本文選題：北山地區(qū)　切入點(diǎn)：晚古生代　出處：《沉積學(xué)報(bào)》2017年03期 　論文類(lèi)型：期刊論文

【摘要】：北山地區(qū)位于華北板塊、塔里木板塊和哈薩克斯坦板塊交匯帶,晚古生代構(gòu)造演化倍受關(guān)注且久有爭(zhēng)議,該地區(qū)晚古生代地層的研究對(duì)探討大地構(gòu)造演化具有重要意義。利用同位素定年、沉積相分析、粒度分析和碎屑成分統(tǒng)計(jì)分析方法對(duì)北山地區(qū)早石炭世紅柳園組進(jìn)行研究。在下部火山巖中獲得LA-ICP-MS鋯石U-Pb年齡為359.9±1.4 Ma,參考區(qū)域古生物資料,其形成時(shí)代應(yīng)為早石炭世早期。紅柳園組上部碎屑巖中發(fā)育大量濁流沉積構(gòu)造和典型鮑馬序列,其中砂巖成熟度較低,并且粒度分析結(jié)果顯示具有濁流沉積的粒度特征,這些證據(jù)共同指示紅柳園組為近物源濁流沉積。此外通過(guò)碎屑組分統(tǒng)計(jì)和Qt-F-L、Qm-F-Lt以及Qp-Lv-Ls圖解對(duì)沉積構(gòu)造背景進(jìn)行了探討,發(fā)現(xiàn)研究區(qū)紅柳園組物源主要來(lái)自火山弧,表明其形成的構(gòu)造環(huán)境應(yīng)為與島弧鄰近的沉積盆地。
[Abstract]:The Beishan area is located in the North China plate, the Tarim plate and the Kazakhstan plate. The late Paleozoic tectonic evolution has attracted much attention and has been controversial for a long time. The study of late Paleozoic strata in this area is of great significance for the exploration of tectonic evolution. The early Carboniferous Hongliuyuan formation in Beishan area was studied by particle size analysis and clastic composition statistical analysis. The LA-ICP-MS zircon U-Pb age obtained from the lower volcanic rocks is 359.9 鹵1.4 Ma.The regional paleontological data show that the zircon U-Pb age is 359.9 鹵1.4 Ma. A large number of turbidite sedimentary structures and typical Baoma sequences were developed in the upper clastic rocks of Hongliuyuan formation, in which the sandstone maturity is relatively low, and the granularity analysis results show that it has the characteristics of turbidite sedimentary granularity. These evidences together indicate that the Hongliuyuan formation is a near-provenance turbidite deposition. In addition, the sedimentary tectonic background is discussed by means of clastic component statistics, Qt-F-L Qm-F-Lt and Qp-Lv-Ls diagrams. It is found that the source of Hongliuyuan formation in the study area is mainly from volcanic arc. It indicates that the tectonic environment is a sedimentary basin adjacent to the island arc.
【作者單位】： 河北省區(qū)域地質(zhì)礦產(chǎn)調(diào)查研究所;中國(guó)煤炭地質(zhì)總局水文地質(zhì)局;河北省地礦局第一地質(zhì)大隊(duì);
【基金】：中國(guó)地質(zhì)調(diào)查局項(xiàng)目(12120113056500)~~
【分類(lèi)號(hào)】：P512.2

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