Abstract The widely developed laminated, fine-grained sedimentary rocks of the Lower Cretaceous Xiagou Formation in Qingxi sag of Jiuxi Basin, Gansu Province are rich in ankerite,albites,barites,zeolites and pyrites,and are poor in fluorites,tremolites,halites and clastic chalcopyrites,galenas and sphalerite. The hydrothermal minerals and favorable hydrocarbon conditions have been attracting the attention of many sedimentary geologists and petroleum geologists. In previous studies,most geologists believed that these fine-grained sedimentary rocks were associated with the volcanic activity,or were the products of volcanic material alteration. However, through a systematic study on the geological background,compositions,rock textures,rock structures,inclusions and geochemical features,we believed that these fine-grained sedimentary rocks were the lacustrine white-smoke type exhalative rocks. Six kinds of hydrothermal mineral assemblages were identified,including: Ⅰ albites-ankerites(or ankerites-albites),Ⅱ barites-albites-ankerites,Ⅲ Analcime-albite-ankerites,Ⅳ quartz-albite-ankerites,Ⅴ dickite-ankerites and Ⅵ the single ankerite. Three main types of rock textures were identified,including: ① the microcrystalline textures,②the intraclastic structure and ③ the halite pseudocrystal textures. Four common types of primary sedimentary structures were divided,including: ① the laminated and banded structures,② the network vein filling structures,③ vortical nozzle structures and ④ the syngenetic deformation bedding structures. On the basis of the rock composition,textures and structures,we have identified four occurrence types of exhalative rocks were identified,including the network vein filling type,the water bursting type,the basin deposition and the regional diffusion type. In addition, we establish the sedimentary model of the lacustrine “white smoke type” exhalative rock was established,and explored the significance of this kind of exhalative rock.
Fund:Co-funded by General Program of the National Natural Science Fundation of China(Nos. 41472088;41572097)and Specialized Research Fund for the Doctoral Program of Higher Education(No.20135122110004)
About author: Zheng Rong-Cai, born in 1950, is a professor and doctoral supervisor. He is mainly engaged in sedimentology and petroleum geology.
Cite this article:
Zheng Rong-Cai,Wen Hua-Guo,Li Yun et al. Compositions and texture of lacustrine exhalative rocks from the Lower Cretaceous Xiagou Formation in Qingxi sag of Jiuxi Basin, Gansu[J]. JOPC, 2018, 20(1): 1-18.
Zheng Rong-Cai,Wen Hua-Guo,Li Yun et al. Compositions and texture of lacustrine exhalative rocks from the Lower Cretaceous Xiagou Formation in Qingxi sag of Jiuxi Basin, Gansu[J]. JOPC, 2018, 20(1): 1-18.
