本文選題：活動斷裂 + 活動斷裂探測��； 參考：《江西理工大學》2015年碩士論文

【摘要】：沙灣斷裂帶是珠江三角洲內(nèi)重要的斷裂構(gòu)造,其延伸長、影響區(qū)域大,成為了廣州、佛山等周邊城市發(fā)展的內(nèi)部隱患。因此,針對沙灣斷裂帶開展研究,掌握其時空發(fā)展規(guī)律,判斷其當前的活動情況,對當?shù)亻_展防震減災工作具有十分重要的意義。在搜集區(qū)域地質(zhì)資料后,本研究有序開展了地表調(diào)查、槽探、地球物理勘探、土壤測氡、聯(lián)合鉆孔、年代測試等工作,主要從斷裂地貌、近現(xiàn)代地震、斷裂切割最新地層、斷層氣異常、年代測試結(jié)果等方面進行了斷層活動性分析�；诜治鼋Y(jié)果,本文初步討論了沙灣斷裂帶的形成演化過程。全文研究成果如下:(1)沙灣斷裂帶對珠江三角洲的現(xiàn)代地形地貌控制較弱,所誘發(fā)的地震震級也未超過6級,顯示其活動性不強。(2)地表露頭處普遍可見壓扭、張剪性相互疊加,表明沙灣斷裂帶在多起重大構(gòu)造事件作用下發(fā)生了多期活動。根據(jù)活動斷裂探測結(jié)果反映,僅發(fā)現(xiàn)分支斷裂紫泥-靈山斷裂(F013)在大崗十八羅漢山處第四紀活動跡象明顯,測年結(jié)果為晚更新世早期-中期,證明了F013在該處表現(xiàn)為活動斷裂。但斷裂帶的其余分支均未發(fā)現(xiàn)斷層錯動第四系的現(xiàn)象,測年資料上也缺乏晚更新世活動的證據(jù),因此現(xiàn)階段無法將斷裂帶的其余分支評價為活動斷裂。(3)根據(jù)斷層氣探測分析的結(jié)果,沙灣斷裂帶主斷裂面F007的活動性較東側(cè)的F008、F010更強,結(jié)合當前F007西側(cè)的F013在斷裂帶內(nèi)第四紀活動性最為顯著的特點,此現(xiàn)象或許揭示了斷裂帶內(nèi)部各分支斷裂的活動規(guī)律,具體有待進一步驗證。(4)沙灣斷裂帶在白堊紀燕山運動時期形成;古近紀時活動增強;在新近紀喜山運動第二幕時期活動顯著,影響并控制著珠江三角洲基底地貌的形成;在第四紀期間活動性先減弱、后增強、再減弱,在近期總體表現(xiàn)弱活動斷裂。
[Abstract]:The Shawan fault zone is an important fault structure in the Pearl River Delta. Its extension is long and the influence area is large. It has become the internal hidden danger of the development of the surrounding cities such as Guangzhou Foshan and so on. Therefore, it is of great significance for the work of earthquake prevention and disaster reduction to study the Shawan fault zone, master its space-time development law, and judge its current activities. After collecting regional geological data, this study carried out in an orderly manner the work of surface survey, trough exploration, geophysical exploration, soil radon measurement, combined drilling, age testing, etc., mainly from fault landforms, modern earthquakes, and fault cutting of the latest strata. Fault activity analysis was carried out on fault gas anomaly and age test results. Based on the analysis results, the formation and evolution of the Shawan fault zone are discussed in this paper. The results of this study are as follows: (1) the Shawan fault zone has weak control over the modern topography and geomorphology of the Pearl River Delta, and the magnitude of the induced earthquake does not exceed magnitude 6, indicating that its activity is not strong. 2) the pressure and torsion are generally visible at the outcrops on the surface, and the tension and shear superimpose on each other. It shows that the Shawan fault zone has been active for many periods under the action of many major tectonic events. According to the results of active fault detection, only the branch fault Zinie-Lingshan fault F013) is found to show obvious signs of Quaternary activity in the Lohan Mountains of Dagang 18, and the dating results are early to the middle of the late Pleistocene, which proves that F013 is an active fault there. However, the other branches of the fault zone have not found the fault dislocation of Quaternary, and the dating data are also lack of evidence of late Pleistocene activity. Therefore, it is not possible to evaluate the other branches of the fault zone as active fault. (3) according to the results of fault gas detection and analysis, the activity of F007 on the main fault surface of Shawan fault zone is stronger than that of F008 / F010 on the east side of the fault zone. Combined with the most prominent Quaternary activity of F013 on the west side of F007 fault zone, this phenomenon may reveal the activity law of each branch fault in the fault zone. It needs further verification that the Shawan fault zone formed during the Yanshanian movement in the Cretaceous, increased in the Paleogene period, and was significantly active in the second act of the Neogene Jixi Mountain Movement, which influenced and controlled the formation of the basement geomorphology in the Pearl River Delta. During the Quaternary period, the activity first weakened, then increased, and then weakened.
【學位授予單位】：江西理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P315;P542.3

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