本文選題：探地雷達(dá) + 沖積扇　； 參考：《沉積學(xué)報(bào)》2016年04期

【摘要】：福建海壇島北部海岸發(fā)育一座覆蓋淡灰黃色風(fēng)成砂層、相對高度達(dá)30 m的大沙山,外貌很像風(fēng)成大沙丘,但同時(shí)又具有沖積扇形態(tài)。其成因和沉積環(huán)境有待考證,而探明大沙山內(nèi)部沉積構(gòu)造是判別其成因的主要途徑之一。在野外考察的基礎(chǔ)上,運(yùn)用探地雷達(dá)(GPR)對大沙山內(nèi)部沉積構(gòu)造進(jìn)行探測,獲得約20 m深度范圍內(nèi)的沉積構(gòu)造圖像數(shù)據(jù)。結(jié)果表明:大沙山中上部發(fā)育由棱角狀礫石或粗砂細(xì)砂組成的沉積旋回和溝槽沉積構(gòu)造,顯示出沖積扇上部的沉積構(gòu)造組合特點(diǎn);中下部層面中交替呈現(xiàn)弧形沉積構(gòu)造,大沙山南側(cè)發(fā)育有向南傾斜28°~30°的前積層理。結(jié)合大沙山西側(cè)沖溝剖面沉積構(gòu)造、大沙山表面的棱角狀礫石特征以及現(xiàn)代風(fēng)沙地貌分布規(guī)律,初步認(rèn)為大沙山是山前多期溝谷洪流攜帶的碎屑物沉積形成的沖積扇殘余堆積體,沉積間隙受海岸帶風(fēng)沙活動(dòng)影響。
[Abstract]:On the northern coast of Haitan Island, Fujian Province, there is a pale yellowish eolian sand layer, which is about 30 m high. Its appearance is very similar to that of wind-formed sand dune, but it also has the shape of alluvial fan at the same time. Its origin and sedimentary environment need to be studied, and it is one of the main ways to identify the origin of Dasha Mountain. On the basis of field investigation, ground penetrating radar (GPR) was used to detect the sedimentary structure in Dasha Mountain, and the sedimentary structure image data were obtained in the depth of about 20 m. The results show that sedimentary cycle and trench sedimentary structure are developed in the middle and upper part of Dasha Mountain, which consists of angular gravel or fine sand, which shows the characteristics of sedimentary tectonic assemblage in the upper part of alluvial fan, and alternately arcuate sedimentary structure in the middle and lower layers. On the south side of Dasha Mountain, there are antecedent stratigraphy tilting 28 擄to 30 擄south. Combined with the sedimentary structure of the west side of Dasha Mountain, the characteristics of the prism and gravel on the surface of Dasha Mountain and the distribution law of modern aeolian geomorphology, It is preliminarily considered that Dasha Mountain is a remnant deposit of alluvial fan formed by detritus deposited by multi-stage gully flood current in front of the mountain, and the sedimentary gap is affected by the aeolian sand activity in the coastal zone.
【作者單位】： 福建師范大學(xué)地理科學(xué)學(xué)院;濕潤亞熱帶生態(tài)地理過程省部共建教育部重點(diǎn)實(shí)驗(yàn)室;福建師范大學(xué)地理研究所;
【基金】：國家自然科學(xué)基金項(xiàng)目(41271031;41301012) 國家自然科學(xué)基金委員會(huì)—福建省人民政府促進(jìn)海峽兩岸科技合作聯(lián)合基金(U1405231)~~
【分類號】：P736.21

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