郯庐断裂带南段的重磁场特征及其地质意义     

郑祺方  郑宇舟  赵睿  匡星涛  张婉  刘英会  徐璐平  吴云  周道卿 《地学前缘》2022,29(3):292-303

由于断裂两侧的磁性、密度的纵横向差异在重力、磁力异常上有所表现,因此所获得的重力、磁力数据为深入研究关键的地质课题提供了科学基础,如郯庐断裂带的基底性质、断裂形成特征和岩浆岩分布。利用最新的高精度航空重力和磁力数据以及地面重力数据,绘制了郯庐断裂带地区的1∶50 000重力和磁力异常图,并结合区域地质数据分析了重力和磁力异常特征。分析结果认为:存在连体的郯庐—大别古老构造带,郯庐断裂带南段是元古宙和燕山中期岩浆活动的复合反映带;郯庐断裂带为中元古—新元古代时期南华北陆块与下扬子陆块的界限;磁力、重力异常图对比说明,合肥盆地范围由老到新向东扩展。  相似文献   

合肥盆地安参1井同位素年代地层学研究   总被引：4，自引：0，他引：4  

方小东  朱光  徐春华  刘国生 《安徽地质》2005,15(4):246-250

安参1井是胜利油田取得合肥盆地油气勘探权之后钻探的第一口区域探井,但因化石极少,更没有发现具有划时代意义的化石,因而选择K-Ar法、40^Ar／^39Ar法、砂岩中石英电子自旋共振（ESB）及大理岩的铅一铅等时线法测年等同位素年代学法进行安参1井的地层划分,从而准确地确定了安参1井的地层时代及划分界限,为合肥盆地基础地质的深入研究奠定了坚实的基础。  相似文献   

基于空间句法和LBS大数据的合肥市人口分布空间格局研究     

张晓瑞  华茜  程志刚 《地理科学》2018,38(11):1809-1816

针对目前城市人口分布研究现状,在传统的空间句法模型基础上,将LBS大数据技术有机引入到城市人口分布研究中,从而构建了理论分布和实际分布有机结合的城市人口分布研究新思路。合肥市中心城区的案例研究显示：空间句法模型与LBS大数据分析所得到的人口集聚区域在空间上并不完全一致;根据空间句法模型和LBS大数据分析结果的综合对比,合肥市中心城区被划分为高密度、中密度和低密度3类人口分区,同时提出了不同密度分区的人口分布发展建议。研究表明,LBS大数据的适时、动态特点能弥补传统数据的不足,其与空间句法模型有机结合将能为城市人口分布研究提供更加精确高效的工具与方法。  相似文献   

合肥经济圈空间关联时空演进研究   总被引：1，自引：1，他引：0  

朱道才  孙家敏  陆林 《地理科学》2017,37(5):738-747

从城市产业角度出发,依据2009~2014年的相关数据,采用城市流和ESDA模型对合肥经济圈空间关联进行分析,揭示空间相互作用的时间演变过程和空间分布。结果表明：① 经济圈形成了较稳定的中心-外围格局,空间结构呈现以合肥为中心圈层式向外辐射状,淮南和六安有望成为次增长极。② 经济圈产业外向功能性不强且出现异化,城市流倾向度呈现明显的等级异质性和不均衡性。③ 经济圈产业外向发展存在显著的空间依赖性,空间自相关符合距离衰减规律。④ 经济圈区域不平衡态势明显,空间关联的时空分异特征明显。应推进区域一体化,加快区域协调发展。  相似文献   

HEFEI BASIN IN EARLY CRETACEOUS -CHARACTERIZATION AND ANALYSIS OF PETROLEUM POTENTIAL     

YIWanxia ZHAOZongju LIXuetian SHENJinlong ZHOUJingao 《大地构造与成矿学(英文版)》2003,27(1):130-144

Comprehensive analyses were made based on seismic prospecting data, electrical prospecting data and basin simulation data as well as regional geological data and thorough discussions were conducted about the complicated structures, features and evolution of Hefei Basin in Early Cretaceous in this study, and it was derived that that Hefei Basin was a composite basin formed during the transformation of the stress field from compressive toward tensile in Early Cretaceous. In other words, this basin was a foreland basin of gliding-thrust type, which is mainly controlled by the Dabie orogenic belt in the south side in the early to middle period of Early Cretaceous, while being a strike-slip basin of pull-apart type, which is mainly controlled by the activity of Tanlu fracture in the east side in the middle to late period of Early Cretaceous. Moreover, the potential Lower Cretaceous oil and gas system in the pull-apart basin and the vista for its prospecting were explored in this study. Tectonism of the Tanlu fracture was further discussed based on the results of characterization of the basin, and it was pointed out that this is beneficial and instructive to the oil and gas prospecting in Hefei Basin.  相似文献   

