【摘要】：靈山島早白堊靈山島組發(fā)育豐富的軟沉積物變形構(gòu)造。野外踏勘船廠、燈塔和千層崖三個剖面,根據(jù)沉積外觀可分為變形層段和非變形層段兩個部分。軟沉積物變形構(gòu)造在變形層段和非變形層段均有發(fā)育。其中,變形層段中可見褶皺變形、變形層理及大型負(fù)載構(gòu)造。非變形層段可見火焰構(gòu)造、同沉積布丁構(gòu)造和同沉積微斷層。研究發(fā)現(xiàn),變形層段軟沉積物變形構(gòu)造尺度大(厚度可至十多米,長度可至數(shù)百米),側(cè)向連續(xù)性好;非變形層段軟沉積物變形構(gòu)造尺度小(厚度僅幾個厘米),側(cè)向連續(xù)性差。且變形層段和未變形層段厚度統(tǒng)計(jì)數(shù)據(jù)表明,變形層段軟沉積物變形構(gòu)造與砂巖厚度無必然聯(lián)系,而非變形層段軟沉積物變形構(gòu)造多出現(xiàn)在粒序砂巖層底部或旋回砂巖層變厚過程中。沉積環(huán)境表明,非變形層段和變形層段為一深水低角度斜坡沉積產(chǎn)物。軟沉積物變形構(gòu)造發(fā)育形態(tài)和數(shù)量受到斜坡地形的控制。結(jié)合沉積環(huán)境及沉積特征分析,認(rèn)為變形層段軟沉積物變形構(gòu)造觸發(fā)機(jī)制為地震,而非變形層段軟沉積物變形構(gòu)造觸發(fā)機(jī)制為負(fù)載作用。鋯石測年數(shù)據(jù)表明靈山島組與上覆流紋巖沉積時間相近,因此地震活動可能與巖漿侵入或早期火山噴發(fā)活動相關(guān)。此外,匯總早白堊世重要事件,發(fā)現(xiàn)靈山島組沉積、變冷事件、恐龍遷移、海平面變化和同位素偏移具有時間一致性,因此推斷這些事件可能共同對應(yīng)了早白堊世一次與火山活動相關(guān)的短期災(zāi)難性事件(如早白堊世缺氧事件)。
[Abstract]:The early Cretaceous Lingshan Island formation of Lingshan Island is rich in soft sediment deformation structure. The three sections of field exploration shipyard, lighthouse and Qianliangya can be divided into two parts according to the sedimentary appearance: deformed layer and non-deformed layer. The deformation structures of soft sediments are developed in both deformable and non-deformed layers. Among them, fold deformation, deformation bedding and large load structure can be seen in the deformed layer. Flame structure, synsedimentary pudding structure and synsedimentary micro fault can be seen in non-deformed strata. It is found that the deformation structure of soft sediment in the deformed layer is of large scale (up to more than ten meters in thickness and hundreds of meters in length), and the lateral continuity is good. The soft sediments in the non-deformable layer have a small scale of deformation structure (thickness of only a few centimeters) and poor lateral continuity. The statistical data of the thickness of deformed and undeformed strata show that the deformation structure of soft sediments in deformed strata is not necessarily related to the thickness of sandstone. However, the deformation structures of soft sediments in the non-deformable strata are mostly in the process of thickening the sandstone layers at the bottom of the grained sequence sandstone or in the cyclic sandstones. The sedimentary environment shows that the non-deformable and deformed strata are the product of deep-water low-angle slope deposition. The shape and quantity of deformation structures in soft sediments are controlled by slope topography. Based on the analysis of sedimentary environment and sedimentary characteristics, it is considered that the trigger mechanism of deformation structure of soft sediment in deformed zone is earthquake, but the trigger mechanism of deformation structure of soft sediment in non-deformed layer is load action. Zircon dating data show that the Lingshandao formation and the overlying rhyolite deposit time are close, so the seismic activity may be related to magmatic intrusions or early volcanic eruptions. In addition, summarizing the important events of early Cretaceous, it is found that the deposit, cooling event, dinosaur migration, sea level change and isotopic migration of Lingshan Island formation are consistent in time. It is inferred that these events may be associated with a short-term catastrophic event associated with volcanic activity (such as the early Cretaceous anoxic event) in the early Cretaceous.
【作者單位】： 中國石油大學(xué)地球科學(xué)與技術(shù)學(xué)院;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(編號:41572088)的成果~~
【分類號】：P534.53;P542

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本文編號：2297893