[1] 戴朝成,郑荣才,文华国,雷光明,谢春红. 2008. 辽东湾盆地沙河街组湖相白云岩成因研究. 成都理工大学学报(自然科学版),35(2): 187-193. [Dai C C,Zheng R C,Wen H G,Lei G M,Xie C H. 2008. Origin of lacustrine dolomite in Shahejie Formation from Liaodongwan Basin. Journal of Chengdu University of Technology(Science & Technology Edition),35(2): 187-193] [2] 丁振举,刘丛强. 2000. 碧口群古热水系统发育的富铁硅岩稀土元素地球化学证据. 自然科学进展,10(5): 427-434. [Ding Z J,Liu C Q. 2000. Ancient hydrothermal system in Bikouqun-Group: Evidence from REE characteristics of iron-rich siliceous rocks. Progress Natural Science, 10( 5): 427-434] [3] 范铭涛,杨麟科,方国玉,汪满福,李铁锋,朱利东. 2003. 青西凹陷下白垩统湖相喷流岩成因探讨及其意义. 沉积学报,21(4): 560-564. [Fan M T,Yang L K,Fang G Y,Wang M F,Li T F,Zhu L D. 2003. Origin of lacustrine hydrothermal sedimentary rock(Lower Cretaceous)in Qingxi Sag and its significance. Acta Sedimentologica Sinica,21(4): 560-564] [4] 傅饶,郑荣才,常海亮,祁利祺,文华国,李云. 2015. 湖相“白烟型”喷流岩: 新型的致密油储集层类型: 以准噶尔盆地乌尔禾地区风城组为例. 岩性油气藏,27(3): 59-66. [Fu R,Zheng R C,Chang H L,Qi L Q,Wen H G,Li Y. 2015. Sublacustrine white smoke exhalative rock: A new type of tight oil reservoir from Lower Permian Fengcheng Formation in Urho area,Western Junggar Basin. Lithologic Reservoirs,27(3): 59-66] [5] 方维萱,张国伟,黄转莹. 1999. 银硐子—大西沟特大型银多金属矿床中重晶石岩类特征及成岩成矿作用. 岩石学报,15(3): 484-491. [Fang W X,Zhang G W, Huang Z Y. 1999. Characteristics of bariteolites and diagenism-metallogenesis for super-large,silver-polytmetallic deposits in Yingdongzi and Daxigou,Shaanxi. Acta Petrologica Sinica,15(3): 484-491] [6] 高翔,王平康,李秋英,王成善,高远. 2010. 松科1井嫩江组湖相含铁白云石的准确定名和矿物学特征. 岩石矿物学杂志,29(2): 213-218. [Gao X,Wang P K,Li Q Y,Wang C S,Gao Y. 2010. The precise naming and mineralogical characteristics of ferruginous lacustrine dolomite in Well CCSD-SK. Acta Petrologica Et Mineralogica,29(2): 213-218] [7] 郭强,钟大康,张放东,刘新刚,范凌霄,李君军. 2012. 内蒙古二连盆地白音查干凹陷下白垩统湖相白云岩成因. 古地理学报,14(1): 59-68. [Guo Q,Zhong D K,Zhang F D,Liu X G,Fan L X,Li J J. 2012. Origin of the Lower Cretaceous lacustrine dolostones in Baiyinchagan Sag of Erlian Basin,Inner Mongolia. Journal of Palaeogeography(Chinese Edition),14(1): 59-68] [8] 焦鑫,柳益群,周鼎武,汪双双,南云,周宁超,杨焱钧. 2013. “白烟型”热液喷流岩研究进展. 地球科学进展,28(2): 221-232. [Jiao X,Liu Y Q, Zhou D W,Wang S S,Nan Y,Zhou N C,Yang Y J. 2013. Progress of research on “white smoke type” exhalative hydrothermal rocks. Advances in Earth Science,28(2): 221-232] [9] 李朝阳. 1993. 滇西地区陆相热水成矿作用. 铀矿地质,9(1): 14-22. [Li C Y. 1993. Continental thermal ore genesis in the western of Yunan Province. Uranium Geology,9(1): 14-22] [10] 李江海,冯军,牛向龙,郑金武,陈征. 2003. 华北中元古带硫化物黑烟囱发现的初步报道. 岩石学报,19(1): 167-168. [Li J H,Feng J,Niu X L,Zheng J W,Chen Z. 2003. The preliminary report on the discovery of black smoker chimney within the Mesoproterozoic sulphide deposit of North China. Acta Petrologica Sinica,19(1): 167-168] [11] 李乐,姚光庆. 2016. 讨论: 青藏高原北缘酒泉盆地青西凹陷白垩系湖相热水沉积原生白云岩. 中国科学: 地球科学,46(3): 406-410. [Li L,Yao G Q. 2016. Primary dolostone related to the Cretaceous lacustrine hydrothermal sedimentation in Qingxi sag,Jiuquan Basin on the northern Tibetan Plateau: Discussion. Science China: Earth Sciences,59: 866-870,doi:10.1007/s11430-016-5262-3] [12] 梁华英,王秀璋,程景平. 2001. 粤北大沟谷热水沉积钠长石岩岩石化学及稀土元素,沉积学报,19(3): 415-420. [Liang H Y,Wang X Z,Cheng J P. 2001. Chemical composition and REE pattern of hydrothermally deposited Albitite in Northern Guangdong Province. Acta Sedimentologica Sinica,19(3): 415-420] [13] 刘建明,叶杰,张安立,王玉往,姜能. 2001. 一种新类型热水沉积岩: 产在湖相断陷盆地中的菱铁绢云硅质岩. 中国科学(D辑: 地球科学),31(7): 570-577. [Liu J M,Ye J,Zhang A L,Wang Y W,Jiang N. 2001. A new exhalite type: Siderite-sericite chert formed in fault-controlled lacustrine basin. Science in China(Series D),31(7): 570-577] [14] 柳益群,焦鑫,李红,袁明生,Wan Yang,周小虎,梁浩,周鼎武,郑朝阳,孙芹,汪双双. 2011. 