本文選題：南海擴(kuò)張 + 滑線(xiàn)場(chǎng)�。� 參考：《海洋地質(zhì)與第四紀(jì)地質(zhì)》2017年02期

【摘要】：為了確定中南—司令斷裂帶在南海海盆及其在南部陸緣的延伸位置,并探討其與南海擴(kuò)張的關(guān)系,本文利用重磁異常、地震、莫霍面深度、P波速度特征、鉆井拖網(wǎng)資料,對(duì)中南—司令斷裂帶的延伸位置進(jìn)行了綜合地質(zhì)和地球物理研究,厘定了中南—司令斷裂帶在東部次海盆與西南、西北次海盆之間呈NS向延伸,并南延至南海南部陸緣之上,深度上切割至莫霍面。根據(jù)南海海盆中磁異常條帶走向的變化,及磁異常條帶、走滑/轉(zhuǎn)換斷裂、擴(kuò)張方向的印證關(guān)系,結(jié)合前人對(duì)古南海"剪刀狀"碰撞閉合、南海擴(kuò)張演化、構(gòu)造應(yīng)力場(chǎng)的研究,提出在32~25 Ma,伴隨著南海東部次海盆的NNW向擴(kuò)張,南海海盆及南沙地塊整體發(fā)生順時(shí)針旋轉(zhuǎn),使中南—司令斷裂走向由形成初期的NNW向轉(zhuǎn)變?yōu)镹—S向;23.5 Ma之后,順時(shí)針旋轉(zhuǎn)停止,南海東部次海盆繼續(xù)NNW向擴(kuò)張,西南次海盆呈NW—SE向漸進(jìn)式擴(kuò)張。作為一條切穿地殼的深大斷裂,中南—司令斷裂與紅河-越東斷裂、馬尼拉海溝斷裂三條深大斷裂一起組成區(qū)域"滑線(xiàn)場(chǎng)",制約南海海盆的擴(kuò)張與南沙地塊的南移。
[Abstract]:In order to determine the extension position of the SCS fault zone in the South China Sea basin and its southern margin, and to discuss its relationship with the South China Sea extension, this paper makes use of gravity and magnetic anomalies, earthquakes, Moho depth P wave velocity characteristics, drilling trawl data, etc. A comprehensive geological and geophysical study on the extension position of the Zhongnan-Shing fault zone has been carried out. It has been determined that the SCFZ extends in a NS direction between the eastern suboceanic basin, the southwest subbasin and the northwest subbasin, and extends south to the southern margin of the South China Sea. Cut deep to Moho. According to the change of the trend of the magnetic anomaly belt in the South China Sea basin, and the relationship between the magnetic anomaly belt, the strike-slip / transition fault, and the direction of the expansion, combined with the previous studies on the closure of the "scissors" collision in the ancient South China Sea, the expansion and evolution of the South China Sea, and the tectonic stress field. It is suggested that at 32 ~ 25 Ma, with the NNW expansion of the subbasin in the eastern part of the South China Sea, the whole South China Sea basin and Nansha block rotated clockwise, which changed the strike from NNW to N-S to 23.5 Ma in the early stage of the formation of the South China Sea and Nansha Block. The subbasin in the eastern part of the South China Sea continued to expand in the NNW direction, and the subbasin in the southwest of the South China Sea was gradually expanding in the direction of NW-SE. As a deep fault that cuts through the earth's crust, the three deep faults, namely, the south-central fault and the Honghe-Yuedong fault, and the Manila trench fault, together form the regional "slip field", which restricts the expansion of the South China Sea basin and the southward migration of the Nansha block.
【作者單位】： 中國(guó)科學(xué)院南海海洋研究所邊緣海與大洋地質(zhì)重點(diǎn)實(shí)驗(yàn)室;中國(guó)科學(xué)院大學(xué);廣州海洋地質(zhì)調(diào)查局國(guó)土資源部海底礦產(chǎn)資源重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(41276048,91328205,41606080和41476039) 中國(guó)海及鄰域地質(zhì)地球物理及地球化學(xué)系列圖項(xiàng)目(GZH200900504-WX02)
【分類(lèi)號(hào)】：P736
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本文編號(hào)：2040730