Lithofacies palaeogeography of the Qixia Age of Permian in western Hubei-northwestern Hunan Provinces
Wei Hengye1,2, Chen Daizhao1
1 Key Laboratory of Petroleum Resources Research，Institute of Geology and Geophysics， Chinese Academy of Sciences，Beijing100029 2 College of Earth Sciences，East China Institute of Technology，Nanchang 330013，Jiangxi
Abstract：Detailed stratigraphic and depositional facies analyses for the Qixia to the Lower Maokou Formations from several sections in western Hubei-northwestern Hunan Provinces indicate an intra-craton carbonate ramp environment，including inner，middle and outer ramps，and basinal facies.The inner ramp facies consists of thick-bedded to massive bioclastic limestone，characterized by bioclastic grains of green algae and benthic foraminifera and lack of high-energy bioclastic shoals.The middle ramp facies consists of medium- to thick-bedded limestone bearing bioclasts and thick-bedded lime mudstone.This facies is characterized by skeletal grains of crinoids，bryozoans and small foraminiferas，but is lack of the hummocky cross-stratification.The outer ramp facies consists of marlstone interbedded with thin-bedded lime mudstone bearing bioclastic grains of thin-shelled brachiopods.Basinal facies is characterized by dark-grey marlstone intercalated with black calcareous shales.These features suggest a low energy protected carbonate ramp(or shelf)environment.Three third-order sequences(S1，S2 and S3)were identified in the Qixia and Lower Maokou Formations，each spanning about 2 Ma.These sequences are dominantly composed of the lower transgressive and upper highstand systems tracts.The basal sequence S1 was deposited during the initial transgression of Qixia Age，during which the carbonate ramp was established，developing intrashelf basin in the western Hubei area.Then an overall mild shallow carbonate ramp(or shelf)environment predominated over as the intrashelf basin was filled up during S2 deposition.Sequence S3 was deposited during the largest-scale transgression in the Late Paleozoic，resulting in an apparent deepening in water depth.The deep outer ramp was then established once again and expanded in a mushroom-shaped area in Sangzhi-Changyang-Jingzhou-Changde area.
Wei Hengye,Chen Daizhao. Lithofacies palaeogeography of the Qixia Age of Permian in western Hubei-northwestern Hunan Provinces[J]. JOPC, 2011, 13(5): 551-562.
陈洪德，覃建雄，王成善，等.1999.中国南方二叠纪层序岩相古地理特征及演化［J］.沉积学报，17（4）:510-521. 邓红婴，寿建峰.1999.中国南方二叠系层序特征［J］.海相油气地质，4（2）:9-15. 冯增昭，杨玉卿，金振奎，等.1997.中国南方二叠纪岩相古地理［M］.北京: 石油大学出版社，60-62. 胡书毅，田海芹.1999.扬子地区二叠系油气地质条件综合研究［J］.现代地质，13（2）:162-168. 湖北省地质矿产局.1990.湖北省区域地质志［M］.北京：地质出版社，155-171. 金玉玕，王向东，尚庆华，等.1999.中国二叠纪年代地层划分和对比［J］.地质学报，73:97-108. 李祥辉，王成善，陈洪德，等.1999.中国南方二叠纪层序地层时空格架及充填特征［J］.沉积学报，17（4）:522-528. 马力，陈焕疆，甘克文，等.2004.中国南方大地构造和海相油气地质［M］.北京：地质出版社，75-77. 牟传龙，丘东洲，王立全，等.1997.湘鄂赣二叠纪岩相古地理研究［J］.岩相古地理，17(6):1-21. 田望学，张汉金，李雄伟，等.2007.鄂西南二叠系层序地层与盆地演化［J］.资源环境与工程，21: 95-100. 王立亭，陆彦邦，赵时久，等.1994.中国南方二叠纪岩相古地理与成矿作用［M］.北京：地质出版社，60-61. 王正允.1998.湖北兴山大峡口二叠系沉积相及层序地层特征［J］.江汉石油学院学报，20: 2-7. 韦恒叶，陈代钊，遇昊，等.2011.鄂西地区中二叠统栖霞组下部烃源岩形成机理［J］.地质科学，46(1):68-82. 颜佳新，方念乔.1994.湖北省栖霞组沉积环境、沉积旋回及层序地层划分［J］.地球科学——中国地质大学学报，19(5):620-627. 杨振强，陈善庆，林金明，等.1992.“江南古陆”两侧早二叠世海泡石的形成环境及成矿预测［C］.见：刘宝珺，曾允孚（主编）.岩相古地理文集 7.北京：地质出版社，1-50. 赵时久，张开明，陈家怀，等.1992.中南地区二叠纪岩相古地理及沉积矿产远景预测［C］.见：刘宝珺，曾允孚（主编）.岩相古地理文集7.北京：地质出版社，51-98. 周小进.2009.中国南方二叠纪构造—层序岩相古地理［D］.中南大学博士论文. 周雁，陈洪德，王成善，等.2005.中扬子区中二叠统层序地层研究［J］.地层学杂志，29（2）: 270-280. Burchette T P，Wright V P.1992.Carbonate ramp depositional systems［J］.Sedimentary Geology，79: 3-57. Flügel E.2004.Microfacies of Carbonate Rocks: Analysis，Interpretation and Application［M］.New York:Berlin Heidelberg，427-430. Kirkland B L，Moore C H J，Diekson J A D.1993.Well preserved，aragonitic phylloid algae(Eugonophyllum，Udoteaceae)from the Pennsylvanian Holder Formation，Sacramento Mountains，New Mexico［J］.Palaios，8: 111-120. Tucker M E，Calvet F，Hunt D.1993.Sequence stratigraphy of carbonate ramps: Systems tracts，models and application to the Muschelkalk carbonate platforms of eastern Spain［C］.In: Posamentier H W，et al(eds).Sequence Stratigraphy and Facies Associations.Spec.Publs Int.Ass.Sediment，18: 397-415. Tucker M E.2003.Sedimentary Rocks in the Field［M］.Chichester: Wiley，194-205. Van Wagoner J C，Mitchum J R M，Campion K M， et al.1990.Siliciclastic sequence stratigraphy in well logs，core，and outcrops: Concepts for high-resolution correlation of time and facies［J］.American Abstracts of Petroleum Geologists Methods in Exploration Series，7: 1-55. Wang Y，Jin Y.2000.Permian palaeogeographic evolution of the Jiangnan Basin，South China［J］.Palaeogeography，Palaeoclimatology，Palaeoecology，160: 35-44.
