本文選題：構(gòu)造變形 + 前新生界��； 參考：《海洋地質(zhì)與第四紀(jì)地質(zhì)》2017年02期

【摘要】：為確定南海西部的中—西沙地塊是否存在前新生代地層與構(gòu)造,對研究區(qū)內(nèi)多道反射地震剖面資料進(jìn)行了地層-構(gòu)造解釋,并結(jié)合圍區(qū)鉆井、拖網(wǎng)等巖石地層資料,在研究區(qū)北部發(fā)現(xiàn)了前新生代地層-構(gòu)造變形形跡。運用回剝法、去斷層恢復(fù)法和地質(zhì)反序法對前新生代地層的構(gòu)造變形進(jìn)行了古恢復(fù)。結(jié)果表明,研究區(qū)的地層可劃分為上、中、下三套構(gòu)造層,其中屬于前新生界的下構(gòu)造層可見褶皺、逆沖等擠壓構(gòu)造樣式,前新生代末期,其構(gòu)造形態(tài)表現(xiàn)為一系列連續(xù)的寬緩褶皺,結(jié)合斷層逆沖推覆方向可判斷其主要擠壓應(yīng)力來自于東南方向,并推測該擠壓作用與古南海的擴(kuò)張有關(guān)。
[Abstract]:In order to determine whether there are pre-Cenozoic strata and structures in the Meso-Xisha block in the western part of the South China Sea, stratigraphic and structural interpretation of multi-channel reflection seismic profile data in the study area is carried out, combined with lithostratigraphic data such as drilling and trawling in the enclosed area. In the northern part of the study area, pre-Cenozoic stratigraphic-tectonic deformation patterns were found. The tectonic deformation of the pre-Cenozoic strata has been restored by the methods of back-stripping, fault-removal and geological inversion. The results show that the strata in the study area can be divided into three sets of tectonic layers, including the upper, middle and lower tectonic layers, which belong to the pre-Cenozoic, in which the compressional structural styles such as fold and thrust are visible in the lower tectonic layers, which belong to the pre-Cenozoic, and the late Cenozoic is the end of the study area. Its structural form is a series of continuous wide and slow folds, which can be judged by the direction of fault thrust and nappe, and the main compressive stress comes from the southeast direction, and it is presumed that the compression is related to the expansion of the Paleo-South China Sea.
【作者單位】： 中國科學(xué)院南海海洋研究所邊緣海與大洋地質(zhì)重點實驗室;中國科學(xué)院大學(xué);廣州海洋地質(zhì)調(diào)查局;
【基金】：國家自然科學(xué)基金項目(41476039、91328205和41276048) “中國海及鄰域地質(zhì)地球物理及地球化學(xué)系列圖”項目(GZH200900504-WX02)
【分類號】：P736.1

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