本文選題：相山火山盆地　切入點(diǎn)：褶皺　出處：《東華理工大學(xué)》2015年碩士論文

【摘要】：江西相山早白堊世火山盆地位于近東西向贛-杭構(gòu)造火山巖型鈾成礦帶與南北向大王山-于山花崗巖型鈾成礦帶的交匯處,發(fā)育于青白口系淺變質(zhì)巖組成的雪峰-加里東期北東東向潭港-相山復(fù)式背斜的核部。本論文依托中國(guó)地質(zhì)調(diào)查局“相山火山盆地三維地質(zhì)調(diào)查”項(xiàng)目,在詳細(xì)收集分析相山火山盆地地層、構(gòu)造等資料的基礎(chǔ)上,通過(guò)野外精細(xì)構(gòu)造剖面測(cè)制、路線勘查、探槽揭露、節(jié)理統(tǒng)計(jì)分析,結(jié)合近年來(lái)獲得的鉆孔資料,系統(tǒng)研究了相山火山盆地,特別是北部地區(qū)的主要構(gòu)造特征。論文主要取得了以下幾點(diǎn)成果與認(rèn)識(shí):(1)相山火山盆地發(fā)育于青白口紀(jì)淺變質(zhì)基底之上,經(jīng)南北向擠壓的雪峰-加里東期構(gòu)造運(yùn)動(dòng),基底變質(zhì)巖系形成北東東向褶皺,由北向南分別為培坊倒轉(zhuǎn)向斜、潭港-相山復(fù)式背斜和南美峰向斜。相山火山盆地發(fā)育于潭港-相山復(fù)式褶皺東端核部。(2)相山火山盆地北部地區(qū)發(fā)育有三條北東向主干斷裂,即鄒家山-石洞斷層和巴前-袁家山斷層和布水-上泥漿斷層,受遂川-德興深斷裂的影響,這些北東向斷層為研究區(qū)的主要構(gòu)造行跡,其活動(dòng)具有明顯的階段性,加里東期-燕山期主要以左行走滑為主,燕山晚期表現(xiàn)為伸展拉張作用,喜山期則主要體現(xiàn)為區(qū)域擠壓作用。(3)相山火山盆地北部地區(qū)近東西向逆斷層為一系列產(chǎn)狀一致,性質(zhì)相似的高角度逆斷層,形成時(shí)間可能早于早白堊火山活動(dòng)時(shí)間。該斷層可能形成時(shí)代可追溯致加里東期,伴隨近東西向復(fù)式背斜的形成而產(chǎn)生,具有多期活動(dòng)的特征。相山火山盆地北部近東西向逆斷層可能經(jīng)歷了以下演化階段:加里東期,在基底復(fù)式褶皺形成過(guò)程中,形成與褶皺樞紐產(chǎn)狀一致的縱向逆斷層。后期隨著北東向遂川斷裂及其旁側(cè)同向的斷層活動(dòng),這些近東西向斷層作為北東向斷層的次一級(jí)斷層也發(fā)生活動(dòng)。由于北東向斷層的左行走滑,導(dǎo)致沿其旁側(cè)的近東西向斷層在局部應(yīng)力場(chǎng)下發(fā)生逆沖作用。燕山中期,由于大規(guī)模的巖漿活動(dòng)使得地殼深部巖漿上涌并產(chǎn)生側(cè)向擠壓,在北部盆地邊緣先存的這些近東西向斷層進(jìn)一步發(fā)生逆沖活動(dòng),并在火山活動(dòng)晚期,次火山巖隨斷裂面侵入形成巖墻。燕山晚期至喜山期,在區(qū)域內(nèi)擠壓、拉張作用的影響下,這些近東西向斷裂隨著其旁側(cè)主斷裂一起復(fù)活,在局部拉張和擠壓的應(yīng)力場(chǎng)下發(fā)生逆斷層活動(dòng)。
[Abstract]:The early Cretaceous volcanic basin of Xiangshan, Jiangxi Province, is located at the junction of the near east-west tectonic volcanic rock-type uranium metallogenic belt and the south-north Dawangshan-Yushan granite type uranium metallogenic belt.The core of the Xuefeng-Caledonian East-West Xiangtan-Xiangshan anticline developed in the Qingbakou shallow metamorphic rocks.This paper relies on the project of "Three-dimensional Geological Survey of Xiangshan volcanic Basin" of China Geological Survey, on the basis of collecting and analyzing the stratigraphic and structural data of Xiangshan volcanic basin in detail, and through the fine structural profiling and route exploration in the field,The main structural characteristics of Xiangshan volcanic basin, especially in the northern part of China, are systematically studied by means of trench disclosing, joint statistical analysis and drilling data obtained in recent years.The main achievements of this paper are as follows: (1) the Xiangshan volcanic basin developed on the Qingbakou shallow metamorphic basement. The basement metamorphic series formed east-west fold through the south-north compressional Xuefeng-Caledonian tectonic movement.From north to south, they are Peifang inverted syncline, Tangang-Xiangshan anticline and South American peak syncline.The Xiangshan volcanic basin is developed in the core of the eastern tip of the Xianggang Xiangshan fold.) in the northern part of the Xiangshan volcanic basin, there are three main faults in the NE direction, namely, the Zoujiashan-Shidong fault, the Ba-Qian-Yuanjiashan fault and the Bushui-Upper mud fault.Influenced by the Suichuan-Dexing deep fault, these faults are the main tectonic tracks in the study area, and their activities have obvious stages. The Caledonian to Yanshanian periods are mainly left strike-slip, and the late Yanshanian faults are extensional and extensional.The Himalayan period is mainly reflected by regional compression. 3) the near east-west thrust faults in the northern part of Xiangshan volcanic basin are a series of similar high angle thrust faults, which may be formed earlier than the early Cretaceous volcanic activity.The fault may be formed in the Caledonian period with the formation of the near east-west composite anticline and has the characteristics of multi-stage activity.The near east-west thrust faults in the northern Xiangshan volcanic basin may have undergone the following evolution stages: in Caledonian period, longitudinal thrust faults were formed in the process of the formation of the basement composite folds, which are consistent with the occurrence of the fold hinge.In the latter stage, with the activity of NE-trending Suichuan fault and its flanking faults, these near-EW-trending faults are also active as the subprimary faults of NE-trending faults.Due to the left strike-slip of the NE-trending fault, the near-east-west fault along the side of the fault thrust under the local stress field.In the middle Yanshanian period, because of the large-scale magmatic activity, the deep crust magma upwelled and produced lateral compression. These near-east-west faults that existed in the northern margin of the basin occurred further thrusting, and in the late period of volcanic activity,Subvolcanic rocks intrude into the fault surface to form a rock wall.From the late Yanshanian to the Himalayan period, under the influence of regional compression and extension, these near-east-west faults were revived along with the main faults, and the thrust faults occurred in the local stress field of Zhang He.
【學(xué)位授予單位】：東華理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P542

【共引文獻(xiàn)】

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