苏北盆地高邮凹陷马家嘴地区古近系戴南组物源分析  

Provenance Analysis of Dainan Formation (Paleogene) of Majiazui in Gaoyou Sag,Subei Basin

作　　者：周健[1] 林春明[1] 李艳丽[1] 姚玉来[1] 张霞[1] 张志萍[2,1] 高丽坤[1] 

机构地区：[1]内生金属矿床成矿机制研究国家重点实验室南京大学地球科学与工程学院,南京210093 [2]中国石油化工股份有限公司华东分公司规划设计研究院,南京210036

出　　处：《沉积学报》2010年第6期1117-1128,共12页Acta Sedimentologica Sinica

摘　　要：综合运用碎屑岩类分析法、重矿物法、沉积法三类物源分析方法对苏北盆地高邮凹陷马家嘴地区戴南组的物源进行了分析。马家嘴地区母岩岩性以火成岩为主,其次为变质岩和沉积岩,其中中酸性火成岩的分布范围要比基性火成岩分布范围广,变质岩以中—低级变质岩为主,深成岩较少。对研究区内各层段砂岩类型、岩屑类型及含量变化、砂岩百分含量、地层厚度、沉积相展布、重矿物稳定系数、重矿物组合、ZTR指数和重矿物指数等资料的研究结果表明,戴南组沉积时期马家嘴地区各个区块具有不同的物源方向,马8区块沉积物主要来自菱塘桥低凸起方向,部分来自通扬隆起;马31区块沉积物来自菱塘桥低凸起方向,古河流发生迁移;马33区块沉积物来自通扬隆起。Synthesizing methods of clastic constituments,heavy mineral,and sedimentation,we analyzed Dainan Formation provenance of Majiazui in Gaoyou Sag,Subei Basin.Igneous rock is the main lithology of Majiazui source rocks,followed successively by metamorphics and sedimentary rock;distribution range of neutral and acidic igneous rocks is wider than that of basic igneous rock;and medium to low is the dominating grade of metamorphics;while plutonite here is rare.According to sandstone types,types and contents of clastic constituents,percentage of sandstones,thickness of layers,distribution of sedimentary facies,stability factors of heavy minerals,heavy mineral combination,ZTR index and index of heavy mineral,we believe that during the depositional period of Dainan Formation,provenance differed between different blocks.Sediments of Ma 8 block mainly from Lingtang low bulge and partly came from Tongyang uplift;that of Ma 31 block was only from Lingtang low bulge and paleo-rivers transferred;while sediments of Ma 33 block came from Tongyang uplift.

关 键 词：苏北盆地 高邮凹陷 戴南组 物源分析 

分 类 号：P512.2[天文地球—地质学] P534.5