本文選題：寬甸-桓仁 + 遼吉裂谷��； 參考：《吉林大學(xué)》2016年博士論文

【摘要】：近年來,隨著我國經(jīng)濟(jì)飛速發(fā)展,消耗了大量的礦產(chǎn)資源,尤其是淺部的礦產(chǎn)資源已開采殆盡,為了保持我國經(jīng)濟(jì)的增長勢頭,亟需解決資源短缺的問題,因此深部找礦已漸漸成為資源勘查的重點(diǎn)。遼吉裂谷帶作為我國重要的成礦構(gòu)造帶,具有漫長復(fù)雜的演化歷史,具有優(yōu)越的深部成礦條件,因此,研究遼吉裂谷的深部地質(zhì)結(jié)構(gòu)對加深華北克拉通的地質(zhì)特征認(rèn)識和尋找深部礦產(chǎn)資源具有十分重要的意義。前人對于遼吉裂谷的研究主要集中于地表地質(zhì)研究,缺乏對深部地質(zhì)結(jié)構(gòu)的認(rèn)識,這在很大程度上制約了對遼吉裂谷地質(zhì)特征的全面了解和深部成礦遠(yuǎn)景預(yù)測。此次針對寬甸-桓仁(包括遼寧省寬甸縣、本溪縣、桓仁縣,及吉林省集安市西部)地區(qū)的遼吉裂谷深部地質(zhì)結(jié)構(gòu)做了系統(tǒng)研究。筆者以前人的研究成果為基礎(chǔ),以地質(zhì)與非震地球物理分析相結(jié)合為手段,收集了研究區(qū)以往的地質(zhì)資料,處理并分析了區(qū)域重力、航磁及實(shí)測非震地球物理剖面(高精度重力-高精度地磁-MT組合)等數(shù)據(jù),結(jié)合巖石物性參數(shù)對遼吉裂谷的深部地質(zhì)結(jié)構(gòu)進(jìn)行了揭示。建立了遼吉裂谷及龍崗地塊的深部地質(zhì)格架,確定了龍崗地塊與遼吉裂谷之間構(gòu)造邊界的具體位置,進(jìn)一步加深了對于遼吉裂谷演化歷史的認(rèn)識,探討了遼吉裂谷的基底結(jié)構(gòu)與組成,揭示了遼吉裂谷內(nèi)部主要地層單元、巖體、斷裂的三維空間展布和幾何形態(tài),建立了寬甸-桓仁地區(qū)的三維地質(zhì)模型。論文的主要內(nèi)容如下:(1)在研究區(qū)內(nèi)10條主干剖面的重力反演解釋及同坐標(biāo)的10條實(shí)測非震地球物理剖面的處理解釋基礎(chǔ)上,建立了研究區(qū)內(nèi)遼吉裂谷和龍崗地塊的深部地質(zhì)格架。龍崗地塊具有太古宙結(jié)晶基底與新元古界-古生界沉積蓋層雙層結(jié)構(gòu),遼吉裂谷內(nèi)的巖石建造遭受強(qiáng)烈褶皺;在靠近遼吉裂谷與龍崗地塊的構(gòu)造邊界的地區(qū)、遼河群之下為太古宙結(jié)晶基底,在遼吉裂谷的中部地區(qū)遼河群之下發(fā)育古元古代遼吉花崗巖。(2)利用重力、航磁異常切片圖組合特征,結(jié)合區(qū)域地質(zhì)資料,揭示了研究區(qū)的深部地質(zhì)結(jié)構(gòu)特征。寬甸-桓仁地區(qū)燕山期花崗質(zhì)巖體分布廣泛,并且在深部具有連片擴(kuò)大趨勢。鞍山地區(qū)存在“m”型重磁異常分布特征,結(jié)合區(qū)域地質(zhì)資料,推測這種特殊異常分布特征是由于太古代含鐵建造的褶皺所引起。(3)歐拉反褶積法對重力和磁法數(shù)據(jù)進(jìn)行處理,獲得了研究區(qū)內(nèi)的主要構(gòu)造線的延伸深度及傾向,通過與區(qū)域地質(zhì)資料的對比,發(fā)現(xiàn)這些構(gòu)造線與研究區(qū)主要斷裂和巖體的邊界相吻合,如八里甸子巖體的邊界、寒嶺-偏嶺斷裂、太平哨斷裂及二戶來斷裂等;發(fā)現(xiàn)寬甸東部的白堊紀(jì)花崗巖體在深部有連片擴(kuò)大趨勢。(4)采用了非震地球物理資料及處理結(jié)果,根據(jù)龍崗地塊與遼吉裂谷的物性差異,結(jié)合已有地質(zhì)資料,厘清了遼吉裂谷與龍崗地塊的構(gòu)造邊界的水平分布及地下展布,揭示了邊界兩側(cè)不同深度地質(zhì)體的屬性特征。研究表明,遼吉裂谷形成之初,發(fā)育了一個(gè)控盆邊界斷裂,此斷裂構(gòu)成了龍崗地塊與遼吉裂谷的原始構(gòu)造邊界,該構(gòu)造邊界是沿雙塔嶺、三道嶺、連山關(guān)、大王溝、八里甸子、二戶來、拐磨子等地,近東西向分布。該控盆邊界斷裂具有正斷層性質(zhì),后期遭受了強(qiáng)烈改造,如發(fā)育了中生代斷陷盆地及大規(guī)模早白堊世巖漿侵入等。(5)從深部地質(zhì)的角度加深了遼吉裂谷構(gòu)造演化過程的認(rèn)識。太古宙龍崗地塊和狼林地塊源于同一個(gè)微陸塊,經(jīng)歷了古元古代的裂谷作用之后,開始不斷拉伸,并且在裂谷東部有海洋形成,最后又經(jīng)歷了一次雙向的俯沖(在龍崗地塊一側(cè)向北俯沖,在狼林地塊一側(cè)向南俯沖),最終擠壓造山,形成了遼吉裂谷構(gòu)造帶。(6)通過寬甸、桓仁及集安西部地區(qū)三維地質(zhì)模型的建立,確定了以下深部地質(zhì)結(jié)構(gòu):1寬甸地區(qū)遼河群底界埋深變化較大,從南到北,深部逐漸增大。紅石、大西岔埋深小于1000m,太平哨、步達(dá)遠(yuǎn)及下露河平均埋深大于4000m,步達(dá)遠(yuǎn)以北中生代盆地處埋深可達(dá)7200m,二戶來和集安西部地區(qū)埋深約為8000m;2寬甸地區(qū)的呈緊閉線型褶皺的遼河群的底界埋深小于2000m,該區(qū)經(jīng)歷了強(qiáng)烈擠壓抬升,相當(dāng)于遼吉裂谷深部變形的產(chǎn)物;3發(fā)現(xiàn)賽馬堿性巖體底界埋深較淺,表明遭受了強(qiáng)烈剝蝕;4推測位于平頂山鎮(zhèn)、大四平鎮(zhèn)附近的復(fù)雜褶皺是由一個(gè)完整的向斜經(jīng)多期斷裂改造形成;5揭示出長甸巖體在深部具有較大分布范圍,長甸巖體為上部寬下部窄的柱狀體,該巖體西部在地下的規(guī)模較大,密度較低,推測主要為石英二長巖,巖體向東有一個(gè)分支,該巖體的底部最大埋深可達(dá)約7km。
[Abstract]:In recent years, with the rapid economic development of our country, a lot of mineral resources have been consumed, especially the mineral resources in the shallow part have been exhausted. In order to keep the economic growth of our country, it is urgent to solve the problem of resource shortage, so the deep prospecting has gradually become a heavy point of resource exploration. It has a long and complicated evolutionary history and has a superior deep metallogenic condition. Therefore, it is of great significance to study the deep geological structure of the Liaoji Rift Valley to deepen the understanding of the geological characteristics