本文選題：郯廬斷裂帶蘇皖段　切入點(diǎn)：活斷層　出處：《合肥工業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：郯廬斷裂帶蘇皖段在白堊紀(jì)伸展活動(dòng)中表現(xiàn)為北北東走向的大型正斷層。這些正斷層在江蘇段自東向西分別簡(jiǎn)稱F1、F2、F3和F4斷層,它們控制發(fā)育了北北東向展布的東地塹、西地塹及兩者之間的地壘。東地塹內(nèi)部還出現(xiàn)了一條北北東向的F5斷層。對(duì)于郯廬斷裂帶江蘇段的野外地質(zhì)調(diào)查表明,活斷層廣泛出現(xiàn),F2、F3與Fs活斷層以逆沖活動(dòng)為主,而F1斷層北段則呈現(xiàn)為逆右行平移活動(dòng)。通過(guò)擦痕反演應(yīng)力場(chǎng)表明,這些活斷層是在北東東—南西西向擠壓作用下活動(dòng),與現(xiàn)今的應(yīng)力狀態(tài)相似。依據(jù)活斷層切割的最新地層時(shí)代及光釋光測(cè)年結(jié)果,表明F1斷層北段最新活動(dòng)時(shí)代為全新世,F4斷層北段在第四紀(jì)以來(lái)發(fā)生過(guò)活動(dòng),而其南段在第四紀(jì)以來(lái)沒(méi)有明顯活動(dòng),江蘇段其余活斷層的最新活動(dòng)時(shí)代為晚更新世�；顢鄬游灰茢�(shù)據(jù)及第四系沉積特征顯示,在時(shí)間上晚更新世為較強(qiáng)活動(dòng)期,而空間上F2與F5斷層的活動(dòng)強(qiáng)度最大。實(shí)地調(diào)查表明,F1、F2、F3及F4活斷層多為白堊系地塹邊界正斷層直接復(fù)活成因,具有不均一分段活動(dòng)的特點(diǎn)。傾向多變的F5活斷層則是利用東地塹邊界斷層的同向或反向正斷層復(fù)活。郯廬斷裂帶主干脆性正斷層進(jìn)入嘉山盆地后,轉(zhuǎn)變?yōu)閮蓷l斷層,進(jìn)入合肥盆地東緣后轉(zhuǎn)變?yōu)橐粭l斷層,向南沿大別造山帶東緣延伸。野外地質(zhì)調(diào)查表明,郯廬斷裂帶安徽段活斷層也是廣泛存在,自北向南分別沿著嘉山盆地的東、西邊界、合肥盆地東界與大別造山帶東界分布。它們自北向南由北北東走向轉(zhuǎn)為北東走向,傾向上與早期盆緣正斷層傾向一致。這些活斷層以逆右行平移活動(dòng)為主,但顯示了逆沖分量隨著斷層傾角變小而增大的現(xiàn)象。依據(jù)一系列擦痕實(shí)測(cè)數(shù)據(jù)的反演,顯示這些活斷層活動(dòng)時(shí)的區(qū)域應(yīng)力狀態(tài)為北東東—南西西向擠壓,也與現(xiàn)代應(yīng)力狀態(tài)一致。依據(jù)多種現(xiàn)象綜合分析,本文認(rèn)為郯廬斷裂帶安徽段活斷層的最新活動(dòng)時(shí)代應(yīng)為中更新世,從而該段沒(méi)有強(qiáng)震記錄或小震群集現(xiàn)象。本次工作表明,區(qū)內(nèi)活斷層主體上是早期盆緣正斷層直接復(fù)活成因。由于其第四紀(jì)期間有限的累計(jì)垂直位移分量,并沒(méi)有改變白堊一古近紀(jì)盆地發(fā)育階段的地貌格局。
[Abstract]:During the Cretaceous extensional activities, the Jiangsu and Anhui sections of the Tan-Lu fault zone were characterized by large normal faults in the NNE strike. These normal faults are referred to as F1F2F3 and F4 faults from east to west, respectively, in Jiangsu, which control the development of NNE trending eastern graben. There is also a NNE F5 fault in the east graben. The field geological investigation in Jiangsu section of the Tanlu fault zone shows that the active faults are mainly thrust activity. On the other hand, the northern segment of F1 fault shows an inverse right-lateral translation activity. The inversion of stress field by scratch indicates that these active faults are active under the action of NW-W compression. It is similar to the present stress state. According to the latest stratigraphic age of active fault cutting and the results of photoluminescence dating, it is shown that the latest active age of the northern segment of F1 fault is that the northern segment of the Holocene fault has been active since the Quaternary. The last active age of the rest active faults in Jiangsu is the late Pleistocene. The displacement data of the active faults and the sedimentary characteristics of the Quaternary show that the late Pleistocene is a strong active period in time. The active faults of F _ 2 and F _ 5 are the most active in space. The field investigation shows that the active faults of F _ 1, F _ 2, F _ 2, F _ 3 and F _ 4 are the direct resurrection of the Cretaceous graben boundary normal faults. The F5 active fault, which tends to be changeable, is reactivated by the same or opposite normal fault of the eastern graben boundary fault. The main brittleness normal fault of the Tanlu fault zone is transformed into two faults after entering the Jiashan basin, and the main brittleness normal fault of the Tanlu fault zone enters the Jiashan basin. After entering the eastern margin of Hefei Basin, the fault was transformed into a fault, extending southward along the eastern margin of the Dabie orogenic belt. Field geological investigations show that active faults in Anhui section of the Tanlu fault zone are also widespread, from north to south along the eastern and western boundaries of the Jiashan basin, respectively. The eastern boundary of Hefei basin and the eastern boundary of Dabie orogenic belt are distributed from north to south from north to south to north to east, which tend to be consistent with the early basin margin normal faults. But it shows that the thrust component increases with the decrease of fault dip angle. Based on the inversion of a series of measured data of scratch marks, it is shown that the regional stress state of these active faults is east-west compression. It is also consistent with the modern stress state. Based on the comprehensive analysis of various phenomena, this paper holds that the latest active age of the active faults in Anhui section of the Tanlu fault zone should be the Middle Pleistocene, so that there is no strong earthquake record or small earthquake cluster phenomenon in this section. The main body of active faults in the area is the direct resurrection of the early basin margin normal faults. Due to the limited accumulative vertical displacement components during the Quaternary period, the geomorphological pattern of the Cretaceous Paleogene basin development stage has not been changed.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P546

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本文編號(hào)：1592910