大地构造与成矿学
大地構造與成礦學
대지구조여성광학
GETECTONICA ET METALLOGENIA
2014年
1期
52-61
,共10页
孙文军%赵淑娟%李三忠%索艳慧%刘鑫%楼达%余珊%杨朝%王学斌%李涛
孫文軍%趙淑娟%李三忠%索豔慧%劉鑫%樓達%餘珊%楊朝%王學斌%李濤
손문군%조숙연%리삼충%색염혜%류흠%루체%여산%양조%왕학빈%리도
准噶尔盆地%中生代%构造迁移%逆冲推覆
準噶爾盆地%中生代%構造遷移%逆遲推覆
준갈이분지%중생대%구조천이%역충추복
Junggar Basin%Mesozoic%tectonic migration%thrusting
构造迁移是盆地发展演化过程中十分普遍的地质现象，但准噶尔盆地东部地区相关研究程度较低。本文基于对准噶尔盆地东部地区所开展的大量地震剖面解释，并综合前人研究成果，对准噶尔盆地东部地区中生代构造迁移特征进行了系统讨论。准噶尔盆地东部中新生代期间属于陆内，受西伯利亚板块持续向南楔入的远程效应，其构造特征总体表现出自北向南的迁移规律，具体表现为盆地内的逆冲断裂迁移、沉积沉降中心迁移、断陷的萎缩与消亡等自北向南逐步变新。最后，从板缘和板内过程和机制，探讨了该盆地东部的中生代构造迁移机制，这种构造-沉积-成盆等的向盆内变新迁移是中生代以来准噶尔盆地基底向西挤出构造和中生代西伯利亚板块向南楔入的联合效应。
構造遷移是盆地髮展縯化過程中十分普遍的地質現象，但準噶爾盆地東部地區相關研究程度較低。本文基于對準噶爾盆地東部地區所開展的大量地震剖麵解釋，併綜閤前人研究成果，對準噶爾盆地東部地區中生代構造遷移特徵進行瞭繫統討論。準噶爾盆地東部中新生代期間屬于陸內，受西伯利亞闆塊持續嚮南楔入的遠程效應，其構造特徵總體錶現齣自北嚮南的遷移規律，具體錶現為盆地內的逆遲斷裂遷移、沉積沉降中心遷移、斷陷的萎縮與消亡等自北嚮南逐步變新。最後，從闆緣和闆內過程和機製，探討瞭該盆地東部的中生代構造遷移機製，這種構造-沉積-成盆等的嚮盆內變新遷移是中生代以來準噶爾盆地基底嚮西擠齣構造和中生代西伯利亞闆塊嚮南楔入的聯閤效應。
구조천이시분지발전연화과정중십분보편적지질현상，단준갈이분지동부지구상관연구정도교저。본문기우대준갈이분지동부지구소개전적대량지진부면해석，병종합전인연구성과，대준갈이분지동부지구중생대구조천이특정진행료계통토론。준갈이분지동부중신생대기간속우륙내，수서백리아판괴지속향남설입적원정효응，기구조특정총체표현출자북향남적천이규률，구체표현위분지내적역충단렬천이、침적침강중심천이、단함적위축여소망등자북향남축보변신。최후，종판연화판내과정화궤제，탐토료해분지동부적중생대구조천이궤제，저충구조-침적-성분등적향분내변신천이시중생대이래준갈이분지기저향서제출구조화중생대서백리아판괴향남설입적연합효응。
Tectonic migration is a common geological process during basin formation and development. However, little is known about the tectonic migration in the eastern Junggar Basin. This paper focuses on the eastern part of the Junggar Basin to discuss Mesozoic tectonic migration and its mechanism based on our interpretation of seismic profiles and previous structural results in the eastern part of the Junggar Basin. The eastern Junggar Basin was under intraplate setting in Mesozoic-Cenozoic. Under the southward indentation of the Siberian Plate, the tectonic migration was characterized by progressively southward propagating of faulting, sedimentation, depression, termination of faulting in the basin. Finally, this paper discusses the mechanism and processes of Mesozoic tectonic migration from interplate to intraplate. The migration mechanism of the tectonism-sedimentation-basin formation is related to the Mesozoic extrusion tectonics of the basement of the Junggar Basin and the southward indentation of the Mesozoic Siberian Block.
