【摘要】：北淮陽構(gòu)造帶為一條沿大別造山帶北麓展布的狹長構(gòu)造帶,是華北板塊與揚子板塊碰撞造山的產(chǎn)物,其物源組成、構(gòu)造屬性等研究內(nèi)容是揭示南北板塊在中國東部的大地構(gòu)造單元格局以及時空演化的關(guān)鍵信息。結(jié)合構(gòu)造變形、巖石學(xué)、巖石地球化學(xué)、鋯石U-Pb年代學(xué)等方法對北淮陽前中生代巖石地層單元蘇家河群/盧鎮(zhèn)關(guān)群和信陽群/佛子嶺群進行對比分析,就其構(gòu)造屬性形成這樣的基本認識:北淮陽構(gòu)造帶是楊子板塊向華北板塊俯沖-碰撞的結(jié)合帶,其物質(zhì)組成具有雙源性-主體部分來源于楊子板塊,由代表了楊子板塊北緣基底的晚元古代蘇家河群(784±19Ma)/盧鎮(zhèn)關(guān)群(756±12Ma)和楊子板塊被動陸緣復(fù)理石沉積建造-中泥盆世至晚泥盆世早期的信陽群南灣組組成,后者相當(dāng)于商丹縫合帶以南的劉嶺群;信陽群龜山組親緣于華北板塊并構(gòu)成華北板塊南緣的弧前楔形沉積體,是沿商丹縫合帶分布的桃花鋪弧前楔形沉積體的東延。佛子嶺群總體可與信陽群相連,全巖成分顯示,佛子嶺群沉積構(gòu)造環(huán)境既有活動大陸邊緣,又有被動大陸邊緣。由于中生代以來多期構(gòu)造變形疊加(至少三期),佛子嶺群巖石地層單元的疊置關(guān)系被改造或重置,使其缺少"構(gòu)造解體"的證據(jù),而無法在構(gòu)造單元上細分。對于兩大板塊之間的縫合帶位置,筆者認為:商丹縫合帶進入北淮陽構(gòu)造帶后,應(yīng)沿著北淮陽的北界,與龜山-梅山-六安-磨墩水庫一線延伸的斷裂帶相連。
[Abstract]:The northern Huaiyang tectonic belt is a long narrow tectonic belt along the northern foot of the Dabie orogenic belt. It is the product of the collision orogeny of the North China plate and the Yangtze plate. Its source composition and structural properties are the key information of the tectonic units of the north and South plates in eastern China and the key information of spatiotemporal evolution. Lithogeochemistry, zircon U-Pb chronology and other methods have made a comparative analysis of the pre Mesozoic lithostratigraphic units of the Sujia River group / Luzhen Guan group and the Xinyang group / fuchling group in northern Huaiyang. The basic understanding of its structural properties is that the northern Huaiyang tectonic zone is the joint zone of the subduction and collision of the Yang Zi plate to the North plate block. The dual source - main body is derived from the Yang Zi plate, which is composed of the late Proterozoic Sujia River group (784 + 19Ma) / Luzhen Guan group (756 + 12Ma) and the Yang Zi plate passive continental margin sedimentary formation, which represents the northern margin of the Yang Zi plate - the southern Xinyang group of the Middle Devonian to the early Late Devonian group, which is equivalent to Liu Ling in the south of the Shang Dan suture belt. The Xinyang group is closely related to the North China plate and forms a pre arc wedge-shaped sedimentary body in the southern margin of the North China plate. It is the East extension of the wedge-shaped sedimentary body of the peach flower spread along the Shang Dan suture zone. The fqiging group is generally connected with the Xinyang group. The whole rock composition shows that the sedimentary environment of the fqiging group has both active continental margin and passive continent. Due to the superposition of multistage tectonic deformation (at least three periods) since Mesozoic, the stacking relationship of the lithostratigraphic units of the Fuzi Ridge Group is reformed or reset, which makes it lack the evidence of "tectonic disintegration", but can not be subdivided on the tectonic units. For the suture zone between the two plates, the author believes that the Shang Dan suture belt enters the northern Huaiyang tectonic belt. It should be connected along the northern boundary of northern Huaiyang with the fault zone extending along the first line of the Gui Shan Meishan Lu'an moutun reservoir.
【作者單位】： 合肥工業(yè)大學(xué)資源與環(huán)境工程學(xué)院;加拿大滑鐵盧大學(xué);河南省地質(zhì)調(diào)查院;
【基金】：國家自然科學(xué)基金資助項目(編號:41072161、41272222) 中國地質(zhì)調(diào)查局科研項目(編號:121201121114、201201044002)的成果
【分類號】：P542

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