合肥盆地周缘石炭—二叠系碎屑岩储层特征及盆内储集性预测     

王鑫 《海相油气地质》1997,2(2):39-44

合肥盆地周缘中石炭系－二叠系碎屑岩的成分成熟度和结构２成熟度较高，成岩后生作用强烈，特别是强的机械压实作用和成岩自生矿物的多期胶结作用，使其孔隙结构和储集物性变差。盆地南缘石炭系碎屑岩成岩强度更强，孔隙结构更差。碎屑岩的孔隙类型多样，以构造裂隙和次生孔隙为主，且裂隙和次生孔隙的形成呈多期性，先期形成的次生孔隙不同程度地被后期的自生矿物充填。  相似文献   

Mesozoic fill-sequences in Hefei Basin: Implication for Dabie Orogenesis, central China   总被引：2，自引：0，他引：2  

LI Zhong  SUN Shu  LI Renwei  JIANG Maosheng 《中国科学D辑(英文版)》2001,44(1):52-63

A research on the Mesozoic fill-sequences of Hefei basin, located at the north foot of Dabie Mountains, shows two-phase evolution. The first phase, early- to mid-/late-Jurassic, is characterized by terrestrial clastic deposits, with four times of reverse-grading units at least, and forms greatly thick molass reconstruction in the mid-/late-phase, which reflects gradually strong thrusting-orogenesis in the north Dabie and flexural depression in the north foreland of Dabie Mountains. The second phase, late-Jurassic to Cretaceous, includes two-episode rifting processes. The first episode (J₃) shows calc-alkalic and alkali volcanic rocks interstratified pyroclastic rocks, which may reflect upwelling igneous magma from mantle-source due to the Yangtze continent slab breakoff induced by deep subduction process. A suite of lacustrine, fluvial and piemount facies, about 3000 –3500 m in thickness, develops in the second episode (J₃-K₁), which reflects regional extensional setting and intense elevator diversity of mountain-basin in the study area. This research renews and deepens cognition for the Mesozoic Dabie orogenesis  相似文献   

The Dabie Orogen as the early Jurassic sedimentary provenance: Constraints from the detrital zircon SHRIMP U-Pb dating     

LI Renwei  WAN Yusheng  CHENG Zhenyu  ZHOU Jianxiong  XU Yunhua  LI Zhong & JIANG Maosheng Institute of Geology  Geophysics  Chinese Academy of Sciences  Beijing  China  Institute of Geology  Chinese Academy of Geological Sciences  Beijing  China  Institute of Mineral Resources  Chinese Academy of Geological Sciences  Beijing  China 《中国科学D辑(英文版)》2005,48(2):145-155

The SHRIMP U-Pb ages of detrital zircon from the oldest Mesozoic strata, the Fanghushan Fomation, in the Hefei Basin range from 200 Ma to ca. 2500 Ma, which indicates that the Dabie Orogen as the early Jurassic sedimentary provenance was complex. The composition of the Dabie Orogen includes: the Triassic high pressure-ultrahigh pressure metamorphic rocks, of which the detrital zircon ages are from 234 Ma to 200 Ma; the rocks possibly related to the Qinling and Erlangping Groups representing the southern margin of the Sino-Korean craton in the Qinling and Dabie area, of which the detrital zircon has an age of 481-378 Ma; the Neo-proterozoic rocks originated from the Yangtze croton, of which the detrital zircon ages are 799-721 Ma old; and the rocks with the detrital zircon ages of ca. 2000 Ma and ca. 2500 Ma, which could be the old basement of the Yangtze craton.  相似文献   

合肥盆地和郯庐断裂带南段深部地球物理特征研究   总被引：16，自引：1，他引：16       下载免费PDF全文

李云平  吴时国  韩文功  张岳桥 《地球物理学报》2006,49(1):115-122

根据重、磁、电、震资料联合反演和综合解释，研究了合肥盆地和郯庐断裂带南段深部结构特征和构造样式. 合肥盆地呈现深部印支面以下为逆冲断层、以上为张性正断层的构造样式，盆地构造反转发生在晚侏罗世，早白垩世是裂陷盆地形成的主要时期，早白垩世晚期合肥盆地发生构造反转，发育冲逆、冲推覆构造. 郯庐断裂带南段表现为“上正下逆”的构造变形样式和正花状构造特征，并经历了复杂的挤压走滑-引张正断层变形过程.  相似文献   

安徽定远县八里张石膏矿区含盐岩系沉积特征与矿床成因探讨     

刘青  朱琨 《华北地质》2007,30(2):115-120

八里张石膏矿位于合肥盆地北缘,赋存于古近系定远组含盐岩系。古近系定远组是安徽重要的陆相含盐建造。文中结合矿区地质背景,着重从沉积相特征的角度,通过对定远组含盐岩系的岩相特征、沉积规律、形成条件以及河湖相沉积特征规律的分析,对矿区的矿床成因也做了初步分析。认为矿区含盐岩系由河湖相沉积组成,属陆相盐湖沉积,同时在盐湖的形成过程中,盐盆受断裂控制。  相似文献