Analyses of Petrology and Sedimentary Environment on Late-Cambrian Carbonate Rocks of the Xiyangshan Formation in NW Jiangxi, China
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摘要: 主要通过对修水县港口地区野外 1:5万地质填图而实测到的三条剖面 (沙墩上、岩背、洞下 )的详细研究,阐明西阳山组的岩石学及地层分布特征,进而分析得出本区西阳山组为深水碳酸盐台地斜坡环境沉积。鉴别出三个主要沉积相:环台地再沉积碎屑裙相、碳酸盐浊流沉积相和半远洋泥质沉积相。并在此基础上,又对本区西阳山组沉积过程的动态变化以及灰岩透镜体、扁豆体的成因作了初步分析,认为灰岩透镜体的成因是多源的,往往是多种作用共同作用的结果。另外,还发现西阳山组碳酸盐地层沉积旋回具有自相似和多重分形的特征。Abstract: Based on studies of three geological transections (Shadunshang, Yanbei and Dongxia) from 1:50, 000 field mapp ing at Gangkou area, Jianxi, this paper addresses the petrological features and facies distribution of late-Cambrian carbonate rocks of Xiyangshan formation. Three main depositional facies of carbonate-ramp origin are identified, which are circum-platform redepositional clastic apron facies, carbonate turbidite facies and hemi-pelagic muddy facies. The dynamic variations of the depositional processes and the causes of carbonate lens are further analyzed.Carbonate lens observed in Xiyangshan formation are believed to be of multiple causes and may result from the combined action of several different mechanisms. In addition, cyclic carbonate sequences in this area are found to have self-similar and multifractal behaviors.
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[1] 1 蔡雄飞,熊兴武,张雄华. 赣西北港口地区上寒武统的重力流沉积特征及其构造古地理意义[J].江西地质,1995,(01):28-36.
2 蔡雄飞,张雄华,章泽军. 基本层序和相分析是区调中组建立的基础[J].地层学杂志,1999,(03):206-210.
3 蔡雄飞. 深水沉积环境条带状层理的分类特征及意义[J].沉积与特提斯地质,2001,(04):84-88.
4 《中国地层典》编辑委员会. 中国地层典-寒武系[M].北京:地质出版社,1999.
5 关士聪. 中国海相沉积及古地理演变[M].北京:科学出版社,1984.
6 王鸿祯. 中国古地理图集(及说明书)[M].北京:中国地图出版社,1985.
7 章泽军,印纯清,曾佐勋. 赣西北地区修水县联测图组1︰5万区调主要进展与体会[J].江西地质,1997,(02): 74-80.
8 DottRHJr. Dynamics of subaqueous gravity depositional processes[J].AAPG BULLETIN,1963.104-128.
9 WanlessHR. Limestone response to stress: Pressure solution and dolomitization[J].Journal of Sedimentary Petrology,1979.437-462.
10 James NP. Megablocks of calcified algae in the Cow Head Breccia,western Newfoundland: vestiges of a lower Paleozoic continental margin[J].Geological Society of America Bulletin,1981.799-811.
11 James NP. Shallowing-upward sequences in carbonates[A].Second Ed,1984.214-228.
12 于炳松. 碳酸盐岩层序形成的计算机模拟[J].沉积学报,1996,(Z1):18-24.
13 朱同兴,蒲心纯. 扬子台地西缘二叠纪深水碳酸盐沉积作用及其环境意义[J].特提斯地质,1994.88-103.
14 TuckerME,Write V P,Dickson J A D. Carbonate Sedimentology[M].London: Blackwell Scientific Publications,1990.
15 ReadingHG. Sedimentary Environments and Facies (third edition):[J]. Springer-Verlag,1996.
16 TuckerME. Sedimentary Petrology 2nd edition[M].Blackwell Scientific Publications,1991. -

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