of the North China Craton and to find the deep mineral resources. The understanding of the qualitative structure has greatly restricted the comprehensive understanding of the geological features of the Liaoji Rift Valley and the prediction of the deep metallogenic prospect. This is a systematic study of the deep geological structure of the Liaoji Rift Valley in Kuandian - Huanren (including Kuandian, Benxi, Huanren, and the west of Ji'an, Jilin). On the basis of the results, the geological data of the study area have been collected by combining geological and non earthquake geophysical analysis. The data of regional gravity, aeromagnetic and measured non earthquake geophysical profiles (high precision gravity high precision geomagnetic -MT combination) are processed and analyzed. The geological structure of the deep geological structure of the Liaoji Rift Valley is combined with the physical parameters of the rock. The deep geological framework of the Liaoji Rift Valley and Longgang massif has been established. The specific location of the tectonic boundary between the Longgang massif and the Liaoji Rift Valley is determined, and the understanding of the evolution history of the Liaoji Rift Valley is further deepened, the basement structure and composition of the Liaoji rift valley are discussed, and the main stratigraphic units and rock masses in the Liaoji rift valley are revealed. Three dimensional geological models of Kuandian Huanren region are established. The main contents of this paper are as follows: (1) on the basis of the interpretation of gravity inversion of 10 main sections in the study area and the processing and interpretation of 10 measured non earthquake geophysical profiles in the same coordinates, the Liaoji Rift Valley and the Longgang land in the study area are established. The Longgang massif has a double structure of the Archean crystalline basement and the Neoproterozoic Paleozoic sedimentary cover, and the rock formation in the Liaoji Rift Valley is strongly folded; the Liao River group is the Archean crystalline basement near the Liaoji Rift Valley and the Longgang massif, and in the middle of the Liaoji Rift Valley, the Liao River is in the middle of the Liaoji rift valley. The Paleoproterozoic Liaoji granites are developed below the river group. (2) the deep geological structure of the study area is revealed by combining the characteristics of gravity and aeromagnetic anomaly slices, combining with the regional geological data. The Yanshan period granitic rock mass in Kuandian Huanren area is widely distributed and has the trend of enlargement in the deep part. The "m" type gravity and magnetic field exists in Anshan area. The anomalous distribution features, combining with the regional geological data, speculated that the special anomaly distribution was caused by the folds of Archean iron bearing formation. (3) the Euler deconvolution method was used to deal with gravity and magnetic data, and the extension depth and tendency of the main tectonic lines in the study area were obtained. By comparing with the regional geological data, it was found that Some tectonic lines are consistent with the boundary of main faults and rock masses in the study area, such