黔西水城晚二叠世长兴期钙藻和有孔虫及其古环境意义  

Changhsingian(Late Permian)calcareous algae and foraminifers from Shuicheng,western Guizhou,South China and their paleoenvironmental significance

作　　者：党志英 沈玉林[1,2] 陈飞扬 张立军[3] 杨天洋 金军 赵勇[5] DANG Zhi-ying;SHEN Yu-lin;CHEN Fei-yang;ZHANG Li-jun;YANG Tian-yang;JIN Jun;ZHAO Yong(Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process,Ministry of Education,Xuzhou 221008,Jiangsu,China;School of Resources and Geosciences,China University of Mining and Technology,Xuzhou 221008,Jiangsu,China;School of Resources and Environment,Henan International Joint Laboratory of Biogenic Traces and Sedimentary Minerals,Henan Polytechnic University,Jiaozuo 454003,Henan,China;Guizhou Engineering Technology Research Center for Coalbed Methane and Shale Gas,Guiyang 550081,China;Sinopec Xinjiang Xinchun Petroleum Development Co.,Ltd,Dongying 257000,Shandong,China)

机构地区：[1]煤层气资源与成藏过程教育部重点实验室,江苏徐州221008 [2]中国矿业大学,资源与地球科学学院,江苏徐州221008 [3]河南理工大学,资源环境学院,河南省生物遗迹与成矿过程国际联合实验室,河南焦作454003 [4]贵州省煤层气页岩气工程技术研究中心,贵阳550081 [5]中国石化新疆新春石油开发有限责任公司,山东东营257000

出　　处：《古生物学报》2023年第3期376-389,共14页Acta Palaeontologica Sinica

基　　金：国家自然科学基金(42172186,41872168)联合资助。

摘　　要：在黔西水城地区的K576井长兴组共鉴定钙藻3属3种,包括Gymnocodium bellerophontis、Permocalculus sp.和Tauridiumkurdistanensis;有孔虫8属10种,其中(虫筳)类2属2种,有孔虫动物群主要由Reichelinasp.indet.、Nankinella sp.、Pachyphloia schwageri、Pachyphloia sp.、Geinitzina sp.、Nestellorella sp. indet.、Howchinella sp.、Hemigordius aff. saranensis、Hemigordius sp.和Midiella sp. indet.组成。将本井按照生物特征分为有孔虫-钙藻-介形虫组合、有孔虫-腕足类-介形虫组合、介形虫-双壳类-腹足类组合、有孔虫-钙藻-双壳类组合、有孔虫-腕足类-介形虫组合、有孔虫-钙藻-双壳类组合和介形虫组合等7个组合。按照层序地层划分、垂向沉积序列特征和测井资料的分析,有孔虫-钙藻-介形虫组合(SQ3-3)和有孔虫-腕足类-介形虫组合(SQ3-4)时期地层为三角洲前缘环境。介形虫-双壳类-腹足类组合(SQ4-1)时期地层为混合坪环境。有孔虫-钙藻-双壳类组合(SQ4-2)、有孔虫-腕足类-介形虫组合(SQ4-3)和有孔虫-钙藻-双壳类组合(SQ4-3)时期地层为潟湖环境,介形虫化石组合(SQ4-3)时期地层为砂坪环境。整体上黔西水城地区长兴期发育三角洲和障壁-潟湖的沉积体系,为一个低能、平静和温暖的近岸浅海环境。此外,在上述化石组合分析中发现,当在潟湖环境同时出现有孔虫和钙藻时,生物多样性增加明显。Three species in three genera of calcareous algae,including Gymnocodium bellerophontis,Permocalculus sp.,and Tauridium kurdistanensis and ten species in eight genera of foraminifers,including two species in two genera of fusulinids,are identified from Well K576 near Shuicheng,western Guizhou,South China.The foraminifers mainly consist of Reichelina sp.indet.,Nankinella sp.,Pachyphloia schwageri,Pachyphloia sp.,Geinitzina sp.,Nestellorella sp.indet.,Howchinella sp.,Hemigordius aff.saranensis,Hemigordius sp.,and Midiella sp.indet.The fossil fauna is divided into seven assemblages:Foraminifer-Calcareous alga-Ostracod,Foraminifer-Brachiopod-Ostracod,Ostracod-Bivalve-Gastropod,Foraminifer-Calcareous alga-Bivalve,Foraminifer-Brachiopod-Ostracod,Foraminifer-Calcareous alga-Bivalve,and Ostracod assemblages.Based on sequence stratigraphy of the study area,characteristics of the vertical sedimentary sequence,and analysis of log data,the palaoenvironment of the deposits that yield the Foraminifer-Calcareous alga-Ostracod assemblage(SQ3-3)and Foraminifer-Brachiopod-Ostracod assemblage(SQ3-4)is a delta front.The strata that yields the Ostracod-Bivalve-Gastropod assemblage(SQ4-1)was deposited on a tidal flat.The paleoenvironment of the Foraminifer-Calcareous alga-Bivalve(SQ4-2),the Foraminifer-Brachiopod-Ostracod(SQ4-3),and the Foraminifer-Calcareous alga-Bivalve(SQ4-3)assemblages is a lagoon.The strata that yields the Ostracoda assemblage(SQ4-3)was deposited on a sand flat.A low-energy,calm,and warm nearshore delta and barrier lagoon depositional systems were generally developed during the Changhsingian in Shuicheng area of western Guizhou.In addition,analysis of the fossil assemblages indicates that biodiversity increases significantly when both foraminifers and calcareous algae are present in the lagoon environment.

关 键 词：钙藻 有孔虫 沉积环境 长兴期 黔西地区 

分 类 号：Q915[天文地球—古生物学与地层学]