本文選題：四川盆地　切入點(diǎn)：寒武紀(jì)　出處：《地質(zhì)論評(píng)》2017年04期

【摘要】：四川盆地中部晚震旦(埃迪卡拉)世—早寒武世克拉通內(nèi)裂陷與安岳震旦(埃迪卡拉)系—寒武系特大氣田的形成關(guān)系密切,年代學(xué)研究對(duì)認(rèn)識(shí)克拉通內(nèi)裂陷構(gòu)造意義重大。對(duì)四川盆地樂山先鋒剖面燈影組三段火山碎屑巖進(jìn)行鋯石LA-ICP-MS U-Pb定年,研究結(jié)果表明四川盆地?zé)粲敖M三段火山碎屑巖的鋯石U-Pb年齡為(539.6±1.4)Ma,年代學(xué)結(jié)果表明四川盆地?zé)羧闻c燈四段屬于寒武系。基于燈影組底界(551.1 Ma)、含火山碎屑巖的燈三段(539.6 Ma)、含小殼化石的麥地坪組(535.2 Ma)和下寒武統(tǒng)Ni—Mo多金屬硫化物富集層(521.0 Ma)四個(gè)等時(shí)面構(gòu)建了克拉通內(nèi)裂陷演化的時(shí)間框架。在此基礎(chǔ)上認(rèn)為四川盆地中部晚震旦(埃迪卡拉)世—早寒武世隆坳構(gòu)造的形成主要受邊界斷裂控制,斷層活動(dòng)使裂陷內(nèi)水體加深,少量燈四段含硅質(zhì)白云巖沉積后,麥地坪組與筇竹寺組開始沉積,麥地坪組與燈四段的界線在裂陷內(nèi)與裂陷兩側(cè)并不等時(shí),裂陷內(nèi)麥地坪組、筇竹寺組與裂陷兩側(cè)燈影組四段為同期異相沉積。
[Abstract]:The late Sinian (Eddie Carla) -early Cambrian craton rift in the central Sichuan Basin is closely related to the formation of the Anyue Sinian (Eddie Cara) -Cambrian giant gas field. The chronological study is of great significance to the understanding of the tectonic structure of the craton inner rift. Zircon LA-ICP-MS U-Pb dating of volcanic clastic rocks of the third member of the Dengying formation in the Leshan Pioneer profile, Sichuan Basin, is carried out. The results show that the zircon U-Pb age of the third member of the Dengying formation in Sichuan Basin is 539.6 鹵1.4 Ma.The geochronological results show that the third and fourth member of the Dengying formation belong to Cambrian. The time frame for the evolution of the craton inner rift was constructed on the four isochron of the Madiping formation containing small crust fossils and the Ni-Mo polymetallic sulphide enrichment layer of the Lower Cambrian (521.0 Ma). Based on this, it is considered that the late Sinian in the central Sichuan Basin. The formation of the Edikala (early Cambrian) uplift depression was mainly controlled by the boundary faults. The fault activity deepens the water body in the rift. After a small amount of siliceous dolomite deposits in the fourth member, the Madiping formation and Qiongzhusi formation begin to deposit. When the boundary between the Madiping formation and the fourth member of the mai Diping formation is not the same as the two sides of the rift depression, the inner mai diping formation in the rifting is not equal to the two sides of the rift. The fourth member of Qiongzhusi formation and Dengying formation on both sides of the rift are synchronal and heterogeneous deposits.
【作者單位】： 南京大學(xué)內(nèi)生金屬礦床成礦機(jī)制研究國(guó)家重點(diǎn)實(shí)驗(yàn)室;中國(guó)石油勘探開發(fā)研究院廊坊分院;首都師范大學(xué);
【基金】：國(guó)家科技重大專項(xiàng)(編號(hào):2016ZX05003-001、2017ZX05008-001) 國(guó)家自然科學(xué)基金資助項(xiàng)目(編號(hào):41230208)的成果~~
【分類號(hào)】：P597.3;P618.13

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