-58. [43] Strasser A,Davaud E.1983. Black pebbles of the Purbeckian(Swiss and French Jura): Lithology,geochemistry and origin. Eclogae Geologicae Helvetiae, 76(3): 551-580. [44] Swinchatt J P.1969. Algal boring: A possible depth indicator in carbonate rocks and sediments. Geological Society of America Bulletin,80(7):1391-1396. [45] Tucker M E,Wright V P.1990. Carbonate Sedimentology. Britain: Blackwell Scientific Publishers,1-482. [46] Vera J A,Cisneros C J D.1993. Palaeogeographic significance of black pebbles(Lower Cretaceous,prebetic,southern spain). Palaeogeography, Palaeoclimatology, Palaeoecology, 102(1-2): 89-102. [47] Wagoner der Meer D G,Wagoner den Berg van Saparoea A P H,Wagoner Hinsbergen D J J,Wagoner de Weg R M B,Godderis Y,Le H G,Donnadieu Y.2017. Reconstructing first-order changes in sea level during the Phanerozoic and Neoproterozoic using strontium isotopes. Gondwana Research, 44(1): 22-34. [48] Wu Y S,Yu G L,Jiang H X,Liu L J,Zhao R.2016. Role and lifestyle of calcified cyanobacteria(Stanieria)in Permian-Triassic boundary microbialites. Palaeogeography, Palaeoclimatology, Palaeoecology, 448: 39-47. [49] Yin H F,Tong J N.1996. Late Permian-Middle Triassic sea level changes of Yangtze platform. Journal of Earth Science, 19(1): 101-104. [50] Zeeh S,Bechstädt T,McKenzie J,Richter D K.1995. Diagenetic evolution of the Carnian Wetterstein platforms of the Eastern Alps. Sedimentology, 42(2): 199-222.
