發(fā)布時(shí)間：2018-09-14 18:26

【摘要】：遼西建昌南部喇嘛洞、王家店一帶位于燕山板內(nèi)造山帶東段近WE向右行走滑構(gòu)造系統(tǒng)與遼西NE-NNE向逆沖構(gòu)造和伸展構(gòu)造系統(tǒng)的匯聚區(qū)域。中生代以來(lái)受到古亞洲洋構(gòu)造域以及古太平洋構(gòu)造域共同作用影響,在本區(qū)形成了復(fù)雜的構(gòu)造形跡。前人工作已經(jīng)對(duì)這些構(gòu)造形跡的幾何形態(tài)以及運(yùn)動(dòng)學(xué)性質(zhì)有所認(rèn)識(shí),但是它們的形成時(shí)代、相互關(guān)系、變形期次及其與區(qū)域構(gòu)造系統(tǒng)之間的聯(lián)系,尚未得到很好揭示。本文通過(guò)對(duì)研究區(qū)褶皺-斷裂構(gòu)造開展幾何學(xué)、運(yùn)動(dòng)學(xué)性質(zhì)研究,并結(jié)合關(guān)鍵地質(zhì)體同位素測(cè)年與斷層滑動(dòng)矢量應(yīng)力反演結(jié)果,初步厘定了本區(qū)中生代構(gòu)造變形以及古應(yīng)力場(chǎng)演化的4個(gè)期次:(1)早侏羅世之前(~191.6Ma)近NS向擠壓應(yīng)力場(chǎng)下形成了近EW向正向逆沖構(gòu)造。(2)晚侏羅世土城子組-早白堊世義縣組階段為(141.7~126Ma)NW-SE向擠壓應(yīng)力場(chǎng),控制近EW向右行走滑系統(tǒng)的形成,同時(shí)也主導(dǎo)了本區(qū)中生代基本構(gòu)造格局的形成。(3)早白堊世九佛堂組沉積階段(126~119Ma)為NW-SE到NNW-SSE向伸展應(yīng)力場(chǎng),控制本區(qū)NNE向伸展斷裂系統(tǒng)的形成。(4)早白堊世九佛堂組沉積之后-晚白堊世階段(119~66Ma)經(jīng)歷了NE-SW向擠壓應(yīng)力場(chǎng)作用,控制了本區(qū)NW-NNW向褶皺-斷裂構(gòu)造系統(tǒng)的形成,對(duì)早期構(gòu)造產(chǎn)生部分疊加、改造作用,但改造并不強(qiáng)烈,并未改變?cè)袠?gòu)造格局。不同階段構(gòu)造變形對(duì)應(yīng)了不同的區(qū)域構(gòu)造背景。近NS向擠壓應(yīng)力場(chǎng)主要受到了古亞洲洋閉合之后的持續(xù)作用控制;近EW向右行走滑系統(tǒng)受到了古亞洲洋構(gòu)造系統(tǒng)與古太平洋構(gòu)造系統(tǒng)的聯(lián)合作用;NNE向伸展斷裂系統(tǒng)與NW-NNW向褶皺-斷裂系統(tǒng)則主要與太平洋板塊向歐亞大陸俯沖作用有關(guān)。
[Abstract]:The Lama Cave and Wangjiadian area in the south of Jianchang, western Liaoning Province, are located in the convergence area of the WE-right strike-slip tectonic system and NE-NNE-trending thrusting and extensional tectonic system in the eastern Yanshan intraplate orogenic belt. Traces. Previous work has known about the geometry and kinematics of these structural traces, but their formation ages, interrelationship, deformation stages and their relationship with the regional tectonic system have not been well revealed. Four stages of Mesozoic tectonic deformation and paleo-stress field evolution in this area are preliminarily determined according to isotope dating of key geological bodies and inversion results of fault slip vector stress: (1) Near EW-trending forward thrust structures were formed under near NS-trending compressive stress field before Early Jurassic (~191.6 Ma). (2) Tuchengzi Formation of Late Jurassic-Yixian Formation of Early Cretaceous. The stage is (141.7-126 Ma) NW-SE compressive stress field, which controls the formation of near EW-right strike-slip system and also dominates the formation of Mesozoic basic tectonic framework. (3) The early Cretaceous Jiufotang Formation sedimentary stage (126-119 Ma) is NW-SE to NNW-SSE extensional stress field, which controls the formation of NNE-trending extensional fault system in this area. (4) Early Cretaceous. After sedimentation of the Jiufotang Formation, the Late Cretaceous (119-66Ma) underwent NE-SW compressive stress field, which controlled the formation of NW-NNW Fold-Fault tectonic system in this area. The early structure was partly superimposed and reformed, but the reformation was not strong and did not change the original tectonic framework. TECTONIC BACKGROUND: Near NS-trending compressive stress field is mainly controlled by the sustained action after the closure of the Paleo-Asian Ocean; near EW-trending dextral strike-slip system is affected by the combination of the Paleo-Asian Ocean tectonic system and the Paleo-Pacific tectonic system; NNE-trending extensional fault system and NW-NNW-trending Fold-Fault system are mainly subducted from the Pacific plate to the Eurasian continent Impact is related.
【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P542

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