【摘要】：華東南大陸在中生代時(shí)期發(fā)育規(guī)模宏大的陸內(nèi)變形和火成巖省,為研究大地構(gòu)造過(guò)程以及陸內(nèi)變形提供理想研究場(chǎng)所。華東南內(nèi)陸贛南地區(qū)三百山盆地和版石盆地的主體由早白堊世早期武夷群火山巖系組成,它不整合在南華-寒武系變質(zhì)巖系之上,并被早白堊世晚期羅塘群或晚白堊世圭峰群紅色沉積巖系不整合覆蓋。在三百山盆地內(nèi),南華紀(jì)變質(zhì)巖推覆于武夷群鵝湖嶺組火山巖之上,形成多個(gè)飛來(lái)峰。在版石盆地內(nèi),逆沖斷層發(fā)育,震旦紀(jì)變質(zhì)巖系逆掩于鵝湖嶺組火山巖之上,且變質(zhì)巖系內(nèi)部發(fā)育了逆沖斷層以及發(fā)生了連續(xù)的褶皺變形;武夷群石溪組地層發(fā)育褶皺構(gòu)造,地層產(chǎn)狀直立甚至倒轉(zhuǎn),且泥巖層撓曲構(gòu)造相當(dāng)發(fā)育,并有硅化變質(zhì)現(xiàn)象。這些現(xiàn)象表明,贛南地區(qū)武夷群火山巖系形成之后發(fā)生過(guò)強(qiáng)烈的擠壓構(gòu)造事件。不整合在三百山盆地武夷群火山巖系之上的羅塘群白埠組礫巖層和不整合在版石盆地武夷群火山巖系之上的圭峰群河口組底部的礫巖層,具有近源快速堆積的特征,構(gòu)造變形微弱;版石盆地東側(cè)的會(huì)昌盆地羅塘群白埠組紅色沉積巖系的構(gòu)造變形微弱,不僅底部礫巖層具有近源快速堆積的特征,而且其底部夾層粗面巖具有埃達(dá)克巖和高壓型粗面巖的地球化學(xué)特征。這些現(xiàn)象表明,贛南地區(qū)的擠壓構(gòu)造事件發(fā)生在武夷群火山巖系形成之后,羅塘群紅色沉積巖系形成之前�；鹕綆r年代學(xué)資料顯示,版石盆地內(nèi)武夷群石溪組的流紋巖以及鵝湖嶺組的凝灰?guī)rSHRIMP鋯石U-Pb年齡分別為130.8±0.7Ma和142.6±1.0Ma,三百山盆地武夷群鵝湖嶺組的粗面巖SHRIMP鋯石U-Pb年齡為141.6±0.96Ma,會(huì)昌盆地內(nèi)羅塘群白埠組的粗面巖SHRIMP鋯石U-Pb年齡為110.7±1Ma。結(jié)合贛南地區(qū)普遍缺失早白堊世中期地層,說(shuō)明擠壓構(gòu)造事件發(fā)生在131Ma之后、111Ma之前。構(gòu)造變質(zhì)巖年代學(xué)資料顯示,版石盆地逆掩斷層中新生礦物絹云母的K-Ar稀釋法年齡為118.21±3.21Ma,三百山盆地變質(zhì)巖系飛來(lái)峰底部的逆掩斷層中新生礦物絹云母的K-Ar稀釋法年齡為112.90±3.65Ma,指示擠壓構(gòu)造事件發(fā)生在118~113Ma之間。華東南內(nèi)陸早白堊世早期(145-130Ma)廣泛發(fā)育高鉀鈣堿性火山-侵入巖,早白堊世晚期-晚白堊世早期(110-90Ma)廣泛發(fā)育鐵鎂質(zhì)火山巖,前者構(gòu)成火山-侵入巖帶的主體,后者常夾于紅色沉積巖系的底部。而早白堊世中期(130-110Ma)也是火山-侵入活動(dòng)的相對(duì)寧?kù)o期,暗示其構(gòu)造環(huán)境既不同于早白堊世早期由擠壓向拉張過(guò)渡的構(gòu)造環(huán)境,也與早白堊世晚期-晚白堊世早期強(qiáng)烈拉張的構(gòu)造環(huán)境存在區(qū)別。運(yùn)動(dòng)學(xué)特征顯示,華東南內(nèi)陸早白堊世中期擠壓應(yīng)力方向?yàn)镹W-SE向,與華東南陸緣早白堊世中期擠壓構(gòu)造事件的擠壓應(yīng)力方向一致,指示早白堊世中期華東南內(nèi)陸和陸緣的擠壓構(gòu)造事件存在內(nèi)在的聯(lián)系。華東南內(nèi)陸早白堊世中期擠壓構(gòu)造事件的確認(rèn),結(jié)合前人確認(rèn)的中侏羅世擠壓構(gòu)造事件,為華東南地區(qū)燕山期構(gòu)造演化具有拉張-擠壓“手風(fēng)琴”式的多旋回特征提供了充實(shí)而有力的地質(zhì)證據(jù),也為成礦構(gòu)造背景分析應(yīng)兼顧擠壓構(gòu)造事件的影響提供了依據(jù)。
[Abstract]:The Sanbaishan basin and slate basin in southeastern China are composed of volcanic rocks of the early Early Cretaceous Wuyi Group, which are unconformity to the South China-Cambrian system. In Sanbaishan basin, the South China metamorphic rocks were pushed over the volcanic rocks of Ehuling Formation of Wuyi Group, forming several flying peaks. In lithographic basin, thrusting faults developed and the Sinian metamorphic rocks were overturned in Ehuling Formation. Above the volcanic rocks, thrusting faults and continuous folding deformation occurred in the metamorphic rock series. Fold structures developed in the Shixi Formation of the Wuyi Group, and the occurrence of the strata was upright or even inverted. The deflection structures of the mudstone layers were well developed and silicified metamorphism occurred. These phenomena indicate that the volcanic rock series of the Wuyi Group developed after the formation of the southern Jiangxi Province. The Baibu Formation conglomerate of Luotang Group unconformity above Wuyi Group volcanic rock series in Sanbaishan Basin and the bottom conglomerate