東昆侖斷裂東端塔藏?cái)嗔褖杭艋顒?dòng)與高原隆升作用討論
發(fā)布時(shí)間：2018-04-30 22:35
本文選題：塔藏?cái)嗔?/strong> + 東昆侖斷裂帶��； 參考：《地質(zhì)學(xué)報(bào)》2017年07期
【摘要】：塔藏?cái)嗔盐挥跂|昆侖斷裂帶東端,橫貫青藏高原東緣的高原內(nèi)部和邊緣,因?qū)儆诎皖伩瓑K體向東南運(yùn)移的東北側(cè)邊界帶,其晚第四紀(jì)活動(dòng)性質(zhì)和滑動(dòng)速率對(duì)認(rèn)識(shí)青藏高原的構(gòu)造變形模式極端重要。本文綜合SPOT、中巴資源衛(wèi)星等高分辨率遙感影像解譯,利用沖溝、山脊、斷錯(cuò)河流階地、斷層槽谷、反向坎等地震地貌的識(shí)別,開(kāi)展詳細(xì)的斷錯(cuò)地層、地貌研究和系列年代學(xué)樣品采集測(cè)試,對(duì)塔藏?cái)嗔训木?xì)幾何展布、晚第四紀(jì)活動(dòng)性質(zhì)、滑動(dòng)速率進(jìn)行詳細(xì)分析。塔藏?cái)嗔炎晕飨驏|可分為青藏高原內(nèi)部的羅叉段、青藏高原邊緣的東北村段和馬家磨段,各段走向依次為113°、142°、130°,逐漸向南偏轉(zhuǎn),晚第四紀(jì)的活動(dòng)表現(xiàn)為分段性和多期性。羅叉段全新世以左旋剪切走滑為主兼擠壓活動(dòng),左旋走滑速率為2.43~2.89mm/a左右,最新地表斷錯(cuò)事件發(fā)生在0.66±0.04ka BP以來(lái),斷層面表現(xiàn)出走滑斷層的近垂直和張裂并發(fā)育充填楔的典型特征,塔藏?cái)嗔褳闁|昆侖斷裂系東延的主要斷裂之一;馬家磨段也為全新世活動(dòng)斷層,距今9.0±0.8ka的地層被斷錯(cuò),而且斷層面北傾達(dá)58°。因此,對(duì)比分析塔藏?cái)嗔迅鞫位顒?dòng)特征可見(jiàn),西部以水平剪切運(yùn)動(dòng)為主,而東部走滑運(yùn)動(dòng)分量逐漸變?nèi)?斷面北傾、北盤(pán)上升導(dǎo)致的垂向分量逐漸變大。東昆侖斷裂帶及塔藏?cái)嗔淹淼谒募o(jì)走滑速率向東規(guī)則減小,并轉(zhuǎn)化為橫向逆沖作用和高原隆升,符合"疊瓦狀逆沖轉(zhuǎn)換—有限擠出模型"的特征。
[Abstract]:The Ta-Zang fault is located at the eastern end of the East Kunlun fault zone, and traverses the interior and edge of the plateau in the eastern margin of the Qinghai-Xizang Plateau, because it belongs to the northeast boundary zone of the Bayankala block moving to the southeast. The late Quaternary activity and slip rate are extremely important for understanding the tectonic deformation model of the Qinghai-Xizang Plateau. In this paper, SPOT, CBERS and other high-resolution remote sensing images are used to identify the seismic landforms, such as gullies, ridges, faulted river terraces, fault troughs, reverse ridges, and so on, to carry out detailed faulted strata. Geomorphological study and collection and measurement of a series of chronological samples, detailed analysis of the fine geometric distribution of the Ta-Zang fault, the late Quaternary active properties and the sliding rate are carried out in detail. From west to east, the Tazang fault can be divided into Luochi section, northeast village section and Majiamo section of the Qinghai-Tibet Plateau margin. The strike of each segment is 113 擄~ 142 擄~ (130 擄), gradually deflecting southward, and the late Quaternary activities are piecewise and multi-period. In the Holocene of Luochi formation, the left-lateral shear strike-slip is dominant and compressional, and the left-lateral strike-slip rate is about 2.43~2.89mm/a. The latest surface fault events occurred since 0.66 鹵0.04ka BP. The fault plane shows the typical characteristics of the runaway slip fault near vertical and extensional faults and the development of filling wedge. The Tazang fault is one of the main faults in the east extension of the East Kunlun fault system, and the Majiamo formation is also a Holocene active fault. The stratum of 9.0 鹵0.8ka is faulted and the fault plane dips northward to 58 擄. Therefore, by comparing and analyzing the active characteristics of each segment of the Ta-Zang fault, it can be seen that the west is dominated by horizontal shear movement, while the component of the eastern strike-slip motion becomes weaker, the section tilts northward, and the vertical component caused by the rise of the north face gradually becomes larger. The late Quaternary strike-slip rate of the East Kunlun fault zone and the Ta-Tibet fault decreases eastward and is transformed into transversal thrusts and uplift of the plateau, which accords with the characteristics of "imbricate thrust-transformation finite extrusion model".
【作者單位】： 中國(guó)地震局地震預(yù)測(cè)重點(diǎn)實(shí)驗(yàn)室地震預(yù)測(cè)研究所;中國(guó)地震局第一監(jiān)測(cè)中心;山東省地震局;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(編號(hào)41302171、41272233) 國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(編號(hào)2008CB42570) 地震預(yù)測(cè)研究所基本科研業(yè)務(wù)經(jīng)費(fèi)(編號(hào)2017IES0302、2017IES010204)聯(lián)合資助成果
【分類(lèi)號(hào)】：P542
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1 胡朝忠;塔藏?cái)嗔淹淼谒募o(jì)活動(dòng)性研究[D];中國(guó)地震局地震預(yù)測(cè)研究所;2011年
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