陕南东秦岭泥盆纪前陆盆地的地球化学鉴定

高长林; 吉让寿; 秦德余; 殷勇

doi:10.11781/sysydz199104325

陕南东秦岭泥盆纪前陆盆地的地球化学鉴定

doi: 10.11781/sysydz199104325

地质矿产部石油地质中心实验室, 无锡

计量
- 文章访问数: 720
- HTML全文浏览量: 113
- PDF下载量: 260
- 被引次数: 0
出版历程
- 收稿日期: 1989-11-15
- 刊出日期: 1991-10-25

GEOCHEMICAL IDENTIFICATION OF THE DEVONIAN FORELAND BASIN IN THE EASTERN QINLING, THE SOUTHERN SHAANXI

Central Laboratory of Petroleum Geology, MGMR

摘要

摘要: 本文综合运用地质和地球化学的理论和方法探讨东秦岭地区泥盆纪沉积岩形成的大地构造环境,初次提出它产于东秦岭古缝合带前缘的边缘前陆盆地.

Abstract: The Devonian System of the eastern Qinling,the Southern Shaanxi is distributed in front of the eastern Qinling Suture and developed on the ancient passive margin of the eastern Qinling.This Devonian System can be divided into three belts of north,central and south belts respectively bounded by the Zhengan-Banyanzheng and the Shanyang-Zhashui faults.According to the geochemical and geological studies,it concludes that the Devonian system of the eastern Qinling had developed under the tectonic settings of peripheral foreland basin and the foreland basin can be characterized by the followings:1.The migration of the depocenter of the foreland basin,the depocenter was located ar the flank of the Yangtze Craton during the early Devonian and thereafter,it migrated gradually to the Danfeng-Shangnan obducting slab.2.The contact relationship between the Devonian sequences and the underlying sequence transformed successively from conformity,pseudoc-onformity to unconformity from the Yangtze Craton to the Danfeng-Shangnan obducting slab.3.The sedimentary facies of the system can be classified into lagoon and shore facies for the south Devonian belt,neritic shelf facies for the central belt and neriticfacies for the north belt respectively.4.The detrital sediments of the north belt derived from the ancient suture belt of the Qinling and the northward high land,and those of the central and south belts from the north passive continental margin of the Yangtze Craton.

HTML全文

参考文献(12)

[1]	杜定汉等,1985,陕西的泥盆系,西安交通大学出版社.
[2]	于在平、孙勇、张国伟,1988,商丹地区秦岭缝合带中弧前沉积楔形体初探、秦岭造山带的形成及其演化,西北大学出版社.
[3]	张国伟、周鼎武、郭安林,1988,北秦岭商丹地区“秦岭群”的构成及其变形变质特征,《秦岭造山带的形成及其演化》论文集,西北大学出版社.
[4]	高长林、秦德余、吉让寿、殷勇,1990,东秦岭古洋壳的地球化学鉴定,石油实验地质,第12卷,第1期.
[5]	Keith,Crook,A.W.,1982,岩石成因与大地构造:复理层粗砂碎屑岩(杂砂岩)成分变化的意义,《板块构造与沉积作用》论文集,地质出版社.
[6]	Bhatia.M.8.,1983,Plate tectonic and geoche mical composition of sandstones,J.Geol,91.611.
[7]	Roser.B.P.aad Korsch, R.J.1986, Determination of tectonic setting of sandstone-mudstone suites using SiO₂,content and K₂O/Na,sub>2O ratio,J.Geol.,94,635-650.
[8]	Dickinson, W.R.and Suczek,C.A.,1979,Plate tectonics and sandstone compositions.American Association of Petroleum Geologists Bulletin. V.63,p.2184-2183.
[9]	Lash,G.G.,1988,Along-strike variations in fore land basin evolution: Possible evidence for continental collision along an irregular margin,Basin Research,(1988)1.71-83.
[10]	PhiliP,A.A.,Homewood.P.and Williams.G.D.,1986, Fore land basins;Auintroduction.In:Fore land Basins,p.3-12.edited by Allen,P.A.and Homewood,P.,Blackwell Scientific Publications.
[11]	Lash.G.G.,1987,GeodYnamic evolution of the early Paleozoic central Appalachian fore land basia.In:Sedimentary basins and basin forming mechanisms,(Ed.by C.Beaumont and A.Tankard),Can.Soc.Petrol.Geol.Mem.12,p.413-423, Calgary,Alberta,Canada.
[12]	Schwab,F.L.,1986,Sedimentary ‘signature’of foreland basin assemblages:real or counterfeit? In:Fore la ad basins,P.395-410,edited by Allen,P.A.and Homewood.P.,Black well scientific publications.