of Hekou Formation unconformity above Wuyi Group volcanic rock series in Banshi Basin are characterized by rapid accumulation near source and weak tectonic deformation. The tectonic deformation of the red sedimentary rock series of Baibu Formation of Luotang Group is weak, and the conglomerate strata at the bottom are characterized by rapid accumulation near source, and the interbedded trachyte at the bottom has the geochemical characteristics of adakite and high-pressure trachyte. Before the formation of the red sedimentary rock series of Luotang Group, the U-Pb ages of zircon SHRIMP from the rhyolite of Shixi Formation and tuff of Ehuling Formation of Wuyi Group in the slate basin were 130.8 6550 The U-Pb age of zircon SHRIMP from Baibu Formation of Luotang Group in the basin is 110.7 The K-Ar dilution age of Sericite in the overthrust fault at the bottom of Feilaifeng peak of the metamorphic rock series in Sanbaishan basin is 112.90 (+3.65 Ma), indicating that the compressional tectonic event occurred between 118 and 113 Ma. High-K calc-alkaline volcanic-intrusive rocks were extensively developed in the early Early Cretaceous (145-130 Ma) of southeastern China, and the late Early Cretaceous-late Cretaceous. Ferromagnesian volcanic rocks were extensively developed in the early stage (110-90 Ma), the former constituting the main body of the volcanic-intrusive rock zone, and the latter often sandwiched at the bottom of the red sedimentary rock series. The middle stage of the Early Cretaceous (130-110 Ma) was also a relatively quiet period of volcanic-intrusive activity, suggesting that its tectonic environment was different from the tectonic ring transiting from compression to extension in the early Cretaceous. Kinematic characteristics show that the compressive stress direction of the southeastern China inland during the middle stage of the Early Cretaceous is NW-SE, which is consistent with the compressive stress direction of the middle stage of the Early Cretaceous in the continental margin of southeastern China, indicating the southeastern China inland and continental in the middle stage of the Early Cretaceous. There is an intrinsic relationship between the extrusion tectonic events on the margin. The confirmation of the extrusion tectonic events in the middle Early Cretaceous in the southeastern China inland and the predecessor's confirmation of the extrusion tectonic events in the middle Jurassic provide substantial and powerful geological evidence for the Yanshanian tectonic evolution in southeastern China with the multi-cycle characteristics of tension-compression "accordion" and also provide strong geological evidence for it. The analysis of metallogenic tectonic background should give consideration to the influence of extrusion tectonic events.
【學(xué)位授予單位】：東華理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：P542;P534.53

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