新疆三塘湖跃进沟二叠系地幔热液喷流型原生白云岩. 中国科学: 地球科学,41: 1862-1871. [Liu Y Q,Jiao X,Li H,Yuan M S,Yang W,Zhou X H,Liang H,Zhou D W,Zheng C Y,Sun Q,Wang S S. 2011. Primary dolostone formation related to mantle-originated exhalative hydrothermal activities,Permian Yuejingou section,Santanghu area,Xinjiang,NW China. Science China: Earth Science,41: 1862-1871] [15] 罗平,杨式升,马龙,苏丽萍. 2001. 酒西盆地青西凹陷湖相纹层状泥质白云岩中泥级斜长石成因、特征与油气勘探意义. 石油勘探与开发, 28(6): 32-33. [Luo P,Yang S H,Ma L,Su L P. 2001. Origin feature and its significance to the petroleum exploration of the clay size plagioclase in Qingxi depression in Jiuxi Basin. Petroleum Exploration & Development, 28(6): 32-33] [16] 罗平,杨式升,苏丽萍,等. 2002. 酒西盆地湖相纹层状泥质白云岩储集层的形成条件与特征. 见: 油气储集层重点实验室论文集. 北京: 石油工业出版社,32-44. [Luo P,Yang S H,Su L P. 2002. Formation condition and characteristics of lacustrine laminated argillaceous dolomite reservoir in Jiuxi basin. In: Memoir of CNPC Key Laboratory of Oil and Gas Reservoir. Beijing: Petroleum Industry Press,32-44]. [17] 梅洋汤. 2017. 探秘海底盐池—极端环境孕育的独特生态世界. 中国国家地理,(5): 32-38. [Mei Y T. 2017. Explore the unique ecological world of submarine salt pool-extreme environment. Chinese National Geography,(5): 32-38] [18] 庞艳春,林丽,朱利东,陈志刚,李益民,熊永柱,付修根. 2002. 热液喷口生物群的研究现状. 成都理工大学学报,29(4): 448-452. [Pang Y C,Lin L,Zhu L D,Chen Z G,Li Y M,Xiong Y Z,Fu X G. 2002. Research advances in hydrothermal vent communities. Journal of Chengdu University of Technology,29(4): 448-452] [19] 戚华文,胡瑞忠,苏文超,漆亮,冯家毅. 2003. 陆相热水沉积成因硅质岩与超大型锗矿床的成因: 以临沧锗矿床为例. 中国科学(D辑: 地球科学),33(3): 236-246. [Qi H W,Hu R Z,Su W C,Qi L,Feng J Y. 2003. Siliceous rock of terrigenous hot water origin and origin of super-large germanium deposits: A case study of Lincang ore Deposits. Science in China(Series D),33(3): 236-246] [20] 王江海,颜文,常向阳,等. 1998. 陆相热水沉积作用: 以云南地区为例. 北京: 地质出版社,1-132. [Wang J H,Yan W,Chang X Y. 1998. Terrestrial Hydrothermal Sedimentation: A Case Study of Yunnan Area. Beijing: Geological Publishing House,1-132] [21] 魏菊英,王关玉. 1988. 同位素地球化学. 北京: 地质出版社. [Wei J Y,Wang G Y. 1988. Isotope Geochemistry. Beijing: Geological Publishing House] [22] 文华国. 2008. 酒泉盆地青西凹陷湖相“白烟型”热水沉积岩地质地球化学特征及成因. 成都理工大学博士论文. [Wen H G. 2008. Geochemical characteristics and genesis of lacustrine “White Smoke Type”hydrothermal sedimentary rock in Qingxi sag,Jiuquan Basin. Doctoral Dissertation of Chengdu University of Technology] [23] 文华国,郑荣才,HaiRuo QING,范铭涛,李雅楠,宫博识. 2014. 青藏高原北缘酒泉盆地青西凹陷白垩系湖相热水沉积原生白云岩. 中国科学: 地球科学,44(4): 59-604. [Wen H G,Zheng R C,Qing H R,Fan M T,Li Y N,Gong B S. 2013. Primary dolostone related to the Cretaceous lacustrine hydrothermal sedimentation in Qingxi sag,Jiuquan Basin on the northern Tibetan Plateau. Science China: Earth Sciences,56: 2080-2093,doi:10.1007/s11430-013-4654-x] [24] 肖荣阁,杨忠芳,杨卫东,李朝阳. 1994. 热水成矿作用. 地学前缘, 1(3-4): 140-147. [Xiao R G,Yang Z F,Yang W D,Li Z Y. 1994. Thermal ore genesis. Geoscience Frontier,1(3-4): 140-147] [25] 叶杰,刘建明,张安立,张端斌. 2002. 沉积喷流型矿化的岩石学证据: 以大兴安岭南段黄岗和大井矿床为例. 