as the boundary of the eight Li Dian Zi rock mass, the cold ridge - Yanling fault, the Taiping sentinel fault and the two - Household fault. It is found that the Cretaceous granite body in the east of Kuandian has the trend of enlargement in the deep section. (4) the data of non earthquake geophysical data and processing results are used, according to the Longgang massif and the The physical difference of the Liaoji Rift Valley, combining with the existing geological data, clarifies the horizontal distribution and underground distribution of the tectonic boundary between the Liaoji Rift Valley and the Longgang massif, and reveals the properties of the geological bodies of different depths on both sides of the border. The tectonic boundary of the Liaoji Rift Valley is along the Twin Towers ridge, three Dacheng mountains, Lianshan Guan, dwang Gou, eight Li Dian Zi, two households and abduction ground, and near East-West distribution. The boundary fault of the control basin has the nature of normal fault, and the later period suffered strong transformation, such as the Mesozoic faulted basin and the large-scale Early Cretaceous intrusion of magma. (5 The Archean Longgang massif and the wolf forest block originated from the same micro continental block, and after the Paleoproterozoic rift, the Archean and the wolf forest blocks began to stretch continuously and formed the ocean in the east of the rift valley, and finally experienced a two-way subduction (in the side of the Longgang massif). The North subduction, subducted on one side of the wolf forest block, eventually squeezed orogeny, formed the Liaoji Rift Valley structural belt. (6) through the establishment of three dimensional geological model in Kuandian, Huanren and the west of Ji'an, the following deep geological structure was established: 1 the depth and depth of the bottom of the Liaohe Group in the Kuandian area became larger and larger, from south to north, and gradually increased in the deep. The red stone and the big west fork were buried. The depth of deep less than 1000m, Taiping Shao, step Da Yuan and shinu river is more than 4000m, and the depth of buried depth of Mesozoic basin in north of Ji'an is up to 7200m, and the depth of buried depth in Western Ji'an is about 8000m, and the buried depth of Liaohe Group in the 2 Kuandian area is less than 2000m, and the region has experienced strong extrusion and uplift, which is equivalent to Liaoji fissure. 3 it is found that the buried depth of the base rock in the base rock of the horse is shallow, indicating strong denudation, and 4 speculated that the complex folds near the town of Pingdingshan and the town of the Siping town were formed by a complete syncline and multistage fracture, and 5 revealed that the long meadow rock has a larger distribution in the depth, and the meadow rock mass is the lower part of the upper part. In the west of the rock mass, the rock mass is large and low in density. It is presumed to be mainly quartz two long rock, and the rock mass has a branch eastward. The maximum depth of the rock bottom can reach about 7km..
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2016
【分類號】：P542
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本文編號：2117976