安徽巢湖地区石炭纪-早二叠世碳酸盐岩微相与沉积环境
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摘要
安徽巢湖凤凰山剖面出露石炭系金陵组(C1j)、和州组(C1h)、黄龙组(C2h)、船山组(C2c)以及下二叠统栖霞组下部臭灰岩段(P1q)等5个含碳酸盐岩地层。本文在野外剖面实测的基础上,对这些碳酸盐岩进行了岩相与微相分析。通过对碳酸盐岩显微薄片的观察分析,共识别出14个微相,分属于干旱近海岸蒸发台地(潮坪)、局限海台地、开阔台地内部浅滩、开阔海台地等4种沉积环境。本文研究结果表明,石炭纪-早二叠世期间,巢湖地区主要为浅海碳酸盐台地环境,期间发生了3次比较大规模的海侵-海退旋回,并间隔有若干次小规模的海平面升降。
In the light of field investigation in recent years,the present paper gives a detailed description of the carbonate strata in the Fenghuanshan section in Chaohu,Anhui,including the Carboniferous Jinling Formation( C1j),Hezhou Formation( C1h),Huanglong Formation( C2h),Chuanshan( C2c) and stinkstone member in the lowermost part of the Lower Permian Qixia Formation( P1q). Fourteen sedimentary microfacies have been distinguished for the carbonate rocks on the basis of thin-section examination of the carbonate rocks,and are involved into the following sedimentary environments: arid coastal evaporate platform( tidal flat),restricted carbonate platform,intraplatformal shoal and open carbonate platform. The results of research in this study show that the Chaohu region in Anhui was once occupied by the shallow marine carbonate platform during the Carboniferous- Early Permian,and went through three large-scale transgression-regression cycles with a number of small-scale sea-level fluctuations.
In the light of field investigation in recent years,the present paper gives a detailed description of the carbonate strata in the Fenghuanshan section in Chaohu,Anhui,including the Carboniferous Jinling Formation( C1j),Hezhou Formation( C1h),Huanglong Formation( C2h),Chuanshan( C2c) and stinkstone member in the lowermost part of the Lower Permian Qixia Formation( P1q). Fourteen sedimentary microfacies have been distinguished for the carbonate rocks on the basis of thin-section examination of the carbonate rocks,and are involved into the following sedimentary environments: arid coastal evaporate platform( tidal flat),restricted carbonate platform,intraplatformal shoal and open carbonate platform. The results of research in this study show that the Chaohu region in Anhui was once occupied by the shallow marine carbonate platform during the Carboniferous- Early Permian,and went through three large-scale transgression-regression cycles with a number of small-scale sea-level fluctuations.
引文
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[16]张遴信,周建平.中国晚石炭世达拉阶标准剖面的蜓[J].古生物学报,2004,43(4):515-529.
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[19]曾允孚.沉积岩石学[M].北京:地质出版社,1984.
[20]韩宗珠,衣伟虹,李安龙等.巢北地区黄龙组岩石学、元素地球化学特征及意义[J].中国海洋大学学报(自然科学版),2010,40(9):123-127.
[21]韩宗珠,衣伟虹,李安龙等.巢北地区船山组岩石地球化学及其沉积特征[J].中国海洋大学学报(自然科学版),2011,41(S1):312-316.
[22]侯明金,齐敦伦,金义祥.安徽巢湖凤凰山石炭纪岩石特征及沉积环境分析[J].安徽地质,1998,(3):32-39.
[2]SADOONI F N.Stratigraphic sequence,microfacies,and petroleum prospects of the Yamama Formation,Lower Cretaceous,southern Iraq[J].AAPG Bulletin,77(11):1993,1971-1988.
[3]GEEL T.Recognition of stratigraphic sequences in carbonate platform and slope deposits:empirical models based on microfacies analysis of Palaeogene deposits in southeastern Spain[J].Palaeogeography,Palaeoclimatology,Palaeoecology,2000,155(3):211-238.
[4]林春明,黄志诚,刘家润等.安徽巢湖凤凰山剖面石炭系微相和层序地层特征[J].岩石学报,2002,18(3):424-433.
[5]陈松,曾勇,王茵等.安徽巢北地区下石炭统岩石微相特征[J].中国煤田地质,2007,19(3):13-16.
[6]张瑛,陈宏明,魏乃颐等.安徽巢湖地区下石炭统沉积特征[J].中国地质科学院南京地质矿产研究所所刊,1983,2:1-26.
[7]贾伟,丁卓,李壮福等.安徽巢北早石炭世和州组沉积特征及旋回地层[J].中国煤炭地质,2011,23(5):5-7+12.
[8]张瑛,李耀西,陈宏明.中国东南部石炭纪沉积地质及矿产[J].火山地质与矿产,1995,(4):74.
[9]张国栋,朱静昌,王益友.对下扬子区五通组沉积的新认识[J].中国科学(B辑化学生命科学地学),1991,(4):416-423.
[10]夏广胜,徐家聪.安徽巢湖地区早石炭世地层[J].地层学杂志,1980,(2):87-95.
[11]夏军,徐家聪.巢湖地区石炭纪地层格架[J].安徽地质,1998,(3):40-46.
[12]盛金章.辽东太子河流域本溪统的蜓科[J].中国古生物志新乙种第7号,1958,57.
[13]贵州地层古生物工作队.西南地区古生物图册贵州分册(二)石炭纪-第四纪[M].贵阳:地质出版社,1978.638.
[14]地质部南京地质矿产研究所.华东地区古生物图册(二)晚古生代分册[M].北京:地质出版社,1982.495.
[15]安徽省地质局区域地质调查队.安徽蜓类化石[M].合肥:安徽科学技术出版社,1982.145.
[16]张遴信,周建平.中国晚石炭世达拉阶标准剖面的蜓[J].古生物学报,2004,43(4):515-529.
[17]包洪平,杨承运.碳酸盐岩微相分析及其在岩相古地理研究中的意义[J].岩相古地理,1999,19(6):59-64.
[18]冯增昭,何幼斌,吴胜和.中下扬子地区二叠纪岩相古地理[J].沉积学报,1993,11(3):13-24.
[19]曾允孚.沉积岩石学[M].北京:地质出版社,1984.
[20]韩宗珠,衣伟虹,李安龙等.巢北地区黄龙组岩石学、元素地球化学特征及意义[J].中国海洋大学学报(自然科学版),2010,40(9):123-127.
[21]韩宗珠,衣伟虹,李安龙等.巢北地区船山组岩石地球化学及其沉积特征[J].中国海洋大学学报(自然科学版),2011,41(S1):312-316.
[22]侯明金,齐敦伦,金义祥.安徽巢湖凤凰山石炭纪岩石特征及沉积环境分析[J].安徽地质,1998,(3):32-39.
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