岩石学报,18(4): 585-592. [Ye J,Liu J M,Zhang A L,Zhang D B. 2002. Petrological evidence for exhalative minerlization: Case studies of Huanggang and Dajing deposits in the southern segment of the Da Hinggan Mountains. China Acta Petrologica Sinica,18(4): 585-592] [26] 应凤祥. 1993. 中国相陆碎屑岩中的自生矿物. 见: 中国油气储集层研究论文集. 北京: 石油工业出版社,1-19. [Ying F X. 1993. Authigenous Mineral in Continental Fragmentary Rock in China. In: Chinese Oil-gas Reservoir Research Memoir. Beijing: Petroleum Industry Press,1-19] [27] 郑荣才,王成善,朱利东,刘红军,方国玉,杜文博,王崇孝,汪满福. 2003. 酒西盆地首例湖相“白烟型”喷流岩的发现及其意义. 成都理工大学学报(自然科学版),30(1): 1-9. [Zheng R C,Wang C S,Zhu L D,Liu H J,Fang G Y,Du W B,Wang C X,Wang M F. 2003. Discovery of the first example of white smoke type of exhalative rock(hydrothermal sedimentary dolostone)in Jiuxi basin and its significance. Journal of Chengdu University of Technology(Science & Technology Edition),30(1): 1-9] [28] 郑荣才,文华国,范铭涛,汪满福,吴国瑄,夏佩芬. 2006a. 酒西盆地下沟组湖相白烟型喷流岩岩石学特征. 岩石学报,22(12): 3027-3038. [Zheng R C,Wen H G,Fan M T,Wang M F,Wu G X,Xia P F. 2006a. Lithological characteristics of sublacustrine white smoke type exhalative rock of the Xiagou Formation in Jiuxi Basin. Acta Petrologica Sinica,22(12): 3027-3038] [29] 郑荣才,文华国,高红灿,柯光明. 2006b. 酒西盆地青西凹陷下沟组湖相喷流岩稀土元素地球化学特征. 矿物岩石,26(4): 41-47. [Zheng R C,Wen H G,Gao H C,Ke G M. 2006b. Characteristics of rare earth elements of lacustrine exhalative rock in the Xiagou Formation,Lower Cretaceous in Qingxi Sag,Jiuxi Basin. Journal of Mineralogy and Petrology,26(4): 41-47] [30] 朱国华,张杰,姚根顺,李平文,王鑫,余朝丰. 2014. 沉火山尘凝灰岩: 一种赋存油气资源的重要岩类: 以新疆北部中二叠统芦草沟组为例. 海相油气地质,19(1): 1-7. [Zhu G H,Zhang J,Yao G S,Li P W,Wang X,Yu C F. 2014. Sedimentary volcanic dust tuff: An important kind of rock storing hydrocarbon resources: Discussion on the lithology of Middle Permian Lucaogou oil-bearing rocks in the North of Xinjiang. Marine Origin Petroleum Geology,19(1): 1-7] [31] Al-Aasm Ihsan. 2003. Origin and characterization of hydrothermal dolomite in the Western Canada Sedimentary Basin. Journal of Geochemical Exploration: 78-79, 9-15. [32] Bonia M,Parentea G,Bechstadtb T,De Vivoc B,Iannacea A. 2000. Hydrothermal dolomites in SW Sardinia(Italy): Evidence for a widespread late-Variscan fluid flow event. Sedimentary Geology,131: 181-200. [33] Brown A C. 1993. Sediment-host of stratiform copper deposits. Geoscience Canada,19(3): 125-1415. [34] Chen D Z,Qing H R,Yang C. 2004. Multistage hydrothermal dolomites in the Middle Devonian(Givetian)carbonates from the Guilin area,South China. Sedimentology,5: 1029-1051. [35] Faure G. 1986. Principles of Isotope Geology(2nd Edition). New York: John Wiley and Sons,160-230. [36] Palmer M R,Elderfield H. 1985. Sr isotope composition of sea water over the past 75 Myr. Nature,314: 526-528. [37] Tiercelin J J,Pflumio C,Castrec M,Boulégue J,Gente P,Rolet J,Coussement C,Stetter K O,Huber R,Buku S,Mifundu W. 1993. Hydrothermal vents in Lake Tanganyika,East African,Rift system. Geology,21(6): 499-502. [王登红,张权范,译. 1994. 东非裂谷坦噶尼喀湖的热液喷口. 世界地质,13(4): 12-14] [38] Veizer J,Ala D,Azmy K B,Bruckschen P,Buhl D,Bruhn F,Carden G A F,Diener A,Ebneth S,Godderis Y,Jasper T,Korte C,Pawellek F,Podlaha O G,Strauss H. 1999. 87 Sr/ 86 Sr, δ 13 C and δ 18 O evolution of Phanerozoic seawater. Chemical Geology,161